CN111205005A - Cementing material, application and concrete - Google Patents
Cementing material, application and concrete Download PDFInfo
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- CN111205005A CN111205005A CN202010152183.4A CN202010152183A CN111205005A CN 111205005 A CN111205005 A CN 111205005A CN 202010152183 A CN202010152183 A CN 202010152183A CN 111205005 A CN111205005 A CN 111205005A
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- cementing material
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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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
-
- 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a cementing material, application and concrete. The cementing material comprises industrial solid waste containing aluminosilicate and an alkali activator in a mass ratio of 4.0-5.0: 1.85-2.8. The cementing material provided by the invention does not need high-temperature sintering, has simple preparation process, does not need to consume natural raw material resources, is prepared by utilizing solid waste raw materials, saves energy and reduces environmental pollution. The cementing material provided by the invention has good mechanical properties.
Description
Technical Field
The invention relates to the field of highway engineering construction, in particular to a cementing material, application and concrete.
Background
At present, the repairing materials are mainly divided into organic materials, inorganic materials and organic-inorganic composite materials, and have the problems of a plurality of defects:
(1) organic repair materials:
the cost is high, the repair period is short, the environment is not protected, and the method is not suitable for large-area popularization.
(2) Organic-inorganic composite material:
the cost is high, the construction is inconvenient, the environment protection is not facilitated, and the method is not suitable for large-area popularization.
(3) Inorganic repair material:
the inorganic repairing material is mainly cement-based inorganic cementing material. In the aspect of mechanical property, the early strength is low, the traffic recovery period is long, and the later strength shrinkage condition is easy to occur after a large amount of additives are utilized; the bonding strength with the old concrete is low, and new cracks are easily generated at the new and old concrete after the repair; the product is hard and brittle and has low breaking strength. From the aspects of environmental protection and energy consumption, along with the rapid development of the construction of the traffic infrastructure in China, the demand of raw materials such as cement and the like is increased greatly. China is a cement producing country, serious pollution to the atmosphere is caused by high-temperature sintering and greenhouse gas emission in cement production for a long time, and a large amount of natural resources are consumed. At present, the composite mineral admixture rapid repair material prepared by using industrial waste materials still has the following defects: firstly, the utilization ratio of industrial waste is low, about 10-20%, and the utilization ratio of industrial waste is low by mainly utilizing the filling effect of micro aggregate; secondly, the chemical reaction principle of the mineral admixture is different, and the mineral admixture utilizes the volcanic ash effect-SiO2、Al2O3Silicate glass, Ca (OH) produced by hydration with cement2Secondary hydration reaction occurs to generate hydrated calcium silicate and other gels to increase the strength of the cementing material, but the mechanical property of the cementing material still needs to be improved.
Therefore, in order to overcome the above disadvantages of cement-based inorganic cementing materials, there is a need to develop a green and environmentally friendly cementing material with excellent mechanical properties.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
An object of the present invention is to provide a cementitious material which has excellent mechanical properties while not consuming natural resources and is environmentally friendly.
It is an object of the present invention to provide a use of a cementitious material.
It is an object of the present invention to provide a use of a cementitious material in concrete and/or mortar.
It is yet another object of the present invention to provide a concrete.
To achieve these objects and other advantages in accordance with the present invention, a cementitious material is provided comprising aluminosilicate containing industrial solid waste and an alkali activator in a mass ratio of 4.0-5.0: 1.85-2.8.
Preferably, the aluminosilicate-containing industrial solid waste in the cementitious material comprises fly ash and slag.
Preferably, in the cement, the alkali activator includes an alkali metal silicate and an alkali metal hydroxide.
Preferably, in the cement, the alkali metal silicate is Na2SiO3An aqueous solution.
Preferably, in the cement, the alkali metal hydroxide comprises NaOH.
Preferably, the cementing material is prepared from fly ash, slag and Na in a mass ratio of 0.9-2.2: 1.8-4.0: 1.6-1.8: 0.27-0.32: 0-0.32SiO3Aqueous solution, NaOH and Ca (OH)2Wherein said Na2SiO3The aqueous solution had a solid content of 34.5% and Na2SiO3The modulus of the alkali activator composed of the aqueous solution and NaOH is 1.2-1.4.
The invention also provides application of the cementing material.
The cementing material is applied to concrete or mortar.
The invention also provides concrete prepared from the cementing material.
The invention at least comprises the following beneficial effects:
(1) the cementing material provided by the invention does not need high-temperature sintering, has simple preparation process, does not need to consume natural raw material resources, is prepared by utilizing solid waste raw materials, saves energy and reduces environmental pollution.
(2) Compared with the existing cement-based inorganic material, the cementing material provided by the invention has good mechanical properties. The setting time of mortar and concrete prepared by the cementing material provided by the invention can be completely regulated and controlled, and the compressive strength and the flexural strength are excellent.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is described in further detail below to enable those skilled in the art to practice the invention with reference to the description.
The invention provides a cementing material which comprises aluminosilicate-containing industrial solid waste and an alkali activator in a mass ratio of 4.0-5.0: 1.85-2.8.
The invention utilizes the aluminosilicate-containing solid waste and the alkali activator to prepare the gelled material, wherein the content of the aluminosilicate-rich solid waste is greatly improved compared with the prior art. During the use process of the cementing material, the aluminum-rich silicate solid waste is subjected to phase reconstruction (i.e. depolymerization to polycondensation). Firstly, aluminosilicate mineral raw material is dissolved in alkali activator, and then the surface of dissolved monomer solid particles diffuses towards the particle gaps to form Mn { - (SiO)2)z-AlO2}n·wH2O, then the alkali silicate solution and the aluminosilicate raw material are subjected to polymerization reaction under the further action of alkali, and finally the gel phase gradually removes residual moisture and is solidified to form a three-dimensional network structure with amorphous polyaluminium-oxygen-silicate. The three-dimensional network structure enables the cementing material to show excellent mechanical properties, thermal stability and durability.
The initial setting time of the cementing material provided by the invention is more than 20min, and the final setting time is less than 60 min. The setting time of the cementing material can be completely regulated and controlled by adjusting the proportion of each component. The flexural strength of the mortar prepared by the cementing material can reach 5.7MPa in 28 days, the compressive strength can reach 58.5MPa, the flexural strength of the concrete can reach 8.0MPa in 28 days, and the compressive strength can reach 63 MPa. The folding ratio is 0.10 to 0.15.
Moreover, the aluminosilicate-rich material is selected from industrial solid waste materials, high-temperature sintering is not needed, the preparation process is simple, natural raw material resources are not needed to be consumed, energy is saved, and environmental pollution is reduced.
In a preferred embodiment, the aluminosilicate containing industrial solid waste comprises fly ash and slag in the cementitious material.
In a preferred embodiment, the alkali activator comprises an alkali silicate and an alkali hydroxide in the cement.
In a preferred embodiment, in the cement, the alkali silicate is Na2SiO3Aqueous solution (water glass).
In a preferred embodiment, the alkali metal hydroxide in the cementitious material comprises NaOH.
In a preferred embodiment, the cementing material is prepared from fly ash, slag and Na in a mass ratio of 0.9-2.2: 1.8-4.0: 1.6-1.8: 0.27-0.32: 0-0.32SiO3Aqueous solution, NaOH and Ca (OH)2Composition of, wherein, Na2SiO3The aqueous solution had a solid content of 34.5% and Na2SiO3The modulus of the alkali activator composed of the aqueous solution and NaOH is 1.2-1.4.
The invention also provides application of the cementing material. The cementing material is prepared on site before application, and the concrete preparation process comprises the following steps: mixing fly ash, slag, Ca (OH)2Sieving, mixing with Na2SiO3Preparing the aqueous solution and NaOH into aqueous solution according to a proportion, and adding the aqueous solution and NaOH into the glue material to be fully stirred. Wherein, the fly ash, the slag and the Na2SiO3NaOH and Ca (OH)2The mass ratio of (A) to (B) is 0.9 to 2.2: 1.8-4.0: 1.6-1.8: 0.27-0.32: 0-0.3. The amount of water can be adjusted according to actual conditions. The preparation process is simple, and the preparation process is carried out at normal temperature without high-temperature sintering.
Preferably, in the cementing material provided by the invention, the slag needs to meet the regulation in GB/T203-2008, and the mass coefficient is preferably more than 1.2. The fly ash is selected from low-calcium fly ash and SiO2、Al2O3The content of (B) is preferably more than 80%. The fly ash is sieved by a 200-mesh sieve. The compound activator is specifically composed of Na2SiO3The water solution and NaOH, and the modulus is 1.2-1.4.
The invention also provides application of the cementing material in concrete or mortar. The cementing material can be used for preparing concrete or mortar, sand and gravels can be further added into the cementing material according to engineering requirements, the gradation of the gravels meets the requirement of continuous gradation, the maximum grain diameter does not exceed 25mm, and coarse aggregates with corresponding grain diameters can also be adopted according to specific construction application. Preferably, when the mortar or concrete prepared by the cementing material provided by the invention is adopted, the fineness modulus of the adopted sand is 2.3-3.0, the mud content is less than 3.0%, and the coarse aggregate is in continuous gradation, so that the mortar or concrete meets the corresponding technical requirements. Sand ratio of concrete: 36 to 40 percent.
The invention also provides concrete prepared from the cementing material. Specifically, the material comprises 0.9-2.2: 1.8-4.0 mass ratio of 1.6-1.8: 0.27-0.32: 0-0.3 of fly ash, slag and Na2SiO3Aqueous solution, NaOH and Ca (OH)2When the concrete is formed, the water-to-glue ratio of the concrete is 0.3-0.4.
Example one
Table 1 shows the mass ratio of each component in the cement and the mass ratio of sand added when the strength mechanical property test was performed in this example.
TABLE 1
Example two
Table 2 shows the mass ratio of each component in the cement and the mass ratio of sand added when the strength mechanical property test was performed in this example.
TABLE 2
| Cementitious material composition | |
| Fly ash (when outer ash passes through 200 mesh sieve) | 2.2 |
| Na2SiO3Aqueous solution (n ═ 3.36) | 1.8 |
| Slag of mine | 2.0 |
| NaOH | 0.27 |
| Ca(OH)2 | 0.2 |
| Water (W) | 1.0 |
| Sand | 13 |
EXAMPLE III
Table 3 shows the mass ratio of each component in the cement and the sand added when the strength mechanical property test was performed in this example.
TABLE 3
Example four
Table 4 describes the components of the cement and the mass ratio of sand and crushed stone added when preparing concrete using the cement.
TABLE 4
| Concrete composition | |
| Fly ash (I) | 0.9 |
| Na2SiO3Aqueous solution (n ═ 3.36) | 1.6 |
| Slag of mine | 3.3 |
| NaOH | 0.32 |
| Water (W) | 0.4 |
| Sand (Mx 2.6) | 6.9 |
| Small stone (5-16mm) | 3 |
| Large stone (10-20mm) | 8 |
The cement materials of examples one to three were tested for setting time and strength mechanical properties.
The setting time test method is carried out according to the standard consistency water consumption, setting time and stability of cement. According to detection, the initial setting time of the cementing materials of the first embodiment to the third embodiment is more than 20min, and the final setting time is less than 60 min. The setting time of the cementing material can be completely regulated and controlled by adjusting the proportion of each component.
The molding method and test of the flexural strength and compressive strength refer to "cement mortar Strength test method (ISO method)", GB/T17671-1999. And adding sand into the cementing material to prepare mortar. The molded mortar test piece is prepared into a mortar test piece of 40mm multiplied by 160mm, and then the test is carried out according to the requirements, and the test results are shown in table 5.
The concrete of example four was tested for strength mechanical properties. The concrete forming and detecting method refers to the regulations of national standard GB/T50081 of 'common concrete mechanical property test method', the size of a compression-resistant test piece is 150mm multiplied by 150mm, and the size of a breaking strength test piece is 150mm multiplied by 550 mm. The concrete properties were tested and the results are shown in table 5.
TABLE 5
As can be seen from Table 5, the flexural strength of the mortar prepared by the cementing material provided by the invention can reach 5.7MPa and 58.5MPa in 28 days, and the flexural strength of the concrete can reach 8.0MPa and 63MPa in 28 days. The folding ratio is 0.10 to 0.15.
Compared with the existing cement-based inorganic material, the cementing material provided by the invention has good mechanical properties. The setting time of mortar and concrete prepared by the cementing material provided by the invention can be completely regulated and controlled, and the compressive strength and the flexural strength are excellent.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. The invention is therefore not to be limited to the specific details described herein, without departing from the general concept as defined by the appended claims and their equivalents.
Claims (9)
1. The cementing material is characterized by comprising aluminosilicate-containing industrial solid waste and an alkali activator in a mass ratio of 4.0-5.0: 1.85-2.8.
2. The cementitious material of claim 1, wherein the aluminosilicate containing industrial solid waste comprises fly ash and slag.
3. The cementitious material of claim 1 or claim 2, wherein the alkali activator comprises an alkali metal silicate and an alkali metal hydroxide.
4. The cementitious material of claim 3, wherein the alkali silicate is Na2SiO3An aqueous solution.
5. The cementitious material of claim 4, wherein the alkali metal hydroxide comprises NaOH.
6. The cementing material of claim 5, wherein the cementing material is prepared from fly ash, slag and Na in a mass ratio of 0.9-2.2: 1.8-4.0: 1.6-1.8: 0.27-0.32: 0-0.32SiO3Aqueous solution, NaOH and Ca (OH)2Composition of, wherein, Na2SiO3Aqueous solutionHas a solid content of 34.5% and Na2SiO3The modulus of the alkali activator composed of the aqueous solution and NaOH is 1.2-1.4.
7. Use of a cementitious material according to any one of claims 1 to 6.
8. Use of a cementitious material according to any one of claims 1 to 6 in concrete or mortar.
9. Concrete, characterized in that it is produced with a cementitious material according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010152183.4A CN111205005A (en) | 2020-03-06 | 2020-03-06 | Cementing material, application and concrete |
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| CN202010152183.4A CN111205005A (en) | 2020-03-06 | 2020-03-06 | Cementing material, application and concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111892343A (en) * | 2020-08-18 | 2020-11-06 | 交通运输部公路科学研究所 | Alkali-activated geopolymer concrete mix proportion design method |
| CN116082006A (en) * | 2023-02-15 | 2023-05-09 | 中国地质大学（北京） | Sandwich-structured formaldehyde degradation functional gel building material and preparation method thereof |
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| CN107777981A (en) * | 2017-11-02 | 2018-03-09 | 广东工业大学 | A kind of regeneration concrete and preparation method thereof |
| CN108975836A (en) * | 2018-08-29 | 2018-12-11 | 广州大学 | A kind of Electromgnetically-transparent composite material and preparation method and application |
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2020
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| CN1546410A (en) * | 2003-12-01 | 2004-11-17 | 同济大学 | Composite cement with large amount of coal gangue and its preparation method |
| CN104278609A (en) * | 2014-07-24 | 2015-01-14 | 北京奥润开元环保科技研究院有限公司 | Road pavement material prepared by compounding residue soil and steel slag and method for preparing road pavement material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111892343A (en) * | 2020-08-18 | 2020-11-06 | 交通运输部公路科学研究所 | Alkali-activated geopolymer concrete mix proportion design method |
| CN116082006A (en) * | 2023-02-15 | 2023-05-09 | 中国地质大学（北京） | Sandwich-structured formaldehyde degradation functional gel building material and preparation method thereof |
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Application publication date: 20200529 |