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All Journal INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY
Lisa Oksri Nelfia
Department of Civil Engineering and Planning, Faculty of Civil Engineering and Planning, Universitas Trisakti, Jakarta, Indonesia
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Energy Environmental Science

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INVESTIGATION OF MECHANICAL CHARACTERISTICS OF LIGHTWEIGHT CONCRETE USING ENVIRONMENTALLY FRIENDLY LIGHTWEIGHT AGGREGATES Lisa Oksri Nelfia; Nazifa Sekarningtyas; Agung Sumarno; Astri Rinanti; Ouali Amiri
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 7, NUMBER 2, OCTOBER 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v7i2.19715

Abstract

This study aims to investigate the mechanical properties of lightweight concrete using lightweight aggregate and analyze the impact of silica fume on enhancing its compressive strength. The main objective of this study was to improve the value of industrial waste by utilizing GGBFS as a substitute for cement. Four alternative compositions have been used to produce samples of lightweight concrete. The coarse aggregate is substituted with 100% lightweight expanded clay aggregate, whereas the fine aggregates are replaced with 100% vermiculite and 100% polystyrene bead waste.                                A combination of 20% GGBFS and 10% silica fume is employed for cement replacement. The materials used throughout this study consist of aluminum powder and superplasticizer. The workability, compressive strength, tensile strength, and specific gravity of concrete will be determined by testing.                  The waster curing will be carried out on cylindrical concrete specimens 200 mm in height and 100 mm in diameter. Experimental results showed that the concrete mixture consisting of 80% cement and 20% GGBFS as binders, along with lightweight expanded clay aggregate as coarse aggregate and vermiculite as the fine aggregate, exhibits the highest compressive strength compared to other lightweight concrete mixtures.
Sustainable Utilization of Industrial Solid Waste in Lightweight Concrete Blocks to Support Environmentally Friendly Cities Lisa Oksri Nelfia; Mindy Barend Wiguno; Krisma Adijaya Adijaya; Yohans Sunarno; Ouali Amiri
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 9, NUMBER 1, APRIL 2026
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v9i1.24256

Abstract

Aim: This study aims to evaluate the influence of gold tailings waste (GTW), nickel slag (NS), and rejected plastic (RP) as partial substitutes for cement and fine aggregates on the mechanical and physical properties of lightweight concrete blocks for sustainable construction applications. Methodology and Results: GTW was substituted at 5% by weight of cement, while NS and RP replaced fine aggregates at variations of 10–20% and 10–15%, respectively. Concrete specimens were cast, cured, and tested in accordance with SNI and ASTM standards. Compressive strength and density were measured at 7, 14, and 28 days, while splitting tensile strength and porosity were evaluated at 28 days. The results show that compressive strength increased with curing age, reaching 1.56–2.37 MPa at 28 days. The optimal mixture (BR 5GTW 20NS 10RP) achieved 1.93 MPa, exceeding the minimum SNI requirement of 1.8 MPa for lightweight concrete blocks. Density values ranged from 683 to 1001 kg/m³, confirming the lightweight classification. Splitting tensile strength ranged between 0.315 and 0.388 MPa, while porosity varied from 4.38% to 8.12%, indicating acceptable physical performance. Conclusion, Significance, and Impact of the Study: The incorporation of GTW, NS, and RP enhances mechanical performance while maintaining appropriate density and porosity. This approach offers a sustainable and cost-effective construction material by valorizing industrial waste, reducing environmental burdens, and supporting environmentally responsible urban infrastructure development.
Co-Authors Agung Sumarno Krisma Adijaya Adijaya Mindy Barend Wiguno Nazifa Sekarningtyas Ouali Amiri Ouali Amiri Yohans Sunarno