CRTSⅡ型水泥乳化沥青砂浆静态力学性能发展的微观分析

测试了沪昆高铁江西段现场成型CRTS II型CA砂浆长期力学性能的发展变化,并通过沥青抽滤,水泥热重分析,压汞法和核磁共振等试验方法分析了沥青组分、砂浆内部微观孔隙结构变化,水泥水化程度对砂浆长期力学性能的影响.结果发现:砂浆28 d抗压强度与弹性模量均达到了规范要求,随着龄期延长,砂浆力学性能持续升高,但42 d以后砂浆力学性能增长放缓,水泥的持续水化使得砂浆内部孔隙不断细化,强度上升;养护7 d后,砂浆内沥青含量已经固定,成膜固化过程完成.

Micro-analyze on development of the static mechanical properties of CRTS I type cement emulsified asphalt mortar

The development of static mechanical properties of CRTS Ⅱ type cement emulsified asphalt （CA） mortar was studied. The specimens were made with the fresh mortar used in Jiangxi section of HU-KUN High Speed railway. The asphalt in mortar was extracted by Trichloroethylene at different age. Then, MIP （Mercury intrusion method） and NMR （Nuclear Magnetic Resonance） were employed to analyze the pore structure of mortar, and the cement hydration was analyzed by means of TGA （Thermogravimetric Analysis）. According to the results, at the age of 28 days the compressive strength and elasticity modulus had reached the value offered in standard. The mechanical properties had been increasing with the progress of age due to the cement hydration, causing the pore refinement. However, the increasing rate became quite slow after 42 days. It could found that the film formation of emulsified asphalt was relative quick and reach stable just after 7 days.