Desert Sand Concrete Blend Survives 200 Freeze-Thaw Cycles in Low-Carbon Concrete Study

Researchers in China tested concrete made with sand from the Tengger Desert as a partial substitute for river sand. The binder used alkali-activated slag and fly ash instead of Portland cement, cutting the need for carbon-intensive clinker. A mix with 40% desert sand performed best: it survived 200 freeze-thaw cycles, retained 94.56% of its dynamic elastic modulus, and predicted an equivalent service life of about 113 years in a Weibull model. The study gives a useful benchmark for cold-climate construction, but the service-life numbers are model extrapolations, not field data. The authors note that salt freezing, carbonation, and drying shrinkage still need testing. For now, the result supports blending desert sand at around 40% into alkali-activated concrete as a way to reduce river sand mining and industrial waste, without sacrificing durability.