Combined effect of shrinkage reducing admixtures (SRA) and superabsorbent polymers (SAP) on the autogenous shrinkage, hydration and properties of cementitious materials

By Wehbe, Yara; Ghahremaninezhad, Ali
Published in Construction and Building Materials NULL 2017

Abstract

Abstract This paper examines the combined effect of superabsorbent polymers (SAP) and shrinkage reducing admixtures (SRA) on the autogenous shrinkage, hydration, microstructure, and properties of cementitious materials. The addition of {SRA} was found to reduce the absorption of {SAP} in the extracted pore solution as well as in the cement pastes. It was shown that the cement pastes with both {SAP} and {SRA} exhibited a higher shrinkage than the cement paste with SAP, more notably at the early age. The hydration temperature peak of the cement paste with both {SRA} and {SAP} occurred sooner than that of the cement paste with {SRA} at early age. The non-evaporable water content measurement indicated a higher degree of hydration for the cement paste with both {SRA} and {SAP} than the cement paste with {SRA} due to the internal curing effect of SAP. The compressive strength and electrical resistivity of the cement paste with both {SRA} and {SAP} were shown to be lower than those of the cement paste with {SAP} and the cement paste with SRA. Addition of {SAP} appeared to promote increased Ca(OH)2 formation in the hydration product. {SEM} examination indicated a distribution of microvoids in the range of 10

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