Properties of self-consolidating concrete containing expanded slate lightweight aggregate

Sadek, Mohamed M. (2020) Properties of self-consolidating concrete containing expanded slate lightweight aggregate. Masters thesis, Memorial University of Newfoundland.

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Abstract

This thesis aimed to evaluate the performance of self-consolidating concrete using either lightweight fine expanded slate aggregate (LF) or lightweight coarse expanded slate aggregate (LC). The rheological and mechanical properties of the lightweight self-consolidating concrete (LWSCC) mixtures were evaluated, in addition to the impact resistance and the durability (including abrasion and salt scaling resistance). The variables in this study included the type of lightweight aggregate (LF and LC), lightweight aggregate volume, binder content (500 kg/m³, 550 kg/m³ and 600 kg/m³), and types of concrete (LWSCC, normal weight self-consolidating concrete and lightweight vibrated concrete). The research program was divided into three stages. The first stage included optimization of LWSCC using expanded slate aggregate to obtain mixtures with minimum possible density (while achieving acceptable fresh properties) and mixtures having a target density of 2000 kg/m³ with maximized compressive strength. The second stage included investigation on the mechanical properties and impact resistance, while the third stage covered the assessment of the durability of the optimized mixtures. The results showed higher flowability for the LWSCC mixtures when LF was used compared to LWSCC mixtures with LC. However, LWSCC mixtures with LF required more high range water reducer admixture to reach the acceptable level of flowability compared to LWSCC mixtures with LC. The results also revealed that LWSCC mixtures with LF had higher mechanical properties, impact resistance and abrasion resistance before and after the exposure to salt scaling compared to LWSCC mixtures with LC at the same density level. Additionally, the results showed that the stability of the LWSCC mixtures (using LC or LF) enhanced by increasing the binder content. Increasing the binder content also allowed for using more lightweight aggregate, thus resulting in lower density mixtures.

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