摘要
为了使张家口坝上地区的风积沙满足公路路基的要求,通过室内击实试验研究了水泥改良张家口坝上地区的风积沙的最大干密度与最优含水率之间的关系,通过冻融试验和干湿循环试验研究水泥水泥改良风积沙的耐久性,得出了以下结论:通过击实试验得出的干密度与含水率的曲线为倒S形,即水泥改良风积沙的干密度随着含水率呈先减小后增大再减小的趋势;伴随着水泥的掺量的增大,改良风积沙的最大干密度也随之增大,最优含水率减小;随着冻融次数的增加,无侧限抗压强度减小,随着干湿循环次数的增加,无侧限抗压强度减小;相同冻融循环次数下,水泥掺量越高,无侧限抗压强度越大;相同干湿循环次数下,水泥掺量越高,无侧限强度越大。
In order to make the aeolian sand in the dam area of Zhangjiakou meet the requirements of highway subgrades,the relationship between the maximum dry density and the optimal moisture content of the aeolian sand in the dam area of Zhangjiakou improved by cement is studied through indoor compaction tests.The freeze-thaw test and dry-wet cycle test study the durability of cement-improved aeolian sand,and the following conclusions are drawn.The curve of dry density and moisture content obtained by the compaction test is an inverted S shape,that is,the dry density of cement-improved aeolian sand first decreases with the moisture content,then increases and then decreases;With the increase of the cement content,the maximum dry density of the improved aeolian sand also increases,and the optimal moisture content decreases;With the increase of the number of freeze-thaw cycles,the unconfined compressive strength decreases,and with the increase of the number of dry-wet cycles,the unconfined compressive strength decreases;Under the same number of freeze-thaw cycles,the higher the cement content,the greater the confined compressive strength;Under the same number of wet and dry cycles,the higher the cement content,the greater the unconfined strength.
作者
张海岛
李桂英
ZHANG Hai-dao;LI Gui-ying(Hebei Institute of Architecture and Civil Engineering,Zhangjiakou,Hebei 075000;Hebei Key Laboratory of Diagnosis,Reconstruction and Anti-disaster of Civil Engineering,Zhangjiakou,Hebei 075000;Zhangjiakou Product Quality Supervision Office,Zhangjiakou,Hebei 075000)
出处
《河北建筑工程学院学报》
CAS
2021年第1期43-49,共7页
Journal of Hebei Institute of Architecture and Civil Engineering
基金
2020年张家口市科技局科技研发平台提升专项(2021005A)。
关键词
耐久性
最大干密度
最优含水率
水泥
durability
maximum dry density
optimal moisture content
cement
