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All Journal Journal Of World Science Jurnal Konstruksi Jurnal Atma Inovasia
Ni Nyoman Kencanawati
Universitas Mataram
Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Environmental Science Health Professions Law, Crime, Criminology & Criminal Justice Social Sciences Other

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Preplaced Lightweight Aggregate Concrete (PLWAC) Dengan Bahan Agregat Kasar Batu Apung dan Fly Ash Sebagai Agregat Halus Adhika Raffi Athallarizq; Ngudiyono; Akmaluddin; Buan Anshari; Hariyadi; Ni Nyoman Kencanawati; Tri Sulistyowati
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.3444

Abstract

Concrete is a composite material widely used because it has high compressive strength; however, it has a weakness in the form of high density. Lightweight concrete innovation such as Preplaced Lightweight Aggregate Concrete (PLWAC) offers a solution, using a method in which lightweight aggregate is first placed into the mold and then filled with grouting material, which is expected to reduce density. This study uses pumice stone as coarse aggregate and fly ash as fine aggregate. The purpose of this study is to analyze the effect of variations in the cement-to-fly ash ratio on the flowability and compressive strength of the grouting material, as well as to evaluate the mechanical properties (compressive strength, splitting tensile strength, and flexural strength) and physical properties (density and water absorption) of PLWAC. The grouting material used variations of cement-to-fly ash ratios of 1:0.5, 1:1, 1:1.5, and 1:2. The grouting method was carried out using manual pumping into molds that had been filled with pumice aggregate. The specimens consisted of 12 cubes measuring 50 mm × 50 mm × 50 mm for grouting material compressive strength testing, 28 cylinders measuring 150 mm × 150 mm for compressive strength, splitting tensile strength, and absorption tests, and 12 beams measuring 150 mm × 150 mm × 530 mm for PLWAC flexural strength testing. The test results at 56 days show that increasing the fly ash content caused a decrease in mechanical properties. The highest compressive strength of the grouting material was 28.64 MPa at a ratio of 1:0.5. Meanwhile, PLWAC achieved the highest compressive strength of 6.22 MPa, splitting tensile strength of 1.27 MPa, and flexural strength of 1.28 MPa. The lowest PLWAC density was obtained in the cement-to-fly ash composition of 1:2, at 1,388.3 kg/m³, with water absorption of 28.79 percent.
Effect of Using Styrene Butadiene Rubber (SBR) on Physical, Mechanical, and Microstructure Properties of Recycled Coarse Aggregate Concrete Heating Grinding Method Iram Syahrani; Ni Nyoman Kencanawati; Ngudiyono Ngudiyono; Miko Eniarti
Journal of World Science Vol. 4 No. 4 (2025): Journal of World Science
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jws.v4i4.1345

Abstract

Concrete is a widely used material in civil engineering projects. However, the excessive use of natural coarse aggregates can disrupt environmental balance and generate non-biodegradable concrete waste. An innovative solution to this problem is the use of recycled coarse aggregates. Nevertheless, recycled aggregates often cause microcracks and weak interface transition zones (ITZ) due to the presence of old mortar. This study aims to evaluate the effect of SBR additives on the physical, mechanical, and microscopic properties of concrete using recycled coarse aggregates processed through the heating-grinding (H-G) method, compared to conventional concrete. The research was conducted by varying the SBR content at 0%, 2.5%, 5%, and 10% by weight of mixing water. The results show that H-G concrete with 5% SBR content demonstrated the best performance, closely approaching the properties of normal concrete. Improvements were observed in compressive strength by 5.40%, split tensile strength by 0.59%, modulus of elasticity by 8.59%, and a reduction in water absorption by 5.02% compared to H-G concrete without SBR. Scanning Electron Microscope (SEM) analysis also indicated that the addition of SBR effectively minimized microcracks and improved the quality of the ITZ. In conclusion, the addition of 5% SBR to recycled aggregate concrete significantly enhances its physical and mechanical properties, providing a promising alternative for sustainable construction. The implication of this study is the potential broader application of recycled aggregates with SBR additives to reduce the environmental impact of concrete production.
Konstruksi Bangunan Sederhana dan Tahan Gempa SDN 7 Sape Kabupaten Bima Dewandha Mas Agastya; Fera Fitri Salsabila; Nyoman Merdana; Pathurahman; Evrianti Syntia Dewi; Hariyadi; Ni Nyoman Kencanawati
Jurnal Atma Inovasia Vol. 6 No. 4 (2026)
Publisher : Lembaga Penelitian dan Pengabdian pada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/jai.v6i4.14234

Abstract

Bima Regency is an area with significant earthquake risk, making the application of earthquake – resistant construction principles in educational facilities essential. However, the understanding of construction workers and the local community regarding technical standards for earthquake – resistant buildings is still limited. This community service activity aimed to improve knowledge and implementation of simple earthquake – resistant construction principles in school facility development at SD Negeri 7 Sape, Bima Regency. The methods included socialization activities on the technical requirements of earthquake – resistant buildings followed by direct supervision and assistance during construction work. The materials delivered covered building material quality, structural dimensions and elements, structural connections, and construction workmanship quality. The results showed an improvement in workers and community members understanding of earthquake – resistant construction principles and better application of structural details, such as proper stirrup spacing, adequate concrete cover, and the use of 135˚ stirrup hooks. The activity also increased awareness regarding the importance of material quality and accuracy in construction work. Therefore, this community service program contributes positively to improving the quality of simple earthquake – resistant buildings and supports disaster risk education efforts in educational facilities.
Co-Authors Adhika Raffi Athallarizq Akmaluddin Buan Anshari Dewandha Mas Agastya Evrianti Syntia Dewi Fera Fitri Salsabila Hariyadi Iram Syahrani Miko Eniarti Ngudiyono Ngudiyono Ngudiyono Nyoman Merdana Pathurahman Tri Sulistyowati