ZHANG Meng1,2,*, DOU Zhi1, WANG Zeping1, WEN Yong1
1 School of Architecture and Engineering, Xinjiang University, Urumqi 830017, China 2 Xinjiang Civil Engineering Technology Research Center, Urumqi 830017, China
Abstract: Utilizing desert sand (DS) as a replacement for fine aggregate, alkali-activated slag/fly ash desert sand concrete (AADSC)was fabricated to investigate the impact of varying desert sand and fly ash (FA) replacement ratios on the workability and fundamental mechanical properties of the concrete. The hydration products, microstructure, and pore structure of the AADSC were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). The results show that, compared to the concrete without DS, when the DS amount is 20%, the 28 d and 91 d cubic compressive strength of AADSC increases by 7.4% and 22.6% respectively. The addition of DS significantly improves the early-age (3, 7, and 28 d) strength of concrete, as well as substantially enhances the later-age (91 d) strength. Moreover, the addition of an appropriate amount of DS can improve the pore distribution characteristics and microstructure of the concrete, and increase its density. The 28-day compressive strength, flexural strength, and axial compressive strength of the concrete all initially increase and then decrease with the increase in FA content. Additionally, the incorporation of FA also has a relatively significant effect on enhancing its later-age strength development.
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2025, Vol. 39 
