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All Journal Jurnal Pendidikan Sosiologi Undiksha Construction and Material Journal
Wattini, Wattini
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Journal : Construction and Material Journal

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Pemanfaatan Tanah Gambut Sebagai Bahan Campuran Tanah Laterit Ditinjau Dari Nilai CBR (California Bearing Ratio) Hesar, Annisa Fitria; Saputri, Anzeli; Rafani, Muhammad; Wattini, Wattini
Construction and Material Journal Vol. 7 No. 1 (2025): Construction and Material Journal Vol. 7 No. 1 Mei 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v7i1.7119

Abstract

West Kalimantan, particularly the city of Pontianak, is known for its abundant peat soil reserves. Peat soil forms from the accumulation of organic material derived from decomposed vegetation under water-saturated conditions. In construction, the use of local materials such as peat soil can be a strategic alternative to reduce project costs and minimize environmental impact. In this study, peat soil was utilized as an additive in laterite soil mixtures intended for subgrade applications. The purpose of using peat is to reduce construction costs and minimize negative environmental impacts. This research aims to determine the effect of varying peat content—10%, 20%, 30%, 40%, and 50%—on the California Bearing Ratio (CBR) of laterite soil. The results show that the CBR value of natural laterite soil is 32.69%. When mixed with 10% peat, the CBR decreases to 12.53%; at 20%, it drops to 10.25%; at 30%, it further reduces to 6.8%; and at 40%, it falls to 4.56%. For mixtures containing 50% or more peat, no measurable CBR value was obtained. These findings indicate a significant reduction in bearing capacity as peat content increases.
Perbandingan kuat tekan beton menggunakan pasir pantai dengan bahan aditif dan tanpa aditif serta perendaman air tawar dan air laut Harits, Emil; Satria, Muhammad Fiqri; Wattini, Wattini; Utomo, Satriyo
Construction and Material Journal Vol. 7 No. 1 (2025): Construction and Material Journal Vol. 7 No. 1 Mei 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v7i1.7362

Abstract

This study evaluates the effect of silica fume additives on concrete compressive strength and concrete characteristics. Silica fume is known to improve the quality of concrete through pozzolanic reactions that improve microstructure and reduce porosity. In this study, concrete with silica fume content of 6%, 7%, 8%, and 9% of the weight of cement was produced and tested. Testing was carried out at the age of 14 days to assess the compressive strength of concrete and concrete density. With the maximum increase recorded in the mixture with 8% silica fume in construction, concrete is an important component. This study indicates that the addition of silica fume additives to concrete can increase the compressive strength of the material. Based on this, ordinary concrete is not very resistant to sulfuric acid solutions found in seawater. After 14 days of immersion, the effects of sulfuric acid began to reduce the compressive strength of concrete in both freshwater and seawater, with normal concrete dropping from 19.60 MPa to 19.42 MPa, 6% silica fume concrete in freshwater from 20.04 MPa to 19.91 MPa, seawater concrete with 7% silica fume from 20.09 MPa to 19.95 MPa, with 8% silica fume from 20.22 MPa to 20.10 MPa, and with 9% silica fume from 20.18 MPa to 20.06 MPa. In conclusion, silica fume additives can increase the compressive strength of concrete; the higher the percentage of silica fume additives used, the higher the compressive strength.
Co-Authors Drs. I Wayan Mudana,M.Si. . Harits, Emil Hesar, Annisa Fitria M.Si Drs. I Ketut Margi . Rafani, Muhammad Saputri, Anzeli Satria, Muhammad Fiqri Utomo, Satriyo