【摘要】 【目标】探究戈壁盐渍土地区盐分、温度对水泥稳定碎石基层材料弹性模量的影响机制。【方法】利用单轴压缩试验研究了硫酸钠含量、温度对试样弹性模量的影响；借助电镜扫描（SEM）和能谱分析（EDS）试验揭示了硫酸钠含量、温度对水泥稳定碎石的胶凝材料内部形貌结构和腐蚀产物成分的影响；建立了水泥稳定碎石的胶凝材料内部孔隙总面积占比与弹性模量之间的关系。【结果】水泥稳定碎石材料的弹性模量随硫酸钠含量的增加呈现先增大后减小的趋势；硫酸钠含量的增加，导致胶凝材料孔隙结构的孔径和孔隙总面积占比先减小后增大；硫酸钠含量在2.5%时，材料的弹性模量最大、胶凝材料中孔隙总面积占比最小；相较于低温制件和养护，高温制件和养护条件下试件的弹性模量更高，试样胶凝材料内部孔隙的孔径和总面积占比更小；EDS结果表明硫酸钠含量大于2.5%或低温条件使得胶凝材料中既含有化学腐蚀产物钙钒石晶体（AFt）,又含有物理结晶产物十水硫酸钠晶体（Na₂SO₄·10H₂O）;随着胶凝材料中孔隙总面积占比的增加，弹性模量逐渐减小。【结论】硫酸钠含量和温度对水泥稳定碎石基层材料力学性能与胶凝材料微观结构有显著影响。更多还原

【Abstract】 [Objective]To investigate the influence mechanisms of salt content and temperature on the elastic modulus of cement stabilized macadam in gobi saline soil area, [Method]this study employed the uniaxial compression test to examine the influences of sodium sulfate content and temperature on the elastic modulus of samples. The scanning electron microscopy and energy-dispersive X-ray spectroscopy were utilized to elucidate the influences of sodium sulfate content and temperature on the internal morphological structure and corrosion product composition of cementitious material inside the cement stabilized macadam. The relation was established between the total internal pore area proportion of cementitious material and the elastic modulus. [Result]The elastic modulus of cement stabilized macadam initially increases and then decreases with the sodium sulfate content increasing. The sodium sulfate content increasing leads to a decrease followed by an increase in both pore size and total pore area proportion of cementitious material pore structure. [Data]The maximum elastic modulus and minimum total pore area proportion occur with the sodium sulfate content of 2.5%. Compared with low-temperature manufacturing and curing conditions, the specimens under high-temperature conditions exhibit higher elastic modulus, and smaller pore sizes and total pore areas. The energy-dispersive X-ray spectroscopy result indicates that when the sodium sulfate content exceeds 2.5% or under low-temperature conditions, the cementitious material contains not only the chemical corrosion products, e.g., ettringite crystals（AFt）, but also the physical crystallization products, e.g., mirabilite（Na₂SO₄·10H₂O）. As the total pore area proportion of cementitious material increases, the elastic modulus gradually decreases. [Conlusion]Sodium sulfate content and temperature significantly influence the mechanical properties of cement stabilized macadam and the microstructure cementitious material.更多还原