Effects of structural formation in the implementation of the technology for obtaining asphalt concrete mixtures with phosphogypsum and other additives

Abstract

Abstract The paper considers the effects of structural formation in dispersed systems and composite materials obtained using the technology of asphalt concrete with up to 30% phosphogypsum included in the mixture. The study of physicochemical and consumer properties of such systems and materials involved using the method of study of surface effects (measurement of a contact angle). One of such materials is bitumen with a non-traditional additive polyethylene terephthalate. The presented microphotographs of modified asphalt concrete mixtures allow to study the changes in the state of bitumen surface. Differential-scanning calorimetry is used to register thermal effects arising from the implementation of technology to modify the properties of materials. It is revealed that obtaining asphalt concrete mixture by pelletizing provides the necessary indicators of the hardened material’s compressive strength. It is determined that the water resistance of asphalt concrete increases at simultaneous introduction of polyethylene terephthalate and industrial waste powder — phosphogypsum — into dispersed system. It is also determined that the specified additives synergistically affect the consumer properties of bitumen and achieve the positive effect of structural formation in asphalt-binding materials, which reveals new prospects of their use in road building.