TY - JOUR
T1 - Prediction of the autogenous shrinkage and microcracking of alkali-activated slag and fly ash concrete
AU - Li, Zhenming
AU - Lu, Tianshi
AU - Chen, Yun
AU - Wu, Bei
AU - Ye, Guang
PY - 2021
Y1 - 2021
N2 - This study aims to predict the autogenous shrinkage of alkali-activated concrete (AAC) based on slag and fly ash. A variety of analytical and numerical models are available for the prediction of autogenous shrinkage of ordinary Portland cement (OPC) concrete, but these models are found to show dramatic discrepancies when applied for AAC due to the different behaviours of these two systems. In this study, a new numerical approach is developed to predict the autogenous shrinkage of alkali-activated slag (AAS) and alkali-activated slag-fly ash (AASF) concrete from the experimental results on corresponding paste. In this approach, the creep of AAS and AASF and the restraining effect of the aggregate are particularly considered. By this approach, a fairly good prediction is obtained. Moreover, the microcracking in paste caused by restraining aggregates is evaluated. The results indicate that AAC is subjected to high tendency of development of microcracking.
AB - This study aims to predict the autogenous shrinkage of alkali-activated concrete (AAC) based on slag and fly ash. A variety of analytical and numerical models are available for the prediction of autogenous shrinkage of ordinary Portland cement (OPC) concrete, but these models are found to show dramatic discrepancies when applied for AAC due to the different behaviours of these two systems. In this study, a new numerical approach is developed to predict the autogenous shrinkage of alkali-activated slag (AAS) and alkali-activated slag-fly ash (AASF) concrete from the experimental results on corresponding paste. In this approach, the creep of AAS and AASF and the restraining effect of the aggregate are particularly considered. By this approach, a fairly good prediction is obtained. Moreover, the microcracking in paste caused by restraining aggregates is evaluated. The results indicate that AAC is subjected to high tendency of development of microcracking.
KW - Aggregate
KW - Alkali-activated slag and fly ash
KW - Autogenous shrinkage
KW - Creep
KW - Microcracking
KW - Prediction
UR - http://www.scopus.com/inward/record.url?scp=85098543057&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2020.103913
DO - 10.1016/j.cemconcomp.2020.103913
M3 - Article
AN - SCOPUS:85098543057
SN - 0958-9465
VL - 117
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 103913
ER -