Effect of Mineral Admixture, W/B Ratio and Elevated Temperature on Strength of Lightweight Expanded Clay Aggregate Concrete

Abstract

Abstract: The present paper focused on development of
structural lightweight concrete by using light weight expanded
clay aggregate (LECA) with unit weight of 1700 kg/m3 to 1900
kg/m3 and compressive strength of 40 MPa. In this study,
investigation was done using LECA as coarse aggregate in
concrete by replacing normal aggregate in three differing
volume fractions i.e., 30%, 40% and 50% with different w/b
ratios 0.40, 0.50 and 0.60 to produce lightweight expanded clay
aggregate concrete (LECAC) with addition of chemical
admixture. For that, concrete mix design was done using IS
method and replacement of lightweight aggregate was
calculated based on volume batching. The effect of mineral
admixture (i.e., 10% microsilica) on the properties of
lightweight expanded clay aggregate concrete and normal
weight aggregate concrete such as workability of fresh
concrete, compressive strength and flexural strength of
concrete were compared. The studies also include the effect of
elevated temperature on light weight expanded clay aggregate
concrete and normal weight aggregate concrete.
Index Terms: Normal weight aggregate concrete (NWAC),
Light weight expanded clay aggregate (LECA). Light weight
expanded clay aggregate concrete (LECAC), Elevated
temperature.