Liquid two-component rapid grouting reinforcement material and grouting method thereof

Abstract

The invention provides a liquid two-component rapid grouting reinforcement material and a grouting method thereof, and belongs to the technical field of grouting reinforcement materials. According to the technical scheme, the quick-hardening cement-based water reducer comprises a component A and a component B. The component A is a liquid cement-based suspension with an organic carbonate solvent as a continuous phase and comprises quick-hardening sulphoaluminate cement, a polycarboxylate superplasticizer, boric acid and the organic carbonate solvent. And the component B is a sodium aluminate aqueous solution. The method has the beneficial effects that the organic carbonate continuous-phase liquid suspension consisting of the quick-hardening sulphoaluminate cement and the functional additive is mixed with the sodium aluminate aqueous solution on line according to a set volume ratio, so that the permeability-pumpability before injection and the quick setting-early strength after injection are considered; and the construction efficiency and the reinforcement reliability under the complex working condition are improved, operation is easy and convenient, and transportation and storage are convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grouting reinforcement material, and particularly relates to a liquid two-component rapid grouting reinforcement material and a grouting method thereof. BACKGROUND

[0002] In the engineering of mine roadway, underground cavern, tunnel surrounding rock, concrete crack repair and water prevention and control, grouting material is widely used in crack filling, stratum reinforcement and water inrush plugging. The existing cement-based, geopolymer-based, high-water rapid-setting and other grouting systems generally face a dilemma: on the one hand, in order to obtain permeability, sufficient flow time needs to be maintained, but early strength and plugging speed are sacrificed; on the other hand, in order to pursue early strength and rapid setting, it is easy to cause “mixed setting”, resulting in poor pumping and difficult to penetrate and fill. In the field, there are often problems such as large measurement error of pre-mixed powder, complex process, sensitivity to environmental temperature, insufficient early bearing capacity and the like. SUMMARY

[0003] The present application aims to provide a liquid two-component rapid grouting reinforcement material and a grouting method thereof, which are characterized by mixing an organic carbonate continuous phase liquid suspension of fast-hardening sulphoaluminate cement and functional additives with a sodium aluminate aqueous solution in a set volume ratio online, taking into account the permeability-pumpability before injection and the rapid setting-early strength after injection, improving the construction efficiency and reinforcement reliability under complex conditions, and being simple to operate, convenient to transport and store.

[0004] The present application is achieved by the following measures: A liquid two-component rapid grouting reinforcement material, characterized in that it comprises component A and component B; the component A is a liquid cement-based suspension with an organic carbonate solvent as the continuous phase, comprising fast-hardening sulphoaluminate cement, polycarboxylate superplasticizer, boric acid and organic carbonate solvent; the component B is a sodium aluminate aqueous solution.

[0005] The present application also has the following specific features: The component A comprises 80-100 parts of fast-hardening sulphoaluminate cement, 0.1-2 parts of polycarboxylate superplasticizer, 0.1-1 part of boric acid and 50-70 parts of organic carbonate solvent.

[0006] The organic carbonate solvent is propylene carbonate.

[0007] The component A is a liquid cement-based suspension with an organic carbonate (preferably propylene carbonate) as the continuous phase, which is composed of fast-hardening sulphoaluminate cement, polycarboxylate superplasticizer and boric acid. The principle is that the organic carbonate provides a polar continuous phase to keep the component A in liquid state and pumpable for a long time, and the water phase of component B is miscible with each other instantly after mixing, so that the wetted cement particles are quickly released into hydration; the fast-hardening sulphoaluminate cement quickly generates AFt needle crystal framework in the water phase, bringing fast setting and early strength; the polycarboxylate superplasticizer is adsorbed and dispersed to reduce the viscosity; the boric acid reacts with Ca2+ to form a complex, which can reduce the solubility of AFt and promote the formation of AFt.2+ Al(OH)4 - Complexation inhibits transient nucleation, avoids flash coagulation, and forms an adjustable balance with the coagulation promoter; Component B is an aqueous solution of sodium aluminate, providing OH- - Raise pH and supply Al(OH)4 - It accelerates the dissolution and redeposition of aluminum-rich phases, promotes the rapid nucleation and growth of AFt, and serves as an equivalent water-cement ratio for water source closure; its concentration and metering, combined with the dosage of boric acid and the dispersing effect of polycarboxylic acid, constitute a ternary balance of "promoting coagulation, slowing coagulation, and dispersing".

[0008] The components A and B are mixed online and statically to form a pumpable grout, with the volume ratio of component A to component B being 4:1.

[0009] After the two components are mixed online in a static mixer at a fixed volume ratio, the carbonate / water miscibility and rapid particle dispersion occur first. The slurry maintains low viscosity and low surface tension for 0-60s to fully penetrate fine cracks. Subsequently, initial setting occurs at about 1.5-2.0min, final setting occurs at 10-20min, and early strength is formed within ≤2h (typically 10-15 MPa compressive strength and 3-4 MPa flexural strength at 2h), achieving the comprehensive effect of "infiltration before setting, rapid sealing and early load bearing".

[0010] The grouting method for the grouting reinforcement material includes the following steps: S1, connect component A and component B to the two inlets of the proportional metering pump respectively; S2, the grouting reinforcement material is obtained by measuring and mixing components A and B in a volume ratio of 4:1 in a static mixer. S3, inject the grouting reinforcement material into the crack or pore medium under the target grouting pressure until the predetermined grout absorption amount is reached; S4, allow the grouting reinforcement material to solidify into a reinforced body under ambient temperature conditions.

[0011] The beneficial effects of this invention are as follows: This invention mixes an organic carbonate continuous phase liquid suspension composed of rapid-hardening sulfoaluminate cement and functional additives with an aqueous sodium aluminate solution online at a set volume ratio, taking into account both the permeability and pumpability before injection and the rapid setting and early strength after injection, thereby improving the construction efficiency and reinforcement reliability under complex working conditions. It is also simple to operate, convenient to transport and store. Both liquids are in liquid state and can be directly metered and mixed online, which significantly improves the operability and continuity of construction. Flowability and early strength can be achieved simultaneously: after mixing, the mixture maintains flow for a short period to improve penetration, and then solidifies quickly to achieve a high 2-hour strength, meeting the requirements for rapid plugging and early load-bearing. Detailed Implementation

[0012] To clearly illustrate the technical features of the present scheme, the present scheme is described below through a specific implementation.

[0013] Embodiment 1 A liquid two-component rapid grouting reinforcement material, comprising component A and component B; component A is a liquid cement-based suspension with organic carbonate solvent as the continuous phase, comprising fast-hardening sulphoaluminate cement, polycarboxylate superplasticizer, boric acid and organic carbonate solvent; component B is an aqueous sodium aluminate solution.

[0014] Component A comprises fast-hardening sulphoaluminate cement 80-100 parts, polycarboxylate superplasticizer 0.1-2 parts, boric acid 0.1-1 part and organic carbonate solvent 50-70 parts.

[0015] The organic carbonate solvent is propylene carbonate.

[0016] Component A is a liquid cement-based suspension with organic carbonate (preferably propylene carbonate) as the continuous phase, composed of fast-hardening sulphoaluminate cement, polycarboxylate superplasticizer and boric acid. The principle is that the organic carbonate provides a polar continuous phase to keep component A liquid and pumpable for a long time, and the mixture is immediately miscible with the water phase of component B, rapidly releasing the wetted cement particles into hydration; the fast-hardening sulphoaluminate cement rapidly generates AFt needle crystal framework in the water phase, bringing fast setting and early strength; the polycarboxylate superplasticizer adsorbs and disperses to reduce viscosity; the boric acid complexes with Ca 2+ / Al(OH)4 - to inhibit instantaneous nucleation and avoid flash setting, and forms a controllable balance with the setting accelerator; Component B is an aqueous sodium aluminate solution, which provides OH - to raise the pH and supply Al(OH)4 - to accelerate the dissolution-redeposition of the aluminate phase, promote the rapid nucleation and growth of AFt, and at the same time act as a water source to close the equivalent water-binder ratio; its concentration, together with the dosage of boric acid and the dispersion effect of polycarboxylate, forms a ternary balance of "setting accelerator-retarder-dispersion".

[0017] Component A and component B are mixed online by metering and static mixing to form a pumpable grouting slurry, and the volume ratio of component A to component B is 4:1.

[0018] After the two components are mixed online by fixed-ratio metering and static mixing, carbonates / water miscibility and particle rapid dispersion occur first, and the slurry maintains low viscosity and low surface tension for 0-60s to fully penetrate fine cracks; then initial setting occurs at about 1.5-2.0min, final setting at 10-20min, and ≤2h to form an early-strength load-bearing material (typical 2h compressive strength 10-15MPa, flexural strength 3-4MPa), achieving the comprehensive effect of "penetration before setting, rapid plugging and early load bearing".

[0019] The grouting method of the grouting reinforcement material comprises the following steps: S1, respectively input component A and component B into two liquid inlets of a fixed ratio metering pump; S2, measure and mix component A and component B in a static mixer in a volume ratio of 4:1 to obtain a grouting reinforcement material; S3, inject the grouting reinforcement material into fissure or pore medium under target grouting pressure until a predetermined grouting amount is reached; S4, solidify the grouting reinforcement material to form a reinforcement body under ambient temperature conditions.

[0020] Example 2 A liquid two-component rapid grouting reinforcement material, comprising component A: 100 parts of fast-hardening sulphoaluminate cement, 1.5 parts of polycarboxylic acid water reducer, 0.9 parts of boric acid and 60 parts of propylene carbonate; Component B is an aqueous sodium aluminate solution; After on-line metering and static mixing of component A and component B, a pumpable grouting slurry is formed, and the volume ratio of component A to component B is 4:1.

[0021] The technical features not described in the present application can be realized by or using the prior art, which will not be described here. Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary skilled in the art within the scope of the present application should also be within the protection scope of the present application.

Claims

1. A liquid two-component rapid grouting reinforcement material, characterized in that, The composition comprises component A and component B; the component A is a liquid cement-based suspension with organic carbonate solvent as continuous phase, comprising fast-hardening sulphoaluminate cement, polycarboxylate superplasticizer, boric acid and organic carbonate solvent; the component B is sodium aluminate aqueous solution.

2. The liquid two-component rapid grouting reinforcement material according to claim 1, characterized in that, The component A comprises fast-hardening sulphoaluminate cement 80-100 parts, polycarboxylate superplasticizer 0.1-2 parts, boric acid 0.1-1 part and organic carbonate solvent 50-70 parts.

3. The liquid two-component rapid grouting reinforcement material according to claim 2, characterized in that, The organic carbonate solvent is propylene carbonate.

4. The liquid two-component rapid grouting reinforcement material according to claim 3, characterized in that, The component A and the component B form pumpable grouting slurry after on-line metering and static mixing, and the volume ratio of the component A to the component B is 4:

1.

5. The liquid two-component rapid grouting reinforcement material according to any one of claims 1-4, characterized in that, The grouting method of the grouting reinforcement material comprises the following steps: S1, the component A and the component B are respectively connected to the two liquid inlets of the fixed-ratio metering pump; S2, the component A and the component B are on-line mixed in the static mixer according to the volume ratio of 4:1 to obtain the grouting reinforcement material; S3, the grouting reinforcement material is injected into the fissure or pore medium under the target grouting pressure until the predetermined grouting amount is reached; and S4, the grouting reinforcement material is solidified to form the reinforcement body under the ambient temperature condition.