Author(s) :

E.N. OGORK, T. A. IBU.

Volume/Issue :

Abstract :

This paper presents a research into the use of locust bean pod powder (Makuba) as an additive in concrete. Makuba is a powdery product obtained from Locust bean pod when pounded. It is found mainly in the Northern part of Nigeria with scientific name Perkia Filicoidea. Two grades of Concrete (20 and 30) were investigated to determine the suitability of Makuba as an additive in Concrete. To each grade of Concrete, Makuba was added in varying concentration of 0%, 2.5%, 5.0% and 10% cured in water and tested for compressive strength after a period of 7, 28 and 56 days respectively. The chemical analysis carried out on Makuba showed that Makuba contains at least 15 elements. Ranking top are: Magnesium (24%), Potassium (20%), Calcium (17%), Aluminum (15%), Sodium (12%), Chlorine (10%), Radium (1%) and others below 1% in concentration. The results on the compressive strength of the concrete samples revealed generally a decrease in strength for every increase in Makuba content. However, there was a progressive increase in strength with age up to 56 days. Moisture absorption test also carried out had revealed a corresponding increase in the moisture absorption with the percentage addition of Makuba for both grades of Concrete. It has also revealed that grade 20 concrete absorbed more moisture than grade 30 Concrete. Makuba is therefore not considered suitable as additive in concrete at percentages considered.

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