Nofvim Eric Prandika, Synsya Ealiah Azzahra, Agung Kristiawan, Putri Anggi P. S.

ANALISIS KUAT TEKAN BETON MUTU K 200 DENGAN BAHAN CAMPUR FOAMING AGENT, SUPERPLASTICIZER (SIKACIM), DAN FLY ASH

Introduction

Analisis kuat tekan beton mutu k 200 dengan bahan campur foaming agent, superplasticizer (sikacim), dan fly ash. Analisis kuat tekan beton K200 dengan bahan campuran foaming agent, superplasticizer (Sikacim), dan fly ash. Temukan beton ringan optimal berdaya tekan tinggi di usia 14 & 21 hari.

Abstract

Concrete technology innovations need to be made to improve or correct weaknesses and improve the quality standards of the concrete produced. The technology and innovation that has been developed is lightweight concrete. This research aims to find lightweight but high compressive strength concrete (optimal concrete) at K200 concrete grade. With mixed materials for concrete in the form of foam agent, superplasticizer, and fly ash, the tolerance limit for mixing materials at the age of 14 days and 21 days of concrete with experimental methods with cube-shaped samples. Based on the purpose of this study, namely looking for lightweight concrete but high compressive strength (optimal concrete) in this study the average foam 15%, superplasticizer 1.5, fly ash 10% age 14 days with an average of 254.74 kg / cm² and average foam 15% superplasticizer 1.5%, fly ash 10% age 21 days average compressive strength 225.87 kg / cm².

Review

This manuscript presents an investigation into optimizing K200 grade concrete by incorporating foaming agent, superplasticizer (Sikacim), and fly ash to achieve a lightweight yet high-compressive-strength material. The research aims to address the common challenge in concrete technology of developing materials that are both lightweight and robust. Employing an experimental method with cube-shaped samples, the study focuses on evaluating the compressive strength at 14 and 21 days. The chosen combination of admixtures is relevant to current trends in sustainable construction and material science, demonstrating an effort to innovate within traditional concrete formulations. The primary strength of this research lies in its clear objective to develop optimal concrete with enhanced properties through material innovation. The abstract reports specific findings, indicating that a mix proportion of 15% foam, 1.5% superplasticizer, and 10% fly ash yielded average compressive strengths of 254.74 kg/cm² at 14 days and 225.87 kg/cm² at 21 days. These results, particularly the 14-day strength, appear to surpass the target K200 (approximately 16 MPa or 163 kg/cm²) significantly, suggesting a successful improvement in strength. The use of a superplasticizer and fly ash is a well-established method for improving workability and long-term strength, while the foaming agent directly addresses the lightweight aspect. However, several critical aspects require further clarification and detail to fully evaluate the contribution of this work. Crucially, while the abstract repeatedly mentions "lightweight concrete," no data regarding the density or unit weight of the concrete samples is provided. This omission makes it impossible to assess if the concrete truly achieved a lightweight status, which is a core objective. Furthermore, the reported decrease in compressive strength from 14 days (254.74 kg/cm²) to 21 days (225.87 kg/cm²) is highly unusual and counter-intuitive for concrete; this discrepancy needs a thorough explanation, potentially indicating an experimental anomaly or specific interaction between the materials that warrants detailed discussion. A control mix (K200 without admixtures) would also be essential for a robust comparison to quantify the actual impact of the additives. Addressing these points would significantly strengthen the paper's scientific rigor and the validity of its conclusions regarding "optimal concrete."

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