Abstract
: Lateritic stones abound in the tropical and semi tropical areas of the world more than the igneous and other standard rocks that are used as concrete aggregates and road chippings. The increasing utilization of natural aggregate for concrete production have created negative impact on the environment. Therefore searching for alternative material which has potential to replace the use of coarse aggregate from normalrocks in concrete mix either wholly or partially is very much in need. This research presents the engineering properties of concrete containing lateritic aggregate as partial coarse aggregate replacement. The coarse aggregate was replaced by 10, 20, 30, 40 and 50% with lateritic aggregate. All the specimens were cured and compressive strength test were carried out at the age of 7, 14, 21 and 28 days respectively. The result revealed that replacement of lateritic aggregate up to 30% was able to produce lateritic concrete exhibiting the target strength which is 30 N/mm2. However, the slump decreases as the percentage of lateritic aggregate in the mix increases, this may be due to the porosity of the lateritic aggregate due to absorption of the water in the mix. The result of the two way analysis of variance shows that both lateritic aggregate and curing age (days) has significant effects of the compressive strength of concrete. Keywords : Lateritic stone, Cement, Concrete, Compressive strength
Highlights
Concrete has replaced most of other competitive construction materials, because of its versatility, and easy availability
Suitable material should be found to replace the use of granite aggregates, to prevent this problem.The availability of laterite aggregate has initiated research to investigate the possibility of using this material as partial coarse aggregate replacement in concrete production
The results revealed that replacement of laterite aggregate up to 30% is able to produce laterite concrete which met the requirements for use as structural lightweight concrete (ACI, 211.2 (2003)). which is between 21 – 35 N/mm2 at 28 days curing age and the targeted grade strength which is 25 N/mm2
Summary
Concrete has replaced most of other competitive construction materials, because of its versatility, and easy availability. Construction in Nigeria uses mostly concrete because it is cheap and made using locally available material. Aggregates have a pronounced influence on the properties of fresh as well as hardened concrete.The most common types of aggregate generally used for making concrete in Nigeria are crushed granite. Suitable material should be found to replace the use of granite aggregates, to prevent this problem.The availability of laterite aggregate has initiated research to investigate the possibility of using this material as partial coarse aggregate replacement in concrete production. The aim of this study is to know the effects of partial replacement of coarse aggregate with lateritic stone in concrete production, and a suitable percentage that can replace it
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