Evaluation of the Effect of Heat-adhesive Emulsions for Tack Coats with Shear Test from the Road Research Laboratory of Barcelona
نویسنده
چکیده
The use of conventional emulsions for tack coats can cause problems as they frequently stick to the tires of construction vehicles. Consequently the bond between the asphalt layers is inadequate. The importance of tack coats in the performance of the pavement means that bituminous emulsions are constantly being improved. Recently, new types of emulsions have been developed from very low penetration bitumen that contains no flux. They are known as “heat-adhesive” emulsions and they are resistant to construction vehicles. The purpose of this study is to analyze the effect of different heat-adhesive emulsions and to verify their performance in service, in comparison with the response of a conventional emulsion. For this reason a new shear test –the LCB testhas been developed in the Road Research Laboratory of the Technical University of Catalonia. This test is carried out at different temperatures, both on laboratory specimens and on cores extracted from recently constructed pavements, where the same emulsions and dosages have been used. The application of the LCB test has shown that the performance of the different heat-adhesive emulsions mainly depends on the characteristics of the base bitumen and the kind of modifier used. At low temperatures, heat-adhesive emulsions reach, in general terms, lower shear resistances than conventional emulsions; however, at intermediate temperatures there are heatadhesives emulsions with both higher and lower strengths than those of the conventional emulsions.
منابع مشابه
Physical and Rheological Properties of Oil in Water Heat Stable Emulsions Made from Different Stabilizers
Oil in water emulsions have attracted considerable attention in food industry due to their large applications. In this study, the effect of thermal treatment on oil in water emulsions (o/w) containing 40% oil was studied. The emulsions were prepared using xanthan gum, guar gum and carboxymethyl cellulose as stabilizer and polyoxyethylen sorbitan monooleat as emulsifier. A mixture design was use...
متن کاملThe physical and rheological properties of egg albumin emulsions are influenced by basil seed gum as the stabilizer
In this study, the effect of basil seed gum (BSG) on the stability and rheological properties of egg white albumin (EWA) emulsions was investigated. A constant amount of EWA (0.5% w/v) and different concentrations of BSG (0-0.3% w/v) were used for the manufacture and stabilization of oil-in-water emulsions (30% w/w). The results showed that by increasing BSG concentration, the storage (21 days)...
متن کاملInfluences of Surface Characteristics and Modified Asphalt Binders on Interface Shear Strength
Weak bonding between layers of pavement leads to damages on the composite pavement. Bonding plays an important role in the durability and maintenance of composite pavement layers. The present study evaluates the factors effective in bond strength of the interface between concrete and asphalt pavements. The factors considered for this purpose include steel slag percentage in the concrete pavemen...
متن کاملIn vitro study of the effect of sodium hypochlorite and type of bonding on the shear bond strength of the composite to the bovine dentin
In vitro study of the effect of sodium hypochlorite and type of bonding on the shear bond strength of the composite to the bovine dentinDr. Kermanshah, H.* - Dr. Ghanbaripour H.** *Assistant Professor of Operative Dentistry Dept., Faculty of Dentistry, Tehran University / Medical Sciences. **Dentist. Abstract Background & Aim: Recent studies have reported the increase in bonding stability whe...
متن کامل