水资源与水工程学报2024，Vol.35Issue(4)：162-168,7.DOI:10.11705/j.issn.1672-643X.2024.04.19
滑石粉替代膨润土掺量对塑性混凝土性能的影响
Performance of plastic concrete influenced by partial replacement of bentonite with talc
摘要
Abstract
This study aims to reduce the elastic modulus of plastic concrete but keep its high impermea-bility performance by partially replacing bentonite with talc,while maintaining the strength of the con-crete.To this end,bentonite based plastic concrete with two types of water cement ratios were prepared,with different dosages of talc as the replacement of bentonite,which are 0,5％,10％,15％and 20％of the binding material.The effect of talc dosage on the properties of the plastic concrete was studied by tes-ting the working performance of the concrete mixture,compressive strength,elastic modulus and imper-meability of the bentonite based plastic concrete,as well as the microscopic morphology observation.The results showed that with the increase in talc dosage,the slump,expansion and compressive strength of the bentonite based plastic concrete mixtures all increased and then decreased,while the permeability coeffi-cient of the concrete decreased first and then increased,and these parameters showed the extreme values when the talc dosage was 10％.However,the elastic modulus of the bentonite based plastic concrete mixtures showed a very slight decrement when the talc dosage was 5％,while decreased significantly as the increase of the talc dosage.Using talc to partially replace bentonite reduced pores in the concrete ma-trix which in turn made the concrete structure denser,and the concrete matrix with talc dosage of 10％was denser than that of 20％.The bentonite based plastic concrete with talc dosage of 10％showed the optimum comprehensive effect with improved working performance of the concrete mixture,enhanced compressive strength and impermeability as well as decreased elastic modulus of the plastic concrete.关键词
塑性混凝土/滑石粉掺量/弹性模量/抗渗性能/微观形貌Key words
plastic concrete/talc content/elastic modulus/impermeability performance/microscopic morphology分类
建筑与水利引用本文复制引用
刘彦钰,张博,罗伊明,陈博文,姚汝方..滑石粉替代膨润土掺量对塑性混凝土性能的影响[J].水资源与水工程学报,2024,35(4):162-168,7.基金项目
陕西省自然科学基础研究计划项目(2023-JC-QN-0519) （2023-JC-QN-0519）
