JOURNAL OF MATERIALS & CONSTRUCTION
ISSN: 2734-9438
Website: www.jomc.vn
Partial replacement of natural sand with recycled waste oyster shells in concrete production of grade 30 MPA
Abstract
In the construction industry, concrete is a vital material, and natural sand is an essential aggregate component. However, natural sand resources are currently becoming increasingly scarce due to excessive exploitation. Furthermore, oyster shells, a waste product from aquaculture and seafood processing, are difficult to decompose and contribute to environmental pollution. Consequently, investigating the utilization of finely crushed waste oyster shells to partially substitute natural sand in concrete production represents a promising and necessary approach, simultaneously mitigating pollution and effectively utilizing available waste streams. In the present study, oyster shells were finely ground and used to replace natural sand at substitution ratios ranging from 5% to 20%. The results, based on measurements of slump, compressive strength, and water absorption of the concrete, conducted in accordance with Vietnamese standards, indicate that the crushed shell is capable of replacing up to 15% of the natural sand while maintaining the requisite properties and technical specifications of the concrete.
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