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为了更真实模拟现场养生状况,设计开放养生、半密封养生及半密封+全密封养生(“组合”养生)3种养生方式,并采用力学试验对3种养生条件下泡沫沥青冷再生混合料的含水率、劈裂强度(indirect tensile strength,ITS)、无侧限抗压强度(unconfined compressive strength,UCS)及抗剪参数的发展规律进行研究;同时,通过CT扫描试验对混合料内部空隙结构进行分析.结果表明:不同养生方式下,混合料内部水分迁移路径和散失速率不一致,导致混合料养生过程中含水率及强度发展规律不一致;含水率与混合料终期养生强度密切相关;不同养生条件下混合料的内摩擦角变化规律基本一致,而黏聚力受含水率影响明显;半密封及“组合”养生水分散失速率慢,养生过程中被水化产物包裹的水分产生的水蒸气压力会破坏原有空隙结构,从而揭示了不同养生方式的空隙分布机理并推荐半密封养生36 h+全密封养生36 h作为泡沫沥青冷再生混合料中长期养生方法.
In order to more realistic simulate on-the-spot health condition, we designed three kinds of regimen including open regimen, semi-seal regimen, semi-seal regimen and hermetically sealed regimen. The research on the law of the moisture content, the indirect tensile strength (ITS), the unconfined compressive strength (UCS) and the development of the shear resistance parameters were studied. At the same time, The results showed that under different regimen types, the internal water migration pathways and the rate of loss were not consistent, which led to inconsistent development of water content and strength during the curing process. The water content was closely related to the final health intensity of the mixture. Under the condition of health, the variation law of internal friction angle of the mixture is basically the same, but the cohesion force is obviously affected by the water content; the half-seal and “combination” Water vapor pressure will destroy the original structure of the gap, which reveals the gap between the different health regimen distribution mechanism and recommended half-sealed health 36 h + full Health seal 36 h as a foam mix asphalt cold regeneration method of long-term health.