隧道沥青路面混合料阻燃降粘技术研究

发布时间：2018-05-01 05:43

本文选题：隧道沥青路面 + 阻燃降粘技术　；参考：《长安大学》2015年硕士论文

【摘要】：从隧道安全运营角度出发,我国中长以上隧道路面铺装结构以水泥混凝土为主,但水泥混凝土路面有平整度差、抗滑性差、灰尘大、噪声大、高反光等缺陷。相对而言沥青混合料路面具有较好的表面构造保持能力、行车舒适性以及较好的抗滑性能,采用沥青混凝土作为隧道路面的铺装结构层已逐渐成为趋势。但在隧道中采用沥青混合料进行路面铺筑,由于隧道处于一种具有封闭性的空间结构状态,而且沥青属于可燃材料,隧道内部通风条件差,一旦发生交通事故火灾,沥青混合料中的沥青有可能在高温条件下燃烧并释放有毒、有害气体及烟尘,给救援带来极大困难。隧道沥青路面混合料阻燃降粘技术的研究目的就是通过一定的技术手段制备得到阻燃沥青混合料,以降低火灾事故的危害;同时考虑到隧道路面施工的特殊性,为降低普通热拌沥青混合料施工所产生大量的烟雾,减小对施工技术人员健康的影响并提高工作效率,采用降粘技术以降低混合料的施工温度并减少烟雾释放量。本文通过大量的试验,研究了在沥青中添加不同掺量的阻燃剂,测定其三大指标、LOI值以及沥青的存储稳定性,确定出阻燃剂的掺量范围,在基质沥青中掺加阻燃剂最大掺量为6%,在SBS改性沥青中阻燃剂最大掺量为10%;测定了在沥青中添加降粘剂后沥青的基本指标以及表观粘度,绘制粘—温曲线进而确定出降粘剂的掺量,在SBS改性沥青中SA降粘剂最大掺量为4%、TPSA掺量为3%;在基质沥青中SA降粘剂掺量为3%、TPSA掺量为3%。采用正交试验设计对掺加阻燃剂、降粘剂的沥青胶结料进行试验分析,得出配比掺量的最优组合,基质沥青添加降粘剂及阻燃剂的最优配比为:3%SA降粘剂+6%阻燃剂、3%TPSA+5%阻燃剂;SBS改性沥青中添加降粘剂与阻燃剂的最优配比为:3%SA降粘剂+7%阻燃剂、3%TPSA+7%阻燃剂。在沥青混合料性能研究中得出,最优组合条件下沥青混合料的路用性能满足现行规范的要求,通过直观燃烧试验表明沥青混合料阻燃效果明显,而且相比普通热拌沥青混合料的施工温度均得以降低。
[Abstract]:From the point of view of tunnel safety operation, cement concrete is the main pavement structure of medium length tunnel pavement in our country. However, cement concrete pavement has some defects such as poor smoothness, poor skid resistance, large dust, high noise, high reflection and so on. Relatively speaking, asphalt mixture pavement has better surface structure retention ability, driving comfort and better skid resistance. It has gradually become a trend to use asphalt concrete as the pavement pavement pavement structure layer. However, the asphalt mixture is used for pavement construction in the tunnel. Because the tunnel is in a closed space structure state, and the asphalt belongs to combustible material, the ventilation condition inside the tunnel is poor, once the traffic accident fire occurs, Bitumen in asphalt mixture may burn and release toxic, harmful gas and smoke under high temperature, which brings great difficulties to rescue. The purpose of the research on the flame retardant and viscosity reduction technology of the asphalt pavement mixture of tunnel is to prepare the flame retardant asphalt mixture through certain technical means to reduce the harm of fire accident and to consider the particularity of the tunnel pavement construction at the same time. In order to reduce the large amount of smoke produced by the construction of common hot mix asphalt mixture, reduce the influence on the health of the construction technicians and improve the working efficiency, the viscosity reduction technique is adopted to reduce the construction temperature of the mixture and to reduce the smoke emission. In this paper, through a lot of experiments, the addition of different amount of flame retardant to asphalt is studied, the three indexes of flame retardant are measured, and the storage stability of asphalt is determined, and the range of the amount of flame retardant is determined. The maximum amount of flame retardant is 6 in matrix asphalt and 10 in SBS modified asphalt. The basic index and apparent viscosity of asphalt after adding viscosity reducer to asphalt are measured. The viscosity reducer content was determined by drawing the visco-temperature curve. The maximum content of SA viscosity reducer was 3 in SBS modified asphalt and 3 in matrix asphalt. The asphalt binder with flame retardant and viscosity reducer was tested and analyzed by orthogonal experimental design, and the optimal combination of the proportion of the binder was obtained. The optimum ratio of viscosity reducer and flame retardant to base asphalt is: 1: 3SA viscosity reducer 6% flame retardant and 3TPSA 5% flame retardant. The optimum ratio of viscosity reducer and flame retardant to SBS modified asphalt is 7% viscosity reducer 7% flame retardant and 7% TPSA 7% flame retardant. In the study of asphalt mixture performance, it is concluded that the pavement performance of asphalt mixture meets the requirements of current code under the optimal combination condition, and the visual combustion test shows that the flame retardant effect of asphalt mixture is obvious. And compared with the ordinary hot mix asphalt mixture construction temperature can be reduced.
【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

【参考文献】