基于正交试验C70山砂混凝土的配和比设计  

The Mix Design of C70 Rock Sand Concrete Based on Orthogonal Experiment

作　　者：杨方 申波[1,2] 李友彬 刘轶[3] 项秋展[3] YANG Fang;SHENG Bo;LI Youbin;LIU Yi;XIANG Qiuzhan(Space Structures Research Center,Guizhou University,Guiyang 550003,China;Guizhou Provincial Key Laboratory of Structural Engineering,Guiyang 550025,China;College of Civil Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学空间结构研究中心,贵州贵阳550003 [2]贵州省结构工程重点实验室,贵州贵阳550025 [3]贵州大学土木工程学院,贵州贵阳550025

出　　处：《贵州大学学报（自然科学版）》2020年第4期93-98,共6页Journal of Guizhou University:Natural Sciences

基　　金：贵州省教育厅自然科学研究资助项目(黔教合KY字[2015]364号);贵州省科技支撑计划资助项目(社会发展攻关)(黔科合SY字[2012]3067)。

摘　　要：山砂原材资源丰富、取材便捷,已广泛用于普通强度等级的混凝土。山砂表面粗糙、级配差、含泥量大等特点使其在配制高强度混凝土时具有一定难度。本文采用人工水洗山砂,在固定胶凝材料用量的情况下,考虑砂率、水胶比、矿物掺和料组合掺量3个因素,每个因素考虑3个水平,找出各因素对混凝土标准龄期抗压强度的影响,利用正交实验设计优选混凝土的配合比设计参数。基于最优配合比设计参数,研究山砂石粉含量对高强混凝土和易性和抗压强度的影响。试验结果表明:最佳配合比方案为A1B2C2,机制山砂中含有7%至10%的石粉能改善混凝土的工作性能和抗压强度。Rock sand can be easily obtained and has been widely used in ordinary strength concrete with abundant raw materials.Making high strength concrete has certain difficulty,as rock sand has many edges and corners,poor grading,high crusher dust content and mud content,etc.In this paper,the mix proportion design parameters of high strength concrete were optimized by using the orthogonal experimental design.In the case of certain cementitious materials,three factors were considered,sand rate,water-binder ratio,combined amount of mineral admixture,three levels of each factor were considered,and the optimal mix proportion design parameters on the compressive strength of concrete was found out.Based on the optimal mix proportion design,the influence of the crusher dust content on flow performance and compressive strength of high strength concrete was studied.The experimental results show that optimal mix proportion design scheme is A 1 B 2 C 2;rock sand containing 7%to 10%crusher dust content can improve the working performance and compressive strength of high strength concrete made of rock sand.

关 键 词：高强混凝土 正交试验设计 机制山砂 石粉含量 

分 类 号：TU528.31[建筑科学—建筑技术科学]