PENGARUH PENGARUH CAMPURAN LIMBAH ABU SERABUT KELAPA DAN SERBUK CANGKANG KERANG DARA TERHADAP KUAT TEKAN DAN RETAK BETON

Nur Azizah Affandy; Hisma Raya; Bobby Damara

doi:10.24929/ft.v14i2.5295

Nur Azizah Affandy Program Studi Teknik Sipil Fakultas Sains dan Teknologi Universitas Islam Lamongan
Hisma Raya Program Studi Teknik Sipil Fakultas Sains dan Teknologi Universitas Islam Lamongan
Bobby Damara Program Studi Teknik Sipil Fakultas Sains Dan Teknologi Universitas Islam Lamongan

DOI: https://doi.org/10.24929/ft.v14i2.5295

Keywords: Coconut Fiber Ash, Blood Clam Shell Powder, Concrete, Compressive Strength, Crack Pattern

Abstract

This study investigated the effects of Coconut Fiber Ash (CFA) as a partial cement replacement and Blood Clam Shell Powder (BCSP) as a partial fine aggregate replacement on the compressive strength and crack characteristics of concrete with a target strength of 25 MPa. A laboratory experimental method was employed using three mixtures: normal concrete (V₀), V₁ (2% CFA and 5% BCSP), and V₂ (3% CFA and 10% BCSP). Cylindrical specimens measuring 150 mm in diameter and 300 mm in height were tested at 7 and 28 days. The evaluated parameters included slump, compressive strength, and crack length. At 28 days, the average compressive strengths of V₀, V₁ and V₂ were 25.50, 32.24, and 29.77 MPa, respectively. Compared with normal concrete, V₁ and V₂ increased compressive strength by 26.43% and 16.75%, respectively. V₁ also exhibited an average crack length of 22.33 mm at 28 days, which was shorter than that of V₂ (27.33 mm). Among the mixtures investigated, V₁ demonstrated the best performance in terms of compressive strength and crack length at 28 days. These findings provide preliminary evidence of the potential use of CFA and BCSP as alternative materials in concrete production. Further research should investigate a wider range of replacement levels, assess the individual effects of each material, and evaluate concrete durability.

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