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Abstract
Globally, concrete is the most widely used construction material. The composition of concrete plays an important role in controlling its overall performance. Concrete is composed of approximately 70%–80% aggregates, by volume. Therefore, it is mandatory to investigate the effect of aggregates on the performance of concrete. For this purpose, this study investigated the effect of three different coarse aggregates on the mechanical properties, durability, and microstructure of concrete. Concrete specimens were made using aggregates obtained from three regions with different mineralogies. The specimens were also made by replacing cement with silica fume. The specimens were analyzed in terms of compressive, flexural, and splitting tensile strengths, chloride penetration, carbonation, mercury intrusion porosimetry, and scanning electron microscopy. The results demonstrate that the specimens made with rougher coarse aggregates and silica fume had enhanced performance in comparison to those made with smoother aggregates.
Highlights
Concrete is the most widely used construction material in the world
The binder is the main ingredient of the concrete composition, which has a significant impact on the performance of cement composites
This study investigates the influence of different aggregate types and the addition of silica fume on the mechanical properties, durability, and microstructure of concrete
Summary
Concrete is the most widely used construction material in the world. Around 10 billion tons of concrete are produced annually worldwide [1]. This amount is expected to increase to about 18 billion tons per year by 2050 [2]. The composition of concrete plays a vital role in controlling the overall performance of the cement composites. The binder is the main ingredient of the concrete composition, which has a significant impact on the performance of cement composites. The binder is modified to obtain high-strength, high-performance concrete. For this purpose, supplementary cementitious materials (SCMs) are used to replace a portion of the cement.
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