CN112830749A - Thermal insulation mortar prepared from waste bricks and tiles and preparation method thereof - Google Patents
Thermal insulation mortar prepared from waste bricks and tiles and preparation method thereof Download PDFInfo
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- CN112830749A CN112830749A CN202110080418.8A CN202110080418A CN112830749A CN 112830749 A CN112830749 A CN 112830749A CN 202110080418 A CN202110080418 A CN 202110080418A CN 112830749 A CN112830749 A CN 112830749A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- C—CHEMISTRY; METALLURGY
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
Abstract
The invention relates to thermal insulation mortar prepared from waste bricks and tiles and a preparation method thereof, belonging to the field of building materials, and the thermal insulation mortar comprises the following components in parts by weight: 400-500 parts of cementing material, 100-280 parts of quartz sand, 400 parts of modified waste brick and tile particles, 7-10 parts of cellulose, 2-5 parts of water reducing agent and 2-4 parts of tackifier; the particle size of the modified waste bricks and tiles is 0.5-2mm, and the stacking area is 70-90kg/m3(ii) a The vitrified waste brick and tile aggregate and the quartz sand are used as the aggregate, and the portland cement or aluminate cement is used as the cementing material, so that the resource utilization of the waste brick and tile can be realized, and the problems of environmental pollution, resource and energy consumption and the like caused by the waste brick and tile can be reduced to the maximum extent; the invention carries out crushing processing on the waste bricks and tiles to prepare waste brick and tile particles, increases the specific surface area and the porosity of the waste brick and tile particles through acidification, vitrification and modification, and reduces the water absorption rate and the heat conduction system of the waste brick and tile particlesThereby reducing the thermal conductivity of the waste brick and tile particles and effectively improving the thermal insulation performance of the mortar.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to thermal insulation mortar prepared from waste bricks and tiles and a preparation method thereof.
Background
The building energy consumption generally refers to the energy consumption of a civil building in the using process, and mainly comprises the energy consumption of heating, ventilation, air conditioning, illumination, water supply and drainage, elevators and the like of the building. The building, one of the largest energy consumers in the world, consumes energy and releases greenhouse gas to the air, which accounts for more than one fourth of the total energy consumption in the world. The building energy consumption is one of the largest energy consumers, and the building energy consumption belongs to the field of energy consumption with the largest energy-saving potential. Therefore, building energy conservation is an important point for energy-saving work. In the current means of building energy conservation, thermal insulation mortar is often adopted as building mortar so as to achieve the effect of energy conservation. The existing thermal mortar is often prepared from natural stones, but the natural stones are insufficient in reserves, so that the problem of shortage of natural stone resources becomes a factor for restricting the promotion of energy-saving work of buildings.
On the other hand, due to the constant development of the construction industry and the demolition of a large number of old buildings, the production of urban construction waste, in particular waste tiles, is increasing. At present, no corresponding specific measures are provided for reasonably disposing the waste bricks and tiles, and the waste bricks and tiles are generally simply sent to a refuse landfill for landfill treatment instead of being recycled in a new building. A large amount of waste bricks and tiles are mainly buried, not only occupy cultivated land resources, but also cause serious damage to the surrounding ecological environment for a long time.
Therefore, if the waste bricks and tiles are recycled and utilized as the raw materials for preparing the thermal insulation mortar, the problem of shortage of natural stones is solved, the energy-saving work of the building can be completed to the maximum extent, and the energy consumption of the building is thoroughly reduced.
Disclosure of Invention
In order to overcome the problems in the background art, the invention provides the thermal insulation mortar prepared from the waste bricks and tiles and the preparation method thereof, which can recycle the waste bricks and tiles into resources, utilize the waste bricks and tiles as the raw materials for preparing the thermal insulation mortar, solve the problem of shortage of natural stones, complete the energy-saving work of buildings to the maximum extent and completely reduce the energy consumption of the buildings.
In order to realize the purpose, the invention is realized by the following technical scheme:
the thermal insulation mortar prepared from waste bricks and tiles comprises the following components in parts by weight: 400-500 parts of cementing material, 100-280 parts of quartz sand, 400 parts of modified waste brick and tile particles, 7-10 parts of cellulose, 2-5 parts of water reducing agent and 2-4 parts of tackifier; the granularity of the modified waste bricks and tiles is 0.5-2mm,the stacking area is 70-90kg/m3。
Further, the modified waste tile particles are prepared by the following steps: (1) treatment of waste bricks and tiles: sorting waste bricks and tiles from the construction waste, and crushing the waste bricks and tiles by using a crushing device, wherein the granularity of the waste bricks and tiles is 0.3-0.8 mm; (2) acidizing waste brick and tile particles: adding 500-1000 parts by weight of water into the waste tile micro powder obtained in the step (1) for pulping, then adding hydrochloric acid, wherein the amount of the hydrochloric acid is 0.5-1.2 times of the cation exchange capacity of the waste tile micro powder, soaking and activating for 1-2 days, and performing filter pressing and dehydration to obtain acid-activated waste tile particles; (3) preheating and dehydrating; (4) hollow vitrification: putting the preheated and dehydrated waste brick and tile particles into a vitrification furnace for vitrification, wherein the temperature of the vitrification furnace is 1000-1500 ℃; (5) modification of waste tile particles: drying the expanded waste brick and tile particles at 105 ℃ for two hours, diluting phenolic resin by using a certain amount of absolute ethyl alcohol, uniformly coating the diluted phenolic resin on the surfaces of the expanded waste brick and tile particles, and curing the particles at 160 ℃ for hours to obtain modified expanded waste brick and tile particles, wherein the mass percentage of the phenolic resin and the expanded waste brick and tile particles is 80-120%; (6) sorting: and (3) sorting the modified waste brick and tile particles by screening, and sorting and collecting the particles with the particle size of 0.5-2.0 mm.
Further, the preheating dehydration specifically comprises: preheating the acidified waste tile micro powder at 300 ℃, and controlling the water content to be 0.2-3%.
Further, the amount of the absolute ethyl alcohol to be diluted is 10 parts per 100 parts of the phenolic resin.
Furthermore, the granularity of the quartz sand is 4-8 mm.
Furthermore, the cementing material is portland cement or aluminate cement; the cellulose is methyl cellulose ether or hydroxypropyl methyl cellulose ether; the water reducing agent is a polycarboxylic acid powder high-efficiency water reducing agent; the tackifier is ethylene-vinyl acetate copolymer latex powder or acrylic latex powder.
A preparation method of thermal insulation mortar prepared from waste bricks and tiles comprises the following steps: (1) preparing a cementing material, quartz sand, modified waste brick and tile particles, cellulose, a water reducing agent and a tackifier according to parts by weight; (2) firstly, placing the cementing material, the quartz sand and the modified waste brick and tile particles into a stirring device for mixing and stirring for 10-20 minutes; (3) adding the water reducing agent and the tackifier into the stirring device, mixing and stirring for 8-15 minutes; (4) finally, adding cellulose into the stirring device, mixing and stirring for 5-8 minutes, and bagging to obtain the thermal insulation mortar prepared from the waste bricks and tiles.
The invention has the beneficial effects that:
according to the invention, the fire resistance of the mortar can be effectively improved under the synergistic effect of the components by optimizing the mixture ratio of the components of the mortar.
According to the invention, the quartz sand and the modified waste brick and tile particles are used as mortar aggregates, and the portland cement or aluminate cement is used as a cementing material, so that the waste bricks and tiles can be recycled, and the problems of environmental pollution, resource and energy consumption and the like caused by the waste bricks and tiles are reduced to the maximum extent; the invention selects waste bricks and tiles from construction waste, crushes the waste bricks and tiles to prepare waste brick and tile particles with the granularity of 0.3-0.8mm, uses hydrogen ions to replace exchangeable calcium, magnesium and other ions through acidification by hydrochloric acid, and the hydrochloric acid can enable the waste brick and tile particles to form surfaces with fine holes, the specific surface area and the porosity are both increased, and the thermal conductivity of the waste brick and tile particles can be reduced through the increase of the porosity.
And then modifying, wherein the phenolic resin uniformly forms a layer of enhancement layer on the surface of the expanded waste tile particles, the thermosetting phenolic resin is crosslinked to form an insoluble and infusible structure after being cured, the structure can be coated on the expanded waste tile particles, and the density of the enhancement layer is greater than the density of the expanded waste tile particles, so that the bulk density of the expanded waste tile particles is increased to a certain extent. Before modification, the expanded waste tile particles absorb water mainly through the following two ways, namely, firstly, the surface absorbs water, and secondly, the expanded waste tile particles provide a channel for water to enter the inside of the expanded waste tile particles due to the surface defects of the expanded waste tile particles, such as incomplete surface vitrification sealing, generated breakage in the transportation or stirring process and the like, and the water is directly absorbed or absorbed by the expanded vitrified micro balls through the capillary effect. After the phenolic resin is coated and modified, a resin layer formed by crosslinking and curing the phenolic resin is uniformly distributed on the surface of the expanded waste tile particles, the resin layer has the effects of enhancing and dewatering, and the dewatering shows that the surface defects of the expanded waste tile particles are sealed, so that the absorption and adsorption of the expanded waste tile particles to water are prevented, and the effect of reducing the water absorption rate is achieved. The thermal conductivity coefficient of the modified expanded waste brick and tile particles is reduced, and the modified expanded waste brick and tile particles are better used in thermal insulation mortar.
According to the invention, the quartz sand is used as the framework of the mortar, so that the fireproof performance of the mortar is ensured, and the mechanical properties of the mortar, such as compression resistance, fracture resistance and the like, are also ensured. When the mortar is subjected to a force, the quartz sand is generally subjected to a large load. In addition, in the hardening process of the mortar, the quartz sand does not generate volume change caused by chemical reaction.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below to facilitate understanding of the skilled person.
Example 1
The thermal insulation mortar prepared from waste bricks and tiles comprises the following components in parts by weight: 400 parts of aluminate cement, 280 parts of quartz sand, 2mm of granularity and 85kg/m of stacking area3300 parts of modified waste tile particles, 9 parts of methyl cellulose ether, 2 parts of polycarboxylic acid powder high-efficiency water reducing agent and 3 parts of acrylic latex powder;
the modified waste brick and tile particles are prepared by the following steps: (1) treatment of waste bricks and tiles: sorting waste bricks and tiles from the construction waste, and crushing the waste bricks and tiles by using a crushing device, wherein the granularity of the waste bricks and tiles is 0.8 mm; (2) acidizing waste brick and tile particles: adding 800 parts by weight of water into the waste tile micro powder obtained in the step (1) for pulping, then adding hydrochloric acid, wherein the dosage of the hydrochloric acid is 0.7 times of the cation exchange capacity of the waste tile micro powder, soaking and activating for 2 days, and performing filter pressing and dehydration to obtain acid activated waste tile particles; (3) preheating and dehydrating: preheating the acidified waste tile micro powder at 300 ℃ to ensure that the water content of the acidified waste tile micro powder is 3%; (4) hollow vitrification: putting the preheated and dehydrated waste brick and tile particles into a vitrification furnace for vitrification, wherein the temperature of the vitrification furnace is 1250 ℃; (5) modification of waste tile particles: drying the expanded waste brick and tile particles at 105 ℃ for two hours, diluting phenolic resin by using a certain amount of absolute ethyl alcohol, uniformly coating the phenolic resin on the surfaces of the expanded waste brick and tile particles, and curing at 160 ℃ for hours to obtain modified expanded waste brick and tile particles, wherein the mass percentage of the adopted phenolic resin to the expanded waste brick and tile particles is 100%, and the dilution amount of the absolute ethyl alcohol is 10 parts of the absolute ethyl alcohol added to 100 parts of the phenolic resin; (6) sorting: and (4) sorting the modified waste tile particles by screening, and sorting and collecting the particles with the particle size of 2.0 mm.
A preparation method of thermal insulation mortar prepared from waste bricks and tiles comprises the following steps: (1) preparing component materials according to parts by weight; (2) putting aluminate cement, quartz sand and modified waste brick and tile particles into a stirring device, and mixing and stirring for 14 minutes; (3) adding the polycarboxylic acid powder high-efficiency water reducing agent and the acrylic latex powder into the stirring device, and mixing and stirring for 10 minutes; (4) and finally, adding methyl cellulose ether into the stirring device, mixing and stirring for 8 minutes, and bagging to obtain the thermal insulation mortar prepared from the waste bricks and tiles.
Example 2
The thermal insulation mortar prepared from waste bricks and tiles comprises the following components in parts by weight: 500 parts of Portland cement, 100 parts of quartz sand, 1.5mm of granularity and 70kg/m of stacking area3300 parts of modified waste brick and tile particles, 10 parts of hydroxypropyl methyl cellulose ether, 5 parts of polycarboxylic acid type powder high-efficiency water reducing agent and 4 parts of ethylene-vinyl acetate copolymer emulsion powder;
the modified waste brick and tile particles are prepared by the following steps: (1) treatment of waste bricks and tiles: sorting waste bricks and tiles from the construction waste, and crushing the waste bricks and tiles by using a crushing device, wherein the granularity of the waste bricks and tiles is 0.6 mm; (2) acidizing waste brick and tile particles: adding 1000 parts by weight of water into the waste tile micro powder obtained in the step (1) for pulping, then adding hydrochloric acid, wherein the dosage of the hydrochloric acid is 1.2 times of the cation exchange capacity of the waste tile micro powder, soaking and activating for 2 days, and performing filter pressing and dehydration to obtain acid activated waste tile particles; (3) preheating and dehydrating: preheating the acidified waste tile micro powder at 300 ℃ to ensure that the water content of the acidified waste tile micro powder is 0.2%; (4) hollow vitrification: putting the preheated and dehydrated waste brick and tile particles into a vitrification furnace for vitrification, wherein the temperature of the vitrification furnace is 1500 ℃; (5) modification of waste tile particles: drying the expanded waste brick and tile particles at 105 ℃ for two hours, diluting phenolic resin by using a certain amount of absolute ethyl alcohol, uniformly coating the phenolic resin on the surfaces of the expanded waste brick and tile particles, and curing the particles at 160 ℃ for hours to obtain modified expanded waste brick and tile particles, wherein the mass percentage of the adopted phenolic resin to the expanded waste brick and tile particles is 120%, and the dilution amount of the absolute ethyl alcohol is 10 parts per 100 parts of the phenolic resin; (6) sorting: and (4) sorting the modified waste tile particles by screening, and sorting and collecting the particles with the granularity of 1.5 mm.
A preparation method of thermal insulation mortar prepared from waste bricks and tiles comprises the following steps: (1) preparing component materials according to parts by weight; (2) firstly, putting the Portland cement, the quartz sand and the modified waste brick and tile particles into a stirring device, and mixing and stirring for 20 minutes; (3) adding the polycarboxylic acid powder high-efficiency water reducing agent and the ethylene-vinyl acetate copolymer latex powder into the stirring device, and mixing and stirring for 15 minutes; (4) and finally, adding hydroxypropyl methyl cellulose ether into the stirring device, mixing and stirring for 7 minutes, and bagging to obtain the thermal insulation mortar prepared from the waste bricks and tiles.
Example 3
The thermal insulation mortar prepared from waste bricks and tiles comprises the following components in parts by weight: 420 parts of Portland cement, 180 parts of quartz sand, 0.5mm of granularity and 90kg/m of stacking area3400 parts of modified waste tile particles, 7 parts of hydroxypropyl methyl cellulose ether, 4 parts of polycarboxylic powder high-efficiency water reducing agent and 2 parts of ethylene-vinyl acetate copolymer emulsion powder;
the modified waste brick and tile particles are prepared by the following steps: (1) treatment of waste bricks and tiles: sorting waste bricks and tiles from the construction waste, and crushing the waste bricks and tiles by using a crushing device, wherein the granularity of the waste bricks and tiles is 0.3 mm; (2) acidizing waste brick and tile particles: adding 500 parts by weight of water into the waste tile micro powder obtained in the step (1) for pulping, then adding hydrochloric acid, wherein the amount of the hydrochloric acid is 0.5 times of the cation exchange capacity of the waste tile micro powder, soaking and activating for 1 day, and performing filter pressing and dehydration to obtain acid activated waste tile particles; (3) preheating and dehydrating: preheating the acidified waste tile micro powder at 300 ℃ to ensure that the water content of the acidified waste tile micro powder is 2%; (4) hollow vitrification: putting the preheated and dehydrated waste brick and tile particles into a vitrification furnace for vitrification, wherein the temperature of the vitrification furnace is 1000 ℃; (5) modification of waste tile particles: drying the expanded waste brick and tile particles at 105 ℃ for two hours, diluting phenolic resin by using a certain amount of absolute ethyl alcohol, uniformly coating the phenolic resin on the surfaces of the expanded waste brick and tile particles, and curing the particles at 160 ℃ for hours to obtain modified expanded waste brick and tile particles, wherein the mass percentage of the adopted phenolic resin to the expanded waste brick and tile particles is 80%, and the dilution amount of the absolute ethyl alcohol is 10 parts per 100 parts of the phenolic resin; (6) sorting: and (4) sorting the modified waste brick and tile particles by screening, and sorting and collecting the particles with the granularity of 0.5 mm.
A preparation method of thermal insulation mortar prepared from waste bricks and tiles comprises the following steps: (1) preparing component materials according to parts by weight; (2) firstly, putting the Portland cement, the quartz sand and the modified waste brick and tile particles into a stirring device for mixing and stirring for 10 minutes; (3) adding the polycarboxylic acid powder high-efficiency water reducing agent and the ethylene-vinyl acetate copolymer latex powder into the stirring device, and mixing and stirring for 8 minutes; (4) and finally, adding hydroxypropyl methyl cellulose ether into the stirring device, mixing and stirring for 5 minutes, and bagging to obtain the thermal insulation mortar prepared from the waste bricks and tiles.
Comparative example 1
The mortar comprises the following components in parts by weight: 500 portions of Portland cement, 100 portions of quartz sand, 1.5mm of granularity and 110kg/m of stacking area3300 parts of non-acidified waste tile particles, 10 parts of hydroxypropyl methyl cellulose ether, 5 parts of polycarboxylic powder high-efficiency water reducing agent and 4 parts of ethylene-vinyl acetate copolymer latex powder;
the waste tile particles are prepared by the following steps: (1) treatment of waste bricks and tiles: sorting waste bricks and tiles from the construction waste, and crushing the waste bricks and tiles by using a crushing device, wherein the granularity of the waste bricks and tiles is 0.6 mm; (2) preheating and dehydrating: preheating the waste tile micro powder obtained in the step (1) at 300 ℃ to ensure that the water content of the acidified waste tile micro powder is 0.2%; (3) hollow vitrification: putting the preheated and dehydrated waste brick and tile particles into a vitrification furnace for vitrification, wherein the temperature of the vitrification furnace is 1500 ℃; (4) modification of waste tile particles: drying the expanded waste brick and tile particles at 105 ℃ for two hours, diluting phenolic resin by using a certain amount of absolute ethyl alcohol, uniformly coating the phenolic resin on the surfaces of the expanded waste brick and tile particles, and curing the particles at 160 ℃ for hours to obtain modified expanded waste brick and tile particles, wherein the mass percentage of the adopted phenolic resin to the expanded waste brick and tile particles is 120%, and the dilution amount of the absolute ethyl alcohol is 10 parts per 100 parts of the phenolic resin; (5) sorting: and (4) sorting the modified waste tile particles by screening, and sorting and collecting the particles with the granularity of 1.5 mm.
A preparation method of thermal insulation mortar prepared from waste bricks and tiles comprises the following steps: (1) preparing component materials according to parts by weight; (2) firstly, putting the Portland cement, the quartz sand and the waste brick and tile particles into a stirring device for mixing and stirring for 20 minutes; (3) adding the polycarboxylic acid powder high-efficiency water reducing agent and the ethylene-vinyl acetate copolymer latex powder into the stirring device, and mixing and stirring for 15 minutes; (4) and finally adding hydroxypropyl methyl cellulose ether into the stirring device, mixing and stirring for 7 minutes, and bagging to obtain the mortar.
Comparative example 2
The mortar comprises the following components in parts by weight: 500 parts of Portland cement, 100 parts of quartz sand, 1.5mm of granularity and 70kg/m of stacking area3300 parts of unmodified waste brick and tile particles, 10 parts of hydroxypropyl methyl cellulose ether, 5 parts of polycarboxylic powder high-efficiency water reducing agent and 4 parts of ethylene-vinyl acetate copolymer latex powder;
the vitrified waste tile particles are prepared by the following steps: (1) treatment of waste bricks and tiles: sorting waste bricks and tiles from the construction waste, and crushing the waste bricks and tiles by using a crushing device, wherein the granularity of the waste bricks and tiles is 0.6 mm; (2) acidizing waste brick and tile particles: adding 1000 parts by weight of water into the waste tile micro powder obtained in the step (1) for pulping, then adding hydrochloric acid, wherein the dosage of the hydrochloric acid is 1.2 times of the cation exchange capacity of the waste tile micro powder, soaking and activating for 2 days, and performing filter pressing and dehydration to obtain acid activated waste tile particles; (3) preheating and dehydrating: preheating the acidified waste tile micro powder at 300 ℃ to ensure that the water content of the acidified waste tile micro powder is 0.2%; (4) hollow vitrification: putting the preheated and dehydrated waste brick and tile particles into a vitrification furnace for vitrification, wherein the temperature of the vitrification furnace is 1500 ℃; (5) sorting: and sorting the vitrified waste brick and tile particles by screening, and sorting and collecting the particles with the particle size of 1.5 mm.
A preparation method of thermal insulation mortar prepared from waste bricks and tiles comprises the following steps: (1) preparing component materials according to parts by weight; (2) firstly, putting the Portland cement, the quartz sand and the vitrified waste brick and tile particles into a stirring device for mixing and stirring for 20 minutes; (3) adding the polycarboxylic acid powder high-efficiency water reducing agent and the ethylene-vinyl acetate copolymer latex powder into the stirring device, and mixing and stirring for 15 minutes; (4) and finally, adding hydroxypropyl methyl cellulose ether into the stirring device, mixing and stirring for 7 minutes, and bagging to obtain the thermal insulation mortar prepared from the waste bricks and tiles.
The physicochemical properties of the products of the three examples and the two comparative examples are respectively detected, the detection results are shown in table 1 according to the GB/T25181-2019 method, and as can be seen from table 1, the components and the proportion of the thermal insulation mortar disclosed by the invention can effectively improve the thermal insulation capability of the mortar and simultaneously can effectively ensure the setting time and the fluidity of the mortar. The thermal conductivity of examples 1-3 is significantly less than that of comparative examples 1-2, indicating that the present invention has better fire-proof and thermal insulation properties.
TABLE 1 results of performance index test of examples 1-3 and comparative examples 1-2
The waste tile particles of examples 1-3 and comparative examples 1-2 were tested for their properties, as shown in Table 2
According to the invention, through modification, the phenolic resin uniformly forms a layer of enhancement layer on the surface of the expanded waste tile particles, the thermosetting phenolic resin is crosslinked after being cured to form an insoluble and infusible structure which can be coated on the expanded waste tile particles, and the density of the enhancement layer is greater than the density of the expanded waste tile particles, so that the bulk density of the expanded waste tile particles is increased to a certain extent. Before modification, the expanded waste tile particles absorb water mainly through the following two ways, namely, firstly, the surface absorbs water, and secondly, the expanded waste tile particles provide a channel for water to enter the inside of the expanded waste tile particles due to the surface defects of the expanded waste tile particles, such as incomplete surface vitrification sealing, generated breakage in the transportation or stirring process and the like, and the water is directly absorbed or absorbed by the expanded vitrified micro balls through the capillary effect. After the phenolic resin is coated and modified, a resin layer formed by crosslinking and curing the phenolic resin is uniformly distributed on the surface of the expanded waste tile particles, the resin layer has the effects of enhancing and dewatering, and the dewatering shows that the surface defects of the expanded waste tile particles are sealed, so that the absorption and adsorption of the expanded waste tile particles to water are prevented, and the effect of reducing the water absorption rate is achieved. The thermal conductivity coefficient of the modified expanded waste brick and tile particles is reduced, and the modified expanded waste brick and tile particles are better used in thermal insulation mortar.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (7)
1. Waste brickThe heat-insulating mortar prepared by the tile is characterized in that: the thermal insulation mortar comprises the following components in parts by weight: 400-500 parts of cementing material, 100-280 parts of quartz sand, 400 parts of modified waste brick and tile particles, 7-10 parts of cellulose, 2-5 parts of water reducing agent and 2-4 parts of tackifier; the particle size of the modified waste bricks and tiles is 0.5-2mm, and the stacking area is 70-90kg/m3。
2. The fire-proof mortar prepared from waste tiles according to claim 1, wherein: the modified waste tile particles are prepared by the following steps: (1) treatment of waste bricks and tiles: sorting waste bricks and tiles from the construction waste, and crushing the waste bricks and tiles by using a crushing device, wherein the granularity of the waste bricks and tiles is 0.3-0.8 mm; (2) acidizing waste brick and tile particles: adding 500-1000 parts by weight of water into the waste tile micro powder obtained in the step (1) for pulping, then adding hydrochloric acid, wherein the amount of the hydrochloric acid is 0.5-1.2 times of the cation exchange capacity of the waste tile micro powder, soaking and activating for 1-2 days, and performing filter pressing and dehydration to obtain acid-activated waste tile particles; (3) preheating and dehydrating; (4) hollow vitrification: putting the preheated and dehydrated waste brick and tile particles into a vitrification furnace for vitrification, wherein the temperature of the vitrification furnace is 1000-1500 ℃; (5) modification of waste tile particles: drying the expanded waste brick and tile particles at 105 ℃ for two hours, diluting phenolic resin by using a certain amount of absolute ethyl alcohol, uniformly coating the diluted phenolic resin on the surfaces of the expanded waste brick and tile particles, and curing the particles at 160 ℃ for hours to obtain modified expanded waste brick and tile particles, wherein the weight percentage of the phenolic resin and the expanded waste brick and tile particles is 80-120%; (6) sorting: and (3) sorting the modified waste brick and tile particles by screening, and sorting and collecting the particles with the particle size of 0.5-2.0 mm.
3. The fire-proof mortar prepared from waste tiles according to claim 2, wherein: the preheating dehydration specifically comprises the following steps: preheating the acidified waste tile micro powder at 300 ℃, and controlling the water content to be 0.2-3%.
4. The fire-proof mortar prepared from waste tiles according to claim 2, wherein: the dilution amount of the absolute ethyl alcohol is 10 parts of the absolute ethyl alcohol per 100 parts of the phenolic resin.
5. The fire-proof mortar prepared from waste tiles according to any one of claims 1, 3 and 4, wherein: the granularity of the quartz sand is 4-8 mm.
6. The fire-proof mortar prepared from waste tiles according to claim 5, wherein: the cementing material is Portland cement or aluminate cement; the cellulose is methyl cellulose ether or hydroxypropyl methyl cellulose ether; the water reducing agent is a polycarboxylic acid powder high-efficiency water reducing agent; the tackifier is ethylene-vinyl acetate copolymer latex powder or acrylic latex powder.
7. The method for preparing thermal mortar from waste tiles according to any one of claims 1 to 6, which comprises the following steps: the method comprises the following steps: (1) preparing a cementing material, quartz sand, modified waste brick and tile particles, cellulose, a water reducing agent and a tackifier according to parts by weight; (2) firstly, placing the cementing material, the quartz sand and the modified waste brick and tile particles into a stirring device for mixing and stirring for 10-20 minutes; (3) adding the water reducing agent and the tackifier into the stirring device, mixing and stirring for 8-15 minutes; (4) finally, adding cellulose into the stirring device, mixing and stirring for 5-8 minutes, and bagging to obtain the thermal insulation mortar prepared from the waste bricks and tiles.
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| CN113980623A (en) * | 2021-11-18 | 2022-01-28 | 三棵树涂料股份有限公司 | Bio-based high-strength joint filling repair heat insulation material and preparation method thereof |
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