低水泥稳定级配碎石基层材料路用性能研究

发布时间：2019-01-05 16:41

【摘要】：随着我国改革开放,现代化建设的逐步深入,公路建设取得了突飞猛进的发展。半刚性基层以其良好的板体性、刚度和扩散应力能力,并且具有抗压强度高、抗疲劳强度高等优势,成为了我国公路建设中主要的沥青路面基层形式。随着半刚性基层路面的广泛应用,其所存在的问题也日益凸显出来,由于半刚性基层的收缩开裂及由此引起沥青路面的反射性裂缝普遍存在,同时路面水可以通过裂缝进入路面基层及其他结构层,并且很难及时排出,致使路面在投入使用后的短期内出现各种病害。另外,半刚性基层由于自身特性,在修补方面也有一定的困难。为了解决这些问题,有学者提出在沥青面层下铺设级配碎石柔性基层,用以减少路面的反射裂缝。但是级配碎石柔性基层强度较低,易变性,抗疲劳能力较低,所以并不能成为解决沥青路面反射裂缝的有效方式。通过对半刚性基层损害形式以及对柔性基层优缺点进行分析,本文提出了介于半刚性基层和柔性基层之间的半柔性基层材料,即低水泥剂量稳定级配碎石基层材料。为了研究低水泥剂量稳定级配碎石基层材料的路用性能,本文针对材料的强度和刚度、抗缩裂性能、水稳定性能设置了大量的室内试验,并且对试验数据进行了系统的整理、分析与评价。在材料的强度和刚度方面,具体设置了七天无侧限抗压强度试验、回弹模量试验、CBR试验、劈裂强度试验；在材料的抗缩裂性能方面,具体设置了干缩试验、温缩试验；在材料的水稳定性能方面,具体设置了渗水试验、冻融试验。通过以上试验,系统的对低水泥稳定级配碎石基层材料的路用性能能进行研究与评价,为该项技术在实际工程中的应用提供了科学依据。为了进一步研究低水泥剂量稳定级配碎石基层材料的路用性能,证明该项技术在减少沥青路面损害方面的优越性,在沈环北线铺筑了2.5KM的试验路,并对试验路路面使用性能实施至少为期1年的检测,检测内容为：路面平整度检测、路面裂缝检测、路表弯沉检测,并对大量的检测数据进行整理分析,用以评价低水泥稳定级配碎石基层材料的路用性能。
[Abstract]:With China's reform and opening up and the deepening of modernization, highway construction has made rapid progress. Semi-rigid base has become the main asphalt pavement base in highway construction in our country because of its good slab, stiffness and diffusive stress ability, and has the advantages of high compressive strength and high fatigue strength. With the wide application of semi-rigid base pavement, the existing problems become more and more prominent. Because of the shrinkage cracking of semi-rigid base and the reflex crack of asphalt pavement, At the same time, pavement water can enter the pavement base and other structural layers through cracks, and it is difficult to discharge in time, resulting in a variety of diseases in the short term after the pavement is put into use. In addition, semi-rigid base because of its own characteristics, there are some difficulties in repair. In order to solve these problems, some scholars put forward to lay graded gravel flexible base under asphalt surface to reduce the reflection crack of pavement. But the graded crushed stone flexible base is of low strength, variability and low fatigue resistance, so it can not be an effective way to solve the asphalt pavement reflective cracks. Based on the analysis of the damage form of semi-rigid base and the advantages and disadvantages of flexible base, this paper proposes a semi-flexible base material between semi-rigid base and flexible base, that is, low cement dosage stabilized gradation gravel base material. In order to study the pavement performance of low cement dosage stabilized graded macadam base material, a large number of laboratory tests have been set up for strength and stiffness, shrinkage crack resistance and water stability of the material, and the test data have been systematically sorted out. Analysis and evaluation. In terms of strength and stiffness of the material, seven days' unconfined compressive strength test, elastic modulus test, CBR test, splitting strength test, dry shrinkage test and temperature shrinkage test are set up in detail. In the aspect of water stability of materials, water seepage test and freeze-thaw test are set up. Through the above tests, the road performance of low cement stabilized graded macadam base material is systematically studied and evaluated, which provides a scientific basis for the application of this technology in practical engineering. In order to further study the pavement performance of low cement dosage stabilized graded macadam base material and to prove the superiority of this technology in reducing the damage of asphalt pavement, the 2.5KM test road was built on the Shenhuan North Line. The pavement performance of the test road is tested for at least one year. The detection contents are: pavement smoothness detection, pavement crack detection, pavement surface deflection detection, and a large number of test data are sorted out and analyzed. Used to evaluate the road performance of low cement stabilized graded crushed stone base material.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;U416.214

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