ABSTRACT
Of the numerous studies that have investigated seashell waste as a substitute for aggregates and binders in concrete, only a fraction has considered them as coarse aggregates substitutes. This investigation examines the use of crushed Asian Hard Clam (Meretrix petechialis) shell waste as a partial replacement of coarse aggregates in M30 concrete. The replacement levels were 0 (control), 10, 20, 30 and 40%. The effects of these substitution levels on mechanical properties and concrete quality were examined through laboratory tests. Destructive tests showed that the shells had a negative impact on both compressive and splitting tensile strengths after 28 days of curing; the maximum reduction for both strengths was -29 and -26%, respectively. A similar outcome was recorded for concrete quality, which was determined by ultrasonic pulse velocity measurements. Nonetheless, all the mixes achieved acceptable quality, and the authors suggest use cases for the concrete type studied.
