Determination of elasticity, compatibility, determination of storage of modified bitumes

Abstract

Properties of asphalt and asphalt polymer composites as systems with a coagulation structure are determined mainly by the quality of bituminous binders. According to this, the quality indicators of the binding agents should be as objective as possible, allowing them to predict strength, displacement, cracks, water resistance and aging resistance of concrete on their basis.

Elasticity is the ability of bitumen-polymer binder to develop large deformations under the influence of external forces, and after the cessation of their action return to its original state. The essence of the method is to determine the part of the elastic (reversible) deformation in the general deformation of the sample.

Adhesion of bitumen is the strength of its adherence to the surface of the main or acidic stone materials in the contact area. When a pair of bitumen - the mineral surface is in a dry state, the adhesion of bitumen is always greater than its cogenesis (bitumen strength in a thin layer). When such a pair is in an aqueous medium, there is an extinction of the bituminous film from the surface of the stone material. This is due to the high polarity of water, which due to this well rubs the stone surface and penetrates it under the film of bitumen. In this regard, a useful indicator of the ability of bitumen to withstand the extinguishing action of the mineral surface is practically useful. Such an indicator is called clutter.

There are different methods of determining the adhesion. They are divided into passive and active ones. Passive clinging characterizes the ability of bitumen to resist flaking it from the mineral surface under the influence of water. Active clinging indicates the ability of bitumen to interact with the mineral surface in the presence of water and stick to it. Additionally, clamping properties can be determined qualitatively and quantitatively.

Stratification can lead to unpredictable consequences for the quality of asphalt polymer mixtures and asphalt polymer concrete. Determination of the degree of stratification makes it possible to use measures to eliminate it.

The essence of the method for determining the bundle is to determine the difference in the properties of the binder, modified by the polymer, from the upper and lower parts of the tube, which was maintained in an upright position at 180 ° C for 24 hours.

The results of experimental studies of determination of elasticity, adhesiveness (adhesion), stratification during storage of road bitumen, modified with polymeric active additives Kraton D1101, Calprene C-411, Calprene C-501 and waxy additive Sasobit are given.