Biebelemo. J. Jonathan, Dio A. Wenapere, and B.E. Yabefa
Abstract
The study investigated the use of ngolo (Rapana venosa) shell as a replacement for granite in concrete production. Granites are expensive, and Ngolo shells are available wastes in the environment. A manual size reduction technique, batching by weight method, particle size distribution of aggregates; strength properties tests were performed using 150mm cubes, 500mm x 100mm x 100mm beams and 200mm x 100mm cylinders with a mix ratio of 1:2:4, and demolded after 24hrs. The percentage replacement with Rapana venosa shells include; 0%, 10%, 20%, 30%, 40%, 50% and 100%. A total of 63 samples were produced and tested after 7, 14 and 28 days of curing respectively. The finesse modulus (3.6, 3.64, 3.33), uniformity coefficient (4.3, 3.33, 2.12) and coefficient of curvature of (2.78, 1.40, 1.55) were obtained for sand, granites and Rapana venosa shells respectively. Slump values (51, 57, 60, 53, 55, 50 and 49mm) were obtained for 0 – 100% replacement respectively. The compressive strength (29.07, 25.40, 25.03, 24.78, 23.30, 22.66, and 20.67 N/mm2), flexural strength (9.17, 8.66, 7.53, 7.40, 6.80, 5.72, and 4.74 N/mm2), Split tensile strength (7.87, 6.32, 5.77, 5.43, 4.49, 4.26, and 3.89 N/mm2) were obtained for 0 - 100% replacement respectively. The density and the strength properties of this concrete met the standard ACI 211.2 for light weight concrete requirement.
References
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