Fly ash-based polymer mortar repair material and preparation method thereof
阅读说明：本技术 一种粉煤灰基地聚合物砂浆修补材料及其制备方法 (Fly ash-based polymer mortar repair material and preparation method thereof ) 是由 吴大志 陈柯宇 易鸣 余璐 张振营 于 2020-06-02 设计创作，主要内容包括：本发明属于道路修补材料技术领域,具体涉及一种粉煤灰基地聚合物砂浆修补材料及其制备方法以重量份数计,包括如下组分：低钙粉煤灰32-45份,水玻璃溶液8-12份,NaOH 3-4份,纳米二氧化硅凝胶1-2份,钢纤维1.6-2.5份,碳酸钙晶须0.2-0.3份,纯水8-11份,中砂64-90份。本发明的地质聚合物砂浆修补材料具有清洁绿色、强度高、开放交通时间短、耐久性好、新旧混凝土界面作用强及收缩性能好的特点。(The invention belongs to the technical field of road repairing materials, and particularly relates to a fly ash-based polymer mortar repairing material and a preparation method thereof, wherein the fly ash-based polymer mortar repairing material comprises the following components in parts by weight: 32-45 parts of low-calcium fly ash, 8-12 parts of water glass solution, 3-4 parts of NaOH, 1-2 parts of nano silica gel, 1.6-2.5 parts of steel fiber, 0.2-0.3 part of calcium carbonate whisker, 8-11 parts of pure water and 64-90 parts of medium sand. The geopolymer mortar repair material has the characteristics of cleanness, greenness, high strength, short open traffic time, good durability, strong interface effect of new and old concrete and good shrinkage performance.)
1. A fly ash-based polymer mortar repair material is characterized in that: the paint comprises the following components in parts by weight:
32-45 parts of low-calcium fly ash, 8-12 parts of water glass solution, 3-4 parts of NaOH, 1-2 parts of nano silica gel, 1.6-2.5 parts of steel fiber, 0.2-0.3 part of calcium carbonate whisker, 8-11 parts of pure water and 64-90 parts of medium sand.
2. The fly ash based geopolymer mortar repair material as claimed in claim 1, wherein: the water glass is water glass for buildings, the Baume degree is 35-40, and the modulus of the water glass is 3.0-3.3.
3. The fly ash based geopolymer mortar repair material as claimed in claim 1, wherein: NaOH is pure in solid analysis, and the purity is 99.5%.
4. The fly ash based geopolymer mortar repair material as claimed in claim 1, wherein: the low-calcium powdered coal ash powder comprises Al2O3And SiO2(ii) a And the particle size of the low-calcium fly ash is within the range of 0.1-50 mu m.
5. The fly ash based geopolymer mortar repair material as claimed in claim 1, wherein: the grain diameter of the medium sand is within the range of 0.25mm-0.5mm, and the fineness modulus is 1.6-3.7.
6. A fly ash based geopolymer mortar repair material according to claims 1-5, characterized in that: the colloidal nano silicon dioxide has the average particle diameter of 8mm-14mm, the solid content of 30% -35% and the PH value of 7-7.5.
7. The fly ash based geopolymer mortar repair material as claimed in claim 1, wherein: wherein the length of the steel fiber is 10mm-15mm, the diameter is 0.08mm-0.12mm, and the tensile strength is more than 1200 MPa; the length of the calcium carbonate crystal whisker is 3mm-5mm, the diameter is 2 μm-3 μm, and the tensile strength is more than 2200 MPa.
8. The method for preparing the fly ash based geopolymer mortar repair material according to any one of claims 1 to 7, which is characterized by comprising the following steps:
s1, preparing 32-45 parts of low-calcium fly ash, 8-12 parts of water glass solution, 3-4 parts of NaOH, 1-2 parts of nano silica gel, 1.6-2.5 parts of steel fiber, 0.2-0.3 part of calcium carbonate whisker, 8-11 parts of pure water and 64-90 parts of medium sand by weight;
s2, mixing the water glass solution with NaOH to obtain an alkali activator, and standing for 24 hours;
s3, mixing the low-calcium fly ash and the medium sand, and performing dry mixing for 3-5 minutes to obtain a premix;
s4, adding the alkali activator, the colloidal nano-silica and the pure water obtained in the step S2 into the premix obtained in the step S3, and continuing to stir for 3-5 minutes;
and S5, after uniformly stirring, gradually adding the steel fibers and the calcium carbonate whiskers, and stirring for 3 minutes to obtain uniform slurry.
Technical Field
The invention belongs to the technical field of road repairing materials, and particularly relates to a fly ash-based polymer mortar repairing material and a preparation method thereof.
Background
Road traffic infrastructure in China is developed greatly, the total mileage of roads is the first place in the world, and at present, the total mileage of roads in China exceeds four million kilometers, wherein more than half of road surfaces are cement concrete road surfaces. As traffic volume and road surface loads increase, traditional early cement concrete roads suffer from different levels of damage, such as pitted surfaces, slab staggering, cracking, peeling, and the like. These disruptions can have a more severe impact on road traffic.
The traditional cement-based repairing material has the problems of weak bonding property of new and old cement concrete interfaces, large energy consumption and the like, gradually does not meet the requirement of quick green repairing, and limits the further application of the material. Therefore, a road patching material with excellent performance, high early strength, good interface bonding and small shrinkage is needed.
Geopolymers are a new class of inorganic gelling materials. The reaction mechanism is as follows: the silicon-aluminum oxide breaks aluminum-oxygen bonds (Al-O) and silicon-oxygen bonds (Si-O) in an alkaline environment, and the product forms an oligomeric structural unit by breaking oxygen bridges in medium water. The product has the advantages of fast setting and hardening, high early strength, high bonding strength, good durability and the like, and is an excellent repairing material. The fly ash is fine ash captured from flue gas after high-temperature calcination of raw coal, and the effective utilization rate of the fly ash in the world is only 20-30% according to statistics, and the fly ash is mostly used as a mineral component to have synergistic effect with portland cement. The rest of the fly ash is discarded in the landfill, causing pollution to soil, water and air. From the perspective of environmental protection, however, the fly ash has a good pozzolanic effect, does not need to consume a large amount of energy in the alkali excitation process, reduces unnecessary carbon dioxide emission, and conforms to the trend of the building industry for sustainable development. Therefore, the potential of the prepared geopolymer mortar repair material prepared by utilizing the fly ash can be better exerted, and the advantages of the repair material are fully utilized.
How to design a fly ash based polymer mortar repair material to replace the traditional cement repair material becomes a problem for those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide a fly ash based polymer mortar repair material.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the fly ash-based polymer mortar repair material comprises the following components in parts by weight:
32-45 parts of low-calcium fly ash, 8-12 parts of water glass solution, 3-4 parts of NaOH, 1-2 parts of nano silica gel, 1.6-2.5 parts of steel fiber, 0.2-0.3 part of calcium carbonate whisker, 8-11 parts of pure water and 64-90 parts of medium sand.
Preferably, the water glass is water glass for buildings, the Baume degree is 35-40, and the modulus of the water glass is 3.0-3.3.
Preferably, the NaOH is pure as a solid assay with a purity of 99.5%.
Preferably, the low-calcium powdered coal ash powder comprises Al2O3And SiO2(ii) a And the particle size of the low-calcium fly ash is within the range of 0.1-50 mu m.
Preferably, the particle size of the medium sand is within the range of 0.25mm-0.5mm, and the fineness modulus is 1.6-3.7.
Preferably, the colloidal nanosilica has an average particle size in the range of 8mm to 14mm, a solids content of 30% to 35%, and a pH of 7 to 7.5.
Preferably, the length of the steel fiber is 10mm-15mm, the diameter is 0.08mm-0.12mm, and the tensile strength is more than 1200 MPa; the length of the calcium carbonate crystal whisker is 3mm-5mm, the diameter is 2 μm-3 μm, and the tensile strength is more than 2200 MPa.
The invention also provides a preparation method of the fly ash-based polymer mortar repair material, which comprises the following steps:
s1, preparing 32-45 parts of low-calcium fly ash, 8-12 parts of water glass solution, 3-4 parts of NaOH, 1-2 parts of nano silica gel, 1.6-2.5 parts of steel fiber, 0.2-0.3 part of calcium carbonate whisker, 8-11 parts of pure water and 64-90 parts of medium sand by weight;
s2, mixing the water glass solution with NaOH to obtain an alkali activator, and standing for 24 hours;
s3, mixing the low-calcium fly ash and the medium sand, and performing dry mixing for 3-5 minutes to obtain a premix;
s4, adding the alkali activator, the colloidal nano-silica and the pure water obtained in the step S2 into the premix obtained in the step S3, and continuing to stir for 3-5 minutes;
and S5, after uniformly stirring, gradually adding the steel fibers and the calcium carbonate whiskers, and stirring for 3 minutes to obtain uniform slurry.
Compared with the prior art, the invention has the advantages that:
1. the geopolymer mortar repair material has the characteristics of cleanness, greenness, high strength, short open traffic time, good durability, strong interface effect of new and old concrete and good shrinkage performance.
2. The invention adopts colloidal nano silicon dioxide and multi-scale fiber, and fully exerts the synergistic optimization effect of the colloidal nano silicon dioxide and the multi-scale fiber on the performance of the geopolymer concrete test block: the colloidal nanosilica fills a portion of the polymer pores and the reaction during the polymerization process produces a large amount of reaction products of aluminosilicate gel and the primary raw materials, making the matrix more dense. The steel fiber and the calcium carbonate whisker have larger size and length difference to form a multi-scale fiber system, which can further increase the toughness of the geopolymer mortar, restrain the plastic deformation of the material and bear a part of internal force. The addition of the materials reduces the construction cost and improves the performance and the construction performance of the materials.
3. The fly ash-based mortar repair material doped with colloidal nano-silica and multi-scale fibers has a simple preparation process and is easy to popularize.
Detailed Description
The following detailed description of specific embodiments of the present invention is provided to facilitate understanding and appreciation of the inventive concepts.