Flexural Strength and Water Absorption of Concrete made from Uniform Size and Graded Coarse Aggregates
Journal Title: American journal of Engineering Research - Year 2017, Vol 6, Issue 10
Abstract
Concrete flexural strength and water absorption play critical role in pavement cracking and deterioration. Loss of flexural strength of concrete is largely responsible for the failure of concrete pavement and other concrete structures. Flexural strength is an input in empirical-mechanistic design of pavement and should be considered while choosing aggregates for concrete production. The use of uniform size aggregates or aggregates containing different sizes in making concrete for rigid pavement and other concrete structures necessitated this research. The study investigated four sets of concrete samples made from aggregates of uniform sizes of 9.5mm, 12.7mm, 19.1mm and samples made from a combination of 9.5mm, 12.7mm and 19.1mm aggregates using the Cement Treated Aggregate gradation procedure. A concrete mix of 1:1.5:3 with a constant water-cement ratio (w/c) of 0.6 was used. Concrete flexural beams were produced, cured and flexural strength test carried out at 14 and 28 days. Water absorption test was also carried on a set of beams at 28 days. The result showed that the concrete made from aggregate sizes of 9.5mm, 12.7mm and 19.1mm recorded average flexural strengths of 2.96N/mm2 , 3.20N/mm 2 and 3.29N/mm2 at 14 days; and 3.20N/mm2 , 3.35N/mm2 and 3.40N/mm2 at 28 days respectively. However, the combined (graded) aggregates recorded the least flexural strength of 2.45N/mm2 and 3.12N/mm2 at 14 and 28 days respectively. Also, concrete made from aggregate sizes of 9.5mm, 12.7mm and 19.1mm recorded average water absorption of 5.5%. 4.95% and 3.4% respectively, while concrete made from the graded aggregates recorded average water absorption of 2.1% at 28 days. It was concluded that that flexural strength of concrete made from uniform size aggregates increases with increase in aggregate size and that aggregates graded using the Cement Treated Aggregate gradation procedure resulted in concrete of lower flexural strength relative to those produced using uniform size aggregates. It was also conclude that concrete made from graded aggregates improved water absorption relative to concrete made from uniform size aggregates.
Authors and Affiliations
Ekwulo E. O1 . , Eme D. B2
Keywords
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