CN110240450A - A kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region - Google Patents
A kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region Download PDFInfo
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- CN110240450A CN110240450A CN201910604294.1A CN201910604294A CN110240450A CN 110240450 A CN110240450 A CN 110240450A CN 201910604294 A CN201910604294 A CN 201910604294A CN 110240450 A CN110240450 A CN 110240450A
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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
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region; it is formed by following raw materials according mixture by weight: 400~480 parts, S75 grades 50~106 parts of ground granulated blast furnace slags of PO52.5 cement, 690~703 parts of river sand, 1089~1107 parts of 5mm~20mm continuous grading limestone gravel, full 45 parts of water pottery sand; 11.0~11.7 parts of high performance water reducing agent of polyocarboxy acid, 160 parts of water.The present invention passes through preferred aggregate, water pottery sand of satisfying and river sand and mixes technology again, reaches tightly packed and generates interior maintenance effect, significantly reduces concrete early-age shrinkage rate and cracking risk；By high performance water reducing agent of polyocarboxy acid optimization blends technology, under conditions of guaranteeing water-reducing rate, the guarantor of concrete collapses the time under the environmental condition that 25~40 DEG C of Scientific Regulation and setting time meets construction requirement；Cement is replaced using certain proportion ground granulated blast furnace slag, improve the workability of concrete under high temperature low moisture environments and reduces the heat of hydration, improves construction operability.
Description
Technical field
The present invention relates to technical field of concrete, in particular to a kind of high cracking resistance lower shrinkage suitable for high temperature River Valley Region
High performance concrete.
Background technique
Concrete usually as primary building material, it has, and easily molded, low energy consumption, durability is good, it is economical and practical and
The advantages of can be made into various support mechanisms in conjunction with steel is the present age most widely used construction material.But in construction time section
Average temperature of the whole year is more than to require concrete to have the same of good application property under 30 DEG C of high temperature low humidity River Valley Region weather conditions
When, also to guarantee that its mechanical property and endurance quality are met the requirements.It is therefore desirable to which concrete has the lower heat of hydration, longer
Presetting period, intensity, anti-contracility energy and cracking resistance must also reach higher standard.
In highway bridge and culvert work progress, strength grade of concrete is high, water consumption is low, gel material content is high, concrete
Viscosity is high, easily causes that concrete pumping resistance is big, dehydration is fast, loss of working performance is larger.And high temperature River Valley Region " collection fuel factor "
More prominent, the pumping construction control difficulty of concrete further increases.How conventional concrete is improved and is allowed to more suitable
It is a urgent problem to be solved for the concrete construction in above-mentioned condition environment.Chinese patent CN108083726A is provided
A kind of concrete formulating method suitable for tropical desert megathermal climate condition, can effectively solve desert area high-impermeable coagulation
The production and construction of soil.But the concrete produced according to Stock allotment right provided by the patent, strength grade are not able to satisfy by force
Degree grade reaches C50 or more.
Summary of the invention
It is an object of the invention to solve the deficiencies in the prior art, provide a kind of strength grade C50 or more is suitable for height
The high cracking resistance lower shrinkage high performance concrete of warm River Valley Region, to be suitable for the concrete construction of high temperature low moisture environments.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region, the concrete is by by weight
Following raw materials according mixture form:
400~480 parts, S75 grades 50~106 parts of ground granulated blast furnace slags of PO52.5 cement, 690~703 parts of river sand,
1089~1107 parts of 5mm~20mm continuous grading limestone gravel, full 45 parts of water pottery sand, high performance water reducing agent of polyocarboxy acid 11.0~
11.7 parts, 160 parts of water.
Further, the high performance water reducing agent of polyocarboxy acid is that a kind of water-reducing rate is big greater than 30%, concrete retarding time
It is compounded in the functional poly carboxylic acid water reducer of 8h, 1h slump free of losses, including following components: high water reduction polycarboxylic acids diminishing
Agent mother liquor 10%, high-slump-retentionpolycarboxylate polycarboxylate water reducer mother liquor 6%, sustained-release polycarboxylic water reducer mother liquor 3%, high workability polycarboxylic acids
Water-reducing agent mother liquor 3%, retarder 3%~5%, methyl cellulose ether 0.1%~0.8%, air entraining agent 0.03%, defoaming agent
0.05%, water is surplus, the mass percent of each component and be 100%, and the solid content of polycarboxylate superplasticizer mother liquor is 50%；Institute
Stating polycarboxylate superplasticizer mother liquor acid ether ratio is 1.9~3.2, weight average molecular mass 35000~45000, side-chain structure HPEG.
Further, the high performance water reducing agent of polyocarboxy acid, when temperature of concrete during construction is 25 DEG C~30 DEG C, slow setting
Agent is made of by mass fraction 1% sodium gluconate and 2% sucrose；When temperature is 30 DEG C~35 DEG C, retarder by quality point by
2% sodium gluconate and 2% sucrose composition；When temperature is 35 DEG C~40 DEG C, retarder by quality point by 2% sodium gluconate and
3% sucrose composition.
Further, the high performance water reducing agent of polyocarboxy acid, when river sand fineness modulus is 2.6~2.7, methylcellulose
The mass fraction of ether is 0.1%~0.5%；When river sand fineness modulus is 2.8~3.0, the mass fraction of methyl cellulose ether is
0.3%~0.8%.
River sand clay content≤2.0% of the present invention, clod content≤0.5%, fineness modulus is 2.6~3.0；It is described
Lime stone in 5mm~20mm continuous grading limestone gravel meets the requirement of 5mm~20mm continuous grading, flat-elongated particles content
≤ 5%, irregular particle content≤10%, continuous grading loosely-packed voidage≤43.0%；The full water pottery sand is will to make pottery
Sand carries out pre- immersion to water absorption rate >=8%.
Compared with prior art, beneficial effects of the present invention are as follows:
First, the present invention is for the weather that the rainfall of high temperature River Valley Region is few, humidity is small, evaporation is big, sunshine is sufficient, temperature is high
Feature develops one kind suitable for high temperature low humidity River Valley Region and uses cracking resistance lower shrinkage high performance concrete, used poly- carboxylic
Sour high-performance water reducing agent can be according to different construction environment temperature and raw material property index adjustment compounding parameter, to meet concrete
While with good application property, mechanical property and durability are also able to satisfy construction requirement.
Second, the present invention provides a kind of strength grades up to C50 or more and is suitable for the high cracking resistance of high temperature River Valley Region
Lower shrinkage high performance concrete preferably and again mixes technology by aggregate, reduces concrete pore rate and moisture evaporation rate, reaches
Effect is conserved in tightly packed and generation, concrete early-age shrinkage rate can be reduced, reduces cracking risk.
Third, concrete provided by the present invention can comprehensively utilize industrial residue in process of production, be granulated by incorporation
The technological means of ground granulated blast furnace slag can reduce cement consumption to a certain extent, reduce the heat of hydration, improve concrete workability, full
Sufficient pumping construction requirement, the green construction for the engineering concrete that can get down the highway for high temperature low moisture environments provide theoretical foundation and reference.
To sum up, the present invention by aggregate preferably, full water pottery sand and river sand mix technology again, reach tightly packed and generate in it is feeding
Effect is protected, concrete early-age shrinkage rate and cracking risk are significantly reduced；Pass through high performance water reducing agent of polyocarboxy acid optimization blends skill
Art, under conditions of guaranteeing water-reducing rate, when the guarantor of concrete collapses the time with condensing under the environmental condition that 25~40 DEG C of Scientific Regulation
Between meet construction requirement；Cement is replaced using certain proportion ground granulated blast furnace slag, improves concrete under high temperature low moisture environments
Workability and the reduction heat of hydration, improve construction operability.
Specific embodiment
In order to keep the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, the present invention is carried out
It is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit
The present invention.
For the specific embodiment of concrete of the invention, the high cracking resistance suitable for high temperature River Valley Region in the present invention is low
The each component and quality proportioning for shrinking high performance concrete generally choose following range: 400~480 parts of PO52.5 cement, S75
50~106 parts of ground granulated blast furnace slag of grade, 690~703 parts of river sand, 5mm~20mm continuous grading limestone gravel 1089~
1107 parts, full 45 parts of water pottery sand, 11.0~11.7 parts of high performance water reducing agent of polyocarboxy acid, 160 parts of water.Specific numerical value dosage is root
It is calculated according to the design method of match ratio.
Macadam gradating can generate certain influence to concrete making technology performance, and in the actual construction process, concreting is logical
Often selection pumping construction.For pump concrete, typical stage is furnished with 5~20mm and two kinds of 5~25m.Rubble is based on following two points
Consider: 5~20mm graded broken stone maximum particle diameter is smaller, is more conducive to improve fresh concrete mobility, convenient in casting process
Middle concrete reaches the working performance requirement of self-compacting concrete；Reinforcing bar binds more intensive, steel in highway bridge and culvert work progress
Muscle spacing is smaller, using the rubble compared with small particle, is conducive to fill reinforcing bar gap when pouring.
Common ordinary portland cement is PO52.5 and two kinds of PO42.5, and difference is using special test side
Method, cement mortar test 28d intensity are respectively greater than 52.5MPa and 42.5MPa, and the present invention can reached using PO52.5 cement
To folk prescription concrete cement dosage is reduced under the premise of same intensity grade, the reduction of cement consumption can reduce slurry viscosity,
Be conducive to the promotion of working performance of concrete.
Ground granulated blast furnace slag is divided into S75 grades and S95 grades, and the main purpose for mixing slag powders is to reduce cement consumption, from
And the heat of hydration of cement is reduced, reduce cracking risk.And because miberal powder has certain activity, maturing will not be because of
The incorporation of miberal powder causes intensity to decline, and is based on mixing proportion design method of the present invention, and Strength surplus amount can make hardening mixed
Solidifying soil intensity reaches 120% or more of design strength grade, therefore comprehensive economy considers, selects lower-cost S75 grades of mine
Powder can meet mix-design requirement.
River sand clay content≤2.0% of the invention, clod content≤0.5%, fineness modulus is 2.6~3.0；The lime
Stone meets the requirement of 5mm~20mm continuous grading, flat-elongated particles content≤5%, irregular particle content≤10%, continuous grading
Loosely-packed voidage≤43.0%；The pottery sand need to be soaked in advance, water absorption rate >=8%.
The high performance water reducing agent of polyocarboxy acid of the present invention is that a kind of water-reducing rate is greater than 30%, concrete retarding time
Compound greater than the functional poly carboxylic acid water reducer of 8h, 1h slump free of losses, including following components: high water reduction polycarboxylic acids subtracts
Aqua mother liquor 10%, high-slump-retentionpolycarboxylate polycarboxylate water reducer mother liquor 6%, sustained-release polycarboxylic water reducer mother liquor 3%, the poly- carboxylic of high workability
Sour water-reducing agent mother liquor 3%, retarder 3%~5%, methyl cellulose ether 0.1%~0.8%, air entraining agent 0.03%, defoaming agent
0.05%, water is surplus, the mass percent of each component and be 100%, and the solid content of polycarboxylate superplasticizer mother liquor is 50%；Institute
Stating polycarboxylate superplasticizer mother liquor acid ether ratio is 1.9~3.2, weight average molecular mass 35000~45000, side-chain structure HPEG.
High performance water reducing agent of polyocarboxy acid of the present invention, when temperature of concrete during construction is 25 DEG C~30 DEG C, retarder
It is made of by mass fraction 1% sodium gluconate and 2% sucrose；When temperature is 30 DEG C~35 DEG C, retarder is by quality point by 2%
Sodium gluconate and 2% sucrose composition；When temperature is 35 DEG C~40 DEG C, retarder is by quality point by 2% sodium gluconate and 3%
Sucrose composition.
High performance water reducing agent of polyocarboxy acid of the present invention, which is characterized in that when river sand fineness modulus is 2.6~2.7, first
The mass fraction of base cellulose ether is 0.1%~0.5%；When river sand fineness modulus is 2.8~3.0, the matter of methyl cellulose ether
Measuring score is 0.3%~0.8%.
Unless otherwise indicated, described in foregoing description and percentage be mass percent.
Various raw materials used in concrete of the present invention are prepared, such as PO52.5 cement, S75 grades of granulated blast-furnace slags
Powder, 5mm~20mm continuous grading limestone gravel, pottery sand, high water reduction polycarboxylic acids mother liquor, high-thin arch dam polycarboxylic acids mother liquor, delays river sand
Solidifying type polycarboxylic acids mother liquor, polyethers air entraining agent, organic silicon defoamer etc. are commercially available, can also voluntarily be prepared according to the prior art.
The Stock allotment right according to different execution conditions propositions, embodiment 1, embodiment 2, embodiment 3, reality is set forth below
The daily temperature for applying example 4 is respectively 25 DEG C, 30 DEG C, 35 DEG C, 40 DEG C, and specific Stock allotment right and concrete performance index be shown in Table 1~
Table 5.Cement, that is, PO52.5 cement, slag powders, that is, S75 grades of ground granulated blast furnace slag, rubble, that is, 5mm~20mm in table 1 is continuous
Gradation limestone gravel.
1 Examples 1 to 4 concrete mix parameter (kg/m of table3)
2 Examples 1 to 4 workability of concrete index of table
3 Examples 1 to 4 mechanical performance of concrete of table
4 Examples 1 to 4 flat tests index of table
5 Examples 1 to 4 early-age shrinkage rate of table
The fresh concrete slump in 210mm or more, holds the time within 5s, and divergence is all larger than 560mm, newly mixes
Concrete workability is preferable, and slump cake center does not occur aggregate packing phenomenon, and edge does not occur slurry precipitation phenomenon；
And working performance of concrete free of losses after 1h.The 28d intensity of concrete reaches 125% or more of design value, intensity and static(al) by
Compression elasticity modulus meets design and construction requirement.Using Examples 1 to 4 Stock allotment right production concrete early-age shrinkage rate compared with
It is small, and concrete anticracking grade can reach III grade.
It is proved by embodiment, the present invention can reduce the shrinking percentage of concrete, improve crack-resistant performance of concrete.The present invention is also
The heat of hydration can be reduced and improve concrete strength, extend the concrete initial set time, improve concrete workability, enhancing construction can
Operability guarantees concrete pouring quality, while reducing cost, enhancing construction operability.
Claims (7)
1. a kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region, which is characterized in that the concrete by
Following raw materials according mixture by weight forms: 400~480 parts, S75 grades ground granulated blast furnace slags 50 of PO52.5 cement~
106 parts, 690~703 parts of river sand, 1089~1107 parts of 5mm~20mm continuous grading limestone gravel, full 45 parts of water pottery sand, gather
11.0~11.7 parts of carboxylic acid high-performance water reducing agent, 160 parts of water.
2. a kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region according to claim 1, special
Sign is, the high performance water reducing agent of polyocarboxy acid is that a kind of water-reducing rate is greater than for 30%, concrete retarding time and is greater than 8h, 1h slump
The functional poly carboxylic acid water reducer of free of losses is spent, including following components compounds: high water reduction polycarboxylate superplasticizer mother liquor 10%,
High-slump-retentionpolycarboxylate polycarboxylate water reducer mother liquor 6%, sustained-release polycarboxylic water reducer mother liquor 3%, high workability polycarboxylate superplasticizer mother liquor
3%, retarder 3%~5%, methyl cellulose ether 0.1%~0.8%, air entraining agent 0.03%, defoaming agent 0.05%, water are remaining
Amount, the mass percent of each component and be 100%, the solid content of polycarboxylate superplasticizer mother liquor is 50%；The polycarboxylic acids diminishing
Agent mother liquor acid ether ratio is 1.9~3.2, weight average molecular mass 35000~45000, side-chain structure HPEG.
3. a kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region according to claim 1 or 2,
It is characterized in that, the high performance water reducing agent of polyocarboxy acid, when temperature of concrete during construction is 25 DEG C~30 DEG C, retarder is by quality point
Number is made of 1% sodium gluconate and 2% sucrose；When temperature is 30 DEG C~35 DEG C, retarder is by quality point by 2% gluconic acid
Sodium and 2% sucrose composition；When temperature is 35 DEG C~40 DEG C, retarder is by quality point by 2% sodium gluconate and 3% sucrose group
At.
4. a kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region according to claim 1 or 2,
It is characterized in that, the high performance water reducing agent of polyocarboxy acid, when river sand fineness modulus is 2.6~2.7, the quality point of methyl cellulose ether
Number is 0.1%~0.5%；When river sand fineness modulus is 2.8~3.0, the mass fraction of methyl cellulose ether is 0.3%~
0.8%.
5. a kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region according to claim 1, special
Sign is that river sand clay content≤2.0%, clod content≤0.5%, fineness modulus is 2.6~3.0.
6. a kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region according to claim 1, special
Sign is that the lime stone in 5mm~20mm continuous grading limestone gravel meets the requirement of 5mm~20mm continuous grading, needle
Sheet-like particle content≤5%, irregular particle content≤10%, continuous grading loosely-packed voidage≤43.0%.
7. a kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region according to claim 1, special
Sign is that the full water pottery sand is that pottery sand is carried out to pre- immersion to water absorption rate >=8%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111116091A (en) * | 2019-12-30 | 2020-05-08 | 四川恒泽建材有限公司 | Compound polycarboxylate superplasticizer and production process thereof |
| CN111675509A (en) * | 2020-05-28 | 2020-09-18 | 安徽省公路桥梁工程有限公司 | High-performance anti-crack concrete and preparation method thereof |
| CN111875313A (en) * | 2020-07-14 | 2020-11-03 | 华润水泥技术研发有限公司 | Preparation method of super early-strength self-compacting concrete applied to PC (polycarbonate) member |
| CN111908852A (en) * | 2020-08-28 | 2020-11-10 | 江苏蓝圈新材料股份有限公司 | Concrete for prefabricated part and preparation method thereof |
| CN112979238A (en) * | 2021-02-08 | 2021-06-18 | 武汉理工大学 | Low-shrinkage high-performance concrete |
| CN113979685A (en) * | 2021-10-12 | 2022-01-28 | 广州大学 | High-temperature-resistant and good-workability concrete and preparation method thereof |
| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111116091A (en) * | 2019-12-30 | 2020-05-08 | 四川恒泽建材有限公司 | Compound polycarboxylate superplasticizer and production process thereof |
| CN111675509A (en) * | 2020-05-28 | 2020-09-18 | 安徽省公路桥梁工程有限公司 | High-performance anti-crack concrete and preparation method thereof |
| CN111875313A (en) * | 2020-07-14 | 2020-11-03 | 华润水泥技术研发有限公司 | Preparation method of super early-strength self-compacting concrete applied to PC (polycarbonate) member |
| CN111875313B (en) * | 2020-07-14 | 2022-06-03 | 华润水泥技术研发有限公司 | Preparation method of super early strength self-compacting concrete applied to PC (polycarbonate) member |
| CN111908852A (en) * | 2020-08-28 | 2020-11-10 | 江苏蓝圈新材料股份有限公司 | Concrete for prefabricated part and preparation method thereof |
| CN112979238A (en) * | 2021-02-08 | 2021-06-18 | 武汉理工大学 | Low-shrinkage high-performance concrete |
| CN113979685A (en) * | 2021-10-12 | 2022-01-28 | 广州大学 | High-temperature-resistant and good-workability concrete and preparation method thereof |
| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
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Application publication date: 20190917 |
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