Study the coupling agents of the common effect of adding high reactive mineral admixture meta-kaolin and super-plasticizer on the mechanical properties of lightweight concrete prepared by LECA aggregate

Abstract

The purpose of this paper is to look at how employing both super plasticizers and highly reactive meta-kaolin additives affects the compressive strength regarding LECAC lightweight expanded clay aggregate concrete in addition to various concrete parameters. The coarse-grained aggregate utilized was lightweight clay with maximum size of 10mm; the best percentages regarding chemical and mineral additives have been partial substitution of 10% cement for meta-kaolin mineral additives and 0.6 L / 100 kg cement for Super plasticizers. The percentages that have been gained from improved compressive strength (8.6, 20, and 17.6) % for processing ages have been 7, 28, and 56, respectively, in comparison with indicated level mix when meta-kaolin mineral admixture was only added to it, whereas the common effect of the two additives was evident in percentages (25.2, 29.4, 28) % for treatment ages 7, 28, and 56, in comparison with the mixture that has been indicated via the plane. For a concrete mix comprising additives, the equilibrium density attained was 1798 kg/m3 (ACI 213-R-03, < 1840 kg/m3 for structural purposes). Furthermore, the water absorption regarding LECA concrete was lowered through adding Meta kaolin (9.6 and 7.7) % at (28 and 56) days of curing, respectively, while addition of super plasticizer produces a rise in water absorption, and above-mentioned ratios that have been reduced to (5.8 and 2.1) % at such ages.