Do Couto Rosa Almeida, Fernando

Klemm, Agnieszka

English

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 slowdown 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 shrinkagetriggered 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 selectedmechanical 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 waterabsorption 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 thereference 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

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

https://researchonline.gcu.ac.uk/ws/files/27638696/AlmeidaKlemm_DBMC_245_full_paper.pdf

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

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