Pavement Preservation Journal, Winter 2011, Vol. 5, No. 2
By Juan Du
The University of Texas-Austin initiated a series of research studies to investigate prime coat properties. The first study aims at capturing the effect of weather conditions, application method and type of prime coat on curing time, and also to look into prime coat’s other properties such as penetration, permeability and strength.
The second research study focuses on how long it takes for prime coat materials to achieve maximum strength, investigating the relationship between weight loss and strength growth. There is a relationship between weight loss
and strength gain, and an experiment was conducted at a TxDOT laboratory to discover the actual relationship. This article summarizes the results of the second experimental study.
To make the results comparable to the first study, the researcher kept the prime coat materials, base material, application method and application rate, etc. the same as the first experiment. Prime coat materials used were MC-30, CSS-1h, SS-1h, AEP, EC-30 and TSB. The base material chosen was limestone, which is most commonly used in Texas. Two application methods, spray on and mixed-in, were used to prepare the specimens.