Autor(a/res): Viktor Mechtcherine, Michaela Gorges, Christof Schroefl, Alexander Assmann, Wolfgang Brameshuber, António Bettencourt Ribeiro, Daniel Cusson, João Custódio, Eugênia Fonseca da Silva, Kazuo Ichimiya, Shin-ichi Igarashi, Agnieszka Klemm, Konstantin Kovler, Anne Neiry de Mendonça Lopes, Pietro Lura, Van Tuan Nguyen, Hans-Wolf Reinhardt, Romildo Dias Toledo Filho, Jason Weiss, Mateusz Wyrzykowski, Guang Ye e Semion Zhutovsky. 

Resumo: The article presents the results of a round-robin test performed by 13 international research groups (representing fifteen institutions) in the framework of the activities of the RILEM Technical Committee 225-SAP “Applications of Superabsorbent Polymers in Concrete Construction”. Two commercially available SAP materials were used for internal curing of a high-performance, fine-grained concrete in combination with the addition of extra water. The concrete had the same mix composition in all laboratories involved but was composed of local materials. All found a considerable decrease in autogenous shrinkage attributable to internal curing. Also, with regard to the shrinkage-mitigating effect of both particular SAP materials, the results were consistent. This demonstrates that internal curing using SAP is a robust approach, working independently of some variations in the concretes’ raw materials, production process, or measuring technique. Furthermore, the effects of internal curing on other properties of concrete in its fresh and hardened states were investigated. These are consistent as well and expand considerably the existing data basis on properties of concrete materials containing SAP.

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