The effect of superabsorbent polymers on the mitigation of plastic shrinkage cracking of conventional concrete, results
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ORIGINAL ARTICLE
The effect of superabsorbent polymers on the mitigation of plastic shrinkage cracking of conventional concrete, results of an inter-laboratory test by RILEM TC 260-RSC William Boshoff . Viktor Mechtcherine . Didier Snoeck . Christof Schro¨fl . Nele De Belie . Anto´nio Bettencourt Ribeiro . Daniel Cusson . Mateusz Wyrzykowski . Nikolajs Toropovs . Pietro Lura
Received: 27 March 2020 / Accepted: 16 June 2020 RILEM 2020
Abstract This article presents the results of an interlaboratory study performed by six international research groups in the framework of RILEM Technical Committee 260 RSC ‘‘Recommendations for use of superabsorbent polymers in concrete construction’’. Two commercially available superabsorbent polymer (SAP) samples with different chemical compositions were tested in terms of their ability to mitigate plastic shrinkage cracking of concrete. The SAP mixtures The study reported in this paper was performed within the framework of the RILEM TC 260 RSC ‘‘Recommendations for Use of Superabsorbent Polymers in Concrete Construction’’. The paper was reviewed and approved by all members of the RILEM TC 260-RSC.
showed a clear reduction of plastic shrinkage cracking in conventional concrete. On the contrary, if only additional water is added and no SAP, the area of plastic shrinkage cracks increases. This suggest the ability of SAP to mitigate plastic shrinkage cracking. Upon addition of the predetermined amount of SAP and additional water, the compressive strength decreased on average by 3% for the mixtures with 0.15% SAP (by mass of cement) and by 10% for the mixtures with 0.30% SAP. Keywords Plastic shrinkage Inter-laboratory test Superabsorbent polymer Hydrogel Plastic shrinkage cracking Concrete SAP
TC Membership: TC Chair: Viktor Mechtcherine
1 Introduction
Deputy TC Chair: Mateusz Wyrzykowski
Superabsorbent polymers (SAP) are relatively new concrete admixtures with many advantages [1, 2]. The main reason why SAP were first investigated is their ability to reduce autogenous shrinkage of cementbased building materials [3–5]. The reduction of autogenous shrinkage lowers the risk of cracking if the member is restrained (internally or externally). Hence, the application of SAP is especially beneficial in
Members: Livia Borba Agostinho, Fernando C.R. Almeida, Alexander Assmann, William P Boshoff, Daniel Cusson, Joa˜o Custo´dio, Nele De Belie, Igor De la Varga, Kendra Erk, Vyatcheslav Falikman, Stefan Friedrich, Kazuo Ichimiya, Shin-Ichi Igarashi, Patricia Kara De Maeijer, Kamal H. Khayat, Agnieszka J. Klemm, Pietro Lura, Juhyuk Moon, Michaela Reichardt, Hans W. Reinhardt, Anto´nio Bettencourt Ribeiro, Christof Schroefl, Didier Snoeck, Nikolajs Toropovs, Chiara Villani. W. Boshoff (&) University of Pretoria, Pretoria, South Africa e-mail: [email protected]
V. Mechtcherine C. Schro¨fl Technische Universita¨t Dresden, Dresden, Germany
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cementitious systems with low water-to-binder ratios (w/b), such as h
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