Efficiency of internal curing by superabsorbent polymers (SAP) in PC-GGBS mortars |
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| Affiliation: | 1. College of Civil and Transportation Engineering, Hohai Univ., No. 1, Xikang Rd., Nanjing 210098, China;2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji Univ., No. 1239, Siping Rd., Shanghai 200092, China;3. Nanjing Construction Group CO., Ltd, No. 200, Ruanjian Avenue., Nanjing 210012, China;1. Department of Civil Engineering, Gangneung-Wonju National University, Jukheon-gil 7, Gangneung-si, Gangwon-do 25457, Republic of Korea;2. Research Institute for Disaster Prevention, Gangneung-Wonju National University, Jukheon-gil 7, Gangneung-si, Gangwon-do 25457, Republic of Korea;3. Construction Technology Research Center, Korea Conformity Laboratories, Gasan Digital 1-ro, Geumcheon-gu, Seoul 08503, Republic of Korea;1. College of Civil and Transportation Engineering, Hohai Univ., No. 1, Xikang Rd., Nanjing 210098, China;2. Jiangsu Engineering Research Center of Crack Control in Concrete, No. 1, Xikang Rd., Nanjing 210098, China;3. Nanjing Construction Group CO., Ltd, No. 200, Ruanjian Avenue, Nanjing 210012, China |
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| Abstract: | This paper evaluates the effect of superabsorbent polymers (SAP) on hydration and microstructure of PC-GGBS mortars. Development of autogenous shrinkage, microstructural characteristics (MIP/SEM) and compressive strength were analysed during the first 90 days. Four levels of Portland cement (PC) replacement by GGBS (0%, 25%, 50% and 75%) and two types of SAP with different water absorption capacities were considered. The results proved the efficiency of internal curing by SAPs in PC-GGBS systems due to significant reduction in autogenous shrinkage, especially for higher contents of GGBS. SAP facilitates GGBS hydration activated by portlandite; its products can be deposited into the nano pores leading to a small relative expansion of the hardened bulk volume. This process is initiated during the second week and it lasts until the sixth week. Despite increased total porosity, compressive strength of SAPs modified mortars is comparable to the reference samples for low GGBS contents in advanced ages. |
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| Keywords: | Superabsorbent polymers (SAP) Ground granulated blast-furnace slag (GGBS) Mortars Autogenous shrinkage Microstructure |
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