Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/84030

Title

Effect of pore-size distribution on shrinkage of concretes

Author(s)

Aly, T.;  Sanjayan, J. G.

Abstract

The effects of pore structure of concrete made with slag-blended cement on shrinkage behavior of concrete when exposed to drying were presented in this paper. The investigated parameters were the length of curing (1-day and 7-day curing), slag and gypsum contents in mixtures. Pore structure analysis was studied by conducting mercury intrusion porosimetry and nitrogen gas adsorption technique tests. The results show that 65% slag concrete with 7-day curing exhibited the lowest shrinkage evolution compared to 0, 35, 50% slag mixes. This is attributed to the highest pore radius where meniscus forms when drying in these concretes. It was found that addition of gypsum in slag mixes tend to reduce the nanopores (within the range from 4 to 20 nm pore size) and decrease the proportion of mesopores. The higher proportion of mesopores and the lower value of meniscus pore radius could explain the increase in drying shrinkage of concrete made with 65% slag cement containing 0% added gypsum.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences

Source

Journal of Materials in Civil Engineering, Vol. 22, no. 5 (May 2010), pp. 525-532

Publication year

2010

FOR Code(s)

0905 Civil Engineering;  0912 Materials Engineering

Keyword(s)

Concrete;  Dewatering;  Drying;  Pore-size distribution;  Shrinkage

Publisher

American Society of Civil Engineers

ISSN

0899-1561

Publisher URL

http://dx.doi.org/10.1061/(asce)0899-1561(2010)22:5(525)

Copyright

Copyright © ASCE.

Additional information

The writers gratefully acknowledge the financial support provided by the Independent Cement and Lime Pty Ltd (ICL) (Industry Partner) and the Australian Research Council (Linkage Project Grant No. LP0349121) for this research project.

Peer reviewed