ABSTRACT

Base layer stiffness, durability, permeability, and constructability are all significant factors that influence the performance of a concrete pavement system. The interaction between a concrete pavement and the underlying base layer(s) affects the response, including the distribution of stress, strain and deflection, of the pavement system to traffic loads and environmental conditions. Subbase stiffness is also a significant influence on crack initiation in the PCC slabs. To verify these findings, a field investigation experiment was conducted on Interstate 90 in New York to compare the performance of two Portland Cement Concrete (PCC) sections, one with the NY Standard pavement design using Portland Cement Concrete on top of Cement Treated Permeable Base (CTPB), and the other with an alternate design using PCC on top of Dense Graded Aggregated Base (DGAB). Data collected from the two sections were compared, in particular the deflections due to temperature fluctuations and responses to Falling Weight Deflectometer (FWD) testing. The subgrade moisture content for both sections was similar. The DGAB sections provided equal if not better support for the PCC pavement which would result in longer-lasting pavement sections with lower construction and ownership costs than more expensive CTPB.

摘要

基层刚度、耐久性、渗透性和可施工性都是影响混凝土路面系统性能的重要因素。混凝土路面和底层基层之间的相互作用会影响路面系统对交通荷载和环境条件的响应，包括应力、应变和挠度的分布。底基层刚度对 PCC 板的裂纹萌生也有重要影响。为了验证这些发现，在纽约 90 号州际公路上进行了现场调查实验，以比较两个波特兰水泥混凝土 (PCC) 路段的性能，其中一个采用纽约标准路面设计，在水泥处理的可渗透基础上使用波特兰水泥混凝土 ( CTPB), 另一个是在密集分级聚合基础 (DGAB) 之上使用 PCC 的替代设计。比较了从这两个部分收集的数据，特别是由于温度波动和对落锤挠度计 (FWD) 测试的响应而导致的挠度。两个部分的路基含水量相似。DGAB 路段为 PCC 路面提供了同等甚至更好的支持，这将导致比更昂贵的 CTPB 更低的建设和拥有成本的更持久的路面路段。