CN107721320B - Water-retention anti-caking dry-mixed mortar - Google Patents
Water-retention anti-caking dry-mixed mortar Download PDFInfo
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- CN107721320B CN107721320B CN201711149342.XA CN201711149342A CN107721320B CN 107721320 B CN107721320 B CN 107721320B CN 201711149342 A CN201711149342 A CN 201711149342A CN 107721320 B CN107721320 B CN 107721320B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00586—Roofing materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of building mortar, and particularly relates to water-retention anti-caking dry-mixed mortar which comprises the following raw materials: cement, fly ash, silica fume, aggregate, modified wood fiber and composite auxiliary agent; the compound auxiliary agent is obtained by mixing sodium thiosulfate, zinc stearate, sodium sulfamate and calcium formate. Compared with the prior art, the invention has the following advantages: according to the invention, the wood fiber is modified, so that the wood fiber is easy to disperse in the composite material, can be uniformly mixed in the mixed material, has better water absorption and water retention, does not need to dry aggregate before use, does not generate oxidation or agglomeration after being placed for a long time, simplifies the working process, improves the service performance of the material, shortens the condensation time and improves the use efficiency due to the use of the composite auxiliary agent.
Description
Technical Field
The invention belongs to the technical field of building mortar, and particularly relates to water-retaining anti-caking dry-mixed mortar.
Background
The dry-mixed mortar is a granular or powdery material which is formed by physically mixing dry-screened aggregate, an inorganic cementing material, an additive and the like according to a certain proportion, the granular or powdery material is transported to a construction site in a bag or in bulk form, the material can be directly used after being mixed with water, the dry-mixed mortar is widely applied to buildings and decorations, such as masonry, plastering and other projects, the building and decoration industries are rapidly developed along with the continuous acceleration of the urbanization process, the dry-mixed mortar is one of newly-developed dry-mixed materials in the building material field, the demand of the dry-mixed mortar is increasingly short of supply, however, as part of components in the dry-mixed mortar are oxidized and agglomerated after meeting water, the use is influenced, and the building aggregate used in the dry-mixed mortar generally contains more water, therefore, in order to prevent the traditional dry-mixed mortar from being oxidized and agglomerated before being used, the building aggregate must be dried before being prepared, leading to a complex preparation process of the dry-mixed mortar and increasing the preparation cost of the dry-mixed mortar.
Disclosure of Invention
The invention aims to provide the water-retention anti-caking dry-mixed mortar aiming at the problems that the prior dry-mixed mortar can be oxidized and caked before being used.
The invention is realized by the following technical scheme: the water-retention anti-caking dry-mixed mortar comprises the following raw materials in parts by weight: 22-32 parts of cement, 6-10 parts of fly ash, 1.4-2.6 parts of silica fume, 35-45 parts of aggregate, 12-18 parts of modified wood fiber and 0.2-0.4 part of composite auxiliary agent; the composite auxiliary agent is prepared by mixing sodium thiosulfate, zinc stearate, sodium sulfamate and calcium formate in a weight ratio of 5:4:1: 1;
the preparation method of the modified wood fiber comprises the following steps:
(1) crushing sawdust into short fiber of 80-100 meshes, and treating at 80 deg.C for 4-6 hr;
(2) placing the treated short fibers into a constant-temperature magnetic stirring device, arranging a 12-15% sodium hydroxide solution with the mass concentration being 3 times that of the short wood chip raw materials in the constant-temperature magnetic stirring device, continuously stirring for 3.5-4.5 hours under the sealing condition of keeping the temperature of 55-65 ℃, and draining water for later use;
(3) and (2) stirring and reacting the treated material with methyl propionate accounting for 4.5-6.5% of the weight of the material and divinyl sulfone accounting for 1.2-1.8% of the weight of the material at the temperature of 55-62 ℃ for 2-3 hours, standing for 8-10 hours at normal temperature after the reaction is finished, washing for 2-4 times by using absolute ethyl alcohol, and drying to constant weight under the condition of airflow after the reaction is finished.
As a further improvement to the above, the cement is low heat portland cement or medium heat portland cement; the aggregate is one or a mixture of more of organic sand, river sand or crushed particles of construction waste, and the fineness of the aggregate is less than 2 mm; the wood chips are poplar wood chips or locust tree wood chips.
As a further improvement to the above scheme, the stirring speed in the step (2) is 1050-; the air flow drying temperature in the step (3) is 85-95 ℃.
Compared with the prior art, the invention has the following advantages: according to the invention, the wood fiber is modified, so that the wood fiber is easy to disperse in the composite material, can be uniformly mixed in the mixed material, has better water absorption and water retention, can reduce the volume weight of dry powder mortar after being used, improves the mechanical property of the mortar, has good volume stability, can not generate hollowing or cracking phenomenon in the use process, can be widely applied to building materials such as masonry ground, walls or roof plates, and the like, does not need to dry aggregate before being used, can not generate oxidation or agglomeration after being placed for a long time, simplifies the working flow, improves the service performance of the material, can shorten the condensation time and improves the use efficiency by using the composite auxiliary agent.
Detailed Description
Example 1
The water-retention anti-caking dry-mixed mortar comprises the following raw materials in parts by weight: 28 parts of cement, 8 parts of fly ash, 2.2 parts of silica fume, 40 parts of aggregate, 15 parts of modified wood fiber and 0.3 part of composite auxiliary agent; the composite auxiliary agent is prepared by mixing sodium thiosulfate, zinc stearate, sodium sulfamate and calcium formate in a weight ratio of 5:4:1: 1;
the preparation method of the modified wood fiber comprises the following steps:
(1) crushing sawdust raw materials into short fibers of 90 meshes, and treating for 4 hours at 80 ℃ under the far infrared condition for later use;
(2) placing the treated short fibers into a constant-temperature magnetic stirring device, arranging a 12% sodium hydroxide solution with the mass concentration being 3 times that of the short wood chip raw materials in the constant-temperature magnetic stirring device, continuously stirring for 3.5 hours under the sealing condition of keeping the temperature at 60 ℃, and draining water for later use;
(3) and (3) stirring the treated material and methyl propionate accounting for 6.5 percent of the weight of the material and divinyl sulfone accounting for 1.2 percent of the weight of the material to react at 58 ℃ for 2.5 hours, standing the material at normal temperature for 9 hours after the reaction is finished, washing the material for 3 times by using absolute ethyl alcohol, and drying the material under the condition of airflow until the weight of the material is constant to obtain the catalyst.
Wherein the cement is P.MH moderate heat Portland cement; the aggregate is crushed particles of organic sand and construction waste according to a weight ratio of 4:1, and the fineness of the aggregate is less than 2 mm; the wood chips are poplar wood chips; the stirring speed in the step (2) is 1100 revolutions per minute; the airflow drying temperature in the step (3) is 90 ℃.
Example 2
The water-retention anti-caking dry-mixed mortar comprises the following raw materials in parts by weight: 22 parts of cement, 6 parts of fly ash, 2.6 parts of silica fume, 35 parts of aggregate, 12 parts of modified wood fiber and 0.2 part of composite auxiliary agent; the composite auxiliary agent is prepared by mixing sodium thiosulfate, zinc stearate, sodium sulfamate and calcium formate in a weight ratio of 5:4:1: 1;
the preparation method of the modified wood fiber comprises the following steps:
(1) crushing sawdust raw materials into short fibers of 80 meshes, and treating for 4 hours at 80 ℃ under the far infrared condition for later use;
(2) placing the treated short fibers into a constant-temperature magnetic stirring device, arranging a 15% sodium hydroxide solution with the mass concentration which is 3 times that of the short wood chip raw materials in the constant-temperature magnetic stirring device, continuously stirring for 4.5 hours under the sealing condition of keeping the temperature at 55 ℃, and draining water for later use;
(3) and (3) stirring the treated material and methyl propionate accounting for 6.5 percent of the weight of the material and divinyl sulfone accounting for 1.8 percent of the weight of the material to react at the temperature of 62 ℃ for 3 hours, standing the material at normal temperature for 10 hours after the reaction is finished, washing the material for 4 times by using absolute ethyl alcohol, and drying the material under the condition of airflow until the weight of the material is constant to obtain the catalyst.
Wherein the cement is P.LH low-heat portland cement; the aggregate is organic sand and river sand which are mixed according to the weight ratio of 3:1, and the fineness of the aggregate is less than 2 mm; the wood chips are locust tree wood chips; the stirring speed in the step (2) is 1150 revolutions per minute; the air flow drying temperature in the step (3) is 85 ℃.
Example 3
The water-retention anti-caking dry-mixed mortar comprises the following raw materials in parts by weight: 32 parts of cement, 10 parts of fly ash, 1.4 parts of silica fume, 45 parts of aggregate, 18 parts of modified wood fiber and 0.4 part of composite auxiliary agent; the composite auxiliary agent is prepared by mixing sodium thiosulfate, zinc stearate, sodium sulfamate and calcium formate in a weight ratio of 5:4:1: 1;
the preparation method of the modified wood fiber comprises the following steps:
(1) crushing sawdust raw materials into short fibers of 100 meshes, and treating for 6 hours at 80 ℃ under the far infrared condition for later use;
(2) placing the treated short fibers into a constant-temperature magnetic stirring device, arranging a 12% sodium hydroxide solution with the mass concentration being 3 times that of the short wood chip raw materials in the constant-temperature magnetic stirring device, continuously stirring for 3.5 hours under the sealing condition of keeping the temperature at 65 ℃, and draining water for later use;
(3) and (3) stirring the treated material and methyl propionate accounting for 4.5 percent of the weight of the material and divinyl sulfone accounting for 1.2 percent of the weight of the material to react at 55 ℃ for 2 hours, standing the material at normal temperature for 8 hours after the reaction is finished, washing the material for 2 times by using absolute ethyl alcohol, and drying the material under the condition of airflow until the weight of the material is constant to obtain the catalyst.
Wherein the cement is P.LH low-heat portland cement; the aggregate is prepared by mixing crushed particles of organic sand and construction waste according to a weight ratio of 5:1, and the fineness of the aggregate is less than 2 mm; the wood chips are locust tree wood chips; the stirring speed in the step (2) is 1050 revolutions per minute; the air flow drying temperature in the step (3) is 95 ℃.
Example 4
The water-retention anti-caking dry-mixed mortar comprises the following raw materials in parts by weight: 28 parts of cement, 8 parts of fly ash, 2.2 parts of silica fume, 40 parts of aggregate, 15 parts of modified wood fiber and 0.3 part of composite auxiliary agent; the composite auxiliary agent is prepared by mixing sodium thiosulfate, zinc stearate, sodium sulfamate and calcium formate in a weight ratio of 5:4:1: 1;
the preparation method of the modified wood fiber comprises the following steps:
(1) crushing sawdust raw materials into short fibers of 90 meshes, and treating for 4 hours at 80 ℃ under the far infrared condition for later use;
(2) placing the treated short fibers into a constant-temperature magnetic stirring device, arranging a 12% sodium hydroxide solution with the mass concentration being 3 times that of the short wood chip raw materials in the constant-temperature magnetic stirring device, continuously stirring for 3.5 hours under the sealing condition of keeping the temperature at 60 ℃, and draining water for later use;
(3) and (3) stirring the treated material and methyl propionate accounting for 6.5 percent of the weight of the material and divinyl sulfone accounting for 1.2 percent of the weight of the material to react at 58 ℃ for 2.5 hours, standing the material at normal temperature for 9 hours after the reaction is finished, washing the material for 3 times by using absolute ethyl alcohol, and drying the material under the condition of airflow until the weight of the material is constant to obtain the catalyst.
Wherein the cement is P.MH moderate heat Portland cement; the aggregate is crushed particles of organic sand, river sand or construction waste according to the weight ratio of 4:3:1, and the fineness of the aggregate is less than 2 mm; the wood chips are poplar wood chips; the stirring speed in the step (2) is 1100 revolutions per minute; the airflow drying temperature in the step (3) is 90 ℃.
Example 5
The water-retention anti-caking dry-mixed mortar comprises the following raw materials in parts by weight: 28 parts of cement, 8 parts of fly ash, 2.2 parts of silica fume, 40 parts of aggregate, 15 parts of modified wood fiber and 0.3 part of composite auxiliary agent; the composite auxiliary agent is prepared by mixing sodium thiosulfate, zinc stearate, sodium sulfamate and calcium formate in a weight ratio of 5:4:1: 1;
the preparation method of the modified wood fiber comprises the following steps:
(1) crushing sawdust raw materials into short fibers of 90 meshes, and treating for 4 hours at 80 ℃ under the far infrared condition for later use;
(2) placing the treated short fibers into a constant-temperature magnetic stirring device, arranging a 12% sodium hydroxide solution with the mass concentration being 3 times that of the short wood chip raw materials in the constant-temperature magnetic stirring device, continuously stirring for 3.5 hours under the sealing condition of keeping the temperature at 60 ℃, and draining water for later use;
(3) and (3) stirring the treated material and methyl propionate accounting for 6.5 percent of the weight of the material and divinyl sulfone accounting for 1.2 percent of the weight of the material to react at 58 ℃ for 2.5 hours, standing the material at normal temperature for 9 hours after the reaction is finished, washing the material for 3 times by using absolute ethyl alcohol, and drying the material under the condition of airflow until the weight of the material is constant to obtain the catalyst.
Wherein the cement is P.LH low-heat portland cement; the aggregate is crushed particles of organic sand, river sand or construction waste according to the weight ratio of 4:3:1, and the fineness of the aggregate is less than 2 mm; the wood chips are poplar wood chips; the stirring speed in the step (2) is 1100 revolutions per minute; the airflow drying temperature in the step (3) is 90 ℃.
Setting a comparison group 1, replacing the modified wood fiber in the example 5 with the wood fiber with equal weight, and keeping the rest content unchanged; setting a comparison group 2, removing the modified wood fiber in the embodiment 5, and keeping the rest content unchanged; a comparison group 3 is set, the auxiliary agent in the example 5 is replaced by sodium thiosulfate with equal weight, and the rest content is unchanged; after the dry-mixed mortar prepared by each group is stored in the same environment for 3 months, the caking condition of the dry-mixed mortar is detected, and the obtained setting time, compressive strength, water retention and consistency loss rate are detected according to the GB/T25181-2010 method, so that the following results are obtained:
TABLE 1
| Group of | Water content (%) | Caking behavior | Setting time (h) | Compressive strength (MPa) | Water retention (%) | Consistency loss ratio (%) |
| Example 1 | 0.78 | Is free of | 3.7 | 25.2 | 92.7 | 22.3 |
| Example 2 | 0.79 | Is free of | 3.5 | 24.7 | 93.4 | 23.5 |
| Example 3 | 0.75 | Is free of | 3.8 | 25.4 | 92.8 | 22.8 |
| Example 4 | 0.82 | Is free of | 3.4 | 27.6 | 93.2 | 24.6 |
| Example 5 | 0.85 | Is free of | 3.2 | 28.4 | 93.6 | 24.9 |
| Control group 1 | 0.84 | Is free of | 6.4 | 6.4 | 93.7 | 20.3 |
| Control group 2 | 0.47 | Is provided with | 4.8 | 11.5 | 89.2 | 22.4 |
| Control group 3 | 0.64 | Is free of | 5.3 | 24.8 | 93.1 | 23.7 |
As can be seen from the data in the table 1, the dry-mixed mortar prepared by the method has better water retention, can not generate caking phenomenon after being placed for a long time, and has the advantages of certain improvement of compressive strength on the existing basis, better comprehensive performance, capability of shortening the condensation time and improving the use efficiency by using the aid, and wider application range.
Claims (5)
1. The water-retention anti-caking dry-mixed mortar is characterized by comprising the following raw materials in parts by weight: 22-32 parts of cement, 6-10 parts of fly ash, 1.4-2.6 parts of silica fume, 35-45 parts of aggregate, 12-18 parts of modified wood fiber and 0.2-0.4 part of composite auxiliary agent; the composite auxiliary agent is prepared by mixing sodium thiosulfate, zinc stearate, sodium sulfamate and calcium formate in a weight ratio of 5:4:1: 1;
the preparation method of the modified wood fiber comprises the following steps:
(1) crushing sawdust into short fiber of 80-100 meshes, and treating at 80 deg.C for 4-6 hr;
(2) placing the treated short fibers into a constant-temperature magnetic stirring device, arranging a 12-15% sodium hydroxide solution with the mass concentration being 3 times that of the short wood chip raw materials in the constant-temperature magnetic stirring device, continuously stirring for 3.5-4.5 hours under the sealing condition of keeping the temperature of 55-65 ℃, and draining water for later use;
(3) and (2) stirring and reacting the treated material with methyl propionate accounting for 4.5-6.5% of the weight of the material and divinyl sulfone accounting for 1.2-1.8% of the weight of the material at the temperature of 55-62 ℃ for 2-3 hours, standing for 8-10 hours at normal temperature after the reaction is finished, washing for 2-4 times by using absolute ethyl alcohol, and drying to constant weight under the condition of airflow after the reaction is finished.
2. The water-retaining and anti-caking dry-mixed mortar according to claim 1, wherein the cement is low-heat portland cement or medium-heat portland cement; the aggregate is one or a mixture of more of organic sand, river sand or crushed particles of construction waste, and the fineness of the aggregate is less than 2 mm.
3. The water-retaining anti-caking dry-mixed mortar according to claim 1, wherein the wood chips are poplar wood chips or locust tree wood chips.
4. The water-retaining anti-caking dry-mixed mortar as claimed in claim 1, wherein the stirring speed in step (2) is 1050-.
5. The water-retaining anti-caking dry-mixed mortar according to claim 1, wherein the air drying temperature in step (3) is 85-95 ℃.
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| CN201711149342.XA CN107721320B (en) | 2017-11-18 | 2017-11-18 | Water-retention anti-caking dry-mixed mortar |
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| CN102093021B (en) * | 2010-12-28 | 2013-05-22 | 济南丞华环保科技发展中心 | Slag micro-powder dry mixed mortar |
| CN105174852A (en) * | 2015-10-22 | 2015-12-23 | 福建江夏学院 | Recycled aggregate concrete and preparation method thereof |
| CN106747192B (en) * | 2016-12-16 | 2019-04-16 | 广州市盈坚建材科技发展有限公司 | A kind of wet mixing mortar and preparation method thereof of resistance to compression moisturizing |
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Effective date of registration: 20200310 Address after: 410100 Shigongwan Community, Huangxing Town, Changsha County, Changsha City, Hunan Province (No. 1 Workshop, Hunan Tongxinganshan Car Body Manufacturing Co., Ltd.) Applicant after: Changsha Sanshu New Material Technology Co., Ltd. Address before: 233000 Anhui Province, Bengbu City Industrial Park Road No. 60 Yu Yuhui District Applicant before: Anhui Province Shen Zhou building materials Science and Technology Ltd. |
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