A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
High-performance viscosity-reducing polycarboxylic acid concrete water reducing agent and preparation method thereof
The invention relates to a high-performance viscosity-reducing polycarboxylic acid concrete water reducing agent and a preparation method thereof. A main reaction unit is polymerized with other functional monomers in an aqueous solution under the action of a persulfate initiation system to generate the viscosity-reducing polycarboxylic acid concrete water reducing agent containing ester functional groups and block propane side chains. The production process is simple to operate, the viscosity of the high-grade fresh concrete can be effectively reduced, and the effect of improving the workability and the construction performance of the fresh concrete is achieved. The molecular weight of the viscosity reduction type polycarboxylate superplasticizer provided by the invention is 15000-25000, and when the viscosity reduction type polycarboxylate superplasticizer is compounded with the polycarboxylate superplasticizer for use, adsorption can be preferentially carried out, a thicker adsorption layer is formed, the adsorption effect between hydrates is reduced, more free water is released, and finally, better viscosity reduction and fluidity keeping effects are achieved; the viscosity reducer has obvious viscosity reduction effect in high-grade concrete with low water cement ratio, has good adaptability with river sand and machine-made sand, has obvious effects of improving workability and improving sand and gravel wrapping property through slurry extraction, and improves the working performance of the concrete.
本发明涉及一种高性能降粘型聚羧酸混凝土减水剂及其制备方法，由主反应单元在水溶液中在过硫酸盐引发体系作用下与其它功能单体聚合生成一种含酯类官能团和嵌段丙烷侧链的降粘型混凝土聚羧酸减水剂。生产过程操作简单，可有效降低高标号新拌混凝土的粘度，并且具有改善新拌混凝土和易性、施工性能的作用。本发明提供的降粘型聚羧酸减水剂，分子量在15000‑25000，与其复合使用时可以优先吸附，形成更厚的吸附层，降低水化物间的吸附作用，释放更多的游离水，最终起到更好的降粘和保持流动性的作用；在低水灰比高标号混凝土中降粘效果明显，并且与河沙、机制砂适应性良好，有明显的改善和易性、提浆增加砂石包裹性的作用，改善了混凝土的工作性能。
High-performance viscosity-reducing polycarboxylic acid concrete water reducing agent and preparation method thereof
The invention relates to a high-performance viscosity-reducing polycarboxylic acid concrete water reducing agent and a preparation method thereof. A main reaction unit is polymerized with other functional monomers in an aqueous solution under the action of a persulfate initiation system to generate the viscosity-reducing polycarboxylic acid concrete water reducing agent containing ester functional groups and block propane side chains. The production process is simple to operate, the viscosity of the high-grade fresh concrete can be effectively reduced, and the effect of improving the workability and the construction performance of the fresh concrete is achieved. The molecular weight of the viscosity reduction type polycarboxylate superplasticizer provided by the invention is 15000-25000, and when the viscosity reduction type polycarboxylate superplasticizer is compounded with the polycarboxylate superplasticizer for use, adsorption can be preferentially carried out, a thicker adsorption layer is formed, the adsorption effect between hydrates is reduced, more free water is released, and finally, better viscosity reduction and fluidity keeping effects are achieved; the viscosity reducer has obvious viscosity reduction effect in high-grade concrete with low water cement ratio, has good adaptability with river sand and machine-made sand, has obvious effects of improving workability and improving sand and gravel wrapping property through slurry extraction, and improves the working performance of the concrete.
本发明涉及一种高性能降粘型聚羧酸混凝土减水剂及其制备方法，由主反应单元在水溶液中在过硫酸盐引发体系作用下与其它功能单体聚合生成一种含酯类官能团和嵌段丙烷侧链的降粘型混凝土聚羧酸减水剂。生产过程操作简单，可有效降低高标号新拌混凝土的粘度，并且具有改善新拌混凝土和易性、施工性能的作用。本发明提供的降粘型聚羧酸减水剂，分子量在15000‑25000，与其复合使用时可以优先吸附，形成更厚的吸附层，降低水化物间的吸附作用，释放更多的游离水，最终起到更好的降粘和保持流动性的作用；在低水灰比高标号混凝土中降粘效果明显，并且与河沙、机制砂适应性良好，有明显的改善和易性、提浆增加砂石包裹性的作用，改善了混凝土的工作性能。
High-performance viscosity-reducing polycarboxylic acid concrete water reducing agent and preparation method thereof
一种高性能降粘型聚羧酸混凝土减水剂及其制备方法
QIAN ZHONGQIU (author) / WANG WENJUN (author) / WANG DAOZHENG (author) / CHEN NAN (author) / ZHAO LI (author) / LI BAOCHUAN (author)
2022-03-01
Patent
Electronic Resource
Chinese
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