THE IMPACT OF STILLAGE RESIDUES GAINED AS A RESULT OF ANILINE PRODUCTION ON THE THERMAL STABILITY OF BITUMEN PETROLEUM VISCOUS AND BITUMEN CONCRETE WITH WASTE PRODUCTS OF LIMESTONE FRAGMENTATION

Abstract

Introduction. Aging of bitumen concrete represents an autogenous continuous process occurring under the impact of external and internal factors. The research is aimed at the detection of maximum permissible level of bitumen-concrete aging. Materials and methods: Based on the results of the research the authors suggest the research methodology of bitumen-concrete aging by means of preliminary warmup of bitumen concrete mix at high temperature. The authors also provide the durability evaluation of bitumen-concrete mix using non-dimensional parameter – aging coefficient which is a new and relatively easy analysis method for the aging counter strategy applied to organic bitumen. The process of bitumen-concrete aging was tested on modified bitumen-concrete with the additive of stillage residues gained from aniline production and waste products of limestone fragmentation. In compliance with the methodology developed by the authors, the aging process of modified bitumen-concrete mix gained from modified bitumen concrete imposed to long (up to 7 hours) mix warmup. Results. The dynamics of aging coefficient change against the ultimate strength in bitumen-concrete with waste products of limestone fragmentation imposed to compression at the following range of temperatures 0⁰С, + 20⁰С, + 50⁰С, +150 ⁰С±5 ⁰С shows that addition of stillage residues gained as a result of aniline production (AsD) into bitumen concrete in the amount of 0.5-1.0 % of the concrete mass improve the core physical and mechanical properties of the bitumen concrete. The samples of bitumen concrete containing the stillage residues in the amount of 0.5 – 1.5 % after 7 hour warmup at a temperature +150⁰С demonstrated 1.8-1.18 higher value, than the bitumen concrete samples without this additive. Conclusion. When using stillage residues gained as a result of aniline production as an additive into bitumen-concrete, they become more durable to aging when imposed to high temperatures, which in its turn extends the period of service.