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- Title
Mitigating shrinkage cracking in stucco through the replacement of fine aggregate with expanded perlite.
- Authors
Mamun, Muhammad; Bindiganavile, Vivek
- Abstract
This paper describes a quantitative study on shrinkage cracking in stucco. Two series of mixes were examined with the binder to fine aggregate volumetric ratio of 0.20 and 0.25, respectively. In each series, specially engineered expanded perlite was incorporated as a replacement to the fine aggregate at up to 75% by volume. An environmental chamber was setup to create extreme conditions for moisture loss through sustained high temperature and low humidity. Commercially recommended stucco mixes were cast into plates, which were evaluated for linear and volumetric shrinkage. At the same time, crack growth at the end of a 48 h exposure period was evaluated for total length and area. It was found that while adding expanded perlite did not notably reduce the total linear or volumetric shrinkage, it significantly lessened crack development. This was attributed to the increase in tensile strain capacity imparted by the expanded perlite, as evidenced from flexural testing.
- Subjects
STUCCO; EFFECT of temperature on building materials; PERLITE; TENSILE strength; FLEXURAL strength
- Publication
Canadian Journal of Civil Engineering, 2012, Vol 39, Issue 8, p906
- ISSN
0315-1468
- Publication type
Article
- DOI
10.1139/l2012-075