棉秸秆纤维沥青混合料路用性能研究
发布时间：2019-05-12 13:28
【摘要】：纤维沥青混合料因其优良的高温稳定性、低温抗裂性及抗水损害性能被广泛应用于沥青路面工程。目前,可用于沥青混合料的纤维类型众多,路用效果参差不齐,工程造价相差较大,探索新型路用纤维具有重要的现实意义。本文以环保、资源化利用棉秸秆,制备棉秸秆纤维,辅以木质素纤维,进行沥青混合料配合比设计,检验其路用性能。首先,选用AC-13和SMA-13矿料级配,采用马歇尔试验方法,依次确定设计级配、棉秸秆纤维合理掺量及最佳油石比,随后,依次采用车辙试验、低温弯曲破坏试验、浸水马歇尔试验、冻融劈裂试验评价棉秸秆纤维沥青混合料的高温稳定性、低温抗裂性及水敏感性,结果表明:对于AC-13型沥青混合料,棉秸秆纤维最佳掺量约为0.2%,对于SMA-13型沥青混合料,棉秸秆纤维最佳掺量约为0.3%;AC-13和SMA-13棉秸秆纤维沥青混合料最佳油石比分别为5.0%、5.9%;与未掺棉秸秆纤维沥青混合料相比,最佳油石比约增加0.2%,动稳定度约提高30%,低温抗弯破坏应变约提高15.0%,棉秸秆纤维沥青混合料残留稳定度和冻融劈裂强度比均能满足规范要求。棉秸秆纤维沥青混合料与木质素纤维沥青混合料各项路用性能基本接近,为推广棉秸秆纤维在沥青混合料中的应用提供参考。
[Abstract]:Fiber asphalt mixture is widely used in asphalt pavement engineering because of its excellent high temperature stability, low temperature crack resistance and water damage resistance. At present, there are many fiber types that can be used in asphalt mixture, the road effect is uneven, and the engineering cost is quite different. It is of great practical significance to explore the new type of road fiber. In this paper, cotton straw fiber was prepared by environmental protection and resource utilization of cotton straw, supplemented by lignin fiber, and the mixture proportion design of asphalt mixture was carried out to test its road performance. Firstly, AC-13 and SMA-13 mineral gradation were selected and Marshall test method was used to determine the design gradation, the reasonable amount of cotton straw fiber and the optimum oil / stone ratio. Then, the rut test and low temperature bending failure test were used in turn. Water immersion Marshall test and freeze thaw splitting test were used to evaluate the high temperature stability, low temperature cracking resistance and water sensitivity of cotton straw fiber asphalt mixture. The results showed that for AC- 13 asphalt mixture, the optimum content of cotton straw fiber was about 0.2%. For SMA- 13 asphalt mixture, the optimum content of cotton straw fiber is about 0.3%. The optimum oil-stone ratio of AC-13 and SMA-13 cotton straw fiber asphalt mixture was 5.0% and 5.9%, respectively. Compared with the unmixed cotton straw fiber asphalt mixture, the optimum oil-stone ratio is increased by 0.2%, the dynamic stability is increased by 30%, and the bending failure strain at low temperature is increased by 15.0%. The residual stability and freeze-thaw split strength ratio of cotton straw fiber asphalt mixture can meet the requirements of the code. The road performance of cotton straw fiber asphalt mixture is close to that of lignin fiber asphalt mixture, which provides a reference for popularizing the application of cotton straw fiber in asphalt mixture.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
本文编号：2475427
[Abstract]:Fiber asphalt mixture is widely used in asphalt pavement engineering because of its excellent high temperature stability, low temperature crack resistance and water damage resistance. At present, there are many fiber types that can be used in asphalt mixture, the road effect is uneven, and the engineering cost is quite different. It is of great practical significance to explore the new type of road fiber. In this paper, cotton straw fiber was prepared by environmental protection and resource utilization of cotton straw, supplemented by lignin fiber, and the mixture proportion design of asphalt mixture was carried out to test its road performance. Firstly, AC-13 and SMA-13 mineral gradation were selected and Marshall test method was used to determine the design gradation, the reasonable amount of cotton straw fiber and the optimum oil / stone ratio. Then, the rut test and low temperature bending failure test were used in turn. Water immersion Marshall test and freeze thaw splitting test were used to evaluate the high temperature stability, low temperature cracking resistance and water sensitivity of cotton straw fiber asphalt mixture. The results showed that for AC- 13 asphalt mixture, the optimum content of cotton straw fiber was about 0.2%. For SMA- 13 asphalt mixture, the optimum content of cotton straw fiber is about 0.3%. The optimum oil-stone ratio of AC-13 and SMA-13 cotton straw fiber asphalt mixture was 5.0% and 5.9%, respectively. Compared with the unmixed cotton straw fiber asphalt mixture, the optimum oil-stone ratio is increased by 0.2%, the dynamic stability is increased by 30%, and the bending failure strain at low temperature is increased by 15.0%. The residual stability and freeze-thaw split strength ratio of cotton straw fiber asphalt mixture can meet the requirements of the code. The road performance of cotton straw fiber asphalt mixture is close to that of lignin fiber asphalt mixture, which provides a reference for popularizing the application of cotton straw fiber in asphalt mixture.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
【引证文献】
相关会议论文 前1条
1 毛炜峄;南庆红;史红政;;新疆气候变化特征及气候分区研究[A];中国气象学会2008年年会气候变化分会场论文集[C];2008年
，本文编号：2475427
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