Assessment of Strength Characteristics of Concrete Made from Locally Sourced Gravel Aggregate from South-South Nigeria
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SCIENCEDOMAIN international
Abstract
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Aims: The aim of this research is to verify the suitability of local gravel aggregates obtained from
the Southern part of Akwa Ibom State for designed concrete production in place of crushed granite
aggregate sourced from distance places at exorbitant cost. This paper assesses the strength
characteristics of concrete made from two locally sourced gravel aggregates of 10 mm and 20 mm
maximum sizes.
Study Design: Three samples of gravels divided into washed and unwashed gravels were used for
the research. Concrete mix design of 25 N/mm2 at 28 days of curing was the target mean strength
of the research.
Place and Duration of Study: Department of Civil Engineering, Covenant University, Ota –
Nigeria, between September 2014 and July 2015.
Methodology: Particle size distribution test, specific gravity test, water absorption test, aggregate crushing value test, flakiness and elongation tests, slump test, compressive strength test were
performed on the samples. Concrete cubes150 mm were cast for each gravel size and three
specimen tested for 3, 7, 14, 21 and 28 days compressive strength.
Results: The washed gravels with 10 mm and 20 mm maximum size reached the target mean
strength with 29.7 N/mm2 and 26.2 N/mm2 respectively while the unwashed gravel with 20 mm
maximum size yielded a compressive strength of 24.5 N/mm2 at 28 days.
Conclusion: The results prove that the size, grading, internal bonding and deleterious material
contribute immensely to the strength of concrete made from gravel aggregate
Keywords
TA Engineering (General). Civil engineering (General)