COMPARATIVE STUDY OF ENGINEERING PROPERTIES OF FINE AGGREGATES FROM OMAMBALLA RIVER AND RIVER NIGER IN ANAMBRA STATE ON STRENGTH AND WORKABILITY OF CONCRETE

Okechukwu Kingsley Obi, Chukwurah H. Aginam, Peter D. Onodagu

Abstract


The Engineering properties of fine aggregates from Omamballa River (Sample 1) and River Niger (Sample 2) in Anambra State on strength and workability characteristics of concrete was investigated in this research. The physical properties of the two samples of fine aggregates were analyzed through sieve analysis, specific gravity test and moisture content test. Concrete mix was designed considering the properties of the investigated materials and workability test carried out. The ratio of 1:1.83:3.39:0.522 was used to produce 24 concrete cubes for a characteristic strength of 25N/mm2 for the two samples of fine aggregates. An average of three cubes was considered as the compressive strength at 7-, 14-, 21- and 28-days curing ages. From the results, variations in the physical properties of the two fine aggregate sources significantly impacted the workability and strength of concrete. Sample 1 is densely graded having wide range of sizes. Sample 2 is moderately graded with predominantly finer particles compared to Sample 1. The investigations proved that depending on their properties and compositions fine aggregates can impact differently on properties of concrete. The fine aggregate from River Niger Onitsha, due to its particle size distribution and moisture content had the highest slump value of 63mm. Fine aggregate from Omamballa River Aguleri had a slump value of 50mm. For compressive strength at 7, 14, 21 and 28days, fine aggregate from River Niger Onitsha gave; 15.17N/mm2, 24.4N/mm2, 29.43N/mm2 and 34.07N/mm2 while fine aggregate from Omamballa River gave; 14.17N/mm2, 23.77N/mm2, 28.7N/mm2 and 32.03N/mm2 respectively. This highlights the importance of careful selection of concrete materials to achieve desired strength and characteristics in concrete.

KEYWORDS: Strength, Workability, Physical properties, Fine Aggregates, Sample 1, Sample 2


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