砂的级配特性对砂浆流变性的影响及预测  

Influence of Gradational Characteristics of Sands on Rheology Properties ofMortar and Rheology Prediction

作　　者：王珩[1,2,3] 陆采荣 刘伟宝[1,2,3] 梅国兴 戈雪良[1,2,3] 杨虎 WANG Heng;LU Cairong;LIU Weibao;MEI Guoxing;GE Xueliang;YANG Hu(Nanjing Hydraulic Research Institute,Nanjing 210029,China;Research Center of Ministry of Water Resources on New Materials in Hydraulic Structures,Nanjing 210024,China;State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering,Nanjing 210029,China)

机构地区：[1]南京水利科学研究院,南京210029 [2]水利部水工新材料工程技术研究中心,南京210024 [3]水文水资源与水利工程科学国家重点实验室,南京210029

出　　处：《材料导报》2020年第S02期255-260,共6页Materials Reports

基　　金：中央级公益性科研院所基本科研业务费专项资金(Y418007)。

摘　　要：采用配制的不同颗粒级配的人工砂和天然河砂配制砂浆,并采用流变仪进行流变参数(屈服应力、塑性粘度)测试,结果表明,砂的体积率、细度模数及石粉含量直接影响了流变参数,其中砂体积率存在临界值。通过对砂的颗粒分形曲线的分析,得出砂的分形特征量化值,由此定义了分形和数S y和S v,并发现该值与流变参数存在指数对应关系。在悬浮体流变参数预测公式的基础上引入分形和数,对预测方法进行了拓展。以试验数据为基础,通过拟合得到相关系数,得出具体的流变参数预测公式。将流变参数计算值与试验值进行对比,结果表明两者一致性很好。Mortars made from manufactured and natural river sands with different gradations were prepared, and its rheology parameters(yield stress & plastic viscosity) were measured by rheometer. The experimental result indicated that the volume rate of sand, fineness modulus and content of stone powder have direct impact on rheology properties, meanwhile, the threshold volume rate of sand exist. Based on analysis on the fractal curve of sand particles, the quantity value of sand fractal characteristics were obtained, and then the fractal sums(S_y, S_v) were defined to express the exponential relationship with rheology parameters. Furthermore, based on the rheology prediction expression of suspension, the fractal sums were introduced and the prediction method is developed. From the experimental data, the related coefficients were derived by fitting and the modified equations were obtained. The calculated value and test value of rheology were compared and the result showed good consistency.

关 键 词：级配 分形 流变性 预测 

分 类 号：TU528.041[建筑科学—建筑技术科学]