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.
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)
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)。
