Influence of lightweight aggregate and calcium sulfoaluminate cement on deformation of ordinary Portland cement mortar and concrete
Wu, Di
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https://hdl.handle.net/2142/87979
Description
Title
Influence of lightweight aggregate and calcium sulfoaluminate cement on deformation of ordinary Portland cement mortar and concrete
Author(s)
Wu, Di
Issue Date
2015-06-29
Director of Research (if dissertation) or Advisor (if thesis)
Mondal, Paramita
Department of Study
Civil & Environmental Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Shrinkage mitigation
Lightweight aggregate
Calcium sulfoaluminate cement
Abstract
Cracking due to shrinkage is a predominant cause of concrete constructions degradation. Several strategies were developed to mitigate shrinkage in concrete. The addition of pre-soaked lightweight aggregate (LWA) and usage of calcium sulfoaluminate (CSA) cement are two common methods applied in shrinkage mitigation. Pre-soaked LWA supplies additional moisture to cement paste during hydration, thereby compensating for the water consumption that occurs during hydration and drying. CSA cement induces expansion of the matrix, which counteracts shrinkage.
This thesis presents the results from a wide range of tests that examined the effectiveness of LWA and CSA cement on shrinkage mitigation of mortar and concrete. The results indicate that the addition of pre-soaked LWA could reduce the shrinkage under sealed conditions, and the effectiveness is influenced by the dosage of pre-soaked LWA, w/c ratio and soaking time of LWA. Under unsealed conditions, the addition of pre-soaked LWA is not an effective way on shrinkage mitigation. However, LWA does affect the shrinkage of the matrix by influencing the stiffness of the entire matrix. The combined use of pre-soaked LWA and CSA cement could more effectively mitigate shrinkage, and the effect was more significant with increasing dosage of LWA.
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