阅读说明：本技术 一种氯氧镁水泥基双液注浆材料及其制备方法 (Magnesium oxychloride cement-based double-liquid grouting material and preparation method thereof ) 是由 金祖权 王雨利 于 2021-09-03 设计创作，主要内容包括：本发明属于建筑工程加固技术领域,具体涉及一种氯氧镁水泥基双液注浆材料及其制备方法。本发明的双液注浆材料由A料浆和B料浆等体积混合而成,其中,A料浆由轻烧氧化镁粉、减水剂一、羟丙基甲基纤维素与水混合而成,B料浆由六水氯化镁、磷酸二氢钾、磷酸二氢钠、减水剂二、羟丙基甲基纤维素与水混合而成。本发明的氯氧镁水泥基双液注浆材料充分利用氯氧镁水泥具有早强的特点,再通过外加剂的作用,达到速凝快硬的效果。本发明的双液注浆材料可根据工程需要,初凝时间可调整缩短至1min以内,终凝时间可调整缩短至3min以内,2h抗压强度可达到10MPa。(The invention belongs to the technical field of building engineering reinforcement, and particularly relates to a magnesium oxychloride cement-based two-liquid grouting material and a preparation method thereof. The double-liquid grouting material is formed by mixing a slurry A and a slurry B in equal volume, wherein the slurry A is formed by mixing light-burned magnesium oxide powder, a first water reducing agent, hydroxypropyl methyl cellulose and water, and the slurry B is formed by mixing magnesium chloride hexahydrate, monopotassium phosphate, sodium dihydrogen phosphate, a second water reducing agent, hydroxypropyl methyl cellulose and water. The magnesium oxychloride cement-based two-liquid grouting material fully utilizes the early strength characteristic of magnesium oxychloride cement, and achieves the effect of quick setting and hardening through the action of the additive. The double-liquid grouting material can be adjusted and shortened to be within 1min in initial setting time and within 3min in final setting time according to engineering requirements, and the compressive strength can reach 10MPa in 2 h.)

1. The magnesium oxychloride cement-based double-liquid grouting material is characterized in that the double-liquid grouting material is formed by mixing slurry A and slurry B in equal volume; wherein:

the slurry A consists of powder A and water in a weight ratio of 100: 35-50;

the powder A consists of the following raw materials in parts by weight: 95-98 parts of light-burned magnesia powder, 1-3 parts of a water reducing agent and 0.5-2 parts of hydroxypropyl methyl cellulose;

the slurry B consists of powder B and water in a weight ratio of 100: 35-50;

the powder B consists of the following raw materials in parts by weight: 60-80 parts of magnesium chloride hexahydrate, 10-20 parts of potassium dihydrogen phosphate, 10-20 parts of sodium dihydrogen phosphate, 3-5 parts of a water reducing agent II and 0.5-2 parts of hydroxypropyl methyl cellulose.

2. The magnesium oxychloride cement-based two-fluid grouting material as claimed in claim 1, wherein the light-burned magnesia powder is light-burned magnesia of grade of CBM85 and above in table 1 of "light-burned magnesia" YB/T5206-2004 standard of ferrous metallurgy industry.

3. The magnesium oxychloride cement-based two-fluid grouting material as claimed in claim 2, wherein the ratio of the light-burned magnesia powderSurface area of not less than 400m²/kg。

4. The magnesium oxychloride cement-based biliquid grouting material of claim 1, wherein the first water reducing agent and the second water reducing agent are both commercially available naphthalene powder water reducing agents.

5. The magnesium oxychloride cement-based biliquid grouting material of claim 4, wherein the water reducing rates of the first water reducing agent and the second water reducing agent are not less than 20%.

6. The magnesium oxychloride cement-based biliquid grouting material of claim 1, wherein the MgCl in the magnesium chloride hexahydrate₂·6H₂The mass content of O is not less than 85%.

7. The magnesium oxychloride cement-based two-fluid grouting material as claimed in claim 1, wherein the potassium dihydrogen phosphate is potassium dihydrogen phosphate which meets the standards of chemical industry "fertilizer-grade potassium dihydrogen phosphate" HG/T2321-2016 Table 1 and above.

8. The magnesium oxychloride cement-based biliquid grouting material of claim 1, wherein the sodium dihydrogen phosphate is a product that meets the requirements in table 1 of "by-product sodium dihydrogen phosphate" Q/371426LS 006-2016 (r.p.).

9. The magnesium oxychloride cement-based two-fluid grouting material of claim 1, wherein the viscosity of the 2% aqueous solution of hydroxypropyl methylcellulose is from 10 to 20 ten thousand mPa-s.

10. The preparation method of the magnesium oxychloride cement-based two-fluid grouting material as claimed in any one of claims 1 to 9, wherein the preparation method comprises the following steps:

step one, weighing corresponding raw materials according to the weight parts of the powder A and the powder B, and uniformly mixing to obtain the powder A and the powder B respectively;

step two, uniformly mixing the powder component A and water in proportion to prepare slurry A; uniformly mixing the powder component B and water in proportion to prepare slurry B;

and step three, uniformly mixing the slurry A and the slurry B according to the same volume to obtain the magnesium oxychloride cement-based double-liquid grouting material.

Technical Field

The invention belongs to the technical field of building engineering reinforcement, and particularly relates to a magnesium oxychloride cement-based two-liquid grouting material and a preparation method thereof.

Background

The grouting in the building engineering can realize the purposes of reinforcing surrounding rocks, blocking water and the like. Grouting materials can be divided into inorganic grouting materials and chemical grouting materials according to the chemical composition of the grouting material; according to the construction mode of the grouting material, the grouting material can be divided into a single-liquid grouting material, a double-liquid grouting material or a three-liquid grouting material. The double-liquid or three-liquid grouting material can fulfill the aims of quick reinforcement, water shutoff and the like on the premise of meeting construction requirements, and is particularly suitable for exposed surrounding rock bodies. At present, most of commonly used two-liquid grouting materials are polyurethane grouting materials, and the polyurethane grouting materials have the characteristics of quick setting and quick hardening, have good cohesiveness, but have the defects of high cost, water swelling and the like.

Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.

Disclosure of Invention

The invention aims to provide a magnesium oxychloride cement-based two-liquid grouting material and a preparation method thereof, and aims to solve the problems that the existing inorganic two-liquid grouting material is poor in construction performance, difficult in setting time regulation and the like.

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

the magnesium oxychloride cement-based double-liquid grouting material is formed by mixing slurry A and slurry B in equal volume; wherein:

the slurry A consists of powder A and water in a weight ratio of 100: 35-50;

the powder A consists of the following raw materials in parts by weight: 95-98 parts of light-burned magnesia powder, 1-3 parts of a water reducing agent and 0.5-2 parts of hydroxypropyl methyl cellulose;

the slurry B consists of powder B and water in a weight ratio of 100: 35-50;

the powder B consists of the following raw materials in parts by weight: 60-80 parts of magnesium chloride hexahydrate, 10-20 parts of potassium dihydrogen phosphate, 10-20 parts of sodium dihydrogen phosphate, 3-5 parts of a water reducing agent II and 0.5-2 parts of hydroxypropyl methyl cellulose.

In the above-mentioned magnesium oxychloride cement-based two-liquid grouting material, preferably, the light-burned magnesia powder is light-burned magnesia of grade of CBM85 and above in table 1 of "light-burned magnesia" YB/T5206-2004 in the ferrous metallurgy industry standard.

In the above-mentioned magnesium oxychloride cement-based two-liquid grouting material, preferably, the specific surface area of the light-burned magnesia powder is not less than 400m²/kg。

In the above magnesium oxychloride cement-based two-liquid grouting material, preferably, the first water reducing agent and the second water reducing agent are both commercially available naphthalene powder water reducing agents.

In the above magnesium oxychloride cement-based two-liquid grouting material, preferably, the water reducing rates of the first water reducing agent and the second water reducing agent are not less than 20%.

In the above-mentioned magnesium oxychloride cement-based two-liquid grouting material, preferably, MgCl in the magnesium chloride hexahydrate₂·6H₂The mass content of O is not less than 85%.

In the above magnesium oxychloride cement-based two-fluid grouting material, preferably, the potassium dihydrogen phosphate is a qualified product in table 1 of fertilizer-grade potassium dihydrogen phosphate HG/T2321-2016 and above in accordance with the chemical industry standard.

In the above-mentioned magnesium oxychloride cement-based two-fluid grouting material, preferably, the sodium dihydrogen phosphate is a product meeting the requirements in table 1 of "by-product sodium dihydrogen phosphate" Q/371426LS 006-2016 of texas Longsheng chemical company, ltd.

In the above-mentioned magnesium oxychloride cement-based two-pack grouting material, the viscosity of the 2% aqueous solution of hydroxypropylmethylcellulose is preferably 10 to 20 ten thousand mPa · s.

The invention also provides a preparation method of the magnesium oxychloride cement-based two-liquid grouting material, which comprises the following steps:

step one, weighing corresponding raw materials according to the weight parts of the powder A and the powder B, and uniformly mixing to obtain the powder A and the powder B respectively;

step two, uniformly mixing the powder component A and water in proportion to prepare slurry A; uniformly mixing the powder component B and water in proportion to prepare slurry B;

and step three, uniformly mixing the slurry A and the slurry B according to the same volume to obtain the magnesium oxychloride cement-based double-liquid grouting material.

Has the advantages that:

the magnesium oxychloride cement-based two-liquid grouting material fully utilizes the early strength characteristic of magnesium oxychloride cement, and achieves the effect of quick setting and hardening through the action of the additive. Meanwhile, the single-liquid storage time of the double-liquid grouting material is not less than 6h, the slurry fluidity is good, the slurry fluidity can reach 300mm, the initial setting time of the double-liquid grouting material can be adjusted and shortened to be within 1min, the final setting time can be adjusted and shortened to be within 3min according to engineering requirements, and the 2h compressive strength can reach 10 MPa. Moreover, the preparation method of the magnesium oxychloride cement-based two-liquid grouting material is simple and easy to implement, has low requirements on production equipment and personnel, has a short production period, does not generate three wastes in the whole process, and does not influence the environment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

In order to further improve the system of the grouting material, the invention researches and develops the magnesium oxychloride cement-based two-liquid grouting material so as to achieve the aims of meeting the construction requirement, realizing quick reinforcement or water plugging and the like.

The magnesium oxychloride cement-based two-liquid grouting material is formed by mixing slurry A and slurry B in equal volume; wherein the slurry A consists of powder A and water in a weight ratio of powder A to water of 100 to (35-50) (for example, 100: 35, 100: 40, 100: 45 or 100: 50), and the slurry B consists of powder B and water in a weight ratio of powder B to water of 100 to (35-50) (for example, 100: 35, 100: 40, 100: 45 or 100: 50);

the powder A consists of the following raw materials in parts by weight: 95-98 parts (such as 95 parts, 96 parts, 97 parts or 98 parts) of light-burned magnesia powder, 1-3 parts (such as 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts) of a water reducing agent, and 0.5-2 parts (such as 0.5 part, 1 part, 1.5 parts or 2 parts) of hydroxypropyl methyl cellulose;

the powder B consists of the following raw materials in parts by weight: 60-80 parts (for example, 60 parts, 65 parts, 70 parts, 75 parts or 80 parts) of magnesium chloride hexahydrate, 10-20 parts (for example, 10 parts, 12 parts, 14 parts, 16 parts or 20 parts) of potassium dihydrogen phosphate, 10-20 parts (for example, 10 parts, 12 parts, 14 parts, 16 parts or 20 parts) of sodium dihydrogen phosphate, 3-5 parts (for example, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts) of a water reducing agent, and 0.5-2 parts (for example, 0.5 part, 1 part, 1.5 parts or 2 parts) of hydroxypropyl methyl cellulose.

It can be understood that the first water reducing agent and the second water reducing agent can be the same or different, and the invention does not need to be specially required. In the following examples, both water reducing agents are the same and therefore are not distinguished and are referred to as "water reducing agents".

In the magnesium oxychloride cement-based two-liquid grouting material, the main chemical component of the light-burned magnesia powder is MgO, and the light-burned magnesia powder is mixed with MgCl in a magnesium chloride aqueous solution₂(provided by magnesium chloride hexahydrate) and H₂O reaction to form 5Mg (OH)₂·MgCl₂·8H₂O and 3Mg (OH)₂·MgCl₂·8H₂O crystal phase, thereby forming a relatively dense and hard hardened body; the potassium dihydrogen phosphate and the sodium dihydrogen phosphate have the function of accelerating the hardening of the magnesium oxychloride cement, namely shortening the setting time of the magnesium oxide powder and the magnesium chloride aqueous solution, and can improve the water resistance of the magnesium oxychloride cement; the water reducing agent can improve the fluidity of the slurry; the hydroxypropyl methyl cellulose can adjust the viscosity of the slurry, and avoids the segregation phenomenon when the fluidity is high.

The light-burned magnesia powder is light-burned magnesia which meets the grade of CBM85 and above (namely the mark is CBM85 to CBM96) in the ferrous metallurgy industry standard YB/T5206-2004 table 1, and the specific surface area is not less than 400m²/kg。

The water reducing agent is a commercial naphthalene powder water reducing agent, and the water reducing rate is not less than 20%.

The hydroxypropylmethylcellulose is commercially available white powdery hydroxypropylmethylcellulose and has a viscosity of 10 to 20 ten thousand mPas (viscosity of a 2% aqueous solution by mass, for example, 10 to 12, 14, 16 or 20 ten thousand mPas).

Magnesium chloride hexahydrate as carnallite (KMgCl)₃·6H₂O) and a by-product of KCl extraction, and MgCl₂·6H₂The mass content of O is not less than 85%.

The monopotassium phosphate is qualified products in the standard of chemical industry, namely fertilizer-grade monopotassium phosphate HG/T2321-2016 (Table 1) and above.

The sodium dihydrogen phosphate is a product meeting the requirements in Table 1 of the enterprise standard of the German Hirsson chemical company, namely the byproduct sodium dihydrogen phosphate Q/371426LS 006-2016.

The preparation method of the magnesium oxychloride cement-based two-liquid grouting material comprises the following steps:

step one, weighing corresponding raw materials according to the weight parts of the powder A and the powder B, and uniformly mixing to obtain the powder A and the powder B respectively;

step two, uniformly mixing the powder A component and water according to the weight ratio of the powder A to the water of 100 to (35-50) to prepare slurry A; uniformly mixing the powder B component and water according to the weight ratio of the powder B to the water of 100 to (35-50) to prepare slurry B;

and step three, uniformly mixing the slurry A and the slurry B according to the same volume to obtain the magnesium oxychloride cement-based double-liquid grouting material.

Example 1

The magnesium oxychloride cement-based two-liquid grouting material is prepared by mixing slurry A and slurry B according to the volume ratio of 1:1, wherein: the slurry A is prepared by mixing 970g of light-burned magnesia powder, 20g of water reducing agent, 10g of hydroxypropyl methyl cellulose and 380g of water, and the slurry B is prepared by mixing 660g of magnesium chloride hexahydrate, 150g of potassium dihydrogen phosphate, 150g of sodium dihydrogen phosphate, 30g of water reducing agent, 10g of hydroxypropyl methyl cellulose and 380g of water.

The preparation method of the magnesium oxychloride cement-based two-liquid grouting material comprises the following steps:

step one, weighing light-burned magnesium oxide, a water reducing agent and hydroxypropyl methyl cellulose according to the weight, and uniformly mixing to obtain powder A;

weighing magnesium chloride hexahydrate, monopotassium phosphate, sodium dihydrogen phosphate, a water reducing agent and hydroxypropyl methyl cellulose according to the weight, and uniformly mixing to obtain powder B;

step three, mixing 1000g of powder A and 380g of water, and stirring uniformly to obtain slurry A;

step four, mixing and stirring 1000g of the powder B and 380g of water uniformly to obtain slurry B;

and step five, uniformly mixing the slurry A and the slurry B according to the volume ratio of 1:1 to obtain the magnesium oxychloride cement-based two-liquid grouting material, and grouting by using a two-liquid grouting pump.

The sampling detection is as follows: the single-liquid storage time of the slurry A and the slurry B is respectively 6 hours and 55 minutes and 8 hours and 30 minutes, and the single-liquid fluidity of the slurry A and the slurry B is respectively 325mm and 335 mm; the initial setting time of the mixed slurry is 55s, the final setting time is 2min19s, and the 2h compressive strength is 11.2 MPa.

The tests refer to the national standard GB8076-2008 'concrete admixture' to respectively test the single-liquid storage time, the single-liquid fluidity, the initial setting time and the final setting time of the double-liquid grouting material and the compressive strength. The detection methods in other examples and comparative examples are the same as those in this example, and are not described again.

Example 2

The magnesium oxychloride cement-based two-liquid grouting material is prepared by mixing slurry A and slurry B according to the volume ratio of 1:1, wherein: the slurry A is prepared by mixing 980g of light-burned magnesia powder, 15g of water reducing agent, 5g of hydroxypropyl methyl cellulose and 450g of water, and the slurry B is prepared by mixing 700g of magnesium chloride hexahydrate, 150g of potassium dihydrogen phosphate, 120g of sodium dihydrogen phosphate, 20g of water reducing agent, 10g of hydroxypropyl methyl cellulose and 450g of water.

The preparation method of the magnesium oxychloride cement-based two-liquid grouting material comprises the following steps:

step one, weighing light-burned magnesium oxide, a water reducing agent and hydroxypropyl methyl cellulose according to the weight, and uniformly mixing to obtain powder A;

weighing magnesium chloride hexahydrate, monopotassium phosphate, sodium dihydrogen phosphate, a water reducing agent and hydroxypropyl methyl cellulose according to the weight, and uniformly mixing to obtain powder B;

step three, mixing 1000g of powder A and 450g of water, and stirring uniformly to obtain slurry A;

step four, mixing 1000g of the powder B and 450g of water, and stirring uniformly to obtain slurry B;

and step five, uniformly mixing the slurry A and the slurry B according to the volume ratio of 1:1 to obtain the magnesium oxychloride cement-based two-liquid grouting material, and grouting by using a two-liquid grouting pump.

The sampling detection is as follows: the single-liquid storage time of the slurry A and the slurry B is respectively 7 hours and 30 minutes and 9 hours and 50 minutes, and the single-liquid fluidity of the slurry A and the slurry B is respectively 335mm and 345 mm; the initial setting time of the mixed slurry is 1min15s, the final setting time is 2min50s, and the 2h compressive strength is 10.8 MPa.

Example 3

The difference between the magnesium oxychloride cement-based two-fluid grouting material of the embodiment and the embodiment 1 is that: the water addition amount for preparing slurry A and slurry B is different, and other parameters are the same as those in example 1, and are not described again. The water addition amount for the slurry a and the slurry B during the preparation (the water addition amount for the two slurries in each experiment is the same) and the performance test results of the finally prepared slurry a, slurry B and the two-fluid grouting material are shown in table 1 below.

TABLE 1 Effect of Water addition on Dual fluid grouting Material Performance

As can be seen from table 1 in conjunction with the data of example 1, the storage time of slurry a and slurry B is gradually prolonged as the amount of added water is increased; the fluidity of the slurry A and the slurry B is gradually increased; the initial setting time and the final setting time of the double-liquid grouting material are gradually prolonged; the compressive strength of the double-liquid grouting material 2h is gradually reduced. When the water adding amount is small, the slurry is too thick and cannot meet the pumping construction requirement; when the water adding amount is large, the slurry can be isolated, so that the construction is also influenced. Therefore, it is recommended to set the water addition amount within a range of 350 to 500 g.

Example 4

The difference between the magnesium oxychloride cement-based two-fluid grouting material of the embodiment and the embodiment 1 is that: the addition amount of the light-burned magnesia powder is different when the slurry A is prepared, and other parameters are the same as those in the example 1, and are not described again. The addition amount of the light-burned magnesia powder during the preparation of the slurry A and the performance test results of the finally prepared slurry A, slurry B and two-fluid grouting material are shown in the following table 2.

TABLE 2 influence of the amount of light-burned MgO powdered material added on the Properties of the two-fluid grouting Material

As can be seen from table 2 in conjunction with the data of example 1, the storage time of slurry a is gradually shortened and the fluidity of slurry a is gradually decreased as the amount of the light-burned magnesia powder is increased, wherein the slurry tends to segregate when the amount of the light-burned magnesia powder is small, and the slurry is viscous when the amount thereof is large, thereby affecting the construction both when it is small and when it is large. The initial setting time and the final setting time of the double-liquid grouting material are both shortened and then prolonged, and correspondingly, the compressive strength of the double-liquid grouting material for 2h is also increased and then reduced. The comprehensive properties suggest that the amount of the light-burned magnesium oxide powder is limited to 950-980 g.

Example 5

The difference between the magnesium oxychloride cement-based two-fluid grouting material of the embodiment and the embodiment 1 is that: the addition amount of magnesium chloride hexahydrate in the preparation of slurry B is different, and other parameters are the same as those in example 1, and are not described again. The addition amount of magnesium chloride hexahydrate during preparation of slurry B and the performance test results of the finally prepared slurry A, slurry B and two-liquid grouting material are shown in the following table 3.

TABLE 3 influence of the amount of magnesium chloride hexahydrate on the Properties of the biliquid grouting Material

As can be seen from the data in Table 3 in combination with example 1, the storage time of the slurry B is gradually prolonged and the fluidity of the slurry B is gradually increased with the increase of the amount of magnesium oxychloride; the initial setting time and the final setting time of the double-liquid grouting material are both shortened and prolonged; the compressive strength of 2h is increased and then reduced. The amount of magnesium chloride is 600-800 g, and all performances of the double-liquid grouting material are good, so that the amount of magnesium chloride hexahydrate is recommended to be 600-800 g.

Comparative example 1

The two-fluid grouting material of the comparative example is different from the grouting material of example 1 in that: a component was removed from slurry a and slurry B, and other parameters were the same as in example 1, and thus the description thereof is omitted. The performance test results of a certain component on the finally prepared slurry A, slurry B and two-liquid grouting material are shown in the following table 4.

TABLE 4 Effect of certain Components on the Performance of two-fluid grouting materials

Note: since the slurry A contains no phosphate, the two rows of phosphate correspond to no change, and are indicated by "-".

As can be seen from the data in table 4 in combination with example 1, after a certain component is removed, the performance of the two-fluid grouting material is affected to different degrees, wherein potassium dihydrogen phosphate and sodium dihydrogen phosphate are removed, and the initial setting time and the final setting time of the two-fluid grouting material are mainly affected; after the water reducing agent is removed, the fluidity of the slurry is obviously reduced, so that the construction is influenced; after the hydroxypropyl methyl cellulose is removed, the cohesiveness of the slurry is poor, and the segregation and delamination phenomena are easy to occur.

Comparative example 2

The two-fluid grouting material of the comparative example is different from the grouting material of example 1 in that: all the phosphates in the powder B are monopotassium phosphate or all the phosphates are sodium dihydrogen phosphate, and the total addition amount and other parameters of the phosphates are the same as those in the embodiment 1, and are not described again. The effect of the change in the kind of phosphate on the properties of the finally prepared slurry a, slurry B, and two-fluid grouting materials is shown in table 5 below.

TABLE 5B Effect of changes in the phosphate type of the slurries on the Performance of the two-fluid grouting materials

As can be seen from the data in Table 5 in combination with example 1, the single blend of potassium dihydrogen phosphate and sodium dihydrogen phosphate has less influence on the storage time and fluidity of the B slurry than the blend, but the initial setting time and final setting time of the two-fluid grouting material are prolonged and the 2h compressive strength is reduced compared with the single blend. That is, the blend of potassium dihydrogen phosphate and sodium dihydrogen phosphate is more advantageous in setting time and 2h compressive strength than the blend alone, and therefore, the blend is recommended.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.