Document Type : Original Article
Authors
1
Faculty of Engineering, Department of Civil Engineering, Golestan University, Gorgan, Iran
2
Assistant Professor,, Faculty of Engineering, Department of Civil Engineering, Golestan University, Gorgan, Iran.
3
Faculty of Engineering, Department of Civil Engineering, Golestan University, Gorgan, Iran, Iran
10.22091/cer.2025.11254.1570
Abstract
Understanding the key variables that affect the performance of lightweight self-compacting geopolymer concrete (LSGPC) is essential for harnessing its technical and environmental benefits in real-world applications. This study aims to investigate the effect of NaOH concentration (6, 8 and 10M) and Na2SiO3/NaOH ratio (0.5, 1.5 and 2.5) on the performance of LSGPC containing scoria. For this purpose, 10 LSGPCs were produced and tested for slump flow, T50, visual stability index, V- funnel and J-ring in the fresh state and compressive strength, splitting tensile strength and water absorption in the hardened state. Results showed that using 100% scoria as a substitution of coarse aggregate reduces slump flow and increases T50 and V- funnel times due to the reduction in the weight of the mixture. Moreover, NaOH concentration and Na2SiO3/NaOH ratio with a change in the viscosity of the mixture are the factors influencing the fresh state performance of LSGPC. Microstructure observation of LSGPC samples by using SEM images revealed a stronger interfacial transition zone between the geopolymer paste and aggregate which improves the mechanical properties as the NaOH concentration increases from 6M to 10M. Furthermore, Na2SiO3/NaOH ratio of 1.5 in LSGPC mixture had the best performance in terms of increasing mechanical properties and reducing water absorption. In general, considering optimum concentration of NaOH and Na2SiO3/NaOH ratio, it is possible to produce LSGPC containing 100% scoria with acceptable fresh state properties as well as compressive strength categorized as lightweight structural concrete.
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