Crack sealing and filling on hot mix asphalt (HMA) pavements are cost-effective pavement preservation techniques that improve pavement performance and extend the life of existing pavements. If performed in a timely and effective manner, crack sealing can extend the life of HMA pavements. CDOT sponsored this study to update its procedures and guidelines for crack sealing and filling of HMA pavements. The draft Guidelines included in this report reflect CDOT experience, current state-of-the-practice, and the most recent research findings, and address where and when to perform crack sealing and filling, material selection, installation methods, construction inspection, and follow-up evaluation.
Thermal Mapping surveys were carried out on approximately 1000 miles of the Colorado Department of Transportations (CDOTs) roads. The purpose of these surveys was to identify road surface variations across the network to determine whether forecast Thermal Maps or the data from the surveys would be useful to decision-makers in the CDOT regions.
The purpose of this study was to quantify the initial design life of a roadways pavement prior to rehabilitation and provide specific performance information through the analysis of pavement management data and historical experience. The analyzed data may be used to estimate the initial life of a pavement which can be incorporated into the LCCA within CDOTs M-E Pavement Design Guide. It will also provide guidance to CDOT and subcontractors in determining the cost-effectiveness of different pavement designs, construction and maintenance costs.
The Winter Performance Index is a method of quantifying winter storm events and the DOTs response to them It is a valuable tool for evaluating the States maintenance practices, performing post-storm analysis, training maintenance personnel, and identifying potential areas of cost savings and improved performance.
The purpose of this study is to evaluate the cost of rehabilitation techniques used on interstates, state highways, and principal arterials dating back to 2009 for use in LCCAs. The rehabilitation techniques used in this study include cold in-place recycling, hot in-place recycling, full-depth reclamation, hot-mix asphalt overlays, hot-mix asphalt mill-and-fill, and portland cement concrete pavement. Hot in-place recycling was further broken into three categories; heater remixing, heater repaving, and heater scarifying.
Self-consolidating concrete (SCC) is a stable and highly flowable concrete that consolidates without the help of external vibration and can flow through heavy reinforcement and around corners in complex formwork under its own weight. The exceptional performance of this remarkable material has attracted the attention of construction firms and DOTs in the United States interested in using SCC on new bridge construction and bridge repair projects.
This research is being conducted to evaluate the performance of various preventive maintenance treatments over time and under different environmental conditions to assess the economics of each treatment type.
This research is being conducted to evaluate the performance of various pavement preservation treatments over time and under different environmental conditions to quantify the economics of each treatment type. There are three primary techniques utilized in Colorado for preservation of asphalt pavements and three for concrete pavements.
This report provides a comprehensive literature survey of permanent and temporary deterrents to nesting and roosting, a discussion of risks to human health and safety from exposure to bird nests and droppings and recommended protective measures, and the results of a multi-year field study to test temporary nesting deterrents judged to be most effective.
This research project reviewed potential noise barrier materials made from scrap tires, selected a material for field testing, designed and built a test barrier at the designated site using the material, and monitored barrier performance for one year. The material selected was a railroad tie replacement made from scrap tire treads
This study investigated the use of infrared thermometers to detect hot or defective brakes on trucks traveling through the eastbound Port Of Entry (POE) on I-70 in Dumont, CO. The objective of this evaluation was to develop brake temperature screening criteria that can be used to identify potential brake-related problems.
Over the years, Fiber Reinforced Polymer (FRP) composites have gained popularity in transportation infrastructure as a material able to restore and increase the capacity of existing concrete elements. Properties such as a high strength to weight ratio, non-corrosive nature, durability, and high malleability make FRP materials an appealing alternative in the reinforcement of these structural elements. However, there are still concerns regarding the long-term performance of these repairs. Numerous studies have been completed by means of accelerated aging in the lab. However, behavior of these materials under realistic field conditions has yet to be thoroughly researched. As a result, this project was created to assess the durability of an FRP repair in the Castlewood Canyon Bridge in Colorado. In addition, a laboratory study was conducted to determine the long-term behavior of concrete reinforced with FRP when exposed to various environmental conditions. The specific tasks in this project include data collection and testing plans for field assessment, on-site testing and sample collection, laboratory testing and data analysis, and testing program with a focus on the effects of deicers on FRP. A literature review was developed to consider other concerns that the Colorado Department of Transportation (CDOT) engineers may have on the subject.
