doi:10.16186/j.cnki.1673-9787.2020050032

Received:2020/05/11

Revised:2020/09/29

Published:2022/03/15

Influence of ceramsite pore on performance of concrete strength and chloride ion permeability resistance

YANG Jianhui1, FANGBin 1, GAO Tengfei2, YUJianyu 3

1.Henan Province Engineering Laboratory for Eco-architecture and the Built Environment, Henan Polytechnic University, Jiaozuo  454000 , Henan, China;2.Mingzi Engineering Consultant Co. ,Ltd. of Shenzhen City,Zhengzhou  450001 ,Henan, China;3.Henan Province Engineering Construction Group Co. , Ltd. , Zhengzhou  450002 , Henan, China

Abstract: To investigate the effect of pore structure characteristics of ceramsite and hybrid aggregate concrete with less ceramsite(HACC) on compressive strength and chloride ion penetration resistance,the microcosmic and microscopic characteristics of pore structure were analyzed by scanning electron microscopy (SEM) and pore structure scanning analyzer.The relationships among pore diameter,aperture rate,porosity and compressive strength,chloride ion penetration resistance of concrete,respectively,under different replacement rate of ceramsite,and the damage model based on stress-strain curves,were discussed.The results showed that the influence of ceramsite on the compressive strength of HACC was because of the effects of water reabsorbed and released by ceramsite,which could enhance the internal curing function.Compared to the control group,the number of pores with diameter smaller than 100 μm increased relatively,and that larger than 100 μm decreased relatively.But,within a certain range of replacement rate,the compressive strength of concrete could be enhanced because both the average diameter of pores and the porosity within concrete were decreasing relatively,which could increase the wall thickness of pores and the effective cross-sectional area.For example,both the compressive strength and the elastic modulus of concrete were the biggest when 10% replacement rate of ceramsite.On the other hand,it was the main influencing factor for improving chloride ion penetration resistance because of the number of pores with diameter smaller than 100 μm increasing,and that of the disconnected pores increasing.

Key words:specified density concrete;hybrid aggregate concrete with less ceramsite;pore structure;chloride ionpenetration;damage model

 陶粒孔隙对混凝土抗压强度和抗氯离子渗透性能的影响_杨健辉.pdf