## 1 Introduction
(2018) used a geopolymer to build mine roads and studied the performance changes in mine roadway materials under freeze-thaw cycles. The results show that as the test temperature decreases, the number of cycles increases, and the strength of the sample gradually decreases. The interior of the sample becomes loose, and the fracture mode is crystal fracture. [PERSON] et al. (2018) used NaOH and Na\({}_{2}\)SiO\({}_{3}\) as alkali activators and used carbide slag and coal gauge as raw materials to prepare cementitious materials for highway subgrade construction. The test results show that the material has good frost resistance. After six freeze-thaw cycles, the 7 d UCS of the material was 2.86 MPa, and the strength loss rate was 22.6%. [PERSON] (2018) used red mud and mineral powder to prepare cementitious materials after alkali excitation for the preparation of the base mixture. The test showed that when the content of cementitious materials was 8%, the mechanical properties and frost resistance of the mixture were the best. [PERSON] et al. (2018) used domestic waste incineration slagging and fly ash to prepare a geopolymer. The results of the mixture test showed that the strength, water stability and frost resistance of the mixture increased with the increase in the content of the geopolymer. When the content of the geopolymer was 12%, the performance of the mixture was optimal. The results of the above research are summarized and analyzed, and then potential researchable content is identified. Firstly, existing research used geopolymers as a cementitious material, which can be used for roadbed construction and road construction in mining areas, with certain environmental and economic benefits, as the raw materials used are mostly industrial solid wastes (2018); (2018); (2018); (2018); (2018); (2018). Secondly, considering the existing research on geopolymer-stabilized road building materials' mechanical strength, frost resistance, environmental impact and other aspects, the results show the following: the geopolymer, as road building materials, has good mechanical strength, with a certain degree of frost resistance, and the geopolymer effectively reduces the leaching rate of the heavy metals contained in industrial solid waste materials (2018); (2018); (2018). The main purpose of this study is to use industrial solid waste to prepare a geopolymer for highway grass-roots construction; at the same time, the frost resistance of geopolymer-stabilized gravel grass-roots mixes and the freeze-thaw damage mechanism are investigated. The geopolymer used in this study is mainly prepared from industrial solid waste, and the main raw materials are mineral powder, fly ash and wet calcium carbide slag. Mineral powder is the finished raw material produced by the thermal power plant, with a grade of S95, fly ash graded as F, wet calcium hydroxide slag, calcium hydroxide slag after hydrolysis of acetylene gas, and alkali exciters, and the NaOH granular purity is more than 96%. The preparation method for the geopolymer is to mix mineral powder, fly ash and calcium hydroxide slag according to the ratio of 85:10:5, and then 2.58% NaOH was added and mixed well. We added water at the end and mixed. The mass ratio of water to dry material is 1:2. The novelty of this study is that the geopolymer is used to prepare road subgrade materials instead of being limited to roadbed construction and mining road construction, which is conducive to increasing the resource utilization of industrial solid waste and saving on highway costs; moreover, this study used grey correlation analysis to investigate the strength damage mechanism of the mix after a freeze-thaw cycle for this kind of subgrade mix instead of being limited to the study of its frost resistance. This can provide a reference and optimization basis for the construction of highway base layers in cold regions.