Experimental optimization of sustainable fine-grained concrete with marine quartz sand, fly ash, silica fume, and ground granulated blast slag
Van Minh NGUYEN , Ha Thanh TRAN , Hai Minh LE , Van Trong NGUYEN
Front. Struct. Civ. Eng. ›› 2025, Vol. 19 ›› Issue (11) : 1935 -1949.
Experimental optimization of sustainable fine-grained concrete with marine quartz sand, fly ash, silica fume, and ground granulated blast slag
This study proposes an optimized fine-grained concrete incorporating marine quartz sand (FGCMQS) and blended mineral admixtures to enhance mechanical performance while promoting sustainability. Marine quartz sand (MQS) was combined with crushed sand at a 30:70 ratio, resulting in an optimal gradation that meets the requirements of ASTM C33. Using response surface methodology (RSM), this study developed four statistical models to optimize the proportions of fly ash (22%), silica fume (9%), ground granulated blast-furnace slag (32%), superplasticizer (0.85%), and a water-to-cement (W/C) ratio of 0.32. The optimized FGCMQS achieved a slump of 4 cm, a compressive strength of 65.1 MPa, a chloride ion permeability of 812 C (Coulombs), and a sulfate-induced length change of 0.04%. Compared to conventional fine-grained concrete using river sand, the FGCMQS exhibited a 10.5% improvement in compressive strength but slightly higher chloride permeability and sulfate expansion. SEM analysis confirmed a denser microstructure with well-developed C-S-H and C-(A)-S-H gels. Despite durability trade-offs, the optimized FGCMQS presents a viable, eco-friendly alternative to traditional concrete, reducing cement consumption while offering enhanced strength. This study provides a foundational approach for developing high-performance, low-carbon fine-grained concrete, with potential applications in sustainable constructions. Future research should focus on durability enhancement under aggressive environmental conditions.
marine quartz sand / fine-grained concrete / mineral admixtures / concrete durability / response surface method / CO2 emissions / sustainable concrete
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Higher Education Press
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