大温差区盐渍化水泥稳定碎石基层强度特性研究
Research on Strength Characteristics of Salinized Cement Stabilized Macadam Base in Large Temperature Difference Regions
唐卫江 1李慧宙 2李海1
作者信息
- 1. 永升建设集团有限公司 克拉玛依 834000
- 2. 长安大学公路学院 西安 710064
- 折叠
摘要
为研究沙漠大温差地区养护温度和硫酸盐含量对水泥稳定碎石材料的强度特性的影响,以S21阿乌高速公路项目二期工程为依托,结合现场调研得到现场水泥稳定碎石基层温度及含盐情况,分别开展养护温度为10,20,30,40 ℃,以及硫酸盐含量分别为0,0.5％,1.0％,2.0％条件下强度试验,并对试件水化产物及微观形貌进行分析.结果表明,随着养护温度的升高,水泥稳定碎石材料的水化反应速度加快,氢氧化钙和水化硅酸钙等水化产物生成量明显增加,试件强度性能得到增强;当混合料中硫酸盐含量为0.5％时,对试件强度性能劣化效果微弱,当硫酸盐含量达到1.0％后,钙矾石等侵蚀产物生成量大幅增加,试件的强度性能急剧下降.
Abstract
In order to study the influence of curing temperature and sulfate content on the strength characteristics of cement stabilized macadam materials in desert areas with large temperature differ-ences,based on the second phase of the S21 Urumqi-Altai Expressway project,combined with on-site research,the temperature and salt content of the cement stabilized macadam base were obtained,and the strength tests were carried out under the conditions of curing temperature of 10,20,30,40 ℃,and sulfate content of 0％,0.5％,1.0％,2.0％,respectively.And the hydration products and microstruc-ture of the specimens were analyzed.The results show that as the curing temperature increases,the hydration reaction rate of cement stabilized macadam material accelerates,and the amount of hydra-tion products such as calcium hydroxide and hydrated calcium silicate increases significantly.The strength performance of the specimens is enhanced.When the sulfate content in the mixture is 0.5％,the degradation effect on the strength performance of the specimen is weak.When the sulfate content reaches 1.0％,the amount of corrosion products such as ettringite increases significantly,and the strength performance of the specimen sharply decreases.
关键词
大温差/养护温度/硫酸盐/强度性能Key words
large temperature difference/curing temperature/sulfate/strength characteristics引用本文复制引用
出版年
2024
NETL
NSTL
万方数据