Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Can superabsorent polymers mitigate autogenous shrinkage of internally cured concrete without compromising the strength?
Highlights ► Discussion of results by Craeye et al. (Consr Build Mater 2011;25:1–13). ► They conclude: Addition of superabsorbent polymer (SAP) reduces concrete strength. ► The theoretical background for using SAP as internal curing is explained. ► Results by Craeye et al. seem to be due to overestimation of SAP water absorption. ► SAP can mitigate autogenous shrinkage of concrete without compromising strength.
Abstract The paper “Super absorbing polymers as an internal curing agent for mitigation of early-age cracking of high-performance concrete bridge decks” deals with different aspects of using superabsorbent polymers (SAP) in concrete to mitigate self-desiccation. The paper concludes that “Addition of SAP leads to a significant reduction of mechanical strength”. The experimental results are in contradiction with several publications and question the appropriateness of using SAP as internal curing agent. However, the observed strength loss – and possibly also other observations – seems to be caused by overestimation of SAP water absorption. This results in an increase in water/cement ratio (w/c) for concrete with SAP. It is misleading to conclude on how SAP influences concrete properties, based on comparison of concrete mixes with SAP and reference concrete without SAP, if SAP mixes have higher w/c than the reference mix.
Can superabsorent polymers mitigate autogenous shrinkage of internally cured concrete without compromising the strength?
Highlights ► Discussion of results by Craeye et al. (Consr Build Mater 2011;25:1–13). ► They conclude: Addition of superabsorbent polymer (SAP) reduces concrete strength. ► The theoretical background for using SAP as internal curing is explained. ► Results by Craeye et al. seem to be due to overestimation of SAP water absorption. ► SAP can mitigate autogenous shrinkage of concrete without compromising strength.
Abstract The paper “Super absorbing polymers as an internal curing agent for mitigation of early-age cracking of high-performance concrete bridge decks” deals with different aspects of using superabsorbent polymers (SAP) in concrete to mitigate self-desiccation. The paper concludes that “Addition of SAP leads to a significant reduction of mechanical strength”. The experimental results are in contradiction with several publications and question the appropriateness of using SAP as internal curing agent. However, the observed strength loss – and possibly also other observations – seems to be caused by overestimation of SAP water absorption. This results in an increase in water/cement ratio (w/c) for concrete with SAP. It is misleading to conclude on how SAP influences concrete properties, based on comparison of concrete mixes with SAP and reference concrete without SAP, if SAP mixes have higher w/c than the reference mix.
Can superabsorent polymers mitigate autogenous shrinkage of internally cured concrete without compromising the strength?
Hasholt, Marianne Tange (Autor:in) / Jensen, Ole Mejlhede (Autor:in) / Kovler, Konstantin (Autor:in) / Zhutovsky, Semion (Autor:in)
Construction and Building Materials ; 31 ; 226-230
19.12.2011
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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