Application of nanoindentation to investigate chemomechanical properties change of cement paste in the carbonation reaction  

作　　者：HAN JianDe PAN GangHua SUN Wei WANG CaiHui CUI Dong 

机构地区：[1]School of Materials Science and Engineering,Southeast University,Nanjing 211189,China [2]Jiangsu Key Lab of Construction Material,Nanjing 211189,China

出　　处：《Science China(Technological Sciences)》2012年第3期616-622,共7页中国科学（技术科学英文版）

基　　金：supported by the National Basic Research Program of China ("973" Project) (Grant No. 2009CB623200);the Scientific Research Foundation of the Graduate School of Southeast University (Grant No. YBJJ1113)

摘　　要：Nanoindentation technique was adopted to investigate the chemomechanical properties change of hardened cement paste before and after carbonation.It was found that the mean elastic modulus and mean hardness obviously increase after the carbonation reaction.Specifically,the probability of the elastic modulus showed a sharp reduction for the elastic modulus at the range of 7-34 and 83-160 GPa,in comparison of a large increase for the elastic modulus between 34-83 GPa.For the same reason,the probability of the hardness showed a large decrease when the hardness fell within 0.15-1.75 and 4.15-8.20 GPa and a dramatic increase for the hardness at the range of 1.75-4.15 GPa.In addition,low density C-S-H was affected by the carbonation degradation more seriously than high density C-S-H.The carbonation reaction led to distinct decrease of the number and size of unhydrated cement paste particles.

关 键 词：NANOINDENTATION cement paste CARBONATION elastic modulus HARDNESS 

分 类 号：TU528.32[建筑科学—建筑技术科学] TB938.2[一般工业技术—计量学]