ABSTRACT

This study examined a specific pavement study (SPS-6) in the long-term pavement performance (LTPP) program to evaluate the influences of the three slab fracturing techniques, namely, crack and seat (C&S), break and seat (B&S), and rubblization on the performance of rehabilitated PCC pavements with asphalt overlays. Fourteen projects using a variety of PCC rehabilitation treatments were identified from the LTPP SPS-6 experiment, and the corresponding climatic data, traffic volume, layer thicknesses, back-calculated layer moduli, and performance data such as pavement smoothness, rut depth, longitudinal and transverse cracking were assembled. Two performance indicators, weighted annual average performance (WAAP) and average annual incremental performance (AAIP), were used to quantify the pavement performance. Statistical analysis results indicate that the C&S or B&S with a 20 cm asphalt overlay provided significantly better transverse cracking performance than a 10 cm asphalt overlay on PCC pavements. The rubblization technique nearly eliminated reflective cracking distress. A multiple linear regression model was developed to correlate design factors with the transverse cracking performance of rehabilitated PCC pavements. The layer thickness of PCC slab, modulus of fractured slab, modulus ratio of E_PCC/E_AC, and freezing index were identified as significant factors affecting the transverse cracking performance of C&S or B&S pavements.

摘要

本研究检查了长期路面性能 (LTPP) 计划中的特定路面研究 (SPS-6)，以评估三种板坯压裂技术的影响，即裂缝和座 (C&S)、断裂和座 (B&S)、和碎石对沥青覆盖层修复的 PCC 路面性能的影响。从 LTPP SPS-6 实验中确定了使用各种 PCC 修复处理的 14 个项目，以及相应的气候数据、交通量、层厚、反算层模量以及路面平整度、车辙深度、纵向和横向裂纹被组装。两个性能指标，加权年平均性能（WAAP）和平均年增量性能（AAIP），用于量化路面性能。统计分析结果表明，具有 20 cm 沥青覆盖层的 C&S 或 B&S 在 PCC 路面上提供的横向开裂性能明显优于 10 cm 沥青覆盖层。碎石化技术几乎消除了反射裂纹的困扰。开发了一个多元线性回归模型，以将设计因素与修复后的 PCC 路面的横向开裂性能相关联。PCC板的层厚、断裂板的模量、E的模量比 开发了一个多元线性回归模型，以将设计因素与修复后的 PCC 路面的横向开裂性能相关联。PCC板的层厚、断裂板的模量、E的模量比 开发了一个多元线性回归模型，以将设计因素与修复后的 PCC 路面的横向开裂性能相关联。PCC板的层厚、断裂板的模量、E的模量比_PCC /E _AC和冻结指数被确定为影响 C&S 或 B&S 路面横向开裂性能的重要因素。