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三灰碎石抗裂性能研究

Keywords: 道路工程,三灰碎石,试验研究,抗裂性能,干缩性能,温缩性能

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Abstract:

通过基本力学性能试验,对比研究了三灰碎石等半刚性基层材料的强度特性。基于失水率、干缩应变、干缩系数等指标,研究分析了三灰碎石和其他半刚性基层材料的干缩性能。回归分析了累计干缩量与时间和累计失水率的关系。并通过温缩试验分别研究了温度收缩系数与温度区间的关系、平均温缩系数与最大温缩系数的关系。研究表明在三灰碎石外掺水泥小于2%的情况下,三灰碎石的干缩性能、温缩性能均优于水泥粉煤灰稳定碎石和水泥稳定碎石,但是均比二灰碎石稍差。建议三灰碎石外掺水泥的含量不超过2%,通过早期养护提高三灰碎石的干温缩性能;推荐以0~-10℃之间的温缩系数评价三灰碎石的温缩性能。

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