干旱荒漠区水泥粉煤灰稳定风积沙碎石基层高温稳定性和冻融耐久性研究  

Research on high-temperature stability and freeze-thaw durability of cement fly ash stabilized aeolian sand and crushed stone base course in arid desert regions

作　　者：蔡欣越 赵宁 苏明 李光耀 黄玺睿 李玉芳 CAI Xinyue;ZHAO Ning;SU Ming;LI Guangyao;HUANG Xirui;LI Yufang(Xinjiang Jiaokan Zhiyuan Engineering Technology Co.,Ltd.,Urumqi 830000,China)

机构地区：[1]新疆交勘致远工程科技有限公司,乌鲁木齐830000

出　　处：《中国科技论文》2024年第12期1297-1308,共12页China Sciencepaper

摘　　要：针对干旱荒漠区沥青路面基层建设的需求,探讨水泥粉煤灰稳定风积沙碎石混合料的高温稳定性和冻融耐久性。通过击实、高温养护、冻融耐久性和pH测定等试验方法,研究了不同压实系数和养护温度对混合料力学性能的影响。结果表明:随着养护温度的升高,混合料的抗压强度显著提升,且风积沙掺量与压实系数的增加能够协同增强强度;在2%Na2SO4溶液中进行的冻融循环试验显示,混合料的耐久性降低,风积沙的剥落加剧了材料的劣化。此外,建立了考虑冻融循环次数、风积沙掺量和压实系数影响的强度演化模型,模型验证结果显示出高准确性和可靠性。综上所述,风积沙作为替代细集料在沥青路面基层的应用具有良好的潜力。To satisfy the requirements on the base course construction for asphalt pavements in arid desert regions,the hightemperature stability and freeze-thaw durability of cement-fly ash stabilized aeolian sand and crushed stone mixtures were investi⁃gated.The effects of compaction coefficients and curing temperatures on the mechanical properties were studied via compaction,high-temperature curing,freeze-thaw durability,and pH determination tests.The findings reveal that as the temperature rises,the compressive strength of the mixture increases,and the aeolian sand content along with the compaction coefficient can synergistically enhance the strength.Freeze-thaw cycle tests indicate that the durability of the mixture decreases,especially in a 2%Na2SO4 solu⁃tion,where the spalling of aeolian sand exacerbates the deterioration of the material.An intensity evolution model was established,taking into account the effects of freeze-thaw cycles,aeolian sand content,and compaction coefficient.Model validation demon⁃strates high accuracy and reliability.The results suggest a promising potential for aeolian sand in the base course of asphalt pave⁃ments as an alternative fine aggregate.

关 键 词：风积沙碎石 粉煤灰 高温养护 冻融循环 演化模型 

分 类 号：U414[交通运输工程—道路与铁道工程]