Self-sealing of cracks in cementitious materials incorporating superabsorbent polymers under wet/dry cyclic conditions

Author(s): S. Choi, G. Hong and C. Song
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) New Generation of Construction Materials
Editor(s): Marijana Serdar, Nina Štirmer, John Provis
ISBN: 978-2-35158-217-6,
Vol 1. ISBN: 978-2-35158-223-7
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 617-621
Total Pages: 5
Language : English

Abstract: This study experimentally investigated the hysteretic behavior of crack self-sealing and self- healing in superabsorbent polymer (SAP)-added cementitious materials due to the repeated swelling/desweling of SAPs exposed to wet/dry cyclic conditions. Water flow test and image analysis were used to analyze both the short-term self-sealing by repeated swelling of SAPs and the long-term self-healing by internal curing of SAPs. The cement paste and mortar specimens including different dosages of SAPs were fabricated and the cracks were induced at the different ages of the specimens. The water flow test results showed that rapid swelling of SAPs by absorbing ingress water effectively sealed cracks in cementitious materials. From the point of view of a self-sealing, the reduction ratio of flow rate through cracks initially increased and then gradually converged as the wet/dry cycles repeated. From the point of view of a self-healing, meanwhile, the water runoff through cracks decreased as the cracks were healed by the internal curing of SAPs under wet/dry cyclic conditions. The results of this study suggest that SAPs are effective in both self-sealing and self-healing of cracks in the cementitious materials exposed to wet/dry cyclic environment.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00

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