## 1 Introduction  
The continuous development of transportation infrastructure in China has led to a substantial increase in the number of silty mudstone slopes along roads and railways in the hot and humid southern regions. However, frequent rainfall and evapotranspiration can significantly contribute to the deterioration of silty mudstone slopes, potentially leading to slope failures [1]. This poses a significant threat to the safety of road operations and the well-being of individuals and property. Grouting techniques are commonly used to repair fractured silty mudstone slopes, and their effectiveness depends largely on the type of grouting material used. Presently, silicate cement-based grouting material remains the predominant material employed for slope grouting due to its inherent advantages, including stability and high strength. However, its production incurs substantial costs and results in substantial carbon dioxide emissions during the manufacturing process, a factor that is incongruent with China's commitment to achieving its strategic 'dual-carbon' target. Therefore, there is an urgent need to develop green, low-carbon, cost-effective grouting materials that are efficient for restoration and environmentally friendly. Geopolymer is a gelling material with a three-dimensional mesh structure, consisting of AlO\({}_{4}\) and SiO\({}_{4}\) tetrahedral structural units. It is made from minerals or industrial wastes rich in silica and aluminum through the chemical reaction process of depolymerization, reorganization, coalescence, and setting in an alkaline environment [2,3]. In recent years, a significant number of studies have been conducted on the use of geopolymer grouting materials as a replacement for silicate cement-based grouting materials. [PERSON] et al. [4] investigated the feasibility of using waste glass powder (GP) as a partial precursor in alkali-activated mortars made from fly ash (FA) and ground granulated blast furnace slag (GGBFS). The findings demonstrate that the FA-GGBFS mortar exhibits a dense and compact microstructure at a 20% GP dosing. [PERSON] et al. [5] used mechanochemical activation to prepare geopolymer grouting material from GGBFS and fly ash, and found that the flowability and mechanical properties of the slurry significantly improved with an increase in the slag dosage. In the aforementioned studies on the preparation of geopolymer grouting materials, the majority of the main cementitious materials selected include fly ash, GGBFS, and other highly reactive solid waste materials. However, fly ash is associated with several disadvantages, including a protracted setting time and inadequate durability. Additionally, it contains high levels of radioactive substances and heavy metals, which can easily pollute soil and groundwater if not properly managed, posing challenges to addressing the root of environmental issues [6, 7, 8]. This limits its use in engineering applications [9]. Although GGBFS has high activity, rich resource reserves, and a low cost [10,11], its dry shrinkage is significant, and it is difficult to meet engineering requirements when using it alone [12]. Zeolite powder is selected as a composite material with GGBFS powder for the preparation of geopolymer grout slurry. Zeolite powder is a material produced by grinding natural zeolites. It is of interest because of its local availability and low cost [13]. The unique spatial mesh structure of this material provides a large internal surface area and reactivity [14], which can effectively improve the performance and quality of the grouting material [15], and, at the same time, overcome the difficulties of low raw material activity and poor alkali activation in building materials from solid wastes. As demonstrated in previous studies, geopolymer grouting materials are most commonly deployed in road construction, filling hollow areas, and reinforcement tunnels. [PERSON] et al.