CN108191346B - Prefabricated building sleeve grouting material - Google Patents
Prefabricated building sleeve grouting material Download PDFInfo
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- CN108191346B CN108191346B CN201810171404.5A CN201810171404A CN108191346B CN 108191346 B CN108191346 B CN 108191346B CN 201810171404 A CN201810171404 A CN 201810171404A CN 108191346 B CN108191346 B CN 108191346B
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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
- C04B28/04—Portland cements
-
- 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
Abstract
The invention belongs to the technical field of engineering materials, and discloses an assembly type building sleeve grouting material which is composed of the following raw materials in parts by weight: 30-40 parts of cement, 3-8 parts of superfine steel slag micro powder, 2-6 parts of phosphogypsum, 3-5 parts of ceramic microspheres, 30-50 parts of quartz sand, 20-30 parts of crushed nickel slag sand, 0.05-0.5 part of retarding and water reducing agent, 0.05-0.1 part of reinforcing agent, 0.5-2 parts of shrinkage-reducing and expansion component, 0.001-0.005 part of defoaming agent and 0.005-0.01 part of xanthan gum. The grouting material has better fluidity and strong injectability, can permeate into tiny cracks or gaps, does not bleed or isolate, and meets the requirements of assembled buildings.
Description
Technical Field
The invention belongs to the technical field of engineering materials, and particularly relates to an assembly type building sleeve grouting material.
Background
The fabricated building is a building mode which is characterized in that building materials are prefabricated into a structure in a factory, after a construction unit carries out certain treatment on the terrain, various light materials are combined by adopting a light steel structure, and the fabricated building integrates the functions of heat preservation, sound insulation, fire prevention, insect prevention, energy conservation, earthquake resistance, moisture prevention and the like, and is also called an industrial building. The construction method has the advantages of stable construction quality, convenience and rapidness in construction, labor saving and the like, and is widely popularized in recent years. In the assembly type building, the constructed linking mode mainly comprises sleeve grouting connection, grout anchor linking and indirect linking, wherein the sleeve grouting linking is mainly used, and the market share reaches 80%. As an important connecting medium between the steel bar and the sleeve, the performance of the grouting material directly influences the use performance of the assembled building, and is one of the key factors for promoting the development of the assembled building in China. Most of grouting materials in the current market are composed of cement, quartz sand, an expanding agent and a water reducing agent, and the grouting material is high in compressive strength, but has the problems of short setting time, low initial fluidity, shrinkage cracking and the like, and cannot meet engineering requirements.
Disclosure of Invention
The invention aims at the problems and provides a micro-expansion prefabricated building sleeve grouting material with high fluidity, long operable time. In order to achieve the purpose, the invention adopts the following technical scheme.
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 30-40 parts of cement, 3-8 parts of superfine steel slag micro powder, 2-6 parts of phosphogypsum, 3-5 parts of ceramic microspheres, 30-50 parts of quartz sand, 20-30 parts of crushed nickel slag sand, 0.05-0.5 part of retarding and water reducing agent, 0.05-0.1 part of reinforcing agent, 0.5-2 parts of shrinkage-reducing and expansion component, 0.001-0.005 part of defoaming agent and 0.005-0.01 part of xanthan gum.
The cement is ordinary portland cement.
Preferably, the cement is P.O 52.5 cement.
The grain size of the superfine steel slag micro powder is 3-5 um.
Preferably, the superfine steel slag micro powder is ground by an air current mill.
The phosphogypsum is waste residue discharged during the wet-process phosphoric acid manufacture in phosphorus chemical industry.
Preferably, SO in the phosphogypsum is3The content is more than or equal to 38 percent, the content of soluble phosphorus is more than or equal to 0.05 percent and less than or equal to 0.3 percent, and the content of soluble fluorine is more than or equal to 0.005 percent and less than or equal to 0.03 percent.
Preferably, the ceramic microspheres are solid ceramic microspheres with the particle size of 1-40 um.
The quartz sand is quartz particles formed by crushing quartz stones, and the particle size of the quartz sand is less than 2.36 mm.
The crushed nickel slag sand is obtained by crushing nickel slag generated in the process of smelting ferronickel alloy from laterite-nickel ore until the particle size is less than 2.36 mm.
The water reducing rate of the retarding and water reducing agent is more than or equal to 20 percent, and the retarding time of initial setting and final setting is more than or equal to 2 hours.
Preferably, the retarding and water reducing agent is a polycarboxylic acid high-performance retarding and water reducing agent.
The reinforcing agent consists of triethanolamine borate, nitrilotriacetic acid and sodium diacetate.
Preferably, the reinforcing agent consists of sodium diacetate, triethanolamine borate and nitrilotriacetic acid in a weight ratio of 5:2: 1.
The shrinkage-reducing expansion component consists of 2-amino-2-methyl-1-propanol and magnesium oxide.
The defoaming agent is an organic silicon defoaming agent.
Preferably, the defoaming agent is hydroxypropyl polydimethylsiloxane.
The superfine steel slag micro powder can fill gaps of cement particles, increase the compactness of a hardened body, reduce system defects, reduce the water consumption of a system, and improve the strength of each age, wherein free calcium oxide has certain expansion performance; the phosphogypsum can stimulate the hydration reaction activity of the superfine steel slag micro-powder and the cement to improve the early strength, and the soluble phosphorus and the soluble fluorine in the phosphogypsum can delay the hydration reaction of the cement to play a role in retarding the coagulation; the ceramic microspheres can reduce the viscosity of the system and increase the fluidity of the grouting material; the crushed nickel slag sand has compact and smooth surface and less water absorption, can increase the flowing property of the grouting material, in addition, the nickel slag sand contains part of minerals such as tricalcium silicate, dicalcium silicate and the like, has certain reaction activity, can improve the interface structure of a cementing material and the nickel slag sand, and improves the strength of the hardened grouting material; the reinforcing agent can improve the strength of the grouting material; the defoaming agent can effectively eliminate harmful bubbles introduced during stirring of the grouting material; the xanthan gum can enable the system to have proper viscosity, reduce the phenomena of separation and bleeding which are easily generated after being mixed with water, and keep the system stable.
The invention has the advantages of
The invention determines different components and the addition amount of the different components, so that the obtained grouting material has better fluidity and strong injectability, and can permeate into tiny cracks or gaps; the setting time is long, so that the construction is ensured; has higher strength and micro-expansion performance, does not bleed and isolate, and meets the requirements of the fabricated building.
Detailed Description
The following further describes embodiments of the present invention with reference to specific examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the scope of the present invention is not limited by the examples of the present invention.
Example 1
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 30 parts of cement, 8 parts of superfine steel slag micro powder, 2 parts of phosphogypsum, 5 parts of ceramic microspheres, 30 parts of quartz sand, 30 parts of crushed nickel slag sand, 0.05 part of retarding and water reducing agent, 0.1 part of reinforcing agent, 0.5 part of shrinkage-reducing expansion component, 0.005 part of defoaming agent and 0.005 part of xanthan gum.
The cement is ordinary portland cement.
The grain size of the superfine steel slag micro powder is 3-5 um.
The phosphogypsum is waste residue discharged during the wet-process phosphoric acid manufacture in phosphorus chemical industry.
The quartz sand is quartz particles formed by crushing quartz stones, and the particle size of the quartz sand is less than 2.36 mm.
The crushed nickel slag sand is obtained by crushing nickel slag generated in the process of smelting ferronickel alloy from laterite-nickel ore until the particle size is less than 2.36 mm.
The water reducing rate of the retarding and water reducing agent is more than or equal to 20 percent, and the retarding time of initial setting and final setting is more than or equal to 2 hours.
Preferably, the retarding and water reducing agent is a polycarboxylic acid high-performance retarding and water reducing agent.
The reinforcing agent consists of triethanolamine borate, nitrilotriacetic acid and sodium diacetate.
The shrinkage-reducing expansion component consists of 2-amino-2-methyl-1-propanol and magnesium oxide.
The defoaming agent is an organic silicon defoaming agent.
Example 2
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 40 parts of cement, 3 parts of superfine steel slag micro powder, 6 parts of phosphogypsum, 3 parts of ceramic microspheres, 50 parts of quartz sand, 20 parts of crushed nickel slag sand, 0.5 part of retarding and water reducing agent, 0.05 part of reinforcing agent, 2 parts of shrinkage and expansion reducing component, 0.001 part of defoaming agent and 0.01 part of xanthan gum.
The cement is P.O 52.5 cement.
The grain size of the superfine steel slag micro powder is 3-5 um.
SO in the phosphogypsum3The content is more than or equal to 38 percent, the content of soluble phosphorus is more than or equal to 0.05 percent and less than or equal to 0.3 percent, and the content of soluble fluorine is more than or equal to 0.005 percent and less than or equal to 0.03 percent.
The quartz sand is quartz particles formed by crushing quartz stones, and the particle size of the quartz sand is less than 2.36 mm.
The crushed nickel slag sand is obtained by crushing nickel slag generated in the process of smelting ferronickel alloy from laterite-nickel ore until the particle size is less than 2.36 mm.
The water reducing rate of the retarding and water reducing agent is more than or equal to 20 percent, and the retarding time of initial setting and final setting is more than or equal to 2 hours.
The reinforcing agent consists of triethanolamine borate, nitrilotriacetic acid and sodium diacetate.
The shrinkage-reducing expansion component consists of 2-amino-2-methyl-1-propanol and magnesium oxide.
The defoaming agent is an organic silicon defoaming agent.
Example 3
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 35 parts of cement, 5 parts of superfine steel slag micro powder, 4 parts of phosphogypsum, 4 parts of ceramic microspheres, 40 parts of quartz sand, 25 parts of crushed nickel slag sand, 0.2 part of retarding and water reducing agent, 0.08 part of reinforcing agent, 1.2 parts of shrinkage and expansion reducing component, 0.003 part of defoaming agent and 0.008 part of xanthan gum.
The cement is P.O 52.5 cement.
The superfine steel slag micro powder is obtained by grinding steel slag to the particle size of 3-5um by an air current mill.
SO in the phosphogypsum3The content is more than or equal to 38 percent, the content of soluble phosphorus is more than or equal to 0.05 percent and less than or equal to 0.3 percent, and the content of soluble fluorine is more than or equal to 0.005 percent and less than or equal to 0.03 percent.
The ceramic microspheres are solid ceramic microspheres with the particle size of 1-40 um.
The quartz sand is quartz particles formed by crushing quartz stones, and the particle size of the quartz sand is less than 2.36 mm.
The crushed nickel slag sand is obtained by crushing nickel slag generated in the process of smelting ferronickel alloy from laterite-nickel ore until the particle size is less than 2.36 mm.
The retarding and water reducing agent is a polycarboxylic acid high-performance retarding and water reducing agent.
The reinforcing agent consists of sodium diacetate, triethanolamine borate and nitrilotriacetic acid according to the weight ratio of 5:2: 1.
The shrinkage-reducing expansion component consists of 2-amino-2-methyl-1-propanol and magnesium oxide.
The defoaming agent is hydroxypropyl dimethyl silicone polymer.
Example 4
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 32 parts of cement, 6 parts of superfine steel slag micro powder, 3 parts of phosphogypsum, 4.5 parts of ceramic microspheres, 35 parts of quartz sand, 28 parts of crushed nickel slag sand, 0.1 part of retarding and water reducing agent, 0.09 part of reinforcing agent, 1 part of shrinkage and expansion reducing component, 0.004 part of defoaming agent and 0.007 part of xanthan gum.
The cement is ordinary portland cement.
The grain size of the superfine steel slag micro powder is 3-5 um.
SO in the phosphogypsum3The content of 43 percent, the content of soluble phosphorus is 0.13 percent, and the content of soluble fluorine is 0.012 percent.
The ceramic microspheres are solid ceramic microspheres with the particle size of 20 um.
The quartz sand is quartz particles formed by crushing quartz stones, and the particle size of the quartz sand is less than 2.36 mm.
The crushed nickel slag sand is obtained by crushing nickel slag generated in the process of smelting ferronickel alloy from laterite-nickel ore until the particle size is less than 2.36 mm.
The retarding and water reducing agent is a polycarboxylic acid high-performance retarding and water reducing agent.
The reinforcing agent consists of triethanolamine borate, nitrilotriacetic acid and sodium diacetate.
The shrinkage-reducing expansion component consists of 2-amino-2-methyl-1-propanol and magnesium oxide.
The defoaming agent is an organic silicon defoaming agent.
Example 5
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 38 parts of cement, 4 parts of superfine steel slag micro powder, 5 parts of phosphogypsum, 3.5 parts of ceramic microspheres, 45 parts of quartz sand, 22 parts of crushed nickel slag sand, 0.4 part of retarding and water reducing agent, 0.06 part of reinforcing agent, 1.5 parts of shrinkage and expansion reducing component, 0.002 part of defoaming agent and 0.006 part of xanthan gum.
Comparative example 1
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 35 parts of cement, 4 parts of phosphogypsum, 4 parts of ceramic microspheres, 40 parts of quartz sand, 25 parts of crushed nickel slag sand, 0.2 part of retarding and water reducing agent, 0.08 part of reinforcing agent, 1.2 parts of shrinkage and expansion reducing component, 0.003 part of defoaming agent and 0.008 part of xanthan gum.
The cement is P.O 52.5 cement.
SO in the phosphogypsum3The content is more than or equal to 38 percent, the content of soluble phosphorus is more than or equal to 0.05 percent and less than or equal to 0.3 percent, and the content of soluble fluorine is more than or equal to 0.005 percent and less than or equal to 0.03 percent.
The ceramic microspheres are solid ceramic microspheres with the particle size of 1-40 um.
The quartz sand is quartz particles formed by crushing quartz stones, and the particle size of the quartz sand is less than 2.36 mm.
The crushed nickel slag sand is obtained by crushing nickel slag generated in the process of smelting ferronickel alloy from laterite-nickel ore until the particle size is less than 2.36 mm.
The retarding and water reducing agent is a polycarboxylic acid high-performance retarding and water reducing agent.
The reinforcing agent consists of sodium diacetate, triethanolamine borate and nitrilotriacetic acid according to the weight ratio of 5:2: 1.
The shrinkage-reducing expansion component consists of 2-amino-2-methyl-1-propanol and magnesium oxide.
The defoaming agent is hydroxypropyl dimethyl silicone polymer.
Comparative example 2
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 35 parts of cement, 5 parts of superfine steel slag micro powder, 4 parts of ceramic micro-beads, 40 parts of quartz sand, 25 parts of broken nickel slag sand, 0.2 part of a retarding and water reducing agent, 0.08 part of a reinforcing agent, 1.2 parts of a shrinkage reducing and expanding component, 0.003 part of a defoaming agent and 0.008 part of xanthan gum.
The cement is P.O 52.5 cement.
The superfine steel slag micro powder is obtained by grinding steel slag to the particle size of 3-5um by an air current mill.
The ceramic microspheres are solid ceramic microspheres with the particle size of 1-40 um.
The quartz sand is quartz particles formed by crushing quartz stones, and the particle size of the quartz sand is less than 2.36 mm.
The crushed nickel slag sand is obtained by crushing nickel slag generated in the process of smelting ferronickel alloy from laterite-nickel ore until the particle size is less than 2.36 mm.
The retarding and water reducing agent is a polycarboxylic acid high-performance retarding and water reducing agent.
The reinforcing agent consists of sodium diacetate, triethanolamine borate and nitrilotriacetic acid according to the weight ratio of 5:2: 1.
The shrinkage-reducing expansion component consists of 2-amino-2-methyl-1-propanol and magnesium oxide.
The defoaming agent is hydroxypropyl dimethyl silicone polymer.
Comparative example 3
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 35 parts of cement, 5 parts of superfine steel slag micro powder, 4 parts of phosphogypsum, 40 parts of quartz sand, 25 parts of crushed nickel slag sand, 0.2 part of retarding and water reducing agent, 0.08 part of reinforcing agent, 1.2 parts of shrinkage and expansion reducing component, 0.003 part of defoaming agent and 0.008 part of xanthan gum.
The cement is P.O 52.5 cement.
The superfine steel slag micro powder is obtained by grinding steel slag to the particle size of 3-5um by an air current mill.
SO in the phosphogypsum3The content is more than or equal to 38 percent, the content of soluble phosphorus is more than or equal to 0.05 percent and less than or equal to 0.3 percent, and the content of soluble fluorine is more than or equal to 0.005 percent and less than or equal to 0.03 percent.
The quartz sand is quartz particles formed by crushing quartz stones, and the particle size of the quartz sand is less than 2.36 mm.
The crushed nickel slag sand is obtained by crushing nickel slag generated in the process of smelting ferronickel alloy from laterite-nickel ore until the particle size is less than 2.36 mm.
The retarding and water reducing agent is a polycarboxylic acid high-performance retarding and water reducing agent.
The reinforcing agent consists of sodium diacetate, triethanolamine borate and nitrilotriacetic acid according to the weight ratio of 5:2: 1.
The shrinkage-reducing expansion component consists of 2-amino-2-methyl-1-propanol and magnesium oxide.
The defoaming agent is hydroxypropyl dimethyl silicone polymer.
Comparative example 4
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 35 parts of cement, 5 parts of superfine steel slag micro powder, 4 parts of phosphogypsum, 4 parts of ceramic microspheres, 40 parts of quartz sand, 25 parts of crushed nickel slag sand, 0.2 part of retarding and water reducing agent, 1.2 parts of shrinkage and expansion reducing component, 0.003 part of defoaming agent and 0.008 part of xanthan gum.
The cement is P.O 52.5 cement.
The superfine steel slag micro powder is obtained by grinding steel slag to the particle size of 3-5um by an air current mill.
SO in the phosphogypsum3The content is more than or equal to 38 percent, the content of soluble phosphorus is more than or equal to 0.05 percent and less than or equal to 0.3 percent, and the content of soluble fluorine is more than or equal to 0.005 percent and less than or equal to 0.03 percent.
The ceramic microspheres are solid ceramic microspheres with the particle size of 1-40 um.
The quartz sand is quartz particles formed by crushing quartz stones, and the particle size of the quartz sand is less than 2.36 mm.
The crushed nickel slag sand is obtained by crushing nickel slag generated in the process of smelting ferronickel alloy from laterite-nickel ore until the particle size is less than 2.36 mm.
The retarding and water reducing agent is a polycarboxylic acid high-performance retarding and water reducing agent.
The shrinkage-reducing expansion component consists of 2-amino-2-methyl-1-propanol and magnesium oxide.
The defoaming agent is hydroxypropyl dimethyl silicone polymer.
Comparative example 5
The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 35 parts of cement, 5 parts of superfine steel slag micro powder, 4 parts of phosphogypsum, 4 parts of ceramic microspheres, 40 parts of quartz sand, 25 parts of crushed nickel slag sand, 0.2 part of retarding and water reducing agent, 0.08 part of reinforcing agent, 0.003 part of defoaming agent and 0.008 part of xanthan gum.
The cement is P.O 52.5 cement.
The superfine steel slag micro powder is obtained by grinding steel slag to the particle size of 3-5um by an air current mill.
SO in the phosphogypsum3The content is more than or equal to 38 percent, the content of soluble phosphorus is more than or equal to 0.05 percent and less than or equal to 0.3 percent, and the content of soluble fluorine is more than or equal to 0.005 percent and less than or equal to 0.03 percent.
The ceramic microspheres are solid ceramic microspheres with the particle size of 1-40 um.
The quartz sand is quartz particles formed by crushing quartz stones, and the particle size of the quartz sand is less than 2.36 mm.
The crushed nickel slag sand is obtained by crushing nickel slag generated in the process of smelting ferronickel alloy from laterite-nickel ore until the particle size is less than 2.36 mm.
The retarding and water reducing agent is a polycarboxylic acid high-performance retarding and water reducing agent.
The reinforcing agent consists of sodium diacetate, triethanolamine borate and nitrilotriacetic acid according to the weight ratio of 5:2: 1.
The defoaming agent is hydroxypropyl dimethyl silicone polymer.
Performance testing
The performance parameters of the prefabricated building sleeve grouting materials obtained in examples 1 to 5 and comparative examples 1 to 5 were tested by referring to JG/T408-2013 sleeve grouting material for reinforcing bar connection, and the results are shown in table 1 below.
Table 1 results of performance testing
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and modifications made according to the technical solutions described in the embodiments, and equivalents, improvements, etc. made to some technical features thereof should be included in the scope of the present invention.
Claims (7)
1. The assembly type building sleeve grouting material is composed of the following raw materials in parts by weight: 30-40 parts of cement, 3-8 parts of superfine steel slag micro powder, 2-6 parts of phosphogypsum, 3-5 parts of ceramic microspheres, 30-50 parts of quartz sand, 20-30 parts of crushed nickel slag sand, 0.05-0.5 part of retarding and water reducing agent, 0.05-0.1 part of reinforcing agent, 0.5-2 parts of shrinkage reducing and expansion component, 0.001-0.005 part of defoaming agent and 0.005-0.01 part of xanthan gum; the shrinkage-reducing expansion component consists of 2-amino-2-methyl-1-propanol and magnesium oxide; the content of SO3 in the phosphogypsum is more than or equal to 38 percent, the content of soluble phosphorus is more than or equal to 0.05 percent and less than or equal to 0.3 percent, and the content of soluble fluorine is more than or equal to 0.005 percent and less than or equal to 0.03 percent; the ceramic microspheres are solid microspheres with the particle size of 1-40 um; the reinforcing agent consists of triethanolamine borate, nitrilotriacetic acid and sodium diacetate.
2. The assembly type building sleeve grouting material of claim 1, wherein the superfine steel slag micropowder has a particle size of 3-5 um.
3. The prefabricated building sleeve grout of claim 1, wherein said ceramic microbeads are solid ceramic microbeads having a particle size of 1-40 um.
4. The fabricated building sleeve grouting material according to claim 1, wherein the crushed nickel slag sand is obtained by crushing nickel slag generated in a process of smelting ferronickel from laterite-nickel ore to a particle size of less than 2.36 mm.
5. The prefabricated building sleeve grouting material as claimed in claim 1, wherein the water reducing rate of the retarding and water reducing agent is greater than or equal to 20%, and the retarding time of initial setting and final setting is greater than or equal to 2 h.
6. The prefabricated building sleeve grout of claim 1, wherein said reinforcing agent is comprised of sodium diacetate, triethanolamine borate and nitrilotriacetic acid in a weight ratio of 5:2: 1.
7. The fabricated building sleeve grout of claim 1, wherein said defoamer is a silicone defoamer.
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