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Hawa, Abideng
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering

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Sustainable thermal insulation of geopolymer blocks using solid waste: palm oil ash and palm oil clinker Hawa, Abideng; Salaemae, Preecha
Journal of Engineering and Technological Sciences Vol. 57 No. 6 (2025): Vol. 57 No. 6 (2025): December
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.6.8

Abstract

This paper has analyzed the thermal insulation of geopolymer blocks prepared using palm oil ash (POA) with the addition of alumina powder (AP) and field Para rubber latex (FPRL). The block samples were set up to use 3 and 5 channels and channel width of 2 and 4 mm each with geopolymer binder as POA (containing 5% FPRL and 0%, 2.5%, 5%, 7.5%, and 10% AP) and POC as fine aggregate. The compressive strength, water absorption, bulk density of the geopolymer mortars and thermal conductivity of geopolymer blocks were explored. The AP and FPRL had minimal impact on the compressive strength of the geopolymer mortars and the greater the amount of AP the less water was absorbed. Thermal conductivity of 4 mm wide channel geopolymer blocks was lower than that of 2 mm wide channel blocks and 5 channels blocks had lower thermal conductivity in comparison to 3 channel blocks. The geopolymer blocks had low thermal conductivity relative to the commercial concrete blocks. This study offers valuable information to the application of geopolymers made of POA with FPRL and AP to produce geopolymer materials, POC as a fine aggregate to produce green building materials with enhanced thermal insulation.
Performance Evaluation and Model of GFRP Reinforced Concrete Filled GFRP Tube Column under Accelerated Aging Prachasaree, Woraphot; Ouiseng, Jakrawa; Hawa, Abideng; Intarit, Pong-in; Wangapisit, Ornkamon; Limkatanyu, Suchart
Civil Engineering Journal Vol. 12 No. 2 (2026): February
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2026-012-02-013

Abstract

Conventional reinforced concrete structures exposed to aggressive environments show a risky tendency toward performance degradation due to concrete deterioration and reinforcement corrosion. Consequently, the use of fiber-reinforced polymer (FRP) materials in concrete structures as one of the alternative potential materials for mitigating serious durability issues in structural applications has gained increasing acceptance. The study aims to evaluate the performance and durability of GFRP-reinforced concrete-filled GFRP tube columns under accelerated aging. Three different column specimens, 1) GFRC-F-GFT, 2) GFRC, and 3) C-F-GFT, were immersed under water at 80°C for 12 hrs (wet phase), followed by specimen placement above water at ambient room temperature for 12 hrs (dry phase) in each aging cycle. The behavior and performance of the specimens were experimentally investigated through uniaxial compressive loading. The experimental results were evaluated to develop a strength capacity model that incorporated the environmental exposure effect through the strength reduction factors (C0, h1, and h2). To establish the correlation between accelerated and natural aging, field investigation data under the tropical marine environment and the simplified time-invariant model were utilized to predict structural performance. Based on this study, the GFRC-F-GFT specimen degradation under accelerated wet-dry aging at 290 cycles can reduce axial column capacity up to 50%, which is equivalent to the predicted degradation under a natural tropical marine environment over 50 years.
Co-Authors Intarit, Pong-in Limkatanyu, Suchart Ouiseng, Jakrawa Prachasaree, Woraphot Salaemae, Preecha Wangapisit, Ornkamon