CN111892342A - Preparation method of high-strength low-shrinkage cement composite material - Google Patents
Preparation method of high-strength low-shrinkage cement composite material Download PDFInfo
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- CN111892342A CN111892342A CN202010830015.6A CN202010830015A CN111892342A CN 111892342 A CN111892342 A CN 111892342A CN 202010830015 A CN202010830015 A CN 202010830015A CN 111892342 A CN111892342 A CN 111892342A
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- composite 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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides a preparation method of a high-strength low-shrinkage cement composite material, which is characterized in that hollow fly ash is added into cement partially substituted by waste glass, acrylamide and a sodium acrylate copolymer are doped into the cement to form an interpenetrating grid structure, and the shrinkage rate of the cement composite material is reduced due to the existence of a grid microstructure while the high strength is ensured.
Description
Technical Field
The invention belongs to the technical field of preparation and application of cement materials, and particularly relates to a high-strength low-shrinkage cement composite material and a preparation method thereof.
Background
Cement is produced and used in large quantities due to its role as a high-strength binder in concrete. The cement production consumes a large amount of industrial energy and discharges a large amount of carbon dioxide, and the global warming and climate change are accelerated, so that the cement production becomes one of the most consumed and most polluted production. However, the demand for cement continues to grow vigorously, and production volumes and production rates are increasing every year. In order to reduce the consumption of cement, the feasible solution of reducing the use of cement by using industrial byproducts or solid wastes instead of cement finally reduces the emission of greenhouse gases. Some pozzolanic materials, such as fly ash, silica fume and blast furnace slag, have been successfully used as cement substitutes in the early days, but they are not viable long-term solutions because they are also by-products of other energy intensive and air polluting industries. Therefore, compared to industrial by-products, recycled waste is preferable, and they can replace cement, thereby promoting green construction and sustainability.
The press-crushed fine glass particles have pozzolanic properties, and therefore waste glass as a recycled material is also used in the construction industry. Because the components of the glass are stable, the physical and chemical properties of the waste glass are not changed even if the glass is recycled for many times. Therefore, the waste glass material is being widely recycled.
Durability is an important attribute for composite cement material applications. Recycled waste glass is generally used as a fine aggregate substitute in concrete, but the incorporation of waste glass increases the probability of alkali-silica reaction, but reduces the mechanical properties and durability of concrete. The particle size and the packing structure of the waste glass determine the probability of the alkali silicon reaction. Another important indicator of durability is the shrinkage of cement, typically a lightweight aggregate with more voids than the cement slurry matrix. The polymer additive is useful for improving the durability of lightweight concrete for cement composites because it has the ability to enhance the connectivity between a dense internal structure and blocked pores, resulting in a reduction in water absorption, and enhances the binding force between lightweight aggregate concrete particles, but it is difficult to form a dense internal structure with fly ash as a lightweight aggregate due to the self-weight of waste glass.
Disclosure of Invention
1. In order to solve the defect of high porosity and low strength of a cement material substituted by waste glass, the invention provides a preparation method of a high-strength low-shrinkage cement composite material.
2. The cement composite material provided by the invention is partially replaced by waste glass with the coarse granularity of 80-120 mu m after being pressed, and the bulk density is 300-500 kg/m3The fly ash is used as a micro-aggregate, the fly ash is mixed by using an improved mixing method, polymer dry powder is doped during mixing, the polymer dry powder contains a copolymer of ammonium persulfate, acrylamide and sodium acrylate, an interpenetrating grid structure is formed, and finally the high-strength low-shrinkage cement composite material is obtained.
Furthermore, the mass ratio of the waste glass to the cement is 10-30%; the cement is commercially available cement, and the chemical components of the cement are MgO and Al2O3、SiO2、SO4、K2O、CaO、Fe2O3。
The coal ash is hollow particles, and the mass ratio of the coal ash to the waste glass is 1: 1-2;
the mass ratio of ammonium sulfate to the copolymer of acrylamide and sodium acrylate in the polymer is 1: (0.2-5); the particle size of the copolymer of acrylamide and sodium acrylate is 80-120 mu m; the total polymer mass is 0.2-0.5% of the waste glass.
The invention also provides an improved mixing method, which is used for mixing in a forced concrete mixer and comprises the following specific steps:
(1) mixing the dry powder for 1-5 min; (2) adding industrial water and a water reducing agent; (3) mixing for 5-15 min at a low speed of 0.5-1.5 m/s to a high speed of 2.0-3.0 m/s and then at a low speed of 0.5-1.5 m/s;
adding the polymer in the form of dry powder, and adding the polymer dry powder when mixing for 0.5-1 min; the polymer dry powder needs to be subjected to ultrasonic treatment for 5-20 min in advance, so that the dispersibility of the polymer dry powder is improved.
The water reducing agent is a commercial polycarboxylic acid water reducing agent, and the water reducing rate is 20-30%;
advantageous effects
1. The cement composite material prepared by the method provided by the invention has the advantages that the hollow fly ash is added into the cement partially substituted by the waste glass to serve as a framework, the copolymer of the acrylamide and the sodium acrylate is favorable for forming an interpenetrating grid structure and uniformly filling the waste glass with larger self weight, meanwhile, due to the existence of the grid structure, the tensile stress formed during shrinkage can be effectively extended and transmitted, and the stability of the interpenetrating structure enables the cement composite material to show extremely low shrinkage rate.
2. In the process of preparing the cement composite material, the method provided by the invention adopts a high-speed and low-speed cross mixing method for mixing, which is beneficial to mixing the waste glass and the fly ash with large weight difference, enhances the reaction activity with the polymer and simultaneously shortens the production time.
3. The preparation method of the cement composite material provided by the invention has the advantages that the strength activity index is 120-130%, the drying shrinkage is lower than 130 mu m/m, the shrinkage of the composite material is reduced, and compared with the traditional material, the crack can be effectively reduced.
Drawings
FIG. 1 is an SEM image of the interpenetrating network structure formed in example 2
Detailed Description
The present invention is further illustrated by the following specific examples, which should not be construed as limiting the scope of the invention.
Example 1: the mass proportion of the waste glass replacing the cement is 10 percent
The bulk density is 500kg/m3The hollow fly ash, the waste glass with the coarse grain size of 80 mu m after being pressed and the cement raw material are mixed, the mass ratio of the fly ash to the waste glass is 1: 1-2, and the mixture is added with the following components in a mass ratio of 1: 0.2 dry powder of a copolymer of ammonium sulfate with acrylamide and sodium acrylate. Carrying out ultrasonic treatment on the polymer dry powder for 20min in advance to improve the dispersibility of the polymer dry powder, and adding the polymer dry powder when mixing is started for 1 min; mixing by using an improved mixing method, and stirring in a forced concrete mixer, wherein the concrete steps are as follows: (1) mixing the dry powder for 1 min; (2) adding industrial water and a water reducing agent; (3) Mixing for 15 min at a stirring speed from 1.5 m/s at a low speed to 2.0 m/s at a high speed and then to 0.5 m/s at a low speed;
the finally prepared cement composite material forms an obvious interpenetrating network structure, the strength activity index is 120%, the drying shrinkage of the cement composite material is lower than 128 mu m/m, the shrinkage of the cement composite material is reduced, and compared with the traditional material, the crack can be effectively reduced.
Example 2: the mass proportion of the waste glass replacing the cement is 20 percent
The bulk density is 400kg/m3The hollow fly ash, the waste glass with the coarse grain size of 100 mu m after being pressed and the cement raw material are mixed, the mass ratio of the fly ash to the waste glass is 1: 1-2, and the mixture is added with the following components in a mass ratio of 1:1 of a dry powder of a copolymer polymer of ammonium sulfate with acrylamide and sodium acrylate. The polymer dry powder needs to be subjected to ultrasonic treatment for 5 min in advance, the dispersibility of the polymer dry powder is improved, and the polymer dry powder is added when the mixing is started for 0.5 min; mixing by using an improved mixing method, and stirring in a forced concrete mixer, wherein the concrete steps are as follows: (1) mixing the dry powder for 5 min; (2) adding industrial water and a water reducing agent; (3) mixing for 10 min at a stirring speed from 1 m/s at a low speed to 3.0 m/s at a high speed and then from 1.5 m/s at a low speed;
the finally prepared cement composite material forms an obvious interpenetrating network structure, as shown in figure 1, the strength activity index is 130%, the drying shrinkage is lower than 130 mu m/m, the shrinkage of the composite material is reduced, and compared with the traditional material, the crack is effectively reduced by 90%.
Example 3: the mass proportion of the waste glass replacing the cement is 30 percent
The bulk density is 300kg/m3The hollow fly ash, the pressed waste glass with the coarse particle size of 90 mu m and the cement raw material are mixed, the mass ratio of the fly ash to the waste glass is 1: 1-2, and the mass ratio of the fly ash to the waste glass is 1:5 ammonium sulfate and acrylamide and sodium acrylate copolymer dry powder. Carrying out ultrasonic treatment on the polymer dry powder for 10 min in advance, improving the dispersibility of the polymer dry powder, and adding the polymer dry powder when mixing is started for 50 s; mixing by using an improved mixing method, and stirring in a forced concrete mixer, wherein the concrete steps are as follows: (1) mixing the dry powder for 3 min; (2)adding industrial water and a water reducing agent; (3) mixing at low speed of 0.5 m/s to high speed of 2.5 m/s and low speed of 1 m/s for 5 min;
the finally prepared cement composite material forms an obvious interpenetrating network structure, the strength activity index is 125%, the shrinkage of the composite material with the drying shrinkage lower than 126 mu m/m is reduced, and compared with the traditional material, the shrinkage of the composite material is effectively reduced by 87%.
Example 4: the mass proportion of the waste glass replacing the cement is 20 percent
The bulk density is 400kg/m3The hollow fly ash, the waste glass with the coarse grain size of 100 mu m after being pressed and the cement raw material are mixed, the mass ratio of the fly ash to the waste glass is 1:5, and the mass ratio of the fly ash to the waste glass is 1:1 of ammonium sulfate and acrylamide monomer polymer dry powder. The polymer dry powder needs to be subjected to ultrasonic treatment for 5 min in advance, the dispersibility of the polymer dry powder is improved, and the polymer dry powder is added when the mixing is started for 0.5 min; mixing by using an improved mixing method, and stirring in a forced concrete mixer, wherein the concrete steps are as follows: (1) mixing the dry powder for 5 min; (2) adding industrial water and a water reducing agent; (3) mixing for 10 min at a stirring speed from 1 m/s at a low speed to 3.0 m/s at a high speed and then from 1.5 m/s at a low speed;
when the mass of the waste glass is greatly different from that of the fly ash, the cement composite material prepared by only adopting ammonium sulfate and acrylamide monomer polymer dry powder cannot form an obvious interpenetrating network structure, the strength activity index is 80 percent, the drying shrinkage is more than 300 mu m/m, the shrinkage is greatly increased, the strength is low, and the practical application is not facilitated.
Claims (9)
1. The preparation method of the high-strength low-shrinkage cement composite material is characterized in that the prepared cement composite material is a cement composite material partially replaced by waste glass with the pressed coarse grain size of 80-120 mu m, and the bulk density is 300-500 kg/m3The fly ash is used as a micro-aggregate, the fly ash is mixed by using an improved mixing method, polymer dry powder is doped during mixing, the polymer dry powder contains a copolymer of ammonium persulfate, acrylamide and sodium acrylate, an interpenetrating grid structure is formed, and finally the high-strength low-shrinkage cement composite material is obtained.
2. The method for preparing the cement composite material as claimed in claim 1, wherein the mass ratio of the waste glass to the cement is 10 to 30%; the cement is commercially available portland cement.
3. The preparation method of the cement composite material as claimed in claim 1, wherein the fly ash is hollow particles, and the mass ratio of the fly ash to the waste glass is 1: 1-2.
4. The method of preparing a cementitious composite as claimed in claim 1 wherein the mass ratio of ammonium sulfate to the copolymer of acrylamide and sodium acrylate in the polymer is 1: (0.2-5); the particle size of the copolymer of acrylamide and sodium acrylate is 80-120 mu m; the total polymer mass is 0.2-0.5% of the waste glass.
5. A method of preparing a cementitious composite as claimed in claim 1 wherein the mixing is carried out in a forced concrete mixer using a modified mixing method comprising the specific steps of:
(1) mixing the dry powder for 1-5 min; (2) adding water and a water reducing agent; (3) the stirring speed is from 0.5 to 1.5 m/s at a low speed to 2.0 to 3.0 m/s at a high speed and then from 0.5 to 1.5 m/s at a low speed, and the mixture is mixed for 5 to 15 min.
6. The method for preparing a cement composite material according to claim 1, wherein the polymer is added in the form of dry powder, and the polymer dry powder is added when the mixing is started for 0.5 to 1 min; the polymer dry powder needs to be subjected to ultrasonic treatment for 5-20 min in advance, so that the dispersibility of the polymer dry powder is improved.
7. The method for preparing the cement composite material according to claim 5, wherein the water reducing agent is a commercially available polycarboxylic acid water reducing agent, and the water reducing rate is 20-30%.
8. The method for preparing a cement composite material according to claim 1, wherein the strength activity index of the finally obtained cement composite material is 120-130%, and the drying shrinkage is less than 130 μm/m.
9. A high strength low shrinkage cement composite material, characterized by being produced by the method of producing a cement composite material according to any one of claims 1 to 8.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA1862001A (en) * | 2001-02-06 | 2002-04-15 | Tribovent Verfahrensentwicklg | METHOD FOR PRODUCING A ADMINISTER FOR MIXING CEMENTS AND DEVICE FOR CARRYING OUT THIS METHOD |
| CN103922653A (en) * | 2014-03-31 | 2014-07-16 | 南华大学 | Preparation method of cement mortar |
| CN104558370A (en) * | 2015-01-22 | 2015-04-29 | 武汉大学 | Application of modified water-absorbing resin as concrete antifreezing reinforcing material |
| CN104893694A (en) * | 2015-06-02 | 2015-09-09 | 中科华星新材料有限公司 | High-strength low-density cement paste |
| CN105906262A (en) * | 2016-04-15 | 2016-08-31 | 湖北大学 | Continuous fine swelling controlled concrete-filled steel tube |
| CN106380103A (en) * | 2016-08-29 | 2017-02-08 | 山东江泰建材科技有限公司 | Segregation and weeping inhibitor for cement concrete and preparation method thereof |
-
2020
- 2020-08-18 CN CN202010830015.6A patent/CN111892342B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA1862001A (en) * | 2001-02-06 | 2002-04-15 | Tribovent Verfahrensentwicklg | METHOD FOR PRODUCING A ADMINISTER FOR MIXING CEMENTS AND DEVICE FOR CARRYING OUT THIS METHOD |
| CN103922653A (en) * | 2014-03-31 | 2014-07-16 | 南华大学 | Preparation method of cement mortar |
| CN104558370A (en) * | 2015-01-22 | 2015-04-29 | 武汉大学 | Application of modified water-absorbing resin as concrete antifreezing reinforcing material |
| CN104893694A (en) * | 2015-06-02 | 2015-09-09 | 中科华星新材料有限公司 | High-strength low-density cement paste |
| CN105906262A (en) * | 2016-04-15 | 2016-08-31 | 湖北大学 | Continuous fine swelling controlled concrete-filled steel tube |
| CN106380103A (en) * | 2016-08-29 | 2017-02-08 | 山东江泰建材科技有限公司 | Segregation and weeping inhibitor for cement concrete and preparation method thereof |
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