阅读说明：本技术 一种用于注浆材料的复合添加剂及注浆材料 (Composite additive for grouting material and grouting material ) 是由 刘超林 于 2019-04-09 设计创作，主要内容包括：本发明提供了一种用于注浆材料的复合添加剂及注浆材料,所述复合添加剂按重量份计包括如下组分：聚羧酸减水剂1份～3份、膨润土2份～5份、磷酸二氢镁2份～4份、聚合硫酸铝0.5份～2份、硫铝酸钙2份～6份、纤维素醚0.5份～1份和聚丙烯腈纤维0.2份～0.8份。本发明所述的复合添加剂加入到水泥类浆液(尤其是硅酸盐类水泥)中,能够调整和改变水泥浆液的物理力学性质,明显提高水泥类浆液围岩加固截水堵漏、地质构造治理工程等效果。(The invention provides a composite additive for a grouting material and the grouting material, wherein the composite additive comprises the following components in parts by weight: 1 to 3 portions of polycarboxylic acid water reducing agent, 2 to 5 portions of bentonite, 2 to 4 portions of magnesium dihydrogen phosphate, 0.5 to 2 portions of polyaluminium sulfate, 2 to 6 portions of calcium sulphoaluminate, 0.5 to 1 portion of cellulose ether and 0.2 to 0.8 portion of polyacrylonitrile fiber. The composite additive is added into cement grout (especially silicate cement), can adjust and change the physical and mechanical properties of the cement grout, and obviously improves the effects of reinforcing, water-stopping, plugging, treating geological structure engineering and the like of cement grout surrounding rock.)

1. The composite additive for the grouting material is characterized by comprising the following components in parts by weight:

2. the additive complex as claimed in claim 1, wherein the additive complex comprises the following components in parts by weight:

3. the additive package according to claim 1, wherein the mass ratio of magnesium dihydrogen phosphate to polyaluminium sulfate is 2: 1.

4. The composite additive according to claim 1, wherein the mass ratio of the cellulose ether to the polyacrylonitrile fiber is 3: 2.

5. A grouting material, characterized in that the grouting material comprises Portland cement and the composite additive as claimed in any one of claims 1-4, wherein the composite additive is added in an amount of 7-10% by mass of the Portland cement.

6. The grouting material of claim 5, wherein the additive amount of the composite additive is 8-9% of the mass of the portland cement.

7. The grouting material according to claim 5 or 6, wherein the water-cement ratio of the grouting material is 0.4-0.55.

8. The grouting material of claim 7, wherein the water-cement ratio of the grouting material is 0.45-0.5.

Technical Field

The invention belongs to the field of coal mine medium-length hole grouting materials, and relates to a composite additive for a grouting material and the grouting material.

Background

With the increase of the mining depth of the coal mine, the surrounding rock of the roadway presents obvious soft rock deformation characteristics, the sliding deformation motion of the surrounding rock becomes stronger and stronger, and the supporting of the roadway engineering is more difficult. With the development of grouting technology, full-section grouting becomes one of the effective important means for surrounding rock reinforcement, water interception and leakage stoppage, geological structure treatment engineering and the like. The grouting material is an indispensable component in the grouting technology, and the grouting can play a reinforcing role mainly as a result of liquid-phase to solid-phase transformation of the grouting material in the grouting process.

In the grouting construction, one or more grouting materials can be correctly and reasonably selected, and the success or failure and the technical and economic benefits of the grouting project can be directly influenced.

The current grouting materials are mainly divided into two categories:

one is a non-particulate material, including inorganic and organic materials, also known as a chemical slurry. The material has the advantages of good stability, strong injectability, low viscosity, easy control of gelation time and the like, and can be injected into tiny cracks or gaps of rock mass. The common ones are acrylamides, methacrylamides, lignins, urea-formaldehyde resins, acrylates, polyurethanes, epoxy resins and malisans. But has the disadvantages that: the slurry after setting has a low strength, a low durability, a pollution to the surrounding environment, a high price, a more or less toxic nature and a flammability. Therefore, the grouting reinforcement engineering in the general roadway is less adopted.

The other is a granular material, including cement paste, clay paste, cement fly ash paste, cement-water glass paste and the like. The material has the advantages of rich raw material sources, low price, high strength after curing and the like, but has the defects of overlarge curing shrinkage rate and overlong final setting time of slurry: the curing shrinkage rate is too large, so that multiple times of grouting are needed in the grouting process to meet the engineering requirements; and the final setting time is too long, so that the grouting working efficiency is extremely low, and the grouting construction period is prolonged. As the particle material generally has the defects of longer gel time, difficult and accurate control, high water precipitation rate, poor stability, low strength increasing speed and the like, and the phenomena of slurry leakage in a large-pore stratum, poor groutability in a small-pore stratum and the like easily occur, the grouting quality is difficult to ensure. Especially cement-water glass slurry, the material is one of the commonly used economic grouting materials at present due to the advantages of good grouting property, high early strength, high calculus rate, low price and the like, but the slurry has the defects that: the stone body is large in compression amount, and the later strength is rapidly reduced; after curing in water for 28-90 days, the strength is obviously reduced, and the powder is cracked and even disintegrated after half a year, thereby losing the use value. Particularly, under the condition of drying and water loss, the drying shrinkage and disintegration are quicker, so the slurry is generally only limited to be used for reinforcing, seepage-proofing and plugging temporary underground roadway engineering.

CN108218359A discloses a cement-based high-performance micro-expansion filling grouting material, but the portland cement grouting slurry has the defects of high water precipitation rate, poor stability, long setting time, difficulty in filling micro cracks, environmental pollution in production, large energy and resource consumption, high cost and the like.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a composite additive for a grouting material and the grouting material. The composite additive is added into cement grout (especially silicate cement), can adjust and change the physical and mechanical properties of the cement grout, and obviously improves the effects of reinforcing, water-stopping, plugging, treating geological structure engineering and the like of cement grout surrounding rock.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a composite additive for a grouting material, which comprises the following components in parts by weight:

the following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.

As a preferable technical scheme of the invention, the composite additive comprises the following components in parts by weight:

as a preferable technical scheme of the invention, the mass ratio of the magnesium dihydrogen phosphate to the polymeric aluminum sulfate is 2: 1.

As a preferable technical scheme of the invention, the mass ratio of the cellulose ether to the polyacrylonitrile fiber is 3: 2.

In a second aspect, the invention provides a grouting material, which comprises portland cement and the composite additive, wherein the composite additive is added in an amount of 7-10% by mass of the portland cement.

In a preferred embodiment of the present invention, the amount of the composite additive is 8 to 9% by mass of the portland cement.

As a preferable technical scheme of the invention, the water-cement ratio of the grouting material is 0.4-0.55.

As a preferable technical scheme of the invention, the water-cement ratio of the grouting material is 0.45-0.5.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the invention, the proper additives are selected and the dosage proportion of the additives is adjusted, the additives are mixed to form the composite additive with specific properties, and through a proper water-cement proportion experiment, different physical and mechanical properties of cement grout are finally regulated and controlled, so that the purpose of meeting different grouting requirements is achieved;

(2) the grouting material has the advantages of good controllable adjustment, good slurry fluidity, random adjustment of liquid state and final setting time, obvious stable state of no separation of water and ash, no water precipitation after the final setting of the slurry, hardening into equal-volume concrete (zero shrinkage), small-amplitude random adjustment of expansion and shrinkage, excellent mechanical property and the like.

Detailed Description

In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.

The invention provides a composite additive for a grouting material, which comprises the following components in parts by weight:

the amount of the polycarboxylic acid water reducing agent can be 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts, but is not limited to the enumerated values, and other unrecited values in the numerical range are also applicable; the amount of bentonite may be 2 parts, 3 parts, 4 parts or 5 parts, but is not limited to the recited values, and other values not recited within the range of values are also applicable; magnesium dihydrogen phosphate may be used in an amount of 2 parts, 2.3 parts, 2.5 parts, 2.7 parts, 3 parts, 3.3 parts, 3.5 parts, 3.7 parts, or 4 parts, but is not limited to the recited values, and other values not recited within the range of values are also applicable; the polyaluminium sulfate may be used in an amount of 0.5 parts, 1.3 parts, 1.5 parts, 1.7 parts, 2 parts, etc., but is not limited to the recited values, and other unrecited values within the range of values are equally applicable; the calcium sulfoaluminate may be used in an amount of 2 parts, 3 parts, 4 parts, 5 parts, or 6 parts, but is not limited to the recited values, and other unrecited values within the range are equally applicable; the cellulose ether may be used in an amount of 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 part, etc., but is not limited to the recited values, and other values not recited within the range of values are also applicable; the polyacrylonitrile fiber may be used in an amount of 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts or 0.8 parts, etc., but it is not limited to the enumerated values, and other unrecited values within the numerical range may be applied.

The invention selects proper additive and adjusts the dosage proportion, so that the physical and mechanical properties of the cement grout (especially silicate cement) added with the composite additive are adjusted and improved, and the effects of reinforcing, water-intercepting, leaking stoppage, geological structure treatment engineering and the like of the cement grout surrounding rock are obviously improved.

The composite additive optimizes the composition and proportion of raw materials, and the polycarboxylic acid water reducing agent is selected to better improve the dispersion effect of cement particles, effectively increase the fluidity of cement slurry and keep good slump; the bentonite has stronger hygroscopicity and expansibility, can be dispersed into a gelatinous state and a suspended state in a liquid medium, and effectively changes the unstable state of water-cement separation of cement slurry; after the calcium sulphoaluminate meets water, a large amount of expanded crystal hydrate-hydrated calcium sulphoaluminate (namely calcium vanadine) can be produced, and moderate expansion is generated, so that the water precipitation hardening shrinkage of the calcium sulphoaluminate can be effectively compensated, and the crack resistance is greatly improved; meanwhile, magnesium dihydrogen phosphate, polyaluminium sulfate, cellulose ether and polyacrylonitrile fiber are added on the basis of the raw materials, under the combined action of the magnesium dihydrogen phosphate, the polyaluminium sulfate, the cellulose ether and the polyacrylonitrile fiber, on one hand, the hydration hardening of cement slurry can be accelerated, enough strength can be formed in a short time, and the problem of hardening speed of the cement slurry can be effectively solved; on the other hand, the injectability of the composite material can be improved, the composite material can quickly permeate into tiny cracks of surrounding rock (coal) of a roadway, and meanwhile, the composite material has excellent physical properties, is quickly solidified, does not shrink, and does not influence the material properties when meeting water.

The following technical solutions are preferred technical solutions of specific embodiments, but are not limited to the technical solutions provided by the present invention, and the technical objects and advantageous effects of the present invention can be better achieved and realized by the following technical solutions.

As a preferable technical scheme of a specific embodiment, the composite additive comprises the following components in parts by weight:

as a preferable technical scheme of the specific embodiment, the mass ratio of the magnesium dihydrogen phosphate to the polymeric aluminum sulfate is 2: 1. The magnesium dihydrogen phosphate and the polyaluminium sulfate have the optimal effect under the mass ratio.

According to a preferable technical scheme of the specific embodiment, the mass ratio of the cellulose ether to the polyacrylonitrile fiber is 3: 2. The dosage ratio of the cellulose ether and the polyacrylonitrile fiber achieves the optimal effect under the mass ratio.

The invention also provides a grouting material, which comprises the Portland cement and the composite additive, wherein the composite additive is added in an amount of 7-10% of the mass of the Portland cement, such as 7%, 7.5%, 8%, 8.5%, 9%, 9.5% or 10%, but not limited to the enumerated values, and other unrecited values in the numerical range are also applicable.

In a preferred embodiment, the additive amount of the composite additive is 8 to 9% by mass of the portland cement.

In a preferred embodiment, the water-cement ratio of the grouting material is 0.4 to 0.55, for example, 0.4, 0.42, 0.44, 0.46, 0.48, 0.5, 0.51, 0.53, or 0.55, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range of values are also applicable.

In the present invention, the water cement ratio refers to the mass ratio of water to cement and the composite additive in the grouting material, and is a conventional expression in the field.

According to the preferable technical scheme of the specific embodiment, the water-cement ratio of the grouting material is 0.45-0.5, and the grouting material provided by the invention achieves the optimal effect under the condition of the water-cement ratio.

The following are typical but non-limiting examples of the invention: