Effects of Jujube Seed on the Mechanical Properties of the Normal Strength Concrete
The effects of jujube seed (JB) as partial replacement of coarse aggregate in concrete production was investigated. Physical properties of jujube seed and coarse aggregate were evaluated and compared. The concrete mix proportion of ratio 1:2:4 was adopted in the study. A total of 45 concrete cube specimens of size 150 × 150 ×150 mm3 with various percentages replacement by weight of coarse aggregate to jujube seeds as coarse aggregate in the order 5%, 10%, 15%, and 20% water cured for a maximum of 28 days. The densities and compressive strengths of the reference sample and the concretes mixed with partial replacement were evaluated. The results showed no significant change in concretes' densities with the partial replacement of aggregate up to 20%. The compressive strength of specimens with percentage replacement of coarse aggregate with jujube seeds at 20% for 7, 14, and 28 days curing age was found to be 6.7 MPa, 11.3 MPa, and 21.6 MPa, respectively. This shows that the compressive strengths at 28 days curing are entirely satisfactory within the range of compressive strength requirements of plain and reinforced concrete structure. The Jujube Seeds could partly be used to replace coarse aggregate up to 20% in the production of concrete where it is easily accessible and can be recommended as an alternative material to coarse aggregate mostly in tropical Africa and Asia region.
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