卵石破碎原状机制砂石粉含量限值试验研究  

Experimental Study on Limit of Stone-powder of Gravel-crushed Proto-machine-made Sand for Concrete

作　　者：李凤兰[1] 孙秋彦[1] 朱倩[1] 

机构地区：[1]华北水利水电学院河南省水工结构与材料工程重点学科开放实验室,郑州450011

出　　处：《长江科学院院报》2010年第8期66-69,共4页Journal of Changjiang River Scientific Research Institute

基　　金：郑州市科技领军人才资助项目(096SYJH23105)

摘　　要：采用石粉（粒径小于75μm的颗粒）含量为3％-13％的卵石破碎原状机制砂配制强度等级C30，C40和C50混凝土，分析了石粉含量对混凝土拌合物工作性能及混凝土抗压强度、抗拉强度和弹性模量的影响规律。研究结果表明，对卵石冲洗后加以破碎的原状机制砂，其石粉含量可超出现行建筑用砂规范的限值，控制在13％以内时可满足混凝土拌合物的工作性能和现行规范对混凝土基本力学性能的要求。该研究对机制砂生产工艺的革新和生产效率的提高具有重要价值。The gravel-crushed proto-machine-made sands containing stone powder （particle size being less than 75 μm） with quantity content from 3% to 13% were used for mixing concrete of grade C30, C40 and C50. The influ- ences of stone powder content on the workability of fresh concrete and the compressive strength, tensile strength and elastic modulus of concrete were analyzed. It can be concluded that for the proto-machine-made sands made by the gravels washed before crushed, the stone powder content can be taken over the limit specified in current standard of building sands. When the content is limited in 13%, the workability of fresh concrete is better, the compressive and tensile strength as well as the elastic modulus of concrete can satisfy the requirements of current code. The study is very important for the innovation of production techniques and the promotion of productivity.

关 键 词：混凝土 卵石破碎原状机制砂 石粉含量 拌合物工作性能 抗压强度 抗拉强度 弹性模量 

分 类 号：TU521.1[建筑科学—建筑技术科学] TU528.1