Mixture Design Manual and Performance-Based Specifications for Cold Patching Mixtures

摘要

The purpose of these cold mixture design guidelines is to provide recommendations to the Texas Department of Transportation (TxDOT) for a homemade design procedure for cold patching mixtures under cold weather conditions. This manual identifies and discusses the special considerations that must be given to critical mixture properties. Ensuring specific mixture characteristics translates into an increase in patch performance and cost effectiveness with the corresponding associated savings to the Department. In addition, these guidelines suggest preliminary performance-based specifications based on testing results from TxDOT Project 0-4872, Material Design and Testing Methods for Home Made and Containerized Cold Mix. These specifications help to identify those homemade and containerized cold patching mixtures that are expected to perform satisfactorily in the field. Furthermore, these guidelines can evolve into standard specifications for approving or rejecting the use of a specific mixture in the field. To this effect more testing of a wider range of mixtures is necessary. It is important to note that these recommendations were developed primarily for cold and wet weather conditions.