裂缝衰减式沥青超薄罩面路用性能研究

发布时间：2018-01-12 01:07

本文关键词：裂缝衰减式沥青超薄罩面路用性能研究　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：旧沥青路面和水泥混凝土路面上加铺薄层罩面是路面修复工程中经常使用的方案，而来自旧路面的反射裂缝是导致罩面损坏的主要原因，裂缝等病害的出现不仅降低了车辆行驶的舒适性和安全性也会由于渗水加速路面结构的破坏。延缓罩面反射裂缝的发生和发展可以从五个方面着手：(1)改良旧水泥混凝土路面性能,(2)沥青加铺层/混合料性能改良,(3)较厚的缓冲层,(4)加强型沥青加铺层,(5)裂缝控制措施等。本文从沥青混合料（加铺层本身）抗反射裂缝性能方面入手，借鉴美国德州交通运输研究所(TTI)开发的CAM（裂缝衰减式CrackAttenuating Mixture）沥青混合料方法开展研究。CAM沥青超薄罩面是用厚度小于或等于2.5cm的热拌沥青混合料铺筑而成的面层，，它可以用作高速公路的面层或者作为预防性养护措施加铺在仅有较小损坏和结构缺陷的路面上。论文在深入分析相关国内外研究成果的基础上，开展裂缝衰减式沥青超薄罩面路用性能的试验研究。主要包括以下工作：首先，采用贝雷法对最大公称粒径为4.75mm的CAM矿料级配进行了分析，明确CAM的级配特点；其次，选取凝灰岩、埃索A70#沥青和乳化氯丁橡胶为试验原料，运用马歇尔试验方法得到设计级配的最佳沥青含量，从中选出最佳级配和相应的沥青含量。通过检验低温抗裂性和水稳定性等指标表明CAM沥青混合料路用性能良好；然后设计一套能够在MTS上进行罩面拉伸试验的夹具，选用最佳级配混合料加工旋转击实试件，进行抗裂性能试验，研究CAM沥青混合料抗反射裂缝性能与沥青含量及氯丁橡胶改性剂的关系，结果表明掺加氯丁橡胶改性剂的沥青混合料试件开裂应力比普通沥青混合料提高了22.4%以上。最后，根据CAM沥青混合料特点，介绍CAM加铺前旧水泥路面处置方法和裂缝衰减式沥青超薄罩面施工工艺。试验研究表明，CAM型沥青混合料具备较强的抗裂性能，尤其是掺加氯丁橡胶改性剂的沥青混合料；替代性罩面拉伸实验夹具可以较好地在MTS试验机上进行薄层罩面试件的直接拉伸实验。
[Abstract]:Asphalt pavement and cement concrete pavement are paved with a thin layer of pavement , which is often used in pavement repair works . The main reason , crack and other diseases from old pavement is the main cause of damage of pavement , and the occurrence and development of cracks and other diseases not only decrease the performance of asphalt mixture , ( 2 ) improve asphalt overlay / mix performance , ( 3 ) thicker buffer layer , ( 4 ) reinforced asphalt overlay layer , ( 5 ) crack control measure , etc . This paper studies the asphalt mixture ( the crack attenuation Crackingating Mixture ) developed by the American Institute of Transportation Research ( TTI ) . It can be used as surface layer of expressway or as preventive maintenance measures to be applied to pavement with only minor damage and structural defect . Based on in - depth analysis of relevant domestic and foreign research results , the experimental research on the performance of the crack - attenuating asphalt ultra - thin cover pavement is carried out . First of all , the optimum asphalt content of the CAM asphalt mixture is determined by using the method of Bailey method , and then the best grading and the corresponding asphalt content are selected . The test results show that the crack stress of the asphalt mixture is improved by 22.4 % than that of ordinary asphalt mixture . The experimental research shows that the CAM - type asphalt mixture has stronger anti - cracking performance , especially the asphalt mixture with chloroprene rubber modifier , and the alternative cover stretching test fixture can perform the direct tensile test of the thin - layer cover interview piece on the MTS testing machine .

【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U418.6;U416.2

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