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通过改变水灰比、减水剂掺量,测定不同时间水泥浆体中的自由溶液量、浆体流动度与流动度经时损失,并利用光学显微镜直接观测新拌水泥浆体中水的分布情况以及水泥颗粒的絮凝情况,研究自由溶液量的变化情况及其对浆体流动度和泌水的影响规律.研究结果表明,吸附水对水泥-减水剂系统的初始流动度、流动度经时损失和泌水等相容性表现有重要影响.增加水泥浆体中的吸附水,能够改善水泥-减水剂系统的相容性.掺加减水剂,在打破絮凝结构的同时增加吸附水,从而提高浆体的流动性.聚羧酸减水剂增加吸附水的能力要高于萘系减水剂.过掺减水剂不是导致泌水的主要原因,过大的水灰比和水泥颗粒表面吸附水的能力不足才是导致泌水的根本原因.
By changing the ratio of water to cement and water reducer, the amount of free solution in cement slurry, the fluidity and the fluidity loss over time were measured, and the distribution of water in the fresh cement slurry was observed directly by optical microscope The situation of cement flocculation and the flocculation of cement particles to study the changes of the amount of free solution and its influence on fluidity and bleeding.The results show that the initial fluidity and fluidity of cement- Time loss and bleeding compatibility has an important impact on the increase of cement slurry adsorption water can improve the compatibility of cement - superplasticizer system.Adding superplasticizer, breaking the flocculation structure while increasing adsorption Water, thereby increasing the fluidity of the slurry polycarboxylate superplasticizer to increase the ability to adsorb water than naphthalene superplasticizer.Adjustment superplasticizer is not the main reason leading to bleeding, excessive water-cement ratio and Cement particles on the surface of the ability to absorb water is the root cause of bleeding.