Effect of Substitution of Cement by Mineral Powders on the Physico-mechanical Properties and Microstructure of Sand Concretes  

作　　者：Belkacem Belhadj Justin Houessou Nicolas Montrelay Michèle Quéneudec 

机构地区：[1]SREML Laboratory,University Amar Telidji,BP 37 G,Laghouat,03000,Algeria [2]Research unit“EPROAD”,University of Picardie Jules Verne,Amiens,80000,France

出　　处：《Journal of Architectural Environment & Structural Engineering Research》2022年第4期18-29,共12页建筑环境与结构工程研究（英文）

摘　　要：The approach that contributes to the development of eco-materials in construction is the use of mineral powders,which can improve mechani­cal properties and reduce cement consumption.This article aims to study the effect of substitution by mass of cement with mineral powders on the physicomechanical properties and microstructure of sand concretes.The used mineral powders are A:the limestone,B:the natural pozzolan,C:the hydraulic lime,D:(1/3 limestone+1/3 natural pozzolan+1/3 hydraulic lime),and E:(1/2 natural pozzolan+1/2 hydraulic lime).The studied percentages are 5%,10%and 15%,in both separated and combined states.The studied properties are workability,compressive strength,the elastic­ity modulus in compression,shrinkage and microstructure analysis.The objective is to target the optimal percentage of the substitution of cement with mineral powders,which ensures the best compromise between the main properties of the studied sand concretes.The obtained results show that the optimal percentage is in favor of the substitution of cement by 10%D(1/3 limestone,1/3 natural pozzolan and 1/3 hydraulic lime).Even the 15%of mineral powder D,presented similar performances compared to the sand concrete(without mineral powders).Finally,in the context of the development of eco-materials,it should be noted that the 10%D and 15%D(1/3 limestone,1/3 natural pozzolan and 1/3 hydraulic lime)contribute to decrease the use of cement and consequently to reduce of CO2 emissions.

关 键 词：Eco-materials Sand concretes CEMENTS Mineral powders Physico-mechanical properties MICROSTRUCTURE 

分 类 号：TB3[一般工业技术—材料科学与工程]