KR-20260062535-A - Non-cement and non-silicate inorganic grout composition and eco-friendly grouting process using the same

Abstract

In order to solve these conventional technical problems, the present invention relates to a cement-free, non-silica inorganic grout material that does not contain cement, which fundamentally causes environmental problems, and does not use silicates of the sodium silicate class that weaken durability, while simultaneously having excellent physical properties such as bleeding rate, gelation time, strength, and shrinkage rate, and having a low or non-existent amount of total phosphate detected, and does not cause eccentricity during the grout formation process so that over-excavation does not occur inside boreholes, etc., and an eco-friendly grouting method using the same.

Inventors

• 황규억
• 장 윤 환
• 문재훈
• 백우열

Assignees

• 황규억
• 장 윤 환
• 문재훈
• 백우열

Dates

Publication Date

20260507

Application Date

20241029

Claims (5)

1. Cement-free non-silica inorganic grout material containing the following components: (a) Liquid A comprising cement-free agent A comprising 20-50% by weight of anhydrous gypsum and 50-80% by weight of fine limestone powder, and (b) Liquid B comprising a non-silicate B agent comprising 10-30 wt% calcium sulfur aluminate (CSA), 30-45 wt% fly ash, and 26-59 wt% lithium carbonate.
2. In claim 1, the liquid A comprises 200-500 kg of the above-mentioned A based on 500 L, and A cement-free, non-silica inorganic grout material characterized by containing 200-500 kg of the above B agent based on 500 L of the above liquid B.
3. Cement-free non-silica mineral grouting method including the following steps: (A) A step of preparing liquid A by adding anhydrous gypsum to a preparation water and stirring, and then sequentially adding and stirring fine limestone powder to prepare liquid A, (B) A step of preparing liquid B by adding calcium sulfur aluminate to a preparation water for preparing liquid B and stirring, sequentially adding fly ash and stirring, and then adding lithium carbonate and stirring. (C) A step of mixing the above liquid A and the above liquid B to form a grout material.
4. In paragraph 3, the above liquid A comprises a cement-free agent A comprising 20-50% by weight of the above anhydrous gypsum and 50-80% by weight of the above limestone fine powder, and A cement-free non-silicate inorganic grouting method characterized by the above liquid B comprising 10-30% by weight of calcium sulfoaluminate (CSA), 30-45% by weight of fly ash, and 26-59% by weight of lithium carbonate.
5. In paragraph 4, the above liquid A comprises 200-500 kg of the above A based on 500 L, and A cement-free, non-silica inorganic grouting method characterized by containing 200-500 kg of the above-mentioned B agent based on 500 L of the above-mentioned liquid B.

Description

Non-cement and non-silicate inorganic grout composition and eco-friendly grouting process using the same The present invention relates to a cement-free, non-silica inorganic grout material and an eco-friendly grouting method using the same. At civil engineering construction sites, it frequently occurs that waterproofing and ground reinforcement are required during the construction of underground structures or tunnels. For example, in urban areas, the foundation ground often becomes unable to accommodate the increased load resulting from the expansion or remodeling of high-rise buildings. In particular, since tunnels constitute national infrastructure and roads necessarily pass through many of them, it is essential that tunnels maintain their original condition throughout the road's design lifespan. Nevertheless, structural or material performance degradation frequently occurs due to environmental factors or acting external forces, resulting in significant costs being incurred for tunnel maintenance, repair, and reinforcement. For this reason, interest in tunnel cavity backfill materials is increasing. However, existing tunnel cavity backfill materials often result in undesirable backfills due to material segregation, bleeding, and difficulties in construction caused by on-site mixing. These backfills act as a cause that shortens the lifespan of the tunnel by causing cracks in the lining, stress concentration, and leakage. In addition, water in the ground penetrates cracks in underground structures and facilities, causing problems such as corrosion of internal rebar and expansion of cracks, which reduces durability or leads to leakage through the cracks. As such, tunnel structures (especially lining concrete) must be integrated with the surrounding rock mass forming the tunnel, and since the tunnel structure must behave as an integral part of the surrounding rock mass even under external shocks such as earthquakes during design, the existence of cavities behind the tunnel is fundamentally prohibited in design and construction. However, cavities behind the tunnel that frequently occur act as channels for groundwater flow, causing the tunnel structure to separate from the surrounding rock mass and severely affecting safety in the event of an external shock. In particular, the presence of voids in the ceiling area causes deterioration due to groundwater accumulation, which reduces usability and may even lead to loosening of the upper ground or longitudinal cracking of the lining ceiling. As seen above, if roads, bridges, or buildings are placed directly on soft ground, which consists of weak clayey or organic soil and cannot support superstructures, the settlement becomes excessive and safety issues arise due to insufficient bearing capacity. Therefore, grouting is generally performed to reinforce the soft ground and prevent such problems from occurring. Grouting methods are used in civil engineering sites for purposes such as improving bearing capacity through grout solidification, ensuring water impermeability by reducing permeability coefficients, lowering soil compressibility, and shortening construction time by reducing noise and vibration generated during construction. Recognized for their effectiveness, these grouting methods are widely used for various purposes, including ground reinforcement and waterproofing, foundation pile formation, soft ground improvement, structural reinforcement, and tunnel reinforcement and waterproofing. In Korea, the most common grout injection methods are the chemical-based LW (Labiles Wasserglass) and SGR (Space Grouting Rocket System) methods, as well as the suspension-based Portland Cement Milk injection method, which are evaluated as superior in terms of economic efficiency and are therefore frequently implemented. The LW method is a representative 1.5-shot injection method that involves mixing and injecting water glass (sodium silicate) and cement milk. It is primarily capable of full penetration into gravel and sand layers, and is injected into soft clayey soil and silt layers to prevent subsidence or reinforce the ground. While the LW method is inexpensive and easy to implement, it has disadvantages such as the inability to use combined injection methods involving slow-setting and fast-setting types, as well as strength reduction and environmental pollution caused by the leaching of water glass. The SGR method is a representative 2.0-shot injection method that utilizes a mixed suspension of water glass, a rapid-setting agent, and cement. By using a three-stage mixing device, continuous combined injection of rapid-setting and slow-setting agents is possible, making it easy to achieve ground waterproofing. It is applicable to both clayey and sandy soils, and is used for improving soft ground. However, when water glass is used, the hydration reaction of the mixed cement is inhibited, making it difficult to achieve long-term strength. Furthermore, as time passes, water gl