Novel phosphorus and magnesium based cement grouting material and preparation method

Abstract

The invention discloses a novel phosphorus and magnesium based cement grouting material and a preparation method and belongs to the field of technical application of grouting materials. The grouting material is prepared from the following raw materials in parts by weight: a component A: 30 to 90 parts of a compound magnesium compound, 0.5 to 5 parts of a compound retarder, 0.2 to 0.7 part of a water reducer, 0.2 to 1.5 parts of an acid-alkali buffering agent, 1 to 5 parts of a compound stabilizer and 0.5 to 1.5 parts of a compound surfactant; a component B: 20 to 50 parts of phosphate and 0.2to 2 parts of a de-foaming agent. The preparation method comprises the following steps: accurately weighing materials of the component A and the component B according to the ratio and uniformly stirring; mixing with water according to the weight ratio of 100 to (20 to 50) and stirring to form slurry; after uniformly mixing, pressing a mixture into gaps or cracks and curing. The novel phosphorus and magnesium based cement grouting material disclosed by the invention has the beneficial effects of controllable coagulation time, large adjustable range, high early age strength, high bonding strength, good permeability, simplicity and convenience for construction, greenness and environment protection and low cost, and meets the requirements on three properties including injectability, controllability and permeability resistance.

Description

technical field [0001] The invention belongs to the technical application field of grouting materials, and in particular relates to a novel phosphorus-magnesium-based cement grouting material and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the scale of high-speed railways, subways, tunnels and coal mining has become larger and larger, and underground projects have also attracted more and more attention. This is due to the increasing number of high-speed railways, subways, tunnels, mines, and coal mines, and the increasingly complex underground engineering environment, which gradually causes problems such as collapse, water leakage in foundation pits, water inrush, and mud gushing. In order to solve these problems, people use grouting materials to reinforce and seal underground works. [0003] At present, grouting materials can be mainly divided into cement grouting materials and chemical grouting materials....

AI Technical Summary

Problems solved by technology

Although chemical grouting materials have the advantages of good stability, good injectability, low slurry viscosity, and easy control of gel time, etc., and can be injected into relatively small cracks or pores in rock and soil, their disadvantages lie in: forming Compared with the "stone body" formed by cement grouting materials, the strength of the "stone body" is lower, the durability is poor, there is a certain degree of toxicity, it pollutes the environment and is expensive

[0004] Chinese patent CN104671739B discloses "A self-absorbing type coal mine safety double-fluid grouting material and its preparation method", which uses water glass and isocyanate to react, and uses the heat generated to trigger the polymerization of double bonds in the reaction system , so that the heat storage temperature of the slurry after solidification is reduced, and the mechanical properties of the grouting material are improved at the same time, but the production process of water glass causes serious pollution to the environment, and the country has gradually restricted production

[0005] Chinese patent CN201510719840.8 discloses "A Modified Grouting Material", which is composed of Portland cement, aluminate cement, polymer emulsion, mineral admixture and various additives. Through the flexibility and The rigidity of mineral admixtures is jointly modified to obtain grouting materials with good performance, but the insufficient permeability of this type of product results in a small repair range, poor deep expansion ability, and insufficient repair ability for deep cracks and narrow cracks

[0006] Chinese patent CN201210002291.9 discloses "A Polyurethane Grouting Water Plugging-Reinforcement Material and Its Preparation Method and Application Method", which includes two components, A component is polyether polyol and auxiliary materials, and B component is isocyanate or its pre- Mixture, used for grouting-water plugging and reinforcement, the reaction speed is very fast, the reaction starts in 20s and basically ends in 90s, the reaction time can be adjusted according to the project situation, but the cost of this kind of product is high, it will foam when it meets water, and it can be adjusted on site Poor performance, it is difficult to meet the current engineering needs, and it is difficult to be widely used

However, the current traditional magnesium phosphate cement has the following problems: (1) The adjustable range of setting time is small; (2) The slurry is prone to precipitation, consolidation, and peeling after standing before use, which affects the construction; (3) The friction between the slurry particles Strong force, limited permeability

The repairing material takes a short time to repair and does not affect the construction, but the friction between the grout particles is large and the permeability is insufficient, so it is difficult to repair deep cracks and narrow cracks