CN112341124A - Light grouting material for repairing hollowing of wall heat insulation system and preparation method thereof - Google Patents
Light grouting material for repairing hollowing of wall heat insulation system and preparation method thereof Download PDFInfo
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- CN112341124A CN112341124A CN202011117204.5A CN202011117204A CN112341124A CN 112341124 A CN112341124 A CN 112341124A CN 202011117204 A CN202011117204 A CN 202011117204A CN 112341124 A CN112341124 A CN 112341124A
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/16—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 calcium sulfate cements containing anhydrite, e.g. Keene's cement
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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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
- 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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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of building materials, and provides a light grouting material for repairing a wall heat-insulating system hollowing and a preparation method thereof. The light grouting material is simple to prepare and convenient to use, has the advantages of easy pouring, good hollowing repairing effect, controllable setting time and operable time, small volume density, no segregation and layering, quick development of early strength, high bonding strength with a base body, no shrinkage cracking problem and the like, and is suitable for hollowing repairing projects of various external and internal wall heat-insulating systems and other grouting repairing projects with low requirements on compressive strength and high requirements on bonding performance.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a light grouting material for repairing a wall heat-insulating system by hollowing and a preparation method thereof.
Background
Since 2000 years, the external wall heat insulation system is widely applied to the external wall of a building, and has good heat insulation and energy saving effects. However, in recent years, due to the influence of factors such as environmental conditions, product quality, construction technology and the like, phenomena of hollowing, cracking and even falling of an external wall heat insulation system occur, the heat insulation and energy saving effects of the wall are seriously influenced, and the life safety of people is threatened. The maintenance and repair of external thermal insulation systems of walls has been increasingly appreciated.
In the service process of the external thermal insulation system of the wall, firstly, the problem which easily occurs is hollowing, and if the external thermal insulation system can not be repaired in time, the external thermal insulation system is easy to gradually deteriorate until cracking or even falling off. Therefore, the method is very important for repairing the hollowing of the external thermal insulation system of the wall in time. At present, the hollowing repair is mainly carried out by adopting a grouting method, and common materials are chemical grouting materials and common cement-based grouting materials. The chemical grouting material has the problems of poor durability and poor water resistance, and is easy to flow, so that the material is seriously wasted and the expected repairing effect cannot be achieved. The common cement-based grouting material has the problems of high density, large unit volume weight, more materials, high early expansion rate, easy shrinkage and cracking in the later period and the like, and has the defects of over-high strength, poor matching property with a heat insulation system, poor bonding property with a heat insulation material and the like.
Disclosure of Invention
The invention aims to solve the problems and provides a light grouting material for repairing a wall heat-insulating system by hollowing and a preparation method thereof.
The invention provides a light grouting material for repairing a wall heat insulation system by hollowing, which is characterized by comprising the following components in parts by weight: 100 parts of ternary cementing material, 10-30 parts of auxiliary cementing material, 5-15 parts of latex powder, 0.02-0.10 part of cellulose ether, 0.15-0.55 part of water reducing agent, 0.1-0.35 part of air entraining agent, 0.1-0.5 part of defoaming agent, 0.3-1.0 part of water repellent, 0.02-0.08 part of expanding agent, 1-6 parts of light aggregate and 130-260 parts of quartz sand, wherein the ternary cementing material is prepared by mixing portland cement, sulphoaluminate cement and gypsum according to a mass ratio of 85:10:5, and the auxiliary cementing material is a mixture of titanium slag micro powder and fly ash.
The light grouting material for repairing the wall heat insulation system by the hollowing can also have the following characteristics: wherein the mass ratio of the titanium slag micro powder to the fly ash is 1: 1.
The light grouting material for repairing the wall heat insulation system by the hollowing can also have the following characteristics: wherein the titanium slag micro powder has an activity index of more than or equal to 95 and a specific surface area of 400-450m2Per kg of ground titanium slag powder, wherein the fly ash is II-grade fly ash.
The light grouting material for repairing the wall heat insulation system by the hollowing can also have the following characteristics: wherein the gypsum is formed by mixing phosphogypsum and anhydrite according to the mass ratio of 1: 1.
The light grouting material for repairing the wall heat insulation system by the hollowing can also have the following characteristics: wherein the phosphogypsum is dihydrate phosphogypsum with the particle size of less than or equal to 80 mu m, and the anhydrite is natural anhydrite with the particle size of less than or equal to 80 mu m.
The light grouting material for repairing the wall heat insulation system by the hollowing can also have the following characteristics: wherein the lightweight aggregate is expanded perlite with volume water absorption rate of less than or equal to 20 percent, surface vitrification closed pore rate of more than or equal to 90 percent, particle size of less than or equal to 0.3mm, and particle size of quartz sand of less than or equal to 0.3 mm.
The light grouting material for repairing the wall heat insulation system by the hollowing can also have the following characteristics: wherein the cellulose ether is hydroxyethyl cellulose with the viscosity of 1500mPa.s-2500 mPa.s.
The light grouting material for repairing the wall heat insulation system by the hollowing can also have the following characteristics: wherein the latex powder is a chloroethylene-vinyl laurate-ethylene terpolymer with the lowest film forming temperature of 0 ℃.
The light grouting material for repairing the wall heat insulation system by the hollowing can also have the following characteristics: the water reducing agent is a powdery polycarboxylic acid water reducing agent, the air entraining agent is a powdery lauric acid sodium sulfate air entraining agent, the defoaming agent is a powdery nonionic linear polymethyl siloxane defoaming agent, the water repellent is a powdery polysiloxane water repellent, and the expanding agent is a powdery ADC expanding agent.
The invention also provides a preparation method of the light grouting material for repairing the hollowing of the wall heat insulation system, which is characterized by comprising the following steps: step 1, weighing various raw materials according to weight proportion; step 2, adding the weighed ternary cementing material and auxiliary cementing material into a mixer for mixing; step 3, adding the weighed latex powder, cellulose ether, water reducing agent, air entraining agent, defoaming agent, water repellent and expanding agent into a mixer together for mixing; and 4, finally, adding the weighed lightweight aggregate and quartz sand into a mixer for mixing to prepare the lightweight grouting material for repairing the hollowing of the wall heat insulation system.
Action and Effect of the invention
According to the light grouting material for repairing the hollowing of the wall heat-insulating system, provided by the invention, a ternary cementing material system is formed by the Portland cement, the sulphoaluminate cement and the gypsum, the proportional relation among the Portland cement, the sulphoaluminate cement and the gypsum is strictly defined on the basis of the hydration characteristics and the performance requirements of the light grouting material, and each component has an advantage complementary effect. Wherein the Portland cement endows the light grouting material with certain early strength and ensures the later strength; the sulphoaluminate cement improves the early strength and the volume stability; the gypsum mainly provides sulfate ions in different ages of hydration, and reacts with sulphoaluminate cement to continuously generate ettringite, so that the volume stability of the grouting material in different ages is ensured, and the gypsum undergoes hydration reaction with the auxiliary cementing material, and the strength and the volume stability of the grouting material in the middle and later periods are further improved.
The auxiliary cementing material has the effect of optimizing the middle and later-period performance of the light grouting material. Wherein the titanium slag micro powder has high potential gelling activityThe hydration product Ca (OH) formed with portland cement2Sulfate ions released by the gypsum react to generate hydration reaction to generate hydrated calcium silicate gel and ettringite, so that the compactness is enhanced, and the strength and the volume stability are improved; the water retention and viscosity of the freshly mixed grouting material are improved to a certain extent due to the high specific surface area; the fly ash reacts with calcium hydroxide at the middle and later stages to generate calcium silicate hydrate gel, the strength is improved, and the fly ash contains more hollow vitrified micro-beads, so that the ball lubricating effect is achieved, the density of the grouting material can be reduced to a certain extent, and the fluidity of the grouting material is improved.
In addition, the latex powder endows the light grouting material with excellent bonding performance and water resistance, and improves the flexibility and the cracking resistance. The cellulose ether with a proper viscosity range ensures that the light grouting material has good water-retaining property and excellent working property, solves the phenomena of bleeding and segregation, has a certain air entraining effect, and reduces the volume density. The water reducing agent enables the light grouting material to have excellent fluidity, and meanwhile, the water consumption is obviously reduced, and the compactness and the strength are improved. The air entraining agent introduces proper bubbles, so that the workability is improved, the pore structure is optimized, and the volume density is reduced. The defoaming agent reduces larger bubbles in the light grouting material, optimizes the pore structure and improves the volume stability. The water repellent gives the light grouting material good water resistance and waterproofness, thereby improving the water-resistant bonding performance and the external water and ion invasion capacity. The expanding agent endows the light grouting material with good plastic expansion characteristic in the early age and has good volume stability in the middle and later periods.
In addition, the lightweight aggregate and the quartz sand constitute the aggregate. The lightweight aggregate can obviously reduce the volume density of the lightweight grouting material, simultaneously avoid generating larger adverse effects on fluidity and strength, and avoid the problem of segregation and delamination to the maximum extent. The quartz sand enables the light grouting material to have good workability, strength and volume stability.
The components cooperate and coordinate in the ratio range recorded in the invention, so that the product of the invention has good working performance, bonding performance and volume stability and proper volume density and strength, the key technical problems of large volume density, poor volume stability, overhigh strength, poor matching with a heat insulation system, poor bonding performance and the like of the conventional heat insulation system hollow-drum repairing material are really solved, and the light grouting material for repairing the wall heat insulation system hollow-drum, which has good working performance, a hollow-drum repairing and compacting effect, proper volume density and strength, excellent bonding force and good volume stability, is prepared.
Therefore, the product of the invention has excellent performance, uniform and stable quality, simple production process and convenient use, and ensures the quality of the wall heat-insulating system hollowing repair project; in addition, a large amount of industrial solid wastes such as titanium slag, fly ash, phosphogypsum and the like are applied, so that the economic cost is low, and the social benefit, the environmental benefit and the economic benefit are high. Meanwhile, the product has wide application range, is suitable for hollowing repair engineering of various wall external insulation systems with insulation materials such as polystyrene boards, rock wool boards, insulation mortar, inorganic insulation boards, polyurethane and the like, is also suitable for hollowing repair engineering of wall internal insulation systems, and other grouting repair engineering with low requirement on compressive strength but high requirement on bonding performance, and can be popularized and applied in a large scale.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the light grouting material for repairing the wall insulation system by hollowing and the preparation method thereof are specifically described in the following embodiments.
The light grouting material for repairing the wall heat insulation system by the hollowing comprises the following components in parts by weight: 100 parts of ternary cementing material, 10-30 parts of auxiliary cementing material, 5-15 parts of latex powder, 0.02-0.10 part of cellulose ether, 0.15-0.55 part of water reducing agent, 0.1-0.35 part of air entraining agent, 0.1-0.5 part of defoaming agent, 0.3-1.0 part of water repellent, 0.02-0.08 part of expanding agent, 1-6 parts of light aggregate and 130-260 parts of quartz sand.
The preferable mass ratio is as follows: 100 parts of ternary cementing material, 15-25 parts of auxiliary cementing material, 7.5-12.5 parts of latex powder, 0.03-0.06 part of cellulose ether, 0.25-0.45 part of water reducing agent, 0.15-0.25 part of air entraining agent, 0.2-0.4 part of defoaming agent, 0.4-0.8 part of water repellent, 0.03-0.06 part of expanding agent, 2-4 parts of light aggregate and 150-220 parts of quartz sand.
Wherein the ternary cementing material is prepared by mixing portland cement, sulphoaluminate cement and gypsum according to the mass ratio of 85:10: 5; the auxiliary cementing material is formed by mixing titanium slag micro powder and fly ash according to the mass ratio of 1: 1. The titanium slag micro powder has an activity index of more than or equal to 95 and a specific surface area of 400-450m2Per kg of ground titanium slag powder, wherein the fly ash is II-grade fly ash.
The gypsum is formed by mixing phosphogypsum and anhydrite according to the mass ratio of 1:1, the phosphogypsum is dihydrate phosphogypsum with the particle size of less than or equal to 80 mu m after being dried at the low temperature of 50-60 ℃, and the anhydrite is natural anhydrite with the particle size of less than or equal to 80 mu m.
The light aggregate is expanded perlite with volume water absorption rate less than or equal to 20%, surface vitrification closed pore rate more than or equal to 90%, surface vitrification of particle size less than or equal to 0.3mm, and particle size of quartz sand less than or equal to 0.3 mm.
The cellulose ether is hydroxyethyl cellulose with viscosity of 1500-2500 mPa.s. The latex powder is a chloroethylene-vinyl laurate-ethylene terpolymer with the lowest film forming temperature of 0 ℃.
The water reducing agent is a powdery polycarboxylic acid water reducing agent, the air entraining agent is a powdery lauric acid sodium sulfate air entraining agent, the defoaming agent is a powdery nonionic linear polymethylsiloxane defoaming agent, the water repellent is a powdery polysiloxane water repellent, and the expanding agent is a powdery ADC (azodicarbonamide) expanding agent.
Except titanium slag micro powder, the raw materials are purchased through common commercial approaches, and the specific models and manufacturers or CAS numbers or reference standards are as follows:
portland cement, available from Ningguo cement works, England Spiro cement Limited, model number PII42.5R or PII52.5R.
Sulphoaluminate cement, which is purchased from Nippon bear building materials Co., Ltd, and is 42.5 grade quick-hardening sulphoaluminate cement;
phosphogypsum is first-grade phosphogypsum which is from Yihua group Limited company in Hubei and meets the specification of national standard GB/T23456-2018;
the anhydrite is purchased from the Limited liability company of nonmetal material science and technology of Hengtai of Anhui, and meets the first-grade anhydrite specified in the national standard GB/T5483-2008;
the fly ash is II-grade fly ash which is from Shanghai Baotian novel building materials Co., Ltd and meets the specification of national standard GB/T1596-2017;
vinyl chloride-vinyl laurate-ethylene terpolymer available from wacker chemical (china) ltd under model number Vinnapas 8031H;
cellulose ether, available from ashlar (china) investment limited, model number Natrosol 250 HBR;
the polycarboxylate superplasticizer is purchased from Jiangsu Subo New materials GmbH, and has the model of PCA-400P;
an air entraining agent, available from Shanghai south trade, Inc., model number Silipon RN 6068;
the defoaming agent is purchased from Tiande New Material Co., Ltd, Zhoushan, and has the model number DJ-298;
the polysiloxane water repellent is purchased from Shanghai Nanjing trade company Limited and has the model number of
BS Powder A；
ADC swelling agent, purchased from Shanghai Sanrui high molecular materials GmbH, model REGAL-300;
the lightweight aggregate is purchased from Shanghai Compound Dan Anjiaxin functional materials Co., Ltd, and other properties except the above properties also meet the regulations of national industry standard JC/T1042;
the quartz sand is purchased from Yingwu quartz sand Co., Fengyang county, and the performance of the quartz sand meets the GB/T14684 regulation.
The titanium slag micro powder is from Pan Steel group Limited company, and comprises the following main chemical components: CaO 30.5%, MgO 8.5%, Al2O3 15.5％、SiO2 30.5％、TiO29.0 percent of Cl, 1.5 percent of fine ground titanium slag powder with the activity index of more than or equal to 95 and the specific surface area of 400-450m 2/kg.
The preparation method of the light grouting material comprises the following steps:
step 1, weighing various raw materials according to weight proportion;
step 2, adding the weighed ternary cementing material and auxiliary cementing material into a coulter type mixer to mix for 1-2 min;
step 3, adding the weighed latex powder, cellulose ether, water reducing agent, air entraining agent, defoaming agent, water repellent and expanding agent into a coulter mixer together, and mixing for 2-3 min;
and 4, finally, adding the weighed lightweight aggregate and quartz sand into a coulter type mixer to mix for 60-90 s, and preparing the lightweight grouting material for repairing the hollowing of the wall heat insulation system.
When in use, water is added into the light grouting material, the water addition amount is 18-21% of the total weight of the light grouting material, and the concrete steps are as follows: and pouring the weighed light grouting material into a forced stirrer, slowly adding the required water amount while stirring at a constant speed, stirring for more than 3min, and uniformly stirring for construction.
In the following examples, one portion weighed 10 kg.
< example 1>
A light grouting material for repairing a wall insulation system hollowing is prepared by the weight ratio of a ternary cementing material 100, an auxiliary cementing material 15, latex powder 8, cellulose ether 0.03, a water reducing agent 0.3, an air entraining agent 0.15, a defoaming agent 0.2, a water repellent 0.6, an expanding agent 0.04, a light aggregate 3 and quartz sand 138.
Firstly, adding the weighed ternary cementing material and the auxiliary cementing material into a coulter type mixer to mix for 1 min; then adding the weighed latex powder, cellulose ether, water reducing agent, air entraining agent, defoaming agent, water repellent and expanding agent into the coulter type mixer together to mix for 2 min; and finally, adding the weighed lightweight aggregate and quartz sand into the coulter type mixer to mix for 60s, and preparing the lightweight grouting material for repairing the hollowing of the wall thermal insulation system.
Adding water according to 19 percent of the total weight of the light grouting material, and stirring for 3min according to the using method until the slurry is uniform to obtain the slurry for construction. The slurry was subjected to a performance test, and the test results are shown in table 1.
< example 2>
A light grouting material for repairing hollowing of a wall heat insulation system is prepared by the weight ratio of a ternary cementing material 100, an auxiliary cementing material 20, latex powder 10, cellulose ether 0.04, a water reducing agent 0.3, an air entraining agent 0.2, a defoaming agent 0.3, a water repellent 0.5, an expanding agent 0.03, a lightweight aggregate 4 and quartz sand 180.
Firstly, adding the weighed ternary cementing material and the auxiliary cementing material into a coulter type mixer to mix for 1 min; then adding the weighed latex powder, cellulose ether, water reducing agent, air entraining agent, defoaming agent, water repellent and expanding agent into the coulter type mixer together to mix for 2 min; and finally, adding the weighed lightweight aggregate and quartz sand into the coulter type mixer to mix for 75s, and preparing the lightweight grouting material for repairing the hollowing of the wall thermal insulation system.
Adding water according to 18 percent of the total weight of the light grouting material, and stirring for 3.5min according to the using method until the slurry is in a uniform state to obtain the slurry for construction. The slurry was subjected to a performance test, and the test results are shown in table 1.
< example 3>
The light grouting material for repairing the hollowing of the wall heat-insulating system is prepared from a ternary cementing material 100, an auxiliary cementing material 25, latex powder 12, cellulose ether 0.05, a water reducing agent 0.4, an air entraining agent 0.23, a defoaming agent 0.4, a water repellent 0.8, an expanding agent 0.055, a light aggregate 4.5 and quartz sand 200 in percentage by weight. Firstly, adding the weighed ternary cementing material and the auxiliary cementing material into a coulter type mixer to mix for 1-1.5 min; then adding the weighed latex powder, cellulose ether, water reducing agent, air entraining agent, defoaming agent, water repellent and expanding agent into the coulter type mixer together to mix for 2 min; and finally, adding the weighed lightweight aggregate and quartz sand into the coulter type mixer to mix for 70s, and preparing the lightweight grouting material for repairing the hollowing of the wall thermal insulation system.
Adding water according to 21 percent of the total weight of the light grouting material, and stirring for 3min according to the using method until the slurry is uniform to obtain the slurry for construction. The slurry was subjected to a performance test, and the test results are shown in table 1.
TABLE 1 Performance test results of light grouting material for hollowing repair of wall insulation system
As can be seen from Table 1, the lightweight grouting material for repairing the wall insulation system by hollowing prepared by the embodiment of the invention has excellent performance indexes, and all the performance indexes exceed relevant standards and engineering requirements such as Shanghai City external wall insulation system maintenance technical rules. The invention has the characteristics of excellent fluidity continuity (the fluidity is still more than or equal to 300mm in 30 min), high bonding strength (the bonding strength with cement mortar is more than 1.0MPa, the bonding strength with a heat-insulating material is more than or equal to 0.14MPa), early micro-expansion (the expansion rate is 0.036-0.072%), later low shrinkage (the drying shrinkage rate of 28d is less than or equal to 0.022%) and the like, has wide application range, can be used for the hollowing repair engineering of various external wall heat-insulating systems with heat-insulating materials of polystyrene boards, rock wool boards, heat-insulating mortar, inorganic heat-insulating boards, polyurethane and the like, is also suitable for the hollowing repair engineering of the internal wall heat-insulating systems, and other grouting repair engineering with low requirement on compressive strength but high requirement on bonding performance, and can be popularized and.
Effects and effects of the embodiments
According to the light grouting material for repairing the wall heat-insulating system hollowing provided by the embodiment of the invention, the Portland cement, the sulphoaluminate cement and the gypsum form a ternary cementing material system, the proportional relation among the Portland cement, the sulphoaluminate cement and the gypsum is strictly limited based on the hydration characteristics and the performance requirements of the light grouting material, and the components play a complementary role in advantages. Wherein the Portland cement endows the light grouting material with certain early strength and ensures the later strength; the sulphoaluminate cement improves the early strength and the volume stability; the gypsum mainly provides sulfate ions in different ages of hydration, and reacts with sulphoaluminate cement to continuously generate ettringite, so that the volume stability of the grouting material in different ages is ensured, and the gypsum undergoes hydration reaction with the auxiliary cementing material, and the strength and the volume stability of the grouting material in the middle and later periods are further improved.
The auxiliary cementing material has the effect of optimizing the middle and later-period performance of the light grouting material. Wherein the titanium slag micro powder has high potential gelling activity and generates a hydration product Ca (OH) with Portland cement2Sulfate ions released by the gypsum react to generate hydration reaction to generate hydrated calcium silicate gel and ettringite, so that the compactness is enhanced, and the strength and the volume stability are improved; the water retention and viscosity of the freshly mixed grouting material are improved to a certain extent due to the high specific surface area; the fly ash reacts with calcium hydroxide at the middle and later stages to generate calcium silicate hydrate gel, the strength is improved, and the fly ash contains more hollow vitrified micro-beads, so that the ball lubricating effect is achieved, the density of the grouting material can be reduced to a certain extent, and the fluidity of the grouting material is improved.
In addition, the chloroethylene-vinyl laurate-ethylene terpolymer emulsion powder with the lowest film forming temperature of 0 ℃ ensures that a polymer can be formed into a film under the condition of low temperature, so that the light grouting material is endowed with excellent bonding performance, and meanwhile, the flexibility and the cracking resistance are obviously improved. The cellulose ether with a proper viscosity range ensures that the light grouting material has good water-retaining property and excellent working property, solves the phenomena of bleeding and segregation, has a certain air entraining effect, and reduces the volume density. The polycarboxylate superplasticizer has ultrahigh water reducing effect and adaptability, so that the light grouting material has excellent fluidity, the water consumption is obviously reduced, and the compactness and the strength are improved. The air entraining agent introduces proper bubbles, so that the workability is improved, the pore structure is optimized, and the volume density is reduced. The defoaming agent reduces larger bubbles in the light grouting material, optimizes the pore structure and improves the volume stability. The polysiloxane water repellent endows the light grouting material with good water resistance and waterproofness, thereby improving the water-resistant bonding performance and the external water and ion invasion capacity, and the light grouting material has excellent weather resistance and can continuously play the functions in the service process. The ADC expanding agent can introduce fine and stable bubbles, endows the light grouting material with good plastic expansion characteristic in the early age, and has good volume stability in the middle and later periods.
In addition, the lightweight aggregate and the quartz sand constitute the aggregate. The lightweight aggregate expanded perlite optimized through systematic research can obviously reduce the volume density of the lightweight grouting material, simultaneously avoid generating larger adverse effects on fluidity and strength, and avoid the problem of segregation and delamination to the maximum extent. The quartz sand enables the light grouting material to have good workability, strength and volume stability.
The components cooperate and coordinate in the ratio range recorded in the invention, so that the product of the invention has good working performance, bonding performance and volume stability and proper volume density and strength, the key technical problems of large volume density, poor volume stability, overhigh strength, poor matching with a heat insulation system, poor bonding performance and the like of the conventional heat insulation system hollow-drum repairing material are really solved, and the light grouting material for repairing the wall heat insulation system hollow-drum, which has good working performance, a hollow-drum repairing and compacting effect, proper volume density and strength, excellent bonding force and good volume stability, is prepared.
Therefore, the product of the invention has excellent performance, uniform and stable quality, simple production process and convenient use, and ensures the quality of the wall heat-insulating system hollowing repair project; in addition, a large amount of industrial solid wastes such as titanium slag, fly ash, phosphogypsum and the like are applied, so that the economic cost is low, and the social benefit, the environmental benefit and the economic benefit are high. Meanwhile, the product has wide application range, is suitable for hollowing repair engineering of various wall external insulation systems with insulation materials such as polystyrene boards, rock wool boards, insulation mortar, inorganic insulation boards, polyurethane and the like, is also suitable for hollowing repair engineering of wall internal insulation systems, and other grouting repair engineering with low requirement on compressive strength but high requirement on bonding performance, and can be popularized and applied in a large scale.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (10)
1. The lightweight grouting material for repairing the wall insulation system by hollowing is characterized by comprising the following components in parts by weight:
100 parts of ternary cementing material, 10-30 parts of auxiliary cementing material, 5-15 parts of latex powder, 0.02-0.10 part of cellulose ether, 0.15-0.55 part of water reducing agent, 0.1-0.35 part of air entraining agent, 0.1-0.5 part of defoaming agent, 0.3-1.0 part of water repellent, 0.02-0.08 part of expanding agent, 1-6 parts of light aggregate and 130-260 parts of quartz sand,
the ternary cementing material is formed by mixing portland cement, sulphoaluminate cement and gypsum according to a mass ratio of 85:10:5, and the auxiliary cementing material is a mixture of titanium slag micro powder and fly ash.
2. The light grouting material for repairing the wall thermal insulation system by hollowing according to claim 1, which is characterized in that:
wherein the mass ratio of the titanium slag micro powder to the fly ash is 1: 1.
3. The light grouting material for repairing the wall thermal insulation system by hollowing according to claim 2, which is characterized in that:
wherein the titanium slag micro powder has an activity index of more than or equal to 95 and a specific surface area of 400-450m2And/kg of ground titanium slag powder, wherein the fly ash is II-grade fly ash.
4. The light grouting material for repairing the wall thermal insulation system by hollowing according to claim 1, which is characterized in that:
wherein the gypsum is formed by mixing phosphogypsum and anhydrite according to the mass ratio of 1: 1.
5. The light grouting material for repairing the wall thermal insulation system by hollowing according to claim 4, which is characterized in that:
the phosphogypsum is dihydrate phosphogypsum with the particle size of less than or equal to 80 mu m, and the anhydrite is natural anhydrite with the particle size of less than or equal to 80 mu m.
6. The light grouting material for repairing the wall thermal insulation system by hollowing according to claim 1, which is characterized in that:
wherein the lightweight aggregate is expanded perlite with volume water absorption rate of less than or equal to 20%, surface vitrification closed pore rate of more than or equal to 90%, particle size of less than or equal to 0.3mm, and particle size of quartz sand is less than or equal to 0.3 mm.
7. The light grouting material for repairing the wall thermal insulation system by hollowing according to claim 1, which is characterized in that:
wherein the cellulose ether is hydroxyethyl cellulose with the viscosity of 1500mPa.s-2500 mPa.s.
8. The light grouting material for repairing the wall thermal insulation system by hollowing according to claim 1, which is characterized in that:
wherein the latex powder is a chloroethylene-vinyl laurate-ethylene terpolymer with the lowest film forming temperature of 0 ℃.
9. The light grouting material for repairing the wall thermal insulation system by hollowing according to claim 1, which is characterized in that:
the water reducing agent is a powdery polycarboxylic acid water reducing agent, the air entraining agent is a powdery lauric acid sodium sulfate air entraining agent, the defoaming agent is a powdery nonionic linear polymethyl siloxane defoaming agent, the water repellent is a powdery polysiloxane water repellent, and the expanding agent is a powdery ADC expanding agent.
10. A preparation method of a light grouting material for repairing a wall heat insulation system by hollowing is characterized by comprising the following steps:
step 1, weighing various raw materials according to weight proportion;
step 2, adding the weighed ternary cementing material and auxiliary cementing material into a mixer for mixing;
step 3, adding the weighed latex powder, cellulose ether, water reducing agent, air entraining agent, defoaming agent, water repellent and expanding agent into the mixer together for mixing;
step 4, finally adding the weighed lightweight aggregate and quartz sand into the mixer for mixing to prepare the lightweight grouting material for repairing the hollowing of the wall heat-insulating system,
wherein the light grouting material for repairing the wall thermal insulation system by hollowing is the light grouting material for repairing the wall thermal insulation system by hollowing according to any one of claims 1 to 9.
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