Strengthening the road pad with ash and slag mixtures (on the example of the Transbaikal territory)

Abstract

The article is devoted to the assessment of the use of ash and slag mixtures for strengthening the pavement of highways of categories IV-V on the example of the Trans-Baikal Territory. The composition of the ash and slag mixture of the Chita CHPP-2 was studied, which showed that, if the relative frost heaving indicators correspond to the requirements of regulatory documentation, the mixture can be used in road construction of the III and IV road-climatic zones for the installation of additional (draining, frost-protective, heat-insulating) layers of pavement. The most effective compositions consisting of ash and slag mixture, cement and stabilizers ANT, Cryogelite, bitumen emulsion were determined. The results of the experimental introduction of these trains on the section of the Novaya Kuka–Mogzon–Khilok highway in 2015–2016 are presented. Studies of the strength of the obtained cement-soil clothes showed a sufficient level of the modulus of elasticity, equal to 107 MPa, which makes it possible to provide the required minimum strength of 100 MPa for a road of IV technical category. Monitoring of the road section in 2022 showed that the implementation of measures to strengthen the roadway using ash and slag materials made it possible to successfully operate the road for 7 years without repairs.