Geoecological assessment of the technology for using drilling waste in the composition of asphalt-concrete

UDK: 502.55:622.24
DOI: 10.24887/0028-2448-2020-12-139-142
Key words: drill cuttings, negative impact, geosphere, utilization, road construction, asphalt-concrete
Authors: A.S. Vlasov (Perm National Research Polytechnic University, RF, Perm), K.G. Pugin (Perm National Research Polytechnic University, RF, Perm; Perm State Agrarian-Technological University, RF, Perm), A.A. Surkov (Perm National Research Polytechnic University, RF, Perm)

The article presents the results of research of the production of asphalt-concrete using drill cuttings as a mineral powder. Laboratory studies of the original samples of drill cuttings were carried out. It was found that there are no excess of the standards for the content of heavy metals in a mobile form in the samples of drill cuttings. An analysis of the physical and chemical characteristics of water extracts showed that there are high values of chemical oxygen demand, the content of oil products, dry residue, chlorides, exceeding sanitary standards, which indicates a negative impact on the environment. The chosen method of utilization assumes the use of drill cuttings as a mineral powder, which will reduce the negative load by placing the drill cuttings in a dense hydrophobic structure of asphalt concrete. To study the dependence of the values of the physical and mechanical properties of asphalt concrete on the drill cuttings content, three series of tests with different component composition were carried out. Analysis of the data obtained showed that with an increase in the content of drill cuttings in the composition of the asphalt concrete mixture, its average density increases, and the water saturation indicator decreases. An excessive amount of drill cuttings leads to a decrease in the strength of the coating. This is due to the heterogeneity of the drill cuttings composition, due to the chlorides, drilling fluid reagents and oil products that are part of the drill cuttings, which contribute to the deterioration of the physical and mechanical properties of asphalt concrete. It has been established that the optimal content of drill cuttings in the composition of asphalt concrete can reach up to 7% by weight, while the physical and mechanical properties will meet the requirements of national standard GOST 9128-2013.


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