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水泥稳定碎石以其强度高、水稳定性好、能就地取材等特点,在中国高等级公路的基层或底基层中已得到了广泛的应用。但对于水泥稳定碎石基层而言,随着水泥剂量的增加,其抗温缩和干缩能力也显著降低,在强度形成初期和使用过程中都容易产生干缩裂缝和温缩裂缝。该文根据2008年G318国道江苏段养护改善工程建设在苏州地区干线公路中首次采用骨架密实型水泥稳定碎石基层的实践经验,介绍了骨架密实型水泥稳定碎石的原材料选择、配合比设计、施工工艺控制及2年后的裂缝情况观察,表明工程所采取的设计方法及施工工艺是成熟且实用的。
Cement stabilized macadam has been widely used in the grassroots or subsoil of high-grade highways in China due to its high strength, good water stability and availability of materials. However, for the cement stabilized macadam base, with the increase of cement dosage, the ability of anti-shrinkage and shrinkage shrinkage is also significantly reduced, shrinkage cracks and shrinkage cracks easily occur during the initial strength and the use of cement. According to the practical experience of adopting the skeleton compact cement stabilized macadam base in the main highway in Suzhou area of G318 National Road Maintenance and Improvement Project in 2008, the paper introduces the raw material selection, mix design, Construction process control and observation of cracks after 2 years indicate that the design method and construction process adopted by the project are mature and practical.