改性温轮胶微丸对水泥浆体性能的影响及其作用机理研究

发布时间：2018-02-09 18:44

本文关键词： 改性温轮胶微丸流变性能静置泌水率强度　出处：《武汉理工大学学报》2017年01期 　论文类型：期刊论文

【摘要】：研制开发出了一种新型的改性温轮胶微丸,旨在改善温轮胶与聚羧酸减水剂之间的竞争吸附问题,即解决原状温轮胶和聚羧酸减水剂共同使用时,原状温轮胶虽然改善浆体的离析泌水,但会大幅降低浆体流动性的问题。对掺入该类型温轮胶微丸后水泥浆体的1h静置泌水率、流变性能、水泥砂浆流动性和胶砂强度的变化进行了研究。结果表明:改性温轮胶微丸能够有效地降低水泥浆体的触变性,当改性温轮胶微丸掺入水泥浆体中时,水泥浆体1h静置泌水率和原状温轮胶一样,能很好地解决浆体的离析泌水问题,同时能够改善水泥砂浆的工作性能并能在一定程度上增进水泥胶砂的强度。其原因是改性温轮胶一方面会形成三维空间网状结构,具有与原状温轮胶相同的增稠、抗离析泌水和剪切稀化的特性;另一方面,衣膜材料与聚羧酸减水剂不存在竞争吸附问题,当其溶解后温轮胶才得到释放,而后释放的温轮胶在浆体中起到增进稳定性的作用,对流动性影响小。
[Abstract]:A new type of modified thermoplastic pellets was developed to improve the competitive adsorption between thermoplastic and polycarboxylic acid superplasticizer, that is, to solve the problem of using the original thermoplastic and polycarboxylic acid water reducer together. Although the undisturbed warm rosin can improve the segregation and bleeding of the slurry, it will greatly reduce the flow of the slurry. The static bleeding rate and rheological property of the cement paste after the addition of this type of warm rosin glue pellet were studied. The fluidity of cement mortar and the change of cement mortar strength are studied. The results show that the modified warm round rubber pellets can effectively reduce the thixotropy of cement paste, and when the modified warm round rubber pellets are mixed into the cement paste, The static bleeding rate of the cement paste for 1 hour is as good as that of the undisturbed warm rubber, which can solve the problem of separation and bleeding of the slurry. At the same time, it can improve the working performance of cement mortar and enhance the strength of cement mortar to some extent. On the other hand, the film material and polycarboxylic acid superplasticizer have no competitive adsorption problem, and when it dissolves, the warm rosin is released, and the released thermo-gel plays a role in enhancing the stability of the slurry. It has little effect on liquidity.
【作者单位】：武汉理工大学硅酸盐建筑材料国家重点实验室;武汉理工大学材料科学与工程学院;河北鑫合生物化工有限公司;
【基金】：国家自然科学基金(51202173)
【分类号】：TQ172.1

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