CN112321245A - Formula of sleeve grouting material - Google Patents
Formula of sleeve grouting material Download PDFInfo
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- CN112321245A CN112321245A CN202011203313.9A CN202011203313A CN112321245A CN 112321245 A CN112321245 A CN 112321245A CN 202011203313 A CN202011203313 A CN 202011203313A CN 112321245 A CN112321245 A CN 112321245A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a formula of a sleeve grouting material, which comprises the following components in parts by weight: 600 parts of cement 450-portion, 0-50 parts of sulphoaluminate cement, 5-100 parts of waste red brick grinding powder, 550 parts of sand 400-portion, 1.0-3.0 parts of water reducing agent, 0.01-0.5 part of plastic expanding agent, 0.2-0.8 part of defoaming agent, 1.0-8.0 parts of inorganic early strength agent, 0.5-3 parts of early strength type polycarboxylate water reducing agent powder and 0.5-3 parts of polycarboxylate high performance water reducing agent powder. The grouting material for connecting the reinforcing steel bar sleeve prepared by the method has high fluidity and fluidity retention capacity, high early strength, low cost and important practical value, and effectively utilizes the construction solid wastes as resources by using the waste red brick grinding powder.
Description
Technical Field
The invention belongs to the technical field of building materials, and relates to a formula of a sleeve grouting material.
Background
In the assembly type structure, the steel bar connection technology of the prefabricated part becomes the key of the whole frame structure, and the steel bar connection sleeve is used as a key stress member for forming nodes such as frame beams and columns and the like, so that the excellent stress characteristic and the repeated cyclic load action are ensured. The steel bar sleeve grouting connection joint comprises 3 parts of ribbed steel bars, a sleeve, grouting materials and the like. The connection principle is as follows: after the ribbed steel bar is inserted into the sleeve, the sleeve is filled with the non-shrinkage or micro-expansion cement-based grouting material, a gap between the sleeve and the steel bar is filled, and the grouting material is tightly meshed with the transverse rib of the steel bar and the groove or the convex rib of the inner wall of the sleeve after being hardened, so that the connection of the upper steel bar and the lower steel bar is realized. Therefore, in the prefabricated assembly type building structure, the high-performance grouting material is the key for realizing longitudinal connection, and the performance of the grouting material plays a crucial role in ensuring the safety of the prefabricated assembly type building structure. The grouting material for connecting the reinforcing steel bar sleeve is a dry mixture which is prepared by taking cement as a basic material, adding proper fine aggregate, a small amount of concrete water reducing agent and other materials, and has the performances of high fluidity, early strength, high strength, micro-expansion and the like after being stirred by adding water. However, the grouting materials for connecting the reinforcing steel bar sleeves developed at present all use natural raw materials, and the cost is high.
Therefore, there is a need to develop a sleeve grouting material formulation that overcomes the above-mentioned disadvantages.
Disclosure of Invention
The invention aims to provide a formula of sleeve grouting material.
The technical scheme of the invention is as follows:
the formula of the sleeve grouting material comprises the following components in parts by weight: 600 parts of cement 450-portion sand-containing material, 5-50 parts of sulphoaluminate cement, 5-100 parts of waste red brick grinding powder, 550 parts of sand 400-containing material, 1.0-3.0 parts of water reducing agent, 0.01-0.5 part of plastic expanding agent, 0.2-0.8 part of defoaming agent, 1.0-8.0 parts of inorganic early strength agent, 0.3-2 parts of early strength type polycarboxylate water reducing agent powder and 0.3-2 parts of polycarboxylate high performance water reducing agent powder.
Further, the cement is P.O42.5, P.O52.5 or PII 52.5, the strength grade of the sulphoaluminate cement is 42.5, 52.5 and 62.5, the particle size of the waste red brick grinding powder is 140-400 meshes, the sand is one or two of natural sand and quartz sand, the particle size of the sand is 0-2.36mm, the plastic expanding agent is a UEA type or CSA type expanding agent, the defoaming agent is organic silicon defoaming agent powder, the inorganic early strength agent is one or more of calcium nitrate, sodium sulfate and sodium silicate, and the water reduction rate of the polycarboxylic acid high-performance water reducing agent powder is more than or equal to 30%.
Further, the preparation method of the early strength type polycarboxylate superplasticizer powder comprises the following steps:
(1) adding deionized water, polyether monomer and initiator into a reaction kettle, uniformly stirring to obtain a first mixed solution, and standing at room temperature;
(2) mixing acrylic acid, methacrylic acid, acrylamide, a chain transfer agent and deionized water, uniformly stirring to prepare a mixed solution A, and dropwise adding the mixed solution A into the first mixed solution for 2.5 hours to obtain a second mixed solution;
(3) mixing a reducing agent and deionized water, uniformly stirring to prepare a mixed solution B, dropwise adding the mixed solution B into the second mixed solution for 3 hours, and stirring for 3 hours at room temperature after dropwise adding to obtain a third mixed solution;
(4) adding caustic soda flakes into the third mixed solution to neutralize until the pH value is 8-10 to obtain a liquid early-strength polycarboxylate superplasticizer, and controlling the concentration of the liquid early-strength polycarboxylate superplasticizer to be 40 wt%;
(5) and carrying out centrifugal spray drying on the liquid early-strength polycarboxylate superplasticizer to prepare early-strength polycarboxylate superplasticizer powder.
Further, the mass ratio of the polyether monomer, acrylic acid, methacrylic acid, acrylamide, an initiator, a reducing agent, a chain transfer agent and flake caustic is 100.0: 5.0-15.0: 3.0-15.0: 2.0-8.0: 0.5-1.0: 0.03 to 1.20: 0.4-1.2: 5.0 to 40.0.
Further, the polyether monomer is HPEG, the molecular weight is 2400, 3000 or 6000, the initiator is one or two of ammonium persulfate and hydrogen peroxide, the reducing agent is one or two of sodium hypophosphite, anhydrous ferrous sulfate and L-ascorbic acid, the chain transfer agent is one or two of mercaptoethanol and isopropanol, and the flake caustic is flake sodium hydroxide.
Further, in the step (1), the mass ratio of the polyether monomer to the deionized water is 1.2-1.5: 1.
Further, in the step (2), the mass of the deionized water is 3-15 times of the sum of the mass of the acrylic acid, the methacrylic acid, the acrylamide and the chain transfer agent.
Further, in the step (3), the mass of the deionized water is 100-400 times of that of the reducing agent.
Further, in the step (5), the centrifugal spray drying parameters are as follows: the air inlet temperature is 150-190 ℃, the air outlet temperature is 70-90 ℃, and the rotation speed of the centrifugal disc is 15000-.
Further, in the step (5), the water content of the early-strength polycarboxylate superplasticizer powder is less than 5%.
The invention provides a formula of sleeve grouting material, which has the following advantages:
1. the grouting material formula for connecting the steel bar sleeve prepared by the invention has excellent fluidity, fluidity retention capability and early strength performance;
2. the grouting material for connecting the reinforcing steel bar sleeves, which is prepared from the waste red brick grinding powder, effectively realizes the resource utilization of the building solid wastes, has low production cost and important practical application value.
Detailed Description
The invention aims to provide a formula of sleeve grouting material, and waste red brick grinding powder used by the formula contains a large amount of active SiO2、Al2O3The volcanic ash effect can be generated, and the thinner the brick powder is, the larger the surface energy is, the more chemical reaction acting surfaces are provided, and the higher the activity is. The sulphoaluminate cement used by the grouting material has the characteristics of high hydration speed, quick setting and hardening, and can endow the grouting material with higher early strength performance. Early strength polycarboxylic acids for use thereinThe water aqua has high water reducing rate, can promote cement hydration fast and raise the early strength of concrete. The used polycarboxylic acid high-performance water reducing agent powder comprises the following components in parts by weight: has high water reducing rate and fluidity maintaining performance. The used inorganic early strength agent can quickly promote the hydration of cement and improve the early strength of concrete. The defoaming agent used in the grouting material slurry can eliminate the content of bubbles in the grouting material slurry, improve the compactness of the slurry and increase the early and later strength of the grouting material.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. The invention is not limited to the embodiments listed but also comprises any other known variations within the scope of the invention as claimed.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
The formula of the sleeve grouting material comprises the following components in parts by weight: cement P.O42.5 and 450 parts, sulphoaluminate cement 50 parts with the strength grade of 42.5, waste red brick grinding powder 100 parts with the particle size of 140 meshes, natural sand 400 parts with the particle size of 0-2.36mm, water reducing agent 3.0 parts, UEA type expanding agent 0.01 parts, organic silicon defoaming agent powder 0.2 parts, calcium nitrate 1.0 parts, early-strength type polycarboxylate superplasticizer powder 2 parts, and polycarboxylate high-performance water reducing agent powder 0.3 parts with the water reducing rate of more than or equal to 30%.
The preparation method of the early-strength polycarboxylate superplasticizer powder comprises the following steps:
(1) adding deionized water, polyether monomer HPEG with molecular weight of 2400 and ammonium persulfate into a reaction kettle, uniformly stirring, and standing at room temperature to obtain a first mixed solution, wherein the mass ratio of the polyether monomer HPEG to the deionized water is 1.2: 1;
(2) mixing acrylic acid, methacrylic acid, acrylamide, mercaptoethanol and deionized water, wherein the mass of the deionized water is 3 times of the sum of the mass of the acrylic acid, the mass of the methacrylic acid, the mass of the acrylamide and the mass of the mercaptoethanol, uniformly stirring to prepare a mixed solution A, and dropwise adding the mixed solution A into the first mixed solution for 2.5 hours to obtain a second mixed solution;
(3) mixing sodium hypophosphite and deionized water, wherein the mass of the deionized water is 100 times of that of the sodium hypophosphite, uniformly stirring to prepare a mixed solution B, dropwise adding the mixed solution B into the second mixed solution for 3 hours, and stirring for 3 hours at room temperature after dropwise adding to obtain a third mixed solution;
(4) after the reaction is finished, adding flaky sodium hydroxide into the third mixed solution to neutralize the third mixed solution to a pH value of 8 to obtain a liquid early-strength polycarboxylate superplasticizer, and controlling the concentration of the liquid early-strength polycarboxylate superplasticizer to be 40 wt%;
(5) and (3) carrying out centrifugal spray drying on the liquid early-strength polycarboxylate superplasticizer at the conditions of air inlet temperature of 150 ℃, air outlet temperature of 70 ℃ and rotating speed of a centrifugal disc of 15000r/min to prepare early-strength polycarboxylate superplasticizer powder with the water content of less than 5%.
The mass ratio of the polyether monomer HPEG, acrylic acid, methacrylic acid, acrylamide, ammonium persulfate, sodium hypophosphite, mercaptoethanol, isopropanol and flaky sodium hydroxide is 100: 5: 3:2: 0.5: 0.03: 0.4: 5.
example 2
The formula of the sleeve grouting material comprises the following components in parts by weight: cement P.O42.5500 parts, sulphoaluminate cement with the strength grade of 52.5 parts, waste red brick grinding powder with the particle size of 300 meshes 60 parts, quartz sand with the particle size of 0-2.36mm 450 parts, water reducing agent 2 parts, CSA type expanding agent 0.3 parts, organosilicon defoaming agent powder 0.5 part, sodium nitrate and sodium sulfate 7.0 parts, early-strength polycarboxylic acid water reducing agent powder 1.2 parts, and polycarboxylic acid high-performance water reducing agent powder with the water reducing rate of more than or equal to 30 percent 1.5 parts.
The preparation method of the early-strength polycarboxylate superplasticizer powder comprises the following steps:
(1) adding deionized water, a polyether monomer HPEG with molecular weight of 3000 and hydrogen peroxide into a reaction kettle, uniformly stirring, and standing at room temperature to obtain a first mixed solution, wherein the mass ratio of the HPEG to the deionized water is 1.4: 1;
(2) mixing acrylic acid, methacrylic acid, acrylamide, isopropanol and deionized water, wherein the mass of the deionized water is 10 times of the sum of the mass of the acrylic acid, the mass of the methacrylic acid, the mass of the acrylamide and the mass of the isopropanol, uniformly stirring to prepare a mixed solution A, and dropwise adding the mixed solution A into the first mixed solution for 2.5 hours to obtain a second mixed solution;
(3) mixing anhydrous ferrous sulfate and deionized water, wherein the mass of the deionized water is 300 times of that of the anhydrous ferrous sulfate, uniformly stirring to prepare a mixed solution B, dropwise adding the mixed solution B into the second mixed solution for 3 hours, and stirring for 3 hours at room temperature after dropwise adding to obtain a third mixed solution;
(4) and (3) after the reaction is finished, adding flaky sodium hydroxide to neutralize to a pH value of 9 to obtain the liquid early-strength polycarboxylate superplasticizer, and controlling the concentration of the liquid early-strength polycarboxylate superplasticizer to be 40 wt%.
(5) And (3) carrying out centrifugal spray drying on the liquid early-strength polycarboxylate superplasticizer at the conditions of air inlet temperature of 180 ℃, air outlet temperature of 80 ℃ and rotation speed of a centrifugal disc of 18000r/min to obtain early-strength polycarboxylate superplasticizer powder with the water content of less than 5%.
The mass ratio of the polyether monomer HPEG, acrylic acid, methacrylic acid, acrylamide, hydrogen peroxide, anhydrous ferrous sulfate, isopropanol and flaky sodium hydroxide is 100: 12: 10:6: 0.8: 0.8: 1: 30.
example 3
The formula of the sleeve grouting material comprises the following components in parts by weight: the concrete comprises, by weight, cement PIII 52.5600 parts, sulphate aluminium cement with the strength grade of 62.5 parts, waste red brick grinding powder with the particle size of 400 meshes 5 parts, quartz sand with the particle size of 0-2.36mm 550 parts, a water reducing agent 1.0 part, a CSA type expanding agent 0.5 part, an organic silicon defoaming agent powder 0.8 part, sodium silicate 8.0 part, an early strength type polycarboxylic acid water reducing agent powder 0.3 part, and a polycarboxylic acid high-performance water reducing agent powder with the water reducing rate of more than or equal to 30% 2 parts.
The preparation method of the early-strength polycarboxylate superplasticizer powder comprises the following steps:
(1) adding deionized water, polyether monomer HPEG with molecular weight of 6000 and hydrogen peroxide into a reaction kettle, uniformly stirring, and standing at room temperature to obtain a first mixed solution, wherein the mass ratio of the polyether monomer HPEG to the deionized water is 1.5: 1;
(2) mixing acrylic acid, methacrylic acid, acrylamide, isopropanol and deionized water, wherein the mass of the deionized water is 15 times of the sum of the mass of the acrylic acid, the mass of the methacrylic acid, the mass of the acrylamide and the mass of the isopropanol, uniformly stirring to prepare a mixed solution A, and dropwise adding the mixed solution A into the first mixed solution for 2.5 hours;
(3) mixing L-ascorbic acid and deionized water, wherein the mass of the deionized water is 400 times that of the L-ascorbic acid, uniformly stirring to prepare a mixed solution B, dropwise adding the mixed solution B into the second mixed solution for 3 hours, and stirring for 3 hours at room temperature after dropwise adding to obtain a third mixed solution;
(4) after the reaction is finished, adding flaky sodium hydroxide into the third mixed solution to neutralize the third mixed solution to a pH value of 10 to obtain a liquid early-strength polycarboxylate superplasticizer, and controlling the concentration of the liquid early-strength polycarboxylate superplasticizer to be 40 wt%;
(5) and (3) carrying out centrifugal spray drying on the liquid early-strength polycarboxylate superplasticizer at the conditions of air inlet temperature of 190 ℃, air outlet temperature of 90 ℃ and rotation speed of a centrifugal disc of 20000r/min to obtain early-strength polycarboxylate superplasticizer powder with the water content of less than 5%.
The mass ratio of the polyether monomer HPEG, acrylic acid, methacrylic acid, acrylamide, hydrogen peroxide, L-ascorbic acid, isopropanol and flaky sodium hydroxide is 100: 15: 15:8: 1: 1.2: 1.2: 40.
in conclusion, the grouting material for connecting the reinforcing steel bar sleeve prepared by the formula has good fluidity, fluidity retention capability and early strength performance, and the crushed ground material of the waste red bricks is used, so that the problem of solid waste disposal of the building is solved, the waste is changed into valuable, the production cost is reduced, and the grouting material has good market prospect.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The formula of the sleeve grouting material is characterized by comprising the following components in parts by weight: 600 parts of cement 450-portion sand-containing material, 5-50 parts of sulphoaluminate cement, 5-100 parts of waste red brick grinding powder, 550 parts of sand 400-containing material, 1.0-3.0 parts of water reducing agent, 0.01-0.5 part of plastic expanding agent, 0.2-0.8 part of defoaming agent, 1.0-8.0 parts of inorganic early strength agent, 0.3-2 parts of early strength type polycarboxylate water reducing agent powder and 0.3-2 parts of polycarboxylate high performance water reducing agent powder.
2. The formulation of a sleeve grout material according to claim 1, wherein: the cement is P.O42.5, P.O52.5 or PII 52.5, the strength grade of the sulphoaluminate cement is 42.5, 52.5 and 62.5, the particle size of the waste red brick grinding powder is 140-400 meshes, the sand is one or two of natural sand and quartz sand, the particle size of the sand is 0-2.36mm, the plastic expanding agent is UEA or CSA expanding agent, the defoaming agent is organic silicon defoaming agent powder, the inorganic early strength agent is one or more of calcium nitrate, sodium sulfate and sodium silicate, and the water reducing rate of the polycarboxylic acid high-performance water reducing agent powder is more than or equal to 30%.
3. The formulation of claim 1, wherein the preparation method of the early strength polycarboxylate superplasticizer powder comprises the following steps:
(1) adding deionized water, polyether monomer and initiator into a reaction kettle, uniformly stirring to obtain a first mixed solution, and standing at room temperature;
(2) mixing acrylic acid, methacrylic acid, acrylamide, a chain transfer agent and deionized water, uniformly stirring to prepare a mixed solution A, and dropwise adding the mixed solution A into the first mixed solution for 2.5 hours to obtain a second mixed solution;
(3) mixing a reducing agent and deionized water, uniformly stirring to prepare a mixed solution B, dropwise adding the mixed solution B into the second mixed solution for 3 hours, and stirring for 3 hours at room temperature after dropwise adding to obtain a third mixed solution;
(4) adding caustic soda flakes into the third mixed solution to neutralize until the pH value is 8-10 to obtain a liquid early-strength polycarboxylate superplasticizer, and controlling the concentration of the liquid early-strength polycarboxylate superplasticizer to be 40 wt%;
(5) and carrying out centrifugal spray drying on the liquid early-strength polycarboxylate superplasticizer to prepare early-strength polycarboxylate superplasticizer powder.
4. The formulation of a sleeve grout material according to claim 3, wherein: the mass ratio of the polyether monomer, acrylic acid, methacrylic acid, acrylamide, an initiator, a reducing agent, a chain transfer agent and flake caustic is 100.0: 5.0-15.0: 3.0-15.0: 2.0-8.0: 0.5-1.0: 0.03 to 1.20: 0.4-1.2: 5.0 to 40.0.
5. The formulation of a sleeve grout material according to claim 3, wherein: the polyether monomer is HPEG, the molecular weight is 2400, 3000 or 6000, the initiator is one or two of ammonium persulfate and hydrogen peroxide, the reducing agent is one or two of sodium hypophosphite, anhydrous ferrous sulfate and L-ascorbic acid, the chain transfer agent is one or two of mercaptoethanol and isopropanol, and the flake caustic is flake sodium hydroxide.
6. The formulation of a sleeve grout material according to claim 3, wherein: in the step (1), the mass ratio of the polyether monomer to the deionized water is 1.2-1.5: 1.
7. The formulation of a sleeve grout material according to claim 3, wherein: in the step (2), the mass of the deionized water is 3-15 times of the sum of the mass of the acrylic acid, the methacrylic acid, the acrylamide and the chain transfer agent.
8. The formulation of a sleeve grout material according to claim 3, wherein: in the step (3), the mass of the deionized water is 100-400 times of that of the reducing agent.
9. The formulation of a sleeve grout material according to claim 3, wherein: in the step (5), the parameters of the centrifugal spray drying are as follows: the air inlet temperature is 150-190 ℃, the air outlet temperature is 70-90 ℃, and the rotation speed of the centrifugal disc is 15000-.
10. The formulation of a sleeve grout material according to claim 3, wherein: in the step (5), the water content of the early-strength polycarboxylate superplasticizer powder is less than 5%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213878A (en) * | 2021-06-16 | 2021-08-06 | 上海宝生新型建材有限公司 | Environment-friendly sleeve grouting material for connecting reinforcing steel bars |
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| CN107935516A (en) * | 2017-11-17 | 2018-04-20 | 武汉理工大学 | A kind of microdilatancy grout material that slurry is molded into for tunnel-liner vault band |
| CN110668758A (en) * | 2019-10-30 | 2020-01-10 | 安徽海螺建材设计研究院有限责任公司 | Grouting material for connecting reinforcing steel bar sleeve |
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|---|---|---|---|---|
| CN113213878A (en) * | 2021-06-16 | 2021-08-06 | 上海宝生新型建材有限公司 | Environment-friendly sleeve grouting material for connecting reinforcing steel bars |
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Application publication date: 20210205 |