TxDOT Research Library - TxDOT Research Project

Show:

Feasibility Study of Two-Lift Concrete Paving

Project Summary

Two-lift concrete paving (2LCP) involves placing two layers of concrete (wet-on-wet) instead of placing a single homogeneous layer, as is typically done in the United States. 2LCP offers the opportunity to optimize the use of local aggregates, recycled materials to produce an economical, durable and sustainable pavement system with the most desirable surface characteristics (improved skid resistance and reduced noise). Districts including Houston, Ft. Worth and Dallas have the potential to receive great benefit from the concept by being able to use more local materials that is not considered appropriate for traditional (one lift) concrete pavement used. Despite of all the above mentioned benefits, challenges of 2LCP are to have the proper paving equipment and pavement construction management, the right mixture proportions to ensure the use of local materials in the bottom lift to result in an economical placement, and the proper proportions and materials to ensure adequate surface friction in the top lift. This study is to evaluate feasibility and cost effectiveness of 2LCP, particularly in the state of Texas. A comprehensive literature review will first be conducted to gather previous experiences and past performance of 2LCP, particularly to justify the cost and efficiently execute the process of 2LCP. Surveys and interviews will be conducted on contractors and agencies with experience with 2LCP. A one-day workshop regarding 2LCP will be organized to obtain information from a wide range of agency, construction, equipment people and TxDOT personnel with experience or interests in 2LCP. The workshop will serve as a solicitation of ideas of the best practice, most cost effective approach, concerns and requirements associate with materials and construction of 2LCP. Information and inputs collected from surveys, interviews and the 2LCP workshop will be summarized to provide construction perspectives of implementation of 2LCP, including additional costs, requirements and impacts to project scheduling of implementation of this concept. A cost effectiveness analyses and feasibility study of the most promising 2LCP practice will also be conducted.

Project Number

0-6749

Status

Completed

link icon Copy link to this project.