水泥填料对心墙沥青混凝土长期水稳定性的影响

发布时间：2018-03-15 18:20

本文选题：水泥填料　切入点：心墙　出处：《水利水电科技进展》2017年04期 　论文类型：期刊论文

【摘要】：以优选的心墙沥青混凝土配合比为基础,分别采用质量分数为12%的石灰石粉、6%水泥+6%石灰石粉、12%水泥作为填料配制沥青混凝土试件,研究水泥填料对采用天然砾石骨料的心墙沥青混凝土长期水稳定性的影响。试验结果表明:采用12%石灰石粉为填料的沥青混凝土水稳定系数随浸水时间的延长而不断减小,且在浸水75 h后水稳定系数降至0.88,已不满足心墙沥青混凝土水稳定系数大于或等于0.90的要求;采用12%水泥、6%水泥+6%石灰石粉为填料的沥青混凝土水稳定系数随浸水时间的延长先增大后减小,且在浸水375 h后达到最大,分别为1.02和0.98,在浸水1 500 h后水稳定系数仍然能够满足规范要求;用水泥替代部分石灰石粉作填料也可有效改善心墙沥青混凝土的长期水稳定性。
[Abstract]:On the basis of the optimum mix ratio of asphalt concrete of core wall, the asphalt concrete specimens were prepared with limestone powder of 6% cement 6% limestone powder of 12% mass fraction and 12% cement of 6% limestone powder powder as fillers, respectively. The effect of cement filler on the long-term water stability of asphalt concrete with natural gravel aggregate is studied. The experimental results show that the water stability coefficient of asphalt concrete with 12% limestone powder as filler decreases with the prolongation of soaking time. After 75 h of immersion, the water stability coefficient is reduced to 0.88, which does not meet the requirement that the water stability factor of asphalt concrete with core wall is greater than or equal to 0.90. The water stability coefficient of asphalt concrete with 12% cement 6% cement 6% limestone powder as filler increases first and then decreases with the prolongation of soaking time, and reaches its maximum value after water immersion for 375h. After soaking in water for 1 500 h, the water stability coefficient can still meet the requirements of specifications, and the long-term water stability of bituminous concrete with core wall can be effectively improved by replacing part of limestone powder with cement as filler.
【作者单位】：新疆农业大学水利与土木工程学院;
【基金】：新疆维吾尔自治区高校科研计划(XJEDU2014I016)
【分类号】：TV431.5

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