The use of Senilia senilis seashells as a substitute for coarse aggregate in eco-friendly concrete. (November 2020)

• Record Type: Journal Article
• Authors: Bamigboye, Gideon O.; Okara, Odochi; Bassey, Daniel E.; Jolayemi, Kayode J.; Ajimalofin, David
• Is Part Of: Journal of building engineering. Volume 32(2021)
• Publication Date: 2020-11
• Subjects: Sustainable materials -- Compressive strength -- Building materials -- Concrete -- Seashells -- Cement; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2020.101811
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: This research appraised the effects of recycling senilia senilis waste seashells as a full or partial substitution for natural coarse aggregate (granite) in eco-friendly concrete production. The design mix employed a 1:2:4 concrete mix ratio for M25 grade, a w/c ratio of 0.5, river sand as fine aggregate, ordinary Portland cement (OPC) as a binder, and varying proportions of crushed seashells and granite as coarse aggregates (0:100, 10:90, 20:80, 30:70, 40:60, and 50:50). Laboratory tests revealed that workability requirements were only met with a 10%–40% seashell addition, workability decreased with increasing seashell percentages. The compressive strength increased with curing age but decreased with the additions of seashells. The seashell-modified mixes failed to reach the design target strength for M25 concrete. Nonetheless, the 10 and 20% seashell-modified mixes achieved the required strength for M20 concrete. Split tensile strength increased with curing age for all mixes, the seashell-modified mixes yielded slightly reduced tensile strength values compared to the unmodified mix at all curing stages. However, the 10%, 30%, and 40% seashell-modified batches attained recommended split tensile strength values on the 28th day. Furthermore, high correlations were observed between the datasets of the some of the measured parameters, and variations for Split tensile strength as a function of seashell percentage and compressive strength were developed discretely by fitting the experimental data to the numerical models. Relationships were also developed for compressive strength and workability as functions of seashell percentage. Eco-friendly building construction recycling waste seashells is encouraged as it offers positive economic and environmental prospects. Highlights: Senilia senilis was used as partial replacement for natural coarse aggregates (granite). This study showcased the need for eco-friendly concrete production towards sustainable development. The study highlights the concepts of green-concreting practices and illustrates the issues responsible for its necessity.