CN107500653A - For high and cold, high altitude localities cement concrete and preparation method thereof - Google Patents
For high and cold, high altitude localities cement concrete and preparation method thereof Download PDFInfo
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- CN107500653A CN107500653A CN201710814268.2A CN201710814268A CN107500653A CN 107500653 A CN107500653 A CN 107500653A CN 201710814268 A CN201710814268 A CN 201710814268A CN 107500653 A CN107500653 A CN 107500653A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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Abstract
It is used for the invention discloses one kind high and cold, cement concrete of high altitude localities and preparation method thereof, by the cement that mass percent is 25%~40%, 25%~40% river sand, 15%~20% water, 0.4%~0.6% DBSA, 1.2%~2% biogum, 2%~4% early strength agent, 1.8%~2.2% cellulose fibre, 0.8%~1.2% polyethylene glycol, 0.4%~0.6% initiator, 2%~4% stearic acid, 2%~4% aliphatic acid and 0.2%~0.4% potassium permanganate are prepared, the cement concrete can be used in high and cold and high altitude localities, and with early strong, early stage, resistance was split, the characteristics of frost resistance is excellent, preparation method is relatively simple simultaneously.
Description
Technical field
The invention belongs to building material field, is related to a kind of cement concrete and preparation method thereof, and in particular to Yi Zhongyong
In high and cold, high altitude localities cement concrete and preparation method thereof.
Background technology
As deepening continuously for China's strategy to develop western regions is practicable, western infrastructure is just gradually perfect.But due to
Western China natural environment is complicated severe, especially the high and cold high altitude localities such as Qinghai so that in this kind of natural ring in area
Concrete structure under border is easier to destroy compared with other areas.In order that state revenue and expenditure not because concrete structure safety problem with
And it is very necessary to be paid attention to high and cold, high altitude localities Durability of Concrete by heavy losses for service life problem.
High and cold, high altitude localities is compared to general area, sunshine-duration length, day mean temperature difference it is big, can reach 20~30 DEG C, portion
Region-by-region year, positive subzero temperature number of days can reach 180d, cause high and cold, high altitude localities concrete freeze thawing compared with other areas more frequency
It is numerous；And it is high and cold, high altitude localities temperature on average is low, influences hydrated cementitious process, concrete strength development is slow, is subjected at the same time
Frequent Frozen-thawed cycled, it is easier to defect is produced in concrete；Small closing is introduced in concrete by adding air entraining agent
Bubble is the conventional measure for improving concrete antifreezing performance, because high altitude localities air is thin, air pressure is low, causes air entraining agent to draw
Gas ability declines, and introduces that bubble stability is poor, and the loss of mixing time longer air content is more serious, simple addition air entraining agent without
Method is effectively improved concrete antifreezing performance.It can be seen that high and cold, High aititude Durability of Concrete is mainly reflected in anti-freezing property.Before
People's research is mainly started with terms of several：Air-entrained agent and water reducer；Change water-cement ratio, binder materials, doping quantity of fly ash, sand
The indexs such as rate；Other materials is added as the frost resistance for strengthening mutually raising concrete；Improve mix mode, construction method etc., but
It is that effect is not fully up to expectations.
The problems such as high and cold, high altitude localities concrete Service Environment above and the state of the art, need a kind of use of exploitation badly
In the early strong of high altitudes and cold area, early stage, resistance was split, and had the feature concrete of good frost resistance.
The content of the invention
The shortcomings that it is an object of the invention to overcome above-mentioned prior art, there is provided one kind is used for high and cold, high altitude localities
Cement concrete and preparation method thereof, the cement concrete can be used in high and cold and high altitude localities, and with early strong, preceding
The characteristics of phase resistance is split, frost resistance is excellent, while preparation method is relatively simple.
It is of the present invention to be used for high and cold, high altitude localities cement concrete by quality percentage to reach above-mentioned purpose
Number is 25%~40% cement, 25%~40% river sand, 15%~20% water, 0.4%~0.6% detergent alkylate
Sulfonic acid, 1.2%~2% biogum, 2%~4% early strength agent, 1.8%~2.2% cellulose fibre, 0.8%~
1.2% polyethylene glycol, 0.4%~0.6% initiator, 2%~4% stearic acid, 2%~4% aliphatic acid and
0.2%~0.4% potassium permanganate is prepared.
Biogum is mixed by mass percent for 60%~70% xanthans and 30%~40% welan gum.
Initiator by mass percent be 40%~60% benzoyl peroxide and 40%~60% sucrose mixing and
Into.
Cement is the portland cement of 42.5 strength grades or the portland cement of 52.5 strength grades；
The modulus of fineness of river sand is 2.3~2.8.
Early strength agent is mixed by mass percent for 70%~80% sodium nitrate and 20%~30% triethanolamine.
The modulus of elasticity of cellulose fibre is 8~10GPa, and the tensile strength of cellulose fibre is 500~1000MPa, fine
The length of cellulose fiber is 2~3mm, and the draw ratio of cellulose fibre is 130~150；
The relative molecular weight of polyethylene glycol is 1000~1200, and polyethylene glycol is shallow white waxy solid.
Aliphatic acid is the medium chain fatty acid laurate containing 12 carbon atoms, and aliphatic acid is saturated fatty acid, aliphatic acid
Density be 0.8830g/mL, the fusing point of aliphatic acid is 44 DEG C.
Preparation method of the present invention for high and cold, high altitude localities cement concrete comprises the following steps：
1) weigh cement, river sand, water, DBSA, biogum, early strength agent, cellulose fibre, polyethylene glycol,
Initiator, stearic acid, aliphatic acid and potassium permanganate；
2) cellulose fibre, polyethylene glycol and initiator are added sequentially to the heating response kettle that temperature is 70~80 DEG C
In, it is stirred for uniformly, obtaining compound A；
3) stearic acid, aliphatic acid and potassium permanganate are added sequentially in the agitating device that temperature is 110~120 DEG C, stirred
Room temperature is cooled to after mixing uniformly, obtains compound B；
4) dodecyl propane sulfonic acid, biogum, early strength agent and water are mixed evenly, obtain weak solution C；
5) cement, river sand, compound B and weak solution C are mixed evenly, then add compound A while stirring, then
It is stirred for uniformly, obtaining for high and cold, high altitude localities cement concrete.
In step 2), it is 70~80 DEG C that the cellulose fibre, polyethylene glycol and initiator are added sequentially into temperature
In heating response kettle, then 10~15min is stirred with 150r/min rotating speed at ambient pressure, obtain compound A.
Room temperature is cooled to after being stirred in step 3), the concrete operations for obtaining compound B are：At ambient pressure with 200r/min
Rotating speed stirring 10min, be cooled to room temperature, obtain compound B.
The invention has the advantages that：
It is of the present invention to be used for high and cold, high altitude localities cement concrete by cement, river sand, water, detergent alkylate
Sulfonic acid, biogum, early strength agent, cellulose fibre, polyethylene glycol, initiator, stearic acid, aliphatic acid and potassium permanganate are with specific
Method mixes, wherein, dodecyl propane sulfonic acid can introduce the bubble of a large amount of small closings in concrete mixing, due to
In high and cold, high altitude localities climatic environment, bubble RT is short, and the present invention is increased by biogum to cement concrete
It is thick, so as to form the film with certain mechanical strength and elasticity around the bubble of introducing, to increase the surface viscosity of vacuolar membrane, from
And improve the retention ratio of bubble.In addition, forming tridimensional network in inside concrete by cellulose fibre, it is more difficult to bubble
Overflow, so as to discharge frost heave stress caused by Frozen-thawed cycled, while cellulose fibre may also function as the effect that early stage, resistance was split, significantly
The generation of inside concrete micro-crack is reduced, while is acted synergistically with biogum and make it that concrete is more closely knit；Cellulose fibre
It in the presence of initiator, can be reacted with polyethylene glycol, polyethylene glycol interlinkage is adsorbed on the surface of cellulose fibre, from
And obtain it is a kind of there is the fibrous material of temperature adjustment similar to phase-change material, the fibrous material can daytime sunshine it is strong,
Temperature absorbs heat when raising, and own temperature and volume profiles keep constant, discharge heat in night cold subzero temperature, so as to
It is effective to improve because concrete through freeze-thaw test phenomenon caused by particular surroundings.
In addition, stearic acid and aliphatic acid wrap up in the surface for being attached to sand under the catalysis of potassium permanganate, one kind is formed with SiO2
The stable material wrapped up for core, fatty acid molecule, aliphatic acid can be undergone phase transition with the change of temperature, when temperature is high
Heat is absorbed without changing own form, slowly releases temperature in low temperature, the stable material is as concrete fine aggregate
At the same time it can also there is the effect that the cellulose fibre collective effect of polyethylene glycol plays regulation concrete internal temperature with adsorption
With so as to effectively improve the concrete service state that frequently experience Frozen-thawed cycled acts in high and cold, high altitude environment.
In addition, the heat evolution velocity for making concrete by early strength agent is accelerated, concrete is set to form intensity earlier, and then make
Concrete can be earlier confrontation particular surroundings under caused stress, realize early stage resistance split, mixed beneficial in high and cold, high altitude localities
Coagulate the growth of native later strength.Simultaneously because with the quickening of heat evolution velocity, cause internal and external temperature gap big, so as to produce temperature
Stress, so inside concrete produce micro-crack, the present invention in adsorption have polyethylene glycol cellulose fibre and with
SiO2It can be absorbed for core, the stable material for being enclosed with fatty acid molecule partially due to early strength agent by temperature self adjusting
Add and caused heat.
To sum up shown, the present invention is self-regulated by foam stabilizing, early strong, increase concrete density and concrete internal temperature
Synergy, effective improvement is high and cold, high altitude localities concrete through freeze-thaw test phenomenon.
Meanwhile it is described be used for high and cold, high altitude localities cement concrete in preparation process, by adding to each raw material
Hot mixing stirs, and preparation method is relatively simple.
Brief description of the drawings
Fig. 1 is the cracking resistance contrast that comparative example one, embodiment one, embodiment two and embodiment three obtain cement concrete
Result figure.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
Comparative example one
Comparative example one selects portland cement concrete, the portland cement concrete by cement that mass percent is 30%,
21.8% river sand, 40% coarse aggregate, 8% water, 0.1% air entraining agent and 0.1% water reducer.
Embodiment one
It is of the present invention to be used for high and cold, high altitude localities cement concrete, it is characterised in that to be by mass percent
35% cement, 30% river sand, 16% water, 0.6% DBSA, 2% biogum, 4% early strength agent,
2.2% cellulose fibre, 1.2% polyethylene glycol, 0.6% initiator, 4% stearic acid, 4% aliphatic acid and
0.4% potassium permanganate is prepared.
Biogum is mixed by mass percent for 65% xanthans and 35% welan gum.
Initiator is mixed by mass percent for 55% benzoyl peroxide and 45% sucrose.
Cement is the portland cement of 42.5 strength grades；
The modulus of fineness of river sand is 2.5.
Early strength agent is mixed by mass percent for 80% sodium nitrate and 20% triethanolamine.
The modulus of elasticity of cellulose fibre is 10GPa, and the tensile strength of cellulose fibre is 1000MPa, cellulose fibre
Length be 3mm, the draw ratio of cellulose fibre is 150；
The relative molecular weight of polyethylene glycol is 1000, and polyethylene glycol is shallow white waxy solid.
Aliphatic acid is the medium chain fatty acid laurate containing 12 carbon atoms, and aliphatic acid is saturated fatty acid, aliphatic acid
Density be 0.8830g/mL, the fusing point of aliphatic acid is 44 DEG C.
The preparation method for high and cold, high altitude localities cement concrete, comprise the following steps：
1) weigh cement, river sand, water, DBSA, biogum, early strength agent, cellulose fibre, polyethylene glycol,
Initiator, stearic acid, aliphatic acid and potassium permanganate；
2) cellulose fibre, polyethylene glycol and initiator are added sequentially in the heating response kettle that temperature is 70 DEG C, then
Stir, obtain compound A；
3) stearic acid, aliphatic acid and potassium permanganate are added sequentially in the agitating device that temperature is 110 DEG C, stirred
After be cooled to room temperature, obtain compound B；
4) dodecyl propane sulfonic acid, biogum, early strength agent and water are mixed evenly, obtain weak solution C；
5) cement, river sand, compound B and weak solution C are mixed evenly, then add compound A while stirring, then
It is stirred for uniformly, obtaining for high and cold, high altitude localities cement concrete.
In step 2), the cellulose fibre, polyethylene glycol and initiator are added sequentially to the heating that temperature is 70 DEG C
In reactor, then 15min is stirred with 150r/min rotating speed at ambient pressure, obtain compound A.
Room temperature is cooled to after being stirred in step 3), the concrete operations for obtaining compound B are：At ambient pressure with 200r/min
Rotating speed stirring 10min, be cooled to room temperature, obtain compound B.
Embodiment two
It is of the present invention for high and cold, high altitude localities cement concrete by mass percent be 39% cement,
30% river sand, 15% water, 0.4% DBSA, 1.2% biogum, 3% early strength agent, 1.8% fibre
Cellulose fiber, 0.8% polyethylene glycol, 0.4% initiator, 4% stearic acid, 4% aliphatic acid and 0.4% Gao Meng
Sour potassium is prepared.
Biogum is mixed by mass percent for 60% xanthans and 40% welan gum.
Initiator is mixed by mass percent for 55% benzoyl peroxide and 45% sucrose.
Cement is the portland cement of 52.5 strength grades；
The modulus of fineness of river sand is 2.5.
Early strength agent is mixed by mass percent for 70% sodium nitrate and 30% triethanolamine.
The modulus of elasticity of cellulose fibre is 8GPa, and the tensile strength of cellulose fibre is 500MPa, cellulose fibre
Length is 2mm, and the draw ratio of cellulose fibre is 130；
The relative molecular weight of polyethylene glycol is 1200, and polyethylene glycol is shallow white waxy solid.
Aliphatic acid is the medium chain fatty acid laurate containing 12 carbon atoms, and aliphatic acid is saturated fatty acid, aliphatic acid
Density be 0.8830g/mL, the fusing point of aliphatic acid is 44 DEG C.
The described preparation method for high and cold, high altitude localities cement concrete comprises the following steps：
1) weigh cement, river sand, water, DBSA, biogum, early strength agent, cellulose fibre, polyethylene glycol,
Initiator, stearic acid, aliphatic acid and potassium permanganate；
2) cellulose fibre, polyethylene glycol and initiator are added sequentially in the heating response kettle that temperature is 80 DEG C, then
Stir, obtain compound A；
3) stearic acid, aliphatic acid and potassium permanganate are added sequentially in the agitating device that temperature is 120 DEG C, stirred
After be cooled to room temperature, obtain compound B；
4) dodecyl propane sulfonic acid, biogum, early strength agent and water are mixed evenly, obtain weak solution C；
5) cement, river sand, compound B and weak solution C are mixed evenly, then add compound A while stirring, then
It is stirred for uniformly, obtaining for high and cold, high altitude localities cement concrete.
In step 2), the cellulose fibre, polyethylene glycol and initiator are added sequentially to the heating that temperature is 80 DEG C
In reactor, then 10min is stirred with 150r/min rotating speed at ambient pressure, obtain compound A.
Room temperature is cooled to after being stirred in step 3), the concrete operations for obtaining compound B are：At ambient pressure with 200r/min
Rotating speed stirring 10min, be cooled to room temperature, obtain compound B.
Embodiment three
It is of the present invention for high and cold, high altitude localities cement concrete by mass percent be 40% cement,
30% river sand, 15% water, 0.4% DBSA, 1.2% biogum, 3% early strength agent, 2.2% fibre
Cellulose fiber, 1.2% polyethylene glycol, 0.6% initiator, 3% stearic acid, 3% aliphatic acid and 0.4% Gao Meng
Sour potassium is prepared.
Biogum is mixed by mass percent for 60% xanthans and 40% welan gum.
Initiator is mixed by mass percent for 60% benzoyl peroxide and 40% sucrose.
Cement is the portland cement of 42.5 strength grades or the portland cement of 52.5 strength grades；
The modulus of fineness of river sand is 2.5.
Early strength agent is mixed by mass percent for 75% sodium nitrate and 25% triethanolamine.
The modulus of elasticity of cellulose fibre is 9GPa, and the tensile strength of cellulose fibre is 800MPa, cellulose fibre
Length is 25mm, and the draw ratio of cellulose fibre is 140；
The relative molecular weight of polyethylene glycol is 1100, and polyethylene glycol is shallow white waxy solid.
Aliphatic acid is the medium chain fatty acid laurate containing 12 carbon atoms, and aliphatic acid is saturated fatty acid, aliphatic acid
Density be 0.8830g/mL, the fusing point of aliphatic acid is 44 DEG C.
Preparation method of the present invention for high and cold, high altitude localities cement concrete comprises the following steps：
1) weigh cement, river sand, water, DBSA, biogum, early strength agent, cellulose fibre, polyethylene glycol,
Initiator, stearic acid, aliphatic acid and potassium permanganate；
2) cellulose fibre, polyethylene glycol and initiator are added sequentially in the heating response kettle that temperature is 75 DEG C, then
Stir, obtain compound A；
3) stearic acid, aliphatic acid and potassium permanganate are added sequentially in the agitating device that temperature is 115 DEG C, stirred
After be cooled to room temperature, obtain compound B；
4) dodecyl propane sulfonic acid, biogum, early strength agent and water are mixed evenly, obtain weak solution C；
5) cement, river sand, compound B and weak solution C are mixed evenly, then add compound A while stirring, then
It is stirred for uniformly, obtaining for high and cold, high altitude localities cement concrete.
In step 2), the cellulose fibre, polyethylene glycol and initiator are added sequentially to the heating that temperature is 75 DEG C
In reactor, then 13min is stirred with 150r/min rotating speed at ambient pressure, obtain compound A.
Room temperature is cooled to after being stirred in step 3), the concrete operations for obtaining compound B are：At ambient pressure with 200r/min
Rotating speed stirring 10min, be cooled to room temperature, obtain compound B.
The cement concrete obtained respectively to comparative example one, embodiment one, embodiment two and embodiment three carries out freeze thawing and followed
Ring test, specific test method reference《Concrete for hydraulic structure testing regulations》(DL/T5150-2001) perform, temperature is put into after shaping
It is 10 ± 2 DEG C, conserved in the low pressure curing box that air pressure is 60kPa to 28d ages, obtains test parameters as shown in table 1 and table 2.
The cement concrete obtained using ring method testing example one, embodiment two, embodiment three and comparative example one
Cracking resistance, due to concrete, the crack time occur more very long, in order to accelerate crack occur, by embodiment one, embodiment two,
Coarse aggregate in embodiment three and comparative example removes, and suitably adjusts water reducer, replaces mixing with the good cement mortar of character is prepared
Solidifying soil, cracking resistance test result are shown in Fig. 1.
Table 1
Table 2
From table 1 with table 2 as can be seen that cement concrete of the present invention is undergoing after being conserved under hypobaric
300 dynamics modulus of elasticity of Frozen-thawed cycled and quality are all lost smaller, and relative dynamic elastic modulus may remain in 90% or so, quality
Loss is 1% or so.And add the normal concrete of the air entraining agent and water reducer relative dynamic elasticity after 300 Frozen-thawed cycleds are undergone
Modulus drops to 60% or so, and mass loss equivalent to function is lost completely, is such as continuing with close to 5%, then has very big peace
Full hidden danger.It will be seen from figure 1 that the present invention does not ftracture yet in 55d, steel loop induced strains are very low always, illustrate that the present invention has
Excellent cracking resistance, high and cold, high altitude localities particular surroundings and weather being adapted to, anti-freezing property is good, to sum up shown,
The ability for bearing various complex stresses under adverse circumstances of cement concrete of the present invention is higher, the maintenance cost in later stage compared with
Low, the durability and safety coefficient of concrete structure are higher, and the infrastructure to the western particular surroundings of country has realistic meaning.
Example IV
It is of the present invention for high and cold, high altitude localities cement concrete by mass percent be 40% cement,
30% river sand, 15% water, 0.4% DBSA, 1.2% biogum, 3% early strength agent, 2.2% fibre
Cellulose fiber, 1.2% polyethylene glycol, 0.6% initiator, 3% stearic acid, 3% aliphatic acid and 0.4% Gao Meng
Sour potassium is prepared.
Biogum is mixed by mass percent for 62% xanthans and 38% welan gum.
Initiator is mixed by mass percent for 55% benzoyl peroxide and 45% sucrose.
Cement is the portland cement of 42.5 strength grades；
The modulus of fineness of river sand is 2.5.
Early strength agent is mixed by mass percent for 72% sodium nitrate and 28% triethanolamine.
The modulus of elasticity of cellulose fibre is 8.5GPa, and the tensile strength of cellulose fibre is 700MPa, cellulose fibre
Length be 2.25mm, the draw ratio of cellulose fibre is 135；
The relative molecular weight of polyethylene glycol is 1150, and polyethylene glycol is shallow white waxy solid.
Aliphatic acid is the medium chain fatty acid laurate containing 12 carbon atoms, and aliphatic acid is saturated fatty acid, aliphatic acid
Density be 0.8830g/mL, the fusing point of aliphatic acid is 44 DEG C.
The described preparation method for high and cold, high altitude localities cement concrete comprises the following steps：
1) weigh cement, river sand, water, DBSA, biogum, early strength agent, cellulose fibre, polyethylene glycol,
Initiator, stearic acid, aliphatic acid and potassium permanganate；
2) cellulose fibre, polyethylene glycol and initiator are added sequentially in the heating response kettle that temperature is 72 DEG C, then
Stir, obtain compound A；
3) stearic acid, aliphatic acid and potassium permanganate are added sequentially in the agitating device that temperature is 118 DEG C, stirred
After be cooled to room temperature, obtain compound B；
4) dodecyl propane sulfonic acid, biogum, early strength agent and water are mixed evenly, obtain weak solution C；
5) cement, river sand, compound B and weak solution C are mixed evenly, then add compound A while stirring, then
It is stirred for uniformly, obtaining for high and cold, high altitude localities cement concrete.
In step 2), the cellulose fibre, polyethylene glycol and initiator are added sequentially to the heating that temperature is 72 DEG C
In reactor, then 14min is stirred with 150r/min rotating speed at ambient pressure, obtain compound A.
Room temperature is cooled to after being stirred in step 3), the concrete operations for obtaining compound B are：At ambient pressure with 200r/min
Rotating speed stirring 10min, be cooled to room temperature, obtain compound B.
Embodiment five
It is of the present invention for high and cold, high altitude localities cement concrete by mass percent be 28.3% water
Mud, 40% river sand, 20% water, 0.5% DBSA, 1.5% biogum, 2% early strength agent, 2%
Cellulose fibre, 1% polyethylene glycol, 0.5% initiator, 2% stearic acid, 2% aliphatic acid and 0.2% Gao Meng
Sour potassium is prepared.
Biogum is mixed by mass percent for 68% xanthans and 32% welan gum.
Initiator is mixed by mass percent for 45% benzoyl peroxide and 55% sucrose.
Cement is the portland cement of 52.5 strength grades；
The modulus of fineness of river sand is 2.7.
Early strength agent is mixed by mass percent for 77% sodium nitrate and 23% triethanolamine.
The modulus of elasticity of cellulose fibre is 9GPa, and the tensile strength of cellulose fibre is 800MPa, cellulose fibre
Length is 2.5mm, and the draw ratio of cellulose fibre is 145；
The relative molecular weight of polyethylene glycol is 1050, and polyethylene glycol is shallow white waxy solid.
Aliphatic acid is the medium chain fatty acid laurate containing 12 carbon atoms, and aliphatic acid is saturated fatty acid, aliphatic acid
Density be 0.8830g/mL, the fusing point of aliphatic acid is 44 DEG C.
The described preparation method for high and cold, high altitude localities cement concrete comprises the following steps：
1) weigh cement, river sand, water, DBSA, biogum, early strength agent, cellulose fibre, polyethylene glycol,
Initiator, stearic acid, aliphatic acid and potassium permanganate；
2) cellulose fibre, polyethylene glycol and initiator are added sequentially in the heating response kettle that temperature is 78 DEG C, then
Stir, obtain compound A；
3) stearic acid, aliphatic acid and potassium permanganate are added sequentially in the agitating device that temperature is 118 DEG C, stirred
After be cooled to room temperature, obtain compound B；
4) dodecyl propane sulfonic acid, biogum, early strength agent and water are mixed evenly, obtain weak solution C；
5) cement, river sand, compound B and weak solution C are mixed evenly, then add compound A while stirring, then
It is stirred for uniformly, obtaining for high and cold, high altitude localities cement concrete.
In step 2), the cellulose fibre, polyethylene glycol and initiator are added sequentially to the heating that temperature is 78 DEG C
In reactor, then 13min is stirred with 150r/min rotating speed at ambient pressure, obtain compound A.
Room temperature is cooled to after being stirred in step 3), the concrete operations for obtaining compound B are：At ambient pressure with 200r/min
Rotating speed stirring 10min, be cooled to room temperature, obtain compound B.
Embodiment six
It is of the present invention for high and cold, high altitude localities cement concrete by mass percent be 25% cement,
40% river sand, 16.9% water, 0.6% DBSA, 1.5% biogum, 4% early strength agent, 2% fibre
Cellulose fiber, 1.2% polyethylene glycol, 0.5% initiator, 4% stearic acid, 4% aliphatic acid and 0.3% Gao Meng
Sour potassium is prepared.
Biogum is mixed by mass percent for 60% xanthans and 40% welan gum.
Initiator is mixed by mass percent for 40% benzoyl peroxide and 60% sucrose.
Cement is the portland cement of 52.5 strength grades；
The modulus of fineness of river sand is 2.7.
Early strength agent is mixed by mass percent for 76% sodium nitrate and 24% triethanolamine.
The modulus of elasticity of cellulose fibre is 8.5GPa, and the tensile strength of cellulose fibre is 600MPa, cellulose fibre
Length be 2.2mm, the draw ratio of cellulose fibre is 135；
The relative molecular weight of polyethylene glycol is 1180, and polyethylene glycol is shallow white waxy solid.
Aliphatic acid is the medium chain fatty acid laurate containing 12 carbon atoms, and aliphatic acid is saturated fatty acid, aliphatic acid
Density be 0.8830g/mL, the fusing point of aliphatic acid is 44 DEG C.
The described preparation method for high and cold, high altitude localities cement concrete comprises the following steps：
1) weigh cement, river sand, water, DBSA, biogum, early strength agent, cellulose fibre, polyethylene glycol,
Initiator, stearic acid, aliphatic acid and potassium permanganate；
2) cellulose fibre, polyethylene glycol and initiator are added sequentially in the heating response kettle that temperature is 72 DEG C, then
Stir, obtain compound A；
3) stearic acid, aliphatic acid and potassium permanganate are added sequentially in the agitating device that temperature is 110 DEG C, stirred
After be cooled to room temperature, obtain compound B；
4) dodecyl propane sulfonic acid, biogum, early strength agent and water are mixed evenly, obtain weak solution C；
5) cement, river sand, compound B and weak solution C are mixed evenly, then add compound A while stirring, then
It is stirred for uniformly, obtaining for high and cold, high altitude localities cement concrete.
In step 2), the cellulose fibre, polyethylene glycol and initiator are added sequentially to the heating that temperature is 72 DEG C
In reactor, then 12min is stirred with 150r/min rotating speed at ambient pressure, obtain compound A.
Room temperature is cooled to after being stirred in step 3), the concrete operations for obtaining compound B are：At ambient pressure with 200r/min
Rotating speed stirring 10min, be cooled to room temperature, obtain compound B.
Embodiment seven
It is of the present invention for high and cold, high altitude localities cement concrete by mass percent be 40% cement,
25% river sand, 16.9% water, 0.5% DBSA, 1.6% biogum, 4% early strength agent, 2% fibre
Cellulose fiber, 1.2% polyethylene glycol, 0.5% initiator, 4% stearic acid, 4% aliphatic acid and 0.3% Gao Meng
Sour potassium is prepared.
Biogum is mixed by mass percent for 70% xanthans and 30% welan gum.
Initiator is mixed by mass percent for 40% benzoyl peroxide and 60% sucrose.
Cement is the portland cement of 52.5 strength grades；
The modulus of fineness of river sand is 2.8.
Early strength agent is mixed by mass percent for 70% sodium nitrate and 30% triethanolamine.
The modulus of elasticity of cellulose fibre is 10GPa, and the tensile strength of cellulose fibre is 1000MPa, cellulose fibre
Length be 3mm, the draw ratio of cellulose fibre is 150；
The relative molecular weight of polyethylene glycol is 1200, and polyethylene glycol is shallow white waxy solid.
Aliphatic acid is the medium chain fatty acid laurate containing 12 carbon atoms, and aliphatic acid is saturated fatty acid, aliphatic acid
Density be 0.8830g/mL, the fusing point of aliphatic acid is 44 DEG C.
The described preparation method for high and cold, high altitude localities cement concrete comprises the following steps：
1) weigh cement, river sand, water, DBSA, biogum, early strength agent, cellulose fibre, polyethylene glycol,
Initiator, stearic acid, aliphatic acid and potassium permanganate；
2) cellulose fibre, polyethylene glycol and initiator are added sequentially in the heating response kettle that temperature is 80 DEG C, then
Stir, obtain compound A；
3) stearic acid, aliphatic acid and potassium permanganate are added sequentially in the agitating device that temperature is 120 DEG C, stirred
After be cooled to room temperature, obtain compound B；
4) dodecyl propane sulfonic acid, biogum, early strength agent and water are mixed evenly, obtain weak solution C；
5) cement, river sand, compound B and weak solution C are mixed evenly, then add compound A while stirring, then
It is stirred for uniformly, obtaining for high and cold, high altitude localities cement concrete.
In step 2), the cellulose fibre, polyethylene glycol and initiator are added sequentially to the heating that temperature is 80 DEG C
In reactor, then 15min is stirred with 150r/min rotating speed at ambient pressure, obtain compound A.
Room temperature is cooled to after being stirred in step 3), the concrete operations for obtaining compound B are：At ambient pressure with 200r/min
Rotating speed stirring 10min, be cooled to room temperature, obtain compound B.
Claims (10)
1. a kind of be used for high and cold, high altitude localities cement concrete, it is characterised in that by mass percent be 25%~40%
Cement, 25%~40% river sand, 15%~20% water, 0.4%~0.6% DBSA, 1.2%~
2% biogum, 2%~4% early strength agent, 1.8%~2.2% cellulose fibre, 0.8%~1.2% polyethylene glycol,
0.4%~0.6% initiator, 2%~4% stearic acid, 2%~4% aliphatic acid and 0.2%~0.4% Gao Meng
Sour potassium is prepared.
2. according to claim 1 be used for high and cold, high altitude localities cement concrete, it is characterised in that biogum by
Mass percent is that 60%~70% xanthans and 30%~40% welan gum mix.
3. according to claim 1 be used for high and cold, high altitude localities cement concrete, it is characterised in that initiator by
Mass percent is that 40%~60% benzoyl peroxide and 40%~60% sucrose mix.
4. according to claim 1 be used for high and cold, high altitude localities cement concrete, it is characterised in that cement is
The portland cement of the portland cement of 42.5 strength grades or 52.5 strength grades；
The modulus of fineness of river sand is 2.3~2.8.
5. according to claim 1 be used for high and cold, high altitude localities cement concrete, it is characterised in that early strength agent by
Mass percent is that 70%~80% sodium nitrate and 20%~30% triethanolamine mix.
6. according to claim 1 be used for high and cold, high altitude localities cement concrete, it is characterised in that cellulose fiber
The modulus of elasticity of dimension is 8~10GPa, and the tensile strength of cellulose fibre is 500~1000MPa, and the length of cellulose fibre is 2
~3mm, the draw ratio of cellulose fibre is 130~150；
The relative molecular weight of polyethylene glycol is 1000~1200, and polyethylene glycol is shallow white waxy solid.
7. according to claim 1 be used for high and cold, high altitude localities cement concrete, it is characterised in that aliphatic acid is
Medium chain fatty acid laurate containing 12 carbon atoms, and aliphatic acid is saturated fatty acid, the density of aliphatic acid is 0.8830g/
ML, the fusing point of aliphatic acid is 44 DEG C.
8. the preparation method for high and cold, high altitude localities cement concrete described in a kind of claim 1, its feature exist
In comprising the following steps：
1) cement, river sand, water, DBSA, biogum, early strength agent, cellulose fibre, polyethylene glycol, initiation are weighed
Agent, stearic acid, aliphatic acid and potassium permanganate；
2) cellulose fibre, polyethylene glycol and initiator are added sequentially in the heating response kettle that temperature is 70~80 DEG C, then
Stir, obtain compound A；
3) stearic acid, aliphatic acid and potassium permanganate are added sequentially in the agitating device that temperature is 110~120 DEG C, stirring is equal
Room temperature is cooled to after even, obtains compound B；
4) dodecyl propane sulfonic acid, biogum, early strength agent and water are mixed evenly, obtain weak solution C；
5) cement, river sand, compound B and weak solution C are mixed evenly, then add compound A while stirring, then stirred again
Mix uniformly, obtain for high and cold, high altitude localities cement concrete.
9. the preparation method according to claim 8 for high and cold, high altitude localities cement concrete, its feature exists
In, in step 2), by the cellulose fibre, polyethylene glycol and initiator be added sequentially to temperature be 70~80 DEG C heating it is anti-
Answer in kettle, then 10~15min is stirred with 150r/min rotating speed at ambient pressure, obtain compound A.
10. the preparation method according to claim 1 for high and cold, high altitude localities cement concrete, its feature exists
In being cooled to room temperature after being stirred in step 3), the concrete operations for obtaining compound B are：Turned at ambient pressure with 200r/min
Speed stirring 10min, is cooled to room temperature, obtains compound B.
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| CN116715482A (en) * | 2023-05-29 | 2023-09-08 | 中建商品混凝土有限公司 | Large-volume concrete based on construction waste and preparation method thereof |
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