Effect of Super absorbent polymer on workability, strength and durability of Self consolidating concrete

This study presents the effect of super absorbent polymer (SAP) as internal curing agent on workability, durability and compressive strength of self-consolidating concrete (SCC). In order to estimate the internal curing efficiency of SAP in different curing conditions and curing ages, compressive strength and electrical resistivity tests have been performed. Homogenous and denser microstructure was formed by gradual release of water from SAP into pores created by SAP. Further pozzolanic reaction of fly ash has enhanced the strength and durability properties. High desorption rate of water from SAP in air curing condition resulted in an increased electrical resistivity and compressive strength. Compressive strength of internal cured SCC mixtures increased to ۱۵-۲۵% at ۷ days and ۱۰-۱۹% at ۲۸ days. Electrical resistivity values were increased ۱۱-۳۰% in water curing condition and ۱۶-۵۳% in air curing condition. The costs for ۰.۳۵w/b and ۰.۴۰ w/b at optimum internal cured SCC mixtures compared to control SCC mixtures were reduced to ۹.۳۹ and ۹.۷۰%, respectively.

کلیدواژه ها:

Internal curing ، Super absorbent polymer ، Self consolidating concrete ، Electrical resistivity ، Compressive strength