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Cahyaning Kilang
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ANALISIS MEKANIS MORTAR DENGAN PENAMBAHAN SERBUK KACA DAN ARANG TEMPURUNG KELAPA Sastri Muliyati; Cahyaning Kilang; M. Ryan Iskandar
JURNAL ILMIAH NUSANTARA Vol. 2 No. 4 (2025): Jurnal Ilmiah Nusantara Juli
Publisher : CV. KAMPUS AKADEMIK PUBLISING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61722/jinu.v2i4.6023

Abstract

This study aims to determine the effect of adding glass powder and coconut shell charcoal on the density and compressive strength of mortar, as well as to obtain the optimum mixture composition of these waste materials as mortar additives. Glass powder contains high silica with pozzolanic properties, while coconut shell charcoal contains active chemical compounds that can improve the strength and density of mortar. The research method used is an experimental laboratory study with a mixture variation of 10% glass powder by weight of sand and 0%, 2%, 3%, 4%, and 5% coconut shell charcoal by weight of cement. Laboratory tests were conducted to measure the density and compressive strength of the mortar at the age of 14 and 28 days. The results of the study show that the best mixture variation is the combination of 10% glass powder and 3% coconut shell charcoal, which produced the highest compressive strength of 27.24 MPa at 14 days and 32.48 MPa at 28 days, higher than normal mortar. The highest density without additives was 1.95 g/cm³, while the lowest density at 14 days was found in the variation with 10% glass powder and 5% coconut shell charcoal 1.7 g/cm³. At 28 days, the highest density was 2.06 g/cm³ in the control (without additives), and the lowest was 1.82 g/cm³ in the mixture with 10% glass powder and 4% coconut shell charcoal. Thus, the combination of glass powder and coconut shell ash has been proven to improve the mechanical characteristics of mortar while utilizing waste materials with high added value.
STUDI EKSPERIMEN PENGARUH PERUBAHAN KADAR AIR TERHADAP NILAI CBR TANAH LEMPUNG DI LABORATORIUM Eufronia Herlian Sukacita; Cahyaning Kilang; Indra Suharyanto
JURNAL ILMIAH NUSANTARA Vol. 2 No. 5 (2025): Jurnal Ilmiah Nusantara
Publisher : CV. KAMPUS AKADEMIK PUBLISING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61722/jinu.v2i5.6045

Abstract

This study aims to determine the effect of water content variation on the California Bearing Ratio (CBR) value of clay soil through laboratory testing. Clay soil is a type of soil that is highly influenced by its water content, so any change in moisture level can affect its strength and bearing capacity. The tests were conducted on several soil samples with different moisture contents to determine the optimum water content that yields the maximum CBR value. The results showed that the highest CBR value of 19.23% was obtained at a water content of 39.24% before soaking, which was identified as the optimum moisture content. After a 4-day soaking period, the water content increased to 44.53% and the CBR value decreased, accompanied by a reduction in dry density from 1.02 g/cm³ to 0.93 g/cm³. This condition indicates that excessive water content can reduce soil density and particle cohesion, thereby decreasing the soil’s ability to withstand loads. Therefore, controlling moisture content is essential in construction planning, especially for clay soils that are highly sensitive to moisture changes.
Co-Authors Eufronia Herlian Sukacita Indra Suharyanto M. Ryan Iskandar Sastri Muliyati