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Effects and threshold of water film thickness on multi-mineral cement paste
Cement and Concrete Composites ( IF 10.5 ) Pub Date : 2020-05-18 , DOI: 10.1016/j.cemconcomp.2020.103677
Hengrui Liu , Xiao Sun , Hui Du , Hao Lu , Yuanshan Ma , Weikang Shen , Zhenghong Tian

In this study, the effect of the water film thickness (WFT) on unary, binary, and ternary mixtures containing cement, basalt powder (BP), and zeolite powder (ZP) were investigated. The correlations between the WFT and the flow parameters, rheological parameters, cohesiveness, and bleeding rate were investigated using statistical methods. The experimental results showed that the addition of ZP or BP could increase the paste's packing density and cohesiveness and reduce the bleeding rate. A good rheological performance and high hardened compressive strength could be achieved simultaneously with suitable substitutions. The correlation coefficient of the WFT vs. the bleeding rate of the multi-mineral cement paste obtained by statistical analysis increased with time due to the physical process of particle settling. The WFT and flow parameters, such as the flow spread and flow rate, of the multi-mineral cement paste could be precisely described by by a single function. In-depth analysis indicated that there was a threshold value of the WFT that could be used to distinguish the effects of ZP and BP on the rheological parameters of the cement paste. This represents the critical point at which the mineral admixture loses its morphological effect on the flow performance of the cement paste. The existence and conditions for this threshold value were further proven by theoretical analysis based on the Brownian, gravitational, and colloidal attraction forces.



中文翻译:

水膜厚度对多矿物水泥浆的影响和阈值

在这项研究中,研究了水膜厚度(WFT)对包含水泥,玄武岩粉(BP)和沸石粉(ZP)的一元,二元和三元混合物的影响。使用统计方法研究了WFT与流动参数,流变参数,内聚性和出血率之间的相关性。实验结果表明,添加ZP或BP可以提高糊料的堆积密度和内聚力,并降低渗出率。通过适当的替代,可以同时获得良好的流变性能和较高的硬化抗压强度。由于颗粒沉降的物理过程,通过统计分析获得的WFT的相关系数与多矿物水泥浆的渗出率之间的关系随时间增加。WFT和流量参数,多矿物水泥浆的流动分布和流速等单个功能可以精确描述。深入分析表明,存在一个WFT阈值,可以用来区分ZP和BP对水泥浆流变参数的影响。这代表了矿物掺合料对水泥浆的流动性能失去形态影响的临界点。通过基于布朗,重力和胶体吸引力的理论分析进一步证明了该阈值的存在和条件。深入分析表明,存在一个WFT阈值,可用于区分ZP和BP对水泥浆流变参数的影响。这代表了矿物掺合料对水泥浆的流动性能失去形态影响的临界点。通过基于布朗,重力和胶体吸引力的理论分析进一步证明了该阈值的存在和条件。深入分析表明,存在一个WFT阈值,可用于区分ZP和BP对水泥浆流变参数的影响。这代表了矿物掺合料对水泥浆的流动性能失去形态影响的临界点。通过基于布朗,重力和胶体吸引力的理论分析进一步证明了该阈值的存在和条件。

更新日期:2020-05-18
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