利用西北地区丰富的沙漠砂资源制作混凝土，可以有效缓解当地河砂需求量增加与天然砂匮乏之间的矛盾，且由于西北盐渍地区建筑物饱受耐久性考验。基于氯盐自然浸泡试验，测量了6组沙漠砂不同替代率（0、20%、40%、60%、80%、100%）的混凝土在浸泡150 d内的质量、相对动弹性模量、抗压强度及劈裂抗拉强度等指标，并结合扫描电子显微镜（scanning electron microscope, SEM）和X射线衍射仪（X-ray diffractometer, XRD）表征技术揭示其劣化机理，建立了氯盐侵蚀下损伤劣化模型。结果表明：氯盐侵蚀使得沙漠砂混凝土的质量和相对动弹模量略微增加，且其强度有所提高，其中低掺量的沙漠砂混凝土受氯盐侵蚀的影响较大。SEM和XRD结果表明：混凝土内部NaCl结晶和盐侵产物Friedel's盐填充于界面过渡区（interfacial transition zone, ITZ）附近孔隙及裂缝间，是其宏观上性能提高的根本原因；基于损伤力学理论定义损伤度，试验数据通过二次抛物线函数进行拟合得到的氯盐侵蚀下损伤模型R²精度值较高，均高于0.96。

Concrete is produced using abundant desert sand resources from northwest China to alleviate the conflict between increasing demand for river sand and the scarcity of natural sand. It is also intended to address durability challenges in the saline regions of northwest China. Based on chloride-salt natural immersion tests, six groups of concrete with desert-sand replacement ratios of 0, 20%, 40%, 60%, 80% and 100% were prepared and were immersed for 150 days. During immersion, mass, relative dynamic elastic modulus, compressive strength, and splitting tensile strength were measured. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the deterioration mechanisms. A damage-degradation model under chloride-salt exposure was then established. Results show that chloride-salt exposure causes slight increases in mass and relative dynamic elastic modulus of the desert-sand concrete. The strength of the concrete is also increased. The effect is greater for mixtures with low desert-sand replacement ratios. SEM and XRD results indicate that NaCl crystals and the salt-invasion product Friedel's salt are deposited in pores and cracks near the interfacial transition zone (ITZ). This deposition is the primary cause of the observed macroscopic performance improvement. Damage is defined using damage mechanics theory. The experimental data are fitted with a quadratic parabolic function. The resulting damage model for chloride-salt exposure shows high R² values. All R² values are greater than 0.96.