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Almeida, Fernando Do Couto Rosa
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document
Influence of internal curing admixture on hardening process of mortars with ground granulated blast-furnace slag (GGBS)
Abstract
Superabsorbent polymers (SAP) can be used as internal curing agent in order to control self-desiccation process in cementitious materials. This paper aims to evaluate the influence of SAPs on hardening process of PC-GGBS mortars. Different mortars combinations modified by GGBS and SAPs have been considered. Autogenous shrinkage, microstructural characteristics<br/>(MIP/SEM) and mechanical properties have been analyzed at 7, 14 and 28 days. The results showed that both studied SAPs can reduce autogenous shrinkage for all GGBS contents. In particular SAP with low water absorption capacity can even lead to prior expansion of mortars, in particular for lower GGBS contents. It confirms that kinetics of SAP sorption plays a critical role in the<br/>hardening process. Although it increases total porosity, SAP addition can decrease pore sizes and reduce pores interconnectivity. Therefore, the type of SAP strongly influences progress of curing process, especially when different GGBS concentrations are considered.