摘要
为指导不同岩性机制砂在沥青路面的应用,选择3种岩性机制砂制备沥青混合料,分析机制砂岩性对沥青混合料水稳定性、高稳定性、低温抗裂性能的影响,并探索抗剥落措施对混合料性能的影响。结果表明:石灰岩机制砂混合料的稳定度和残留稳定度比均略高于辉绿岩机制砂混合料,远高于花岗岩机制砂,冻融劈裂试验也显示出一致的规律;相比花岗岩机制砂,辉绿岩机制砂混合料动稳定度提升52.6%,石灰岩机制砂混合料动稳定度提升45.2%;低温状态下,花岗岩机制砂混合料的抗裂性能最差,石灰岩机制砂和辉绿岩机制砂混合料的低温弯拉应变优良;使用抗剥落措施后,花岗岩机制砂和辉绿岩机制砂混合料水稳定性、高温性能均得到明显改善,其中残留稳定度比提升5%以上,残留强度比提升16%以上,动稳定度提升50%以上。
In order to guide the application of manufactured sands with different lithologies in asphalt pavement, three lithology kinds of manufactured sands are selected to prepare the asphalt mixtures. The influences of manufactured sand lithology on the water stability, high stability and low-temperature crack resistance of asphalt mixtures are analyzed. The influence of anti-spalling measures on the mixture performance is explored. The results show that the stability and residual stability ratio of limestone machined sand mixture are slightly higher than that of diabase machined sand mixture and much higher than that of granite manufactured sand. The freeze-thaw splitting test also shows a consistent law.Compared with the granite manufactured sand, the dynamic stability of diabase manufactured sand mixture is increased by 52.6%, and that of limestone manufactured sand mixture is increased by 45.2%. At low temperature, the granite manufactured sand mixture has the worst crack resistance, but the limestone manufactured sand and diabase manufactured sand mixtures have the excellent low-temperature flexural-tensile strain. After using the anti-spalling measures, the water stability and high-temperature performance of the granite manufactured sand and diabase manufactured sand mixtures are significantly improved, in which the residual stability ratio is increased by more than 5%, the residual strength ratio is increased by more than 16%, and the dynamic stability is increased by more than 50%.
作者
丁蓬勃
郑董成
陈搏
揭继兴
DING Pengbo;ZHENG Dongcheng;CHEN Bo;JIE Jixing
出处
《城市道桥与防洪》
2022年第12期213-218,I0018,共7页
Urban Roads Bridges & Flood Control
关键词
机制砂岩性
水稳定性
低温抗裂性能
高温稳定性
抗剥落措施
manufactured sand property
water stability
low-temperature crack resistance
high-temperature stability
anti-spalling measures
作者简介
丁蓬勃(1989-),男,硕士,工程师,从事高速公路建设管理工作。
