微粒混凝土基本力学特性及其影响参数的试验研究  

Experimental research on basic mechanical properties of microconcrete and its influence parameters

作　　者：李绿宇 国巍[1,2] LI Luyu GUO Wei(School of Civil Engineering,Central South University, Changsha 410075, China National Engineering Laboratory for High Speed Railway Construction Changsha 410075, China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程实验室,湖南长沙410075

出　　处：《世界地震工程》2016年第4期277-283,共7页World Earthquake Engineering

基　　金：国家自然科学基金项目(50938008;51108466);长江学者和创新团队发展计划资助项目(IRT1296)

摘　　要：微粒混凝土主要用于混凝土结构模型试验,它是一种由小粒径骨料、水泥和水按一定比例组成的混凝土。由于骨料粒径变小引起了混凝土力学性能的改变,确定微粒混凝土的力学性能的影响因素是模型试验的一个关键问题。主要考虑水泥强度等级、水灰比和砂率的影响,采用正交试验法设计微粒混凝土的配合比,制作了两批试件,各16组,研究了上述因素对微粒混凝土轴心抗压强度和弹性模量的影响。结果表明,水泥强度等级和水灰比对微粒混凝土轴心抗压强度的影响显著,且水泥强度等级影响最大;水灰比和砂率对微粒混凝土弹性模量的影响显著,且水灰比影响最大。Microconcrete is mainly used to model test of concrete structure, and it is a kind of concrete composed of the small diameter of aggregate, cement and water according to a certain proportion. As a redution of aggregate size cause the change of mechanical performance of the concrete, determination of the factors influencing mechanical properties of microconcrete is a key problem of model test. In this paper, the cement strength level, water cement ratio and sand ratio were mainly considered. In the experiment, the specimens were made and divided into two batches, the orthogonal test method was used to design the proportioning ratio. There are sixteen groups in each batch. The influence of those factors on the axial compressive strength and elastic modulus of microconcrete was studied respectively. The results show that the effect of the cement strength level and water cement ratio on the axial compressive strength of microconcrete is significant while the cement strength level has the most significant effect on it ; water cement ratio and sand ratio have remarkable influence on the elastic modulus of microconcrete, and the most siginificant effect is the water cement ratio .

关 键 词：模型试验 正交试验 微粒混凝土 轴心抗压强度 弹性模量 

分 类 号：TU502.6[建筑科学—建筑技术科学]