## 1 Introduction  
Inner Mongolia is rich in mineral resources [1], but while resource advantages drive economic development, the large-scale discharge and storage of bulk solid waste has become an issue that cannot be ignored. The large storage of fly ash, carbide slag, and slag not only wastes land resources but also contaminates the environment. Geopolymer is a new kind of inorganic aluminosilicate cementitious material with hydraulicity [2], which is usually prepared using aluminosilicate material under the action of an alkaline activator. At present, there are some achievements in the research and application of geopolymers worldwide, but there are few studies on the utilization of solid waste materials through geopolymer theory. The application of bulk solid waste to the production of geopolymer cementitious materials and the replacement of some cement for road bases not only solves the storage of bulk solid waste but also reduces the project costs and has certain economic and environmental benefits. In addition, as a seasonal freezing zone, InnerMongolia has drastic temperature changes, which, in turn, leads to pavement damage, affecting the service life and maintenance cost of the pavement structure. The geopolymer cementitious material developed by using bulk solid waste materials has advantages of high strength, great anti-freezing performance and a stable and adjustable thermal expansion coefficient, which can make up for the shortcomings of cement as cementitious material and pavement base. At present, the research on geopolymers at home and abroad is more extensive: In [PERSON] et al. [3], aiming at a slag-based solid waste geopolymer, different slag contents and curing methods were designed to explore the carbonation resistance of geopolymer. The results show that high slag content and standard curing are beneficial to improve the carbonation resistance of the geopolymer. [PERSON] et al. [4] used slag, phosphogypsum, carbide slag and steel slag to prepare solid waste-based cementitious materials. The results of the mechanical properties of the material show that the incorporation of carbide slag makes the hydration reaction more sufficient, forming C-A-S-H gel and AFit, which significantly enhances the 3 d and 7 d strength of the material. [PERSON] et al. [5] used industrial solid wastes such as basic oxygen furnace slag and fly ash to prepare geopolymers, combined with iron ore tailings and steel fiber to prepare geopolymer composites, and explored the most suitable ratio. The results showed that the compression and bending strength of geopolymer composites prepared by 40% basic oxygen furnace slag, 1.5% steel fiber and 45% iron ore tailings reached 41.8 MPa and 5.78 MPa, respectively. [PERSON] et al. [6] used industrial solid wastes such as steel slag and fly ash to prepare a geopolymer and explored its mechanical strength. The results showed that when the content of steel slag and NaOH-Na2 SiO3 was 30% and 18%, the mechanical strength was the highest. The 7 d compressive strength reached 19.3 MPa. [PERSON] et al. [7] used fly ash and red mud to prepare geopolymers and explored their strength. The results showed that the compressive strength and flexural strength of geopolymers reached 31.5 MPa and 4.32 MPa under 60 \({}^{\circ}\)C environmental curing conditions. Under the support of the existing research results of geopolymers, the application research progress of geopolymers in road engineering is remarkable. [PERSON] et al. [8] prepared geopolymers using calcium carbide slag and straight-chain alkyl benzene sulfonic acid as raw materials for stabilizing base granules. The results showed that the optimum UCS (unconfined compressive strength) of the mix was achieved at a geopolymer dosage of 7.5%. [PERSON] et al.