CN111747705A - Preparation method and application of special bonding mortar material for foam glass external thermal insulation system - Google Patents
Preparation method and application of special bonding mortar material for foam glass external thermal insulation system Download PDFInfo
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- CN111747705A CN111747705A CN202010536191.9A CN202010536191A CN111747705A CN 111747705 A CN111747705 A CN 111747705A CN 202010536191 A CN202010536191 A CN 202010536191A CN 111747705 A CN111747705 A CN 111747705A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 154
- 239000011494 foam glass Substances 0.000 title claims abstract description 66
- 239000000463 material Substances 0.000 title claims abstract description 43
- 238000009413 insulation Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 27
- -1 polypropylene Polymers 0.000 claims abstract description 25
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 22
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 239000004743 Polypropylene Substances 0.000 claims abstract description 20
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 20
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 20
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 20
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229920001155 polypropylene Polymers 0.000 claims abstract description 20
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 18
- 239000004816 latex Substances 0.000 claims abstract description 17
- 229920000126 latex Polymers 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000010276 construction Methods 0.000 claims abstract description 11
- 239000004576 sand Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 31
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 9
- 229920001971 elastomer Polymers 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 5
- 239000005977 Ethylene Substances 0.000 claims description 5
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
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- 230000008901 benefit Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 11
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- 238000010521 absorption reaction Methods 0.000 description 1
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- 230000033228 biological regulation Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
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- 238000001816 cooling Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011468 face brick Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
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- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
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- 235000019362 perlite Nutrition 0.000 description 1
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- 238000004321 preservation Methods 0.000 description 1
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Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
-
- 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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/24—Structural elements or technologies for improving thermal insulation
- Y02A30/244—Structural elements or technologies for improving thermal insulation using natural or recycled building materials, e.g. straw, wool, clay or used tires
Abstract
The invention discloses a bonding mortar material special for a foam glass heat insulation system, a preparation method and application thereof, wherein the bonding mortar is prepared from the following raw materials in percentage by mass: 25-50% of P.O4.25 cement, 1-10% of fly ash, 1-5% of silica fume, 48-60% of medium sand, 1.5-3% of redispersible latex powder, 0.03-0.18% of hydroxypropyl methyl cellulose, 0.15-0.25% of polypropylene fiber, 0-0.1% of defoaming agent and 0-0.1% of water reducing agent. The bonding mortar has high flexibility and damage resistance, has higher bonding strength, higher flexibility, damage resistance and weather resistance compared with the traditional mortar, and also has the advantages of easy construction and the like.
Description
Technical Field
The invention relates to a mortar material or a building material, a preparation method and application thereof, in particular to an external wall thermal insulation material, a preparation method and application thereof, which are applied to the technical field of polymer mortar and bonding mortar.
Background
Foam glass (foamglass), also called porous glass, is a light inorganic porous glass-state material which is produced by using waste glass, fly ash, mica, perlite, pumice powder, volcanic ash and the like as main raw materials, adding a proper amount of foaming agent and auxiliary agent, mixing, grinding to prepare a batch mixture, then putting the batch mixture into a heat-resistant mold, and carrying out processes such as preheating, sintering, foaming, cooling, annealing and the like. The foam glass is filled with a large number of tiny and uniform air holes to form a uniform gas-solid two-phase structure. The foam glass has the advantages of low density, low heat conductivity coefficient, low thermal expansion coefficient, stable thermal property, corrosion resistance, incombustibility, long service life, convenient construction and the like, and is a light high-strength heat-insulating material with excellent heat preservation, heat insulation, sound absorption, moisture resistance, fire resistance, corrosion resistance and mildew resistance. Under the promotion of national building energy-saving policies and regulations, the foam glass is widely applied to the field of civil building external wall heat insulation.
After the foam glass is developed for more than ten years in China, the quality of the product is better and stable at present. As a new generation of heat insulation material, with the reduction of production cost, foam glass has started to be applied to the field of civil building external wall heat insulation in recent years, and the market prospect is wide. But some problems appear in the application, wherein the most important are hollowing, cracking and falling off of the foam glass external wall heat insulation system because the performance of the bonding mortar is not up to the standard and is not matched with the foam glass. The foam glass belongs to an inorganic material, is a brittle material, does not have high elasticity of an organic heat-insulating material, so that the bonding mortar of the foam glass is matched with the characteristics of the foam glass, the research on the special bonding mortar is still rare at present, most of the mortar used in construction is mixed on site, the performance is unstable or even does not reach the standard, when the foam glass heat-insulating plate is used for a high-rise building, the bonding layer of the foam glass heat-insulating plate can endure weather erosion for many years and temperature change and always keep firm, otherwise, even if individual face bricks fall down to hurt people, the result is unreasonable. Therefore, the traditional common mortar is difficult to meet the requirements of engineering construction quality, durability and construction efficiency, and the development of a foam glass heat insulation system to the field of civil buildings is restricted.
According to the requirements of the foam glass external thermal insulation system material technical requirements (JG/T469-2015) standard, the basic technical performance indexes of the special bonding mortar for the foam glass external thermal insulation system are as follows:
the basic performance standards of the special bonding mortar for the foam glass comprise tensile bonding strength original strength, water resistance strength, operable time and compression shear bonding original strength.
On the premise of ensuring that the performance indexes are met, the special bonding mortar for the foam glass also needs to have certain flexibility, the highest temperature of the building outer wall can reach more than 60 ℃ in a natural environment under the condition of exposure to sunlight, the temperature change of the building outer wall is close to 50 ℃ in areas with large day-night temperature difference, and when the temperature changes, internal stress can be generated in the bonding mortar due to the fact that the thermal expansion coefficients of different materials are inconsistent. And the stress in the mortar is coordinated by improving the flexibility of the mortar, so that the risk of failure of the foam glass heat-insulating system under a series of natural conditions such as high-temperature sunshine, rain and snow scouring and the like can be reduced. The flexibility of the bonding mortar is quantified by the ratio of the flexural strength to the compressive strength, namely the flexural-compressive ratio indicates that the larger the flexural-compressive ratio is, the better the flexibility of the bonding mortar is, and the smaller the flexural-compressive ratio is, the better the rigidity of the bonding mortar is. Therefore, the flexibility of the bonding mortar special for foam glass is further improved, and the binding force is a technical problem to be solved urgently.
Disclosure of Invention
In order to solve the problems of the prior art, the invention aims to overcome the defects in the prior art and provide the special bonding mortar material for the foam glass heat-insulating system, the preparation method and the application thereof.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a special bonding mortar material for a foam glass heat insulation system is prepared from the following raw materials in percentage by mass:
p.o4.25 cement: 25-50%;
fly ash: 1-10%;
silica fume: 1-5%;
medium sand: 48-60%;
redispersible latex powder: 1.5-3.0%;
hydroxypropyl methylcellulose: 0.03-0.18%;
polypropylene fiber: 0.15-0.25%;
defoaming agent: 0 to 0.1 percent;
water reducing agent: 0 to 0.1%.
Preferably, the fly ash is II-grade fly ash;
preferably, the average particle size of the silica fume is 0.1-0.3 micron;
as the preferred technical scheme of the invention, the redispersible latex powder adopts vinyl acetate/ethylene copolymerized rubber powder, the stabilizing system is polyvinyl alcohol, and the lowest film-forming temperature is less than or equal to 0 ℃;
preferably, the viscosity of the hydroxypropyl methyl cellulose is 50000-100000 mPa.s;
preferably, 1-4 mm short fibers are adopted as the polypropylene fibers; the most preferable polypropylene fiber adopts 3mm short fiber;
preferably, the defoaming agent is a modified polysiloxane defoaming agent;
preferably, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate of the mortar is more than or equal to 25%.
As the preferred technical scheme of the invention, the tensile bonding strength of the bonding mortar material special for the foam glass heat-insulating system is more than or equal to 1.15MPa, and the folding-compression ratio is more than or equal to 0.340.
As the preferable technical scheme of the invention, the special adhesive mortar material for the foam glass heat insulation system is used for constructing the external heat insulation system and is used as an adhesive for adhering the foam glass plate to the wall.
The preparation method of the bonding mortar material is characterized in that the bonding mortar material is a bonding mortar material special for the foam glass heat insulation system, and the preparation method comprises the following steps:
(1) weighing the raw materials according to the mass percentage;
(2) firstly, adding weighed cement, sand, fly ash and silica fume into a stirrer, and carrying out primary stirring;
the stirring amount is 30-70% of the capacity of the stirrer, and the materials are mixed and stirred for 3-8 minutes at a stirring speed of 100-130 r/min;
(3) adding hydroxypropyl methyl cellulose ether, redispersible latex powder, polypropylene fiber, a water reducing agent and a defoaming agent into the stirrer, and then continuously stirring for 3-10 minutes at a stirring speed of 100-130 r/min;
(4) and (4) sealing and waterproof packaging the stirred materials to obtain the bonding mortar product.
As a preferable technical scheme of the invention, in the step (2), the preliminary stirring is carried out for mixing and stirring for 5-8 minutes, and the stirring speed is 120-130 r/min.
In the preferable technical scheme of the invention, in the step (2), the stirring speed for continuously stirring is 120-130 r/min.
The invention relates to an application of a bonding mortar material special for a foam glass heat-insulating system, which comprises the following steps: adding water into a construction site for mixing, firstly mixing the dry powder material of the bonding mortar and the water according to the mass ratio of 1 (0.16-0.25), uniformly stirring, and then bonding the foam glass plate on a wall.
Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:
1. the special adhesive mortar material for the foam glass heat-insulating system can greatly improve the fracture ratio and the adhesive strength of mortar, improve various performance indexes such as thermal shock resistance, weather resistance and the like, and has high flexibility and damage resistance;
2. compared with the traditional mortar, the bonding mortar has higher bonding strength, higher flexibility, damage resistance and weather resistance, and also has the advantages of easy construction and the like;
3. the method is simple and easy to implement, low in cost and suitable for popularization and application.
Drawings
FIG. 1 is a microstructure diagram of a mortar of a comparative example.
FIG. 2 is a microstructure of mortar according to an embodiment of the present invention.
FIG. 3 is a diagram showing the bonding effect of four mortars and foam glass according to the embodiment of the invention.
Detailed Description
The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:
the first embodiment is as follows:
in this embodiment, the bonding mortar material special for the foam glass external thermal insulation system is prepared from the following raw materials in proportion:
34kg of P.O4.25 cement;
4kg of fly ash;
2kg of silica fume;
60kg of medium sand;
2.5kg of redispersible latex powder;
0.18kg of hydroxypropyl methyl cellulose;
0.2kg of polypropylene fiber;
0.1kg of defoaming agent;
0.1kg of water reducing agent.
In this example, the p.o4.25 cement is a spring landscape brand, and is the main cementing material for the bonding mortar. Fly ash is a secondary fly ash that has pozzolanic activity that will participate in the consumption of more alkali in the mortar. The average particle size of the silica fume is 0.1-0.3 micron, and the silica fume has a large specific surface area and plays a positive role in the water retention performance of the mortar.
The dispersible latex powder is vinyl acetate/ethylene binary copolymer rubber powder which can be redispersed in water, and is Wanwei 8050 latex powder. The purpose of adding the rubber powder is to improve the adhesive force between the bonding mortar and the foam glass, improve the mechanical property of the mortar and simultaneously improve the flexibility of the mortar.
The cellulose ether is domestic hydroxypropyl methylcellulose (HPMC) with viscosity of 100000 mPa.s. The HPMC is added to improve the water retention property of the bonding mortar and simultaneously improve the workability and the anti-sagging property of the mortar.
The fibers are 3mm polypropylene staple fibers. The polypropylene short fibers are added to improve the fracture resistance of the mortar and improve the flexibility and durability of the mortar.
The defoaming agent is a modified polysiloxane defoaming agent, preferably American Mediterranean drawing DF770 DD. The polymer additive has an air-entraining effect, and a large amount of micro bubbles can be introduced into the mortar in the process of adding water and stirring, the fluidity of the mortar can be improved by the bubbles, the stirring difficulty is reduced, and the mechanical property of the mortar is reduced by the introduction of the bubbles. The purpose of adding the defoaming agent is to properly reduce micro bubbles in the mortar and reduce the influence of the air-entraining effect of the polymer additive on the mechanical property of the mortar.
The water reducing agent is a polycarboxylic acid water reducing agent. The purpose of adding the water reducing agent is to improve the early strength of the bonding mortar and improve the fluidity of the mortar.
The mortar formulation described in this example has the following performance test results:
TABLE 1 mortar Performance test results
The performances of the bonding mortar meet the requirements of JGT469-2015 foam glass external thermal insulation system material technical requirements, and the bonding mortar is easy to mix and convenient to use.
In order to further illustrate the superior performance of the mortar formula of the embodiment, the common mortar is introduced as a first comparative example, and the common mortar is prepared from the following raw materials in proportion:
40kg of P.O4.25 cement;
60kg of medium sand;
the raw materials used in the first comparative example were the same as those used in the first example, and the results of the mortar performance test were summarized in the following table 2:
TABLE 2 comparison of the results of the mortar performance tests made in the first comparative example and the first example
Compared with the common mortar, the tensile bonding strength of the mortar of the embodiment is obviously improved. The bending-pressing ratio is an index for representing the flexibility of the mortar, the larger the index is, the better the flexibility of the mortar is, and the flexibility of the mortar in the embodiment is obviously improved compared with that of the common mortar, so that the quality advantage of the mortar in the embodiment is further illustrated.
FIGS. 1 and 2 are SEM micrographs of mortars of comparative example one and example one, respectively. As can be seen by comparing FIG. 1 with FIG. 2, the mortar of the comparative example has many cracks and defects inside, and the flocculent C-S-H gels have many pores, loose structures and cracks; the embodiment discloses a polymer admixture in mortar, which is attached among flocculent C-S-H gels in the form of granular or smaller flaky membranes to form a continuous three-dimensional network structure, and the cementing action and flexibility of the admixture can effectively improve the rigid structure of a cement material.
Example two:
this embodiment is substantially the same as the first embodiment, and is characterized in that:
in this embodiment, a preparation method of a bonding mortar special for a foam glass external thermal insulation system includes the following preparation steps:
(1) weighing raw materials according to the mass of the raw materials in the embodiment, wherein the weighing precision is +/-0.5%;
(2) firstly, adding weighed cement, sand, fly ash and silica fume into a stirrer, wherein the stirring amount is 30-70% of the capacity of the stirrer, and mixing and stirring for 5 minutes at the stirring speed of 120 r/min;
(3) adding hydroxypropyl methyl cellulose ether, redispersible latex powder, polypropylene fiber, a water reducing agent and a defoaming agent, and then continuing stirring for 10 minutes at a stirring speed of 120 r/min;
(4) and (5) sealing and waterproof packaging the stirred materials.
The bonding mortar prepared by the embodiment is used by adding water and mixing in a construction site, the mixing water consumption is controlled to be 0.16-0.25 times of the dry mixture quality, and a mortar mixer or a handheld electric mixer is used for mixing for more than 180s and then used for bonding the foam glass outer wall.
The bonding mortar special for the foam glass has good matching performance with the foam glass external insulation system from the physical characteristics of the foam glass, the tensile bonding strength of the bonding mortar is far beyond the requirements of national or industrial standards, and the bonding mortar has good flexibility to contain the brittleness of the foam glass, so that the risk of failure and falling of the foam glass external insulation system can be effectively reduced. Compared with the traditional mortar, the bonding mortar of the embodiment has the advantages of higher bonding strength, higher flexibility, damage resistance and weather resistance, easiness in construction and the like.
Example three:
in this embodiment, the bonding mortar material special for the foam glass external thermal insulation system is prepared from the following raw materials in proportion:
34kg of P.O4.25 cement;
4kg of fly ash;
2kg of silica fume;
60kg of medium sand;
2.5kg of redispersible latex powder;
0.06kg of hydroxypropyl methyl cellulose;
0.25kg of polypropylene fiber;
0.1kg of defoaming agent;
0.1kg of water reducing agent; .
In this example, the p.o4.25 cement is a spring landscape brand, and is the main cementing material for the bonding mortar. Fly ash is a secondary fly ash that has pozzolanic activity that will participate in the consumption of more alkali in the mortar. The average particle size of the silica fume is 0.1-0.3 micron, and the silica fume has a large specific surface area and plays a positive role in the water retention performance of the mortar.
The dispersible latex powder is vinyl acetate/ethylene binary copolymer rubber powder which can be redispersed in water, and is Wanwei 8050 latex powder. The purpose of adding the rubber powder is to improve the adhesive force between the bonding mortar and the foam glass, improve the mechanical property of the mortar and simultaneously improve the flexibility of the mortar.
The cellulose ether is domestic hydroxypropyl methylcellulose (HPMC) with viscosity of 100000 mPa.s. The HPMC is added to improve the water retention property of the bonding mortar and simultaneously improve the workability and the anti-sagging property of the mortar.
The fibers are 3mm polypropylene staple fibers. The polypropylene short fibers are added to improve the fracture resistance of the mortar and improve the flexibility and durability of the mortar.
The defoaming agent is a modified polysiloxane defoaming agent, preferably American Mediterranean drawing DF770 DD. The polymer additive has an air-entraining effect, and a large amount of micro bubbles can be introduced into the mortar in the process of adding water and stirring, the fluidity of the mortar can be improved by the bubbles, the stirring difficulty is reduced, and the mechanical property of the mortar is reduced by the introduction of the bubbles. The purpose of adding the defoaming agent is to properly reduce micro bubbles in the mortar and reduce the influence of the air-entraining effect of the polymer additive on the mechanical property of the mortar.
The water reducing agent is a polycarboxylic acid water reducing agent. The purpose of adding the water reducing agent is to improve the early strength of the bonding mortar and improve the fluidity of the mortar.
In the embodiment, various properties of the mortar meet the requirements of JGT469-2015 foam glass external thermal insulation system material technical requirements, and in order to further illustrate the superior properties of the mortar formula in the embodiment, a second comparative example is introduced, and is prepared from the following raw materials in proportion:
34kg of P.O4.25 cement;
4kg of fly ash;
2kg of silica fume;
60kg of medium sand;
0.1kg of polypropylene fiber;
comparative example two versus example two performance comparison table 3 below:
TABLE 3 comparison of the results of the mortar performance tests made in the second comparative example and the first example
| Mortar formula | Example two | Comparative example II |
| Tensile bond strength/MPa (with cement mortar) | 1.20 | 0.69 |
| Tensile bond strength/MPa (with foam glass) | 0.21 | 0.06 |
| Folding ratio | 0.349 | 0.289 |
Example four:
in this embodiment, the bonding mortar material special for the foam glass external thermal insulation system is prepared from the following raw materials in proportion:
42.5kg of P.O4.25 cement;
5kg of fly ash;
2.5kg of silica fume;
50kg of medium sand;
2.0kg of redispersible latex powder;
0.12kg of hydroxypropyl methyl cellulose;
0.2kg of polypropylene fiber;
0.1kg of defoaming agent;
0.1kg of water reducing agent; .
In this example, the p.o4.25 cement is a spring landscape brand, and is the main cementing material for the bonding mortar. Fly ash is a secondary fly ash that has pozzolanic activity that will participate in the consumption of more alkali in the mortar. The average particle size of the silica fume is 0.1-0.3 micron, and the silica fume has a large specific surface area and plays a positive role in the water retention performance of the mortar.
The dispersible latex powder is vinyl acetate/ethylene binary copolymer rubber powder which can be redispersed in water, and is Wanwei 8050 latex powder. The purpose of adding the rubber powder is to improve the adhesive force between the bonding mortar and the foam glass, improve the mechanical property of the mortar and simultaneously improve the flexibility of the mortar.
The cellulose ether is domestic hydroxypropyl methylcellulose (HPMC) with viscosity of 100000 mPa.s. The HPMC is added to improve the water retention property of the bonding mortar and simultaneously improve the workability and the anti-sagging property of the mortar.
The fibers are 3mm polypropylene staple fibers. The polypropylene short fibers are added to improve the fracture resistance of the mortar and improve the flexibility and durability of the mortar.
The defoaming agent is a modified polysiloxane defoaming agent, preferably American Mediterranean drawing DF770 DD. The polymer additive has an air-entraining effect, and a large amount of micro bubbles can be introduced into the mortar in the process of adding water and stirring, the fluidity of the mortar can be improved by the bubbles, the stirring difficulty is reduced, and the mechanical property of the mortar is reduced by the introduction of the bubbles. The purpose of adding the defoaming agent is to properly reduce micro bubbles in the mortar and reduce the influence of the air-entraining effect of the polymer additive on the mechanical property of the mortar.
The water reducing agent is a polycarboxylic acid water reducing agent. The purpose of adding the water reducing agent is to improve the early strength of the bonding mortar and improve the fluidity of the mortar.
The tensile bond strength of the mortar measured in the example is 1.15MPa, and the folding ratio is 0.340, which proves that the mortar has higher tensile bond strength and flexibility compared with the common mortar.
Fig. 3 shows the bonding effect between the four mortars and the foam glass in the embodiment, and it can be seen that the special bonding mortar can be diffused into the pores of the foam glass because the surface of the foam glass is porous, and the mortar is partially embedded in the foam glass plate after being dried and hardened to form mechanical embedding, so that the bonding stability is improved.
Compared with the common mortar, the bonding mortar material special for the foam glass heat insulation system in the embodiment can greatly improve various performance indexes such as the breaking ratio, the bonding strength and the like of the mortar, and has high flexibility and damage resistance; compared with the traditional mortar, the bonding mortar of the embodiment has the advantages of higher bonding strength, higher flexibility, damage resistance and weather resistance, easiness in construction and the like.
The present invention is described in detail with reference to the embodiments, but the present invention is not limited to the embodiments, and various changes and modifications can be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitutions, so long as the invention is consistent with the purpose of the present invention, and the invention shall fall within the protection scope of the present invention without departing from the technical principles and inventive concepts of the special bonding mortar material for the foam glass insulation system, the preparation method and the application thereof.
Claims (9)
1. The special bonding mortar material for the foam glass heat insulation system is characterized by being prepared from the following raw materials in percentage by mass:
p.o4.25 cement: 25-50%;
fly ash: 1-10%;
silica fume: 1-5%;
medium sand: 48-60%;
redispersible latex powder: 1.5-3.0%;
hydroxypropyl methylcellulose: 0.03-0.18%;
polypropylene fiber: 0.15 to 0.25 percent;
defoaming agent: 0 to 0.1 percent;
water reducing agent: 0 to 0.1%.
2. The bonding mortar material special for the foam glass insulation system according to claim 1, characterized in that:
the fly ash is grade II fly ash;
or the average particle size of the silica fume is 0.1-0.3 micron;
or the redispersible latex powder adopts vinyl acetate/ethylene copolymerized rubber powder, the stabilizing system is polyvinyl alcohol, and the lowest film forming temperature is less than or equal to 0 ℃;
or the viscosity of the hydroxypropyl methyl cellulose is 50000-100000 mPa.s;
or the polypropylene fiber is short fiber with the diameter of 1-4 mm;
or the defoaming agent is a modified polysiloxane defoaming agent;
or the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate of the mortar is more than or equal to 25%.
3. The bonding mortar material special for the foam glass insulation system according to claim 2, characterized in that: the polypropylene fiber is 3mm short fiber.
4. The bonding mortar material special for the foam glass insulation system according to claim 1, characterized in that: the tensile bonding strength is more than or equal to 1.15MPa, and the folding-compression ratio is more than or equal to 0.340.
5. The bonding mortar material special for the foam glass insulation system according to claim 1, characterized in that: the adhesive is used for constructing an external thermal insulation system and is used as an adhesive for adhering the foam glass plate to the wall.
6. A preparation method of a bonding mortar material, wherein the bonding mortar is the bonding mortar material special for the foam glass heat-insulating system in claim 1, and is characterized by comprising the following steps:
(1) weighing the raw materials according to the mass percentage;
(2) firstly, adding weighed cement, sand, fly ash and silica fume into a stirrer, and carrying out primary stirring;
the stirring amount is 30-70% of the capacity of the stirrer, and the materials are mixed and stirred for 3-8 minutes at a stirring speed of 100-130 r/min;
(3) adding hydroxypropyl methyl cellulose ether, redispersible latex powder, polypropylene fiber, a water reducing agent and a defoaming agent into the stirrer, and then continuously stirring for 3-10 minutes at a stirring speed of 100-130 r/min;
(4) and (4) sealing and waterproof packaging the stirred materials to obtain the bonding mortar product.
7. The method for producing a bonding mortar material according to claim 6, characterized in that: in the step (2), the mixture is stirred for 5-8 minutes at a stirring speed of 120-130 r/min.
8. The method for producing a bonding mortar material according to claim 6, characterized in that: in the step (2), the stirring speed for continuously stirring is 120-130 r/min.
9. The application of the special bonding mortar material for the foam glass insulation system in claim 1, wherein the use method of the special bonding mortar material for the foam glass insulation system is as follows: adding water into a construction site for mixing, firstly mixing the dry powder material of the bonding mortar and the water according to the mass ratio of 1 (0.16-0.25), uniformly stirring, and then bonding the foam glass plate on a wall.
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| CN116217141A (en) * | 2023-01-06 | 2023-06-06 | 山东盛都节能科技有限公司 | Novel special bonding mortar dry powder for heat preservation system and bonding mortar |
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Application publication date: 20201009 |