Microstructure alterations of PC-GGBS mortars by superabsorbent polymers (SAP)

Fernando Do Couto Rosa Almeida, Agnieszka Klemm

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

Despite its worldwide popularity, the use of blended cements, such as, ground granulated blast-furnace slag (GGBS), requires a special attention predominantly due to their capacity to slow
down cement reactions. Superabsorbent polymers (SAP), in turn, can be used as an internal curing agent to enhance durability of cement-based composites by mitigating autogenous shrinkage
triggered by self-desiccation process. The paper aims to evaluate the effect of SAPs addition on microstructure of GGBS-PC mortars. Development of microstructural characteristics and selected
mechanical properties 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 showed that SAP with higher water absorption capacity is able to develop larger pores after 28 days for any GGBS content. SAP can also facilitate GGBS hydration and its later products can be deposited into the smaller nano pores. Despite increased total porosity, mechanical strength of SAP modified mortars is comparable to the
reference samples for low GGBS contents in advanced ages. Therefore, the type of SAP and concentration of GGBS play a considerable role in microstructure alteration of mortars.
Original languageEnglish
Title of host publication14th International Conference on Durability of Building Materials and Components. Proceedings PRO 107
Place of PublicationParis
PublisherRILEM
Pages205-216
Number of pages12
ISBN (Electronic)9782351581599
Publication statusPublished - 31 May 2017

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    Do Couto Rosa Almeida, F., & Klemm, A. (2017). Microstructure alterations of PC-GGBS mortars by superabsorbent polymers (SAP). In 14th International Conference on Durability of Building Materials and Components. Proceedings PRO 107 (pp. 205-216). RILEM.