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水泥稳定砂砾在多年冻土地区路面基层应用中普遍出现了板体性差、强度低等问题,通过模拟多年冻土地区实际温度变化和单一恒温的强度试验,与标准养生条件对比分析了特殊温度条件对水泥稳定砂砾混合料强度形成的影响。研究得出,多年冻土地区特殊的低温和负温条件将明显延缓混合料强度的形成速度;养生温度对混合料强度形成的影响存在临界状态,当第二天养生温度达到研究得出的临界温度分界点7℃后,只通过提高养生温度来进一步提高强度或加快强度增长的效果并不明显。结果表明,多年冻土地区特殊的温度条件是基层出现板体性差和强度低等问题的主要原因,解决问题的关键在于采取提高混合料设计强度、掺入外加剂、保温和封闭施工等技术措施,保证和提高早期强度,降低负温和低温影响程度。
Cement stabilized gravel commonly encountered in the pavement base application in permafrost areas are poor, low strength and so on. By simulating the actual temperature changes in permafrost regions and a single constant temperature strength test, the special temperature conditions were compared with standard health conditions Effect of Cement Stabilized Aggregate Mixture Strength Formation. The results show that the special low temperature and negative temperature conditions in permafrost area will delay the formation speed of mixture strength obviously. The effect of temperature on the formation strength of mixture has a critical condition. When the temperature reaches the critical point After the temperature demarcation point is 7 ° C, the effect of further increasing the intensity or accelerating the increase of the intensity is not obvious only by increasing the temperature for keeping the temperature. The results show that the special temperature conditions in permafrost areas are the main reasons for poor plate body and low strength in the grassroots. The key to solve the problem is to take measures to improve the design strength of the mixture, admixture, insulation and closed construction , To ensure and enhance the early strength, reduce the negative temperature and low temperature impact.