Effects of Shale and CaO Incorporation on Mechanical Properties and Autogenous Deformation of Early-age Concrete  

作　　者：ZHAO Haitao LI Jinghao LIU Hui XU Wen LI Hua WANG Penggang HUANG Jie ZHANG Yuming PAN Li JIANG Jianhua 赵海涛;LI Jinghao;LIU Hui;徐文;LI Hua;王鹏刚;HUANG Jie;ZHANG Yuming;PAN Li;JIANG Jianhua(College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China;College of Materials Science and Engineering,Southeast University,Nanjing 211189,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;Agile Property Holdings Co.,Ltd.,Guangzhou 510000,China;Jiangsu Sobute New Materials Co.Ltd.,Nanjing 211103,China;Department of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Digital Engineering Institute,Henan Water&Power Engineering Consulting Co.,Ltd.,Zhengzhou 450016,China)

机构地区：[1]College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China [2]College of Materials Science and Engineering,Southeast University,Nanjing 211189,China [3]School of Civil Engineering,Chongqing University,Chongqing 400045,China [4]Agile Property Holdings Co.,Ltd.,Guangzhou 510000,China [5]Jiangsu Sobute New Materials Co.Ltd.,Nanjing 211103,China [6]Department of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China [7]Digital Engineering Institute,Henan Water&Power Engineering Consulting Co.,Ltd.,Zhengzhou 450016,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2021年第5期653-663,共11页武汉理工大学学报（材料科学英文版）

基　　金：Funded by National Natural Science Foundation of China(Nos.U1965105,51878245,52008189);Fundamental Research Funds for the Central Universities(No.B200203197);National Key Research and Development Program of China(No.2017YFB0310100);Ningbo 2025 Science and Technology Major Project(No.2020Z035);the State Key Laboratory of High Performance Civil Engineering Materials(No.2019CEM001)。

摘　　要：The pre-soaked shale employed as an internal curing agent and CaO employed as expansion agent were incorporated into concrete to investigate their effects on the mechanical properties and autogenous deformation of early-age concrete.We have conducted the relevant tests for setting time,mechanical properties,internal relative humidity and autogenous deformation of early-age concrete with shale or/and CaO incorporation.The results indicate that the set behavior is delayed by shale addition but is accelerated with CaO.The shale addition firstly enhances and subsequently decreases the strength,but CEA addition has a weakening effect.Additionally,shale or/and CaO incorporation deteriorates the elastic modulus.The shale and CaO incorporation significantly improve the internal relative humidity of concrete.The internal curing efficacy of shale could synergistically mitigate the autogenous shrinkage,that is,could enhance the expansion of CaO and then greatly reduce the contraction,which is significantly beneficial to impede the shrinkage-introduced cracks of early-age concrete.

关 键 词：early-age concrete internal curing pre-soaked shale CaO-based expansion agent mechanical properties autogenous deformation 

分 类 号：TU528[建筑科学—建筑技术科学]