INFLUENCE OF AGGREGATE SHAPE ON THE WORKABILITY AND STRENGTH DEVELOPMENT OF CONCRETE

Simon Iorshagher Akuha, Ifie-emi Francis Oseke, Ikierigha Lucky Ayebatonye

Abstract


This study investigates the effect of aggregate shape on the properties of concrete, focusing on key factors such as angular and rounded shaped coarse aggregates. The experiment involved preparing concrete specimens and analyzing the influence of the aggregates varying shapes on the workability and strength development through the slump and compressive strength tests respectively. The slump provided insight to measure the consistency and moisture content of fresh concrete before it is poured, which influences the workability. The compressive strength tests were conducted at 7, 14, and 28 days using a rebound hammer method to assess the load-bearing capacity of the concrete over time. The results indicated that aggregates with angular shapes contributed to higher slump value and compressive strengths due to improved interlocking between particles, leading to better load distribution. In contrast, rounded aggregates exhibited lower workability and compressive strength, likely due to a reduced ability to form stable particle networks. These findings underscore the importance of aggregate shape in optimizing concrete mix designs for enhanced structural performance. The study concludes that aggregate shape significantly influences the mechanical properties of concrete, with angular aggregates offering superior workable concrete and improved strength characteristics. The results have practical implications for construction practices, particularly in the selection of aggregates for concrete applications where improved mechanical credentials is critical
Keywords: Concrete, Workability, Coarse Aggregates and Compressive Strength
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References


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