Prediction of the autogenous shrinkage and microcracking of alkali-activated slag and fly ash concrete

Prediction of the autogenous shrinkage and microcracking of alkali-activated slag and fly ash concrete

Li, Z. (TU Delft Materials and Environment)
Lu, T. (TU Delft Materials and Environment)
Chen, Y. (TU Delft Materials and Environment; South China University of Technology)
Wu, B. (TU Delft Materials and Environment)
Ye, G. (TU Delft Materials and Environment; Universiteit Gent)

2021

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.

Aggregate
Alkali-activated slag and fly ash
Autogenous shrinkage
Creep
Microcracking
Prediction

http://resolver.tudelft.nl/uuid:2b3d07c4-5464-4c1b-80a3-cfeab571e519

https://doi.org/10.1016/j.cemconcomp.2020.103913

0958-9465

Cement and Concrete Composites, 117

Institutional Repository

journal article

© 2021 Z. Li, T. Lu, Y. Chen, B. Wu, G. Ye