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Effectiveness of Various Superabsorbent Polymers (SAP) in Mitigating Autogenous Shrinkage of Cement-based Materials
Synthetic superabsorbent polymers (SAP) were studied here as chemical admixtures in mitigating autogenous shrinkage of high-strength concrete or mortar. The sorptivity of the SAPs was quantified in saline solutions which mimicked the ionic composition of cement pore solution and in the cement pore solution itself. Ca²+ ions essentially modified this sorptivity. SAPs of maximum anionicity released the stored ionic solution swiftly to a large extent, whereas SAPs containing acrylamide as a comonomer retained the liquid over a longer term. These kinetics could be directly linked to the efficiency of the SAPs in mitigating autogenous shrinkage of high-strength mortar. The SAPs which released liquid freely reduced autogenous shrinkage significantly less than the more retentive SAPs. Finally, the compressive strength of the mortars under investigation was determined. It became obvious that only a well-balanced selection of SAP type and dosage in conjunction with the most appropriate amount of extra water for internal curing has no negative effect, but can even lead to an increase in compressive strength.
Effectiveness of Various Superabsorbent Polymers (SAP) in Mitigating Autogenous Shrinkage of Cement-based Materials
Synthetic superabsorbent polymers (SAP) were studied here as chemical admixtures in mitigating autogenous shrinkage of high-strength concrete or mortar. The sorptivity of the SAPs was quantified in saline solutions which mimicked the ionic composition of cement pore solution and in the cement pore solution itself. Ca²+ ions essentially modified this sorptivity. SAPs of maximum anionicity released the stored ionic solution swiftly to a large extent, whereas SAPs containing acrylamide as a comonomer retained the liquid over a longer term. These kinetics could be directly linked to the efficiency of the SAPs in mitigating autogenous shrinkage of high-strength mortar. The SAPs which released liquid freely reduced autogenous shrinkage significantly less than the more retentive SAPs. Finally, the compressive strength of the mortars under investigation was determined. It became obvious that only a well-balanced selection of SAP type and dosage in conjunction with the most appropriate amount of extra water for internal curing has no negative effect, but can even lead to an increase in compressive strength.
Effectiveness of Various Superabsorbent Polymers (SAP) in Mitigating Autogenous Shrinkage of Cement-based Materials
Mechtcherine, V. (author) / Schroefl, C. (author) / Gorges, M. (author)
Ninth International Conference on Creep, Shrinkage, and Durability Mechanics (CONCREEP-9) ; 2013 ; Cambridge, Massachusetts, United States
2013-09-23
Conference paper
Electronic Resource
English
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