Juliana Ageng P, Sylvina Permatasari

ANALISI S KUAT TEKAN BETON FC 20 Mpa MENGGUNAKAN CAMPURAN METAKAOLIN DENGAN AGREGAT HALUS DESA KARANG BINTANG DAN AGREGAT KASAR DESA SUNGAI KACIL

Introduction

Analisi s kuat tekan beton fc 20 mpa menggunakan campuran metakaolin dengan agregat halus desa karang bintang dan agregat kasar desa sungai kacil. Analisis kuat tekan beton FC 20 MPa menggunakan metakaolin 20% & 25%. Peningkatan kekuatan beton teruji dengan agregat lokal Karang Bintang & Sungai Kacil.

Abstract

Penelitian terhadap kuat tekan beton dengan menggunakan campuran metakaolin, dengan menambahkan campuran metakaolin bervariasi sebanyak 20% dan 25% dicampur merata dengan bahan beton agregat kasar dari Desa Sungai Kacil dan agregat halus dari Desa Karang Bintang menggunakan semen Tiga Roda Tipe I. Dari hasil penelitian diketahui kuat tekan dengan perhitungan konversi dan tanpa perhitungan konversi pada beton berturut-turut, beton 0% konversi sebesar 22,645 MPa, beton konversi campuran metakaolin 20% sebesar 20,904 MPa, dan konversi beton campuran metakaolin 25% sebesar 24,097 MPa. Sedangkan perhitungan tanpa konversi pada beton berturut-turut, beton 0% tanpa perhitungan konversi sebesar 14,72 MPa, beton campuran metakaolin 20% tanpa perhitungan konversi sebesar 13,587 MPa dan beton campuran metakaolin 25% tanpa perhitungan konversi sebesar 15,663 MPa. Maka presentase kenaikan kuat tekan beton dari mutu yang direncanakan 20 f’c MPa dengan perhitungan konversi dan tanpa perhitungan konversi. Persentase perhitungan konversi beton 0% sebesar 13,225%, beton campuran metakaolin 20% sebesar 4,520% dan beton campuran metakaolin 25% sebesar 20,485%. Sedangkan untuk persentase perhitungan tanpa konversi beton 0% sebesar -26,400%, beton campuran metakaolin 20% sebesar -32,060% dan beton campuran metakaolin 25% sebesar -21,680%

Review

The study titled "ANALISI S KUAT TEKAN BETON FC 20 Mpa MENGGUNAKAN CAMPURAN METAKAOLIN DENGAN AGREGAT HALUS DESA KARANG BINTANG DAN AGREGAT KASAR DESA SUNGAI KACIL" investigates the impact of metakaolin on the compressive strength of concrete, targeting an fc' 20 MPa. The research specifically explores the effects of incorporating metakaolin at 20% and 25% by weight, utilizing local fine and coarse aggregates from Desa Karang Bintang and Desa Sungai Kacil, respectively, along with Tiga Roda Type I cement. This topic is highly relevant to material science and civil engineering, particularly in optimizing concrete properties and promoting the use of supplementary cementitious materials and local resources. The abstract presents a clear objective and provides key quantitative results regarding compressive strength. A notable strength of this work lies in its direct comparison of metakaolin dosages (20% and 25%) against a control mix (0% metakaolin). The findings indicate that, with "conversion calculations," the 25% metakaolin mix achieved the highest compressive strength of 24.097 MPa, significantly exceeding the target 20 MPa and showing a 20.485% increase. Even the 0% metakaolin mix, with conversion, surpassed the target (22.645 MPa). The use of local aggregates is also a commendable aspect, highlighting the practical applicability of the research for regional construction. Despite these promising findings, the abstract suffers from significant ambiguities that hinder a full understanding and evaluation of the research. The repeated mention of "perhitungan konversi" (conversion calculation) without any explanation is a major drawback; it is unclear what this conversion entails and why it yields substantially higher results compared to the "tanpa perhitungan konversi" (without conversion calculation) data. Furthermore, the "without conversion" results consistently fall well below the target 20 MPa (e.g., 14.72 MPa for the control mix), which requires extensive discussion and explanation within the main paper. Critical methodological details, such as the water-cement ratio, curing conditions, specimen dimensions, and age of testing, are conspicuously absent, making it impossible to assess the experimental design or reproduce the results. For this research to contribute effectively to the scientific literature, a comprehensive explanation of the methodology and a thorough discussion of both sets of results, clarifying the "conversion" aspect, are essential.

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