泡沫沥青冷再生混合料低温抗裂性评价方法及影响机理分析

发布时间：2018-05-31 22:10

本文选题：道路工程 + 泡沫沥青冷再生混合料　；参考：《公路工程》2017年02期

【摘要】：随着泡沫沥青冷再生混合料在国省干线和高速公路等高等级公路下面层中的大规模应用,其低温抗裂性需引起更多关注。采用低温弯曲试验和SCB试验研究了水泥掺量、泡沫沥青用量、RAP掺量对泡沫沥青冷再生混合料低温抗裂性的影响,基于SEM试验揭示了水泥和泡沫沥青对冷再生混合料低温抗裂性的影响机理。结果表明,增大水泥掺量和提高泡沫沥青用量均可改善泡沫沥青冷再生混合料的低温抗裂性,RAP掺量对泡沫沥青冷再生混合料低温性能影响不大,推荐采用低温SCB试验评价泡沫沥青冷再生混合料的低温抗裂性,以弯拉应变和破坏应变能作为评价指标,建议泡沫沥青冷再生破坏应变能不少于1 500 J/m2。水泥对泡沫沥青冷再生混合料的影响机理在于加筋、填充和减小了泡沫沥青冷再生混合料内部微孔数量。
[Abstract]:With the large-scale application of foamed bitumen cold recycled mixture in the lower layer of high grade highway, such as national and provincial trunk lines and highways, the low temperature crack resistance of foamed asphalt mixture needs to be paid more attention. The low temperature bending test and SCB test were used to study the effect of cement content and foam asphalt content on the low temperature crack resistance of cold recycled foamed asphalt mixture. The influence mechanism of cement and foamed asphalt on low temperature crack resistance of cold recycled mixture was revealed based on SEM test. The results show that the low temperature crack resistance of cold recycled foamed asphalt mixture can be improved by increasing the content of cement and the content of foamed asphalt. The low temperature SCB test is recommended to evaluate the low temperature crack resistance of cold recycled foamed asphalt mixture. The flexural strain and failure strain energy are taken as the evaluation indexes, and it is suggested that the strain energy of cold regeneration failure of foamed asphalt should not be less than 1 500 J / m 2. The influence mechanism of cement on cold recycled mixture of foamed asphalt is reinforced, filling and reducing the number of micropores in cold recycled mixture of foam asphalt.
【作者单位】：河南交通投资集团有限公司;
【分类号】：U414

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