摘要
提出了一种基于多种性能要求的混凝土组成设计方法。首先采用混合砂石容重法确定粗、细骨料的最紧密堆积和骨料间最小空隙率;其次结合Bowromi公式和耐久性要求,确定混凝土的水胶比,然后根据骨料间的最小孔隙率和达到所需工作性或流变特性的骨料表面富余浆体厚度,得到混凝土中浆体量,通过调整减水剂和黏度改性剂来调节混凝土的屈服应力和塑性黏度,改善混凝土的工作性能。在此基础上采用单纯型重心设计法设计胶凝材料组成,用最少的实验量建立混凝土性能与胶凝材料组成间的关系,最后根据对混凝土不同性能的要求,确定满足要求的胶凝材料组成范围。同时,该方法可用于预测不同胶凝材料组成制备的混凝土性能。
A method for mixture design of concrete with multiple performance requirements is proposed. Firstly, the maximal unit masses of fine and coarse aggregates are obtained through measuring their bulk densities. Considering the Bowromi equation and the durability requirements, the water-cement ratio are determined. After that, the excess paste thickness achieves the required workability can be calculated according to the minimum porosity between the aggregates and then the paste content can be obtained. By adjusting the dosage of superplasticizer or viscosity modifying agent, the yield stress and viscosity of concrete can be adjusted as required. The composition of cementitious materials is designed by using simplex centroid design method and then its relationships with the properties of concrete are established. In the last, the range of cementitious materials composition can be obtained according to the requirements for different properties of concrete. In addition, this method can also be used to predict the performances of concrete with different compositions of cementitious materials.
作者
史才军
王德辉
安晓鹏
焦登武
李晃
SH1 Caijun1, WANG Dehui1, AN Xiaopeng2, JIAO Dengwu1, LI Huang1(1. Key Lab for Green ＆ Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China; 2. State Key Lab. of Green Building Materials, China Building Materials Academy, Beijing 100024, Chin)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2018年第2期230-238,共9页
Journal of The Chinese Ceramic Society
基金
国家重点研发计划(2017YFB0310101)
国家自然科学基金(U1305243)
国家国际科技合作专项(2015DFA50880)
