CN110606711B - Machine-made sand dry-mixed plastering mortar - Google Patents
Machine-made sand dry-mixed plastering mortar Download PDFInfo
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- CN110606711B CN110606711B CN201910755945.7A CN201910755945A CN110606711B CN 110606711 B CN110606711 B CN 110606711B CN 201910755945 A CN201910755945 A CN 201910755945A CN 110606711 B CN110606711 B CN 110606711B
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses machine-made sand dry-mixed plastering mortar which is prepared from the following raw materials in parts by weight: 80-180 parts of PO42.5 cement; 50-150 parts of stone powder; 700 portions and 900 portions of mechanism sand; sodium alginate: 0.1-0.7 parts; 0.05-0.1 part of calcium formate; air entraining agent: 0.01-0.05 part. The invention adopts granite machine-made sand as the aggregate, avoids the damage of natural sand mining to the environment, adopts stone powder generated in the sand making process as the filler, effectively utilizes the tailings and can effectively reduce the cost. The invention adopts the sodium alginate composite calcium formate as the thickening agent of the plastering mortar, can greatly improve the water retention rate of the machine-made sand plastering mortar, ensures the construction lubricity of the mortar, and can make pumping and machine spraying more convenient and smooth especially for the current mechanical construction.
Description
Technical Field
The invention relates to the field of building mortar, in particular to machine-made sand dry-mixed plastering mortar.
Background
The existing plastering mortar usually adopts natural sand and fly ash as aggregate and filler, the exploitation of the natural sand can seriously damage the environment, along with the less and less stock of the natural sand, the nation gradually puts a ban on the exploitation of the limited natural sand in recent years, so that the natural sand is more and more difficult to be exploited, the cost is higher and higher, and in order to respond to the nation ban on the sand and control the production cost of the dry-mixed plastering mortar, the mechanical sand replaces the natural sand to be used as the aggregate of the common dry-mixed mortar, which is an irreversible trend in the future building mortar industry.
At present, cellulose and starch ether are generally added as an additive of dry-mixed plastering mortar in China to improve the construction performance of the plastering mortar. The machine-made sand replaces natural sand to serve as aggregate of the dry-mixed plastering mortar, so that a new problem is brought, and due to the fact that the machine-made sand is not round and smooth enough, hand feeling is dry and difficult to smear when workers scrape the plaster, and hollowing is easily caused; and the problems of difficult transportation, easy pipe blockage and the like can also occur during mechanical construction. The situations can not be well improved by adding cellulose and starch ether, and in order to solve the problem of difficult construction of the machine-made sand, the invention adopts the sodium alginate composite calcium formate as the thickening agent of the plastering mortar for the first time, so that the problem of difficult construction of the machine-made sand plastering mortar can be well improved.
Sodium alginate is a byproduct after extracting iodine and mannitol from brown algae such as kelp or gulfweed, and its molecules are connected by a (1 → 4) bond between beta-D-mannuronic acid (M) and alpha-L-guluronic acid (alpha-L-guluronic acid, G). The sodium alginate aqueous solution has high viscosity, and can be used as thickener, stabilizer, emulsifier, etc. of food. Sodium alginate can form gel rapidly under extremely mild conditions, and Ca is available2+、Sr2+Na on G unit in the presence of an isocation+And carrying out ion exchange reaction with divalent cations, and stacking the G units to form a cross-linked network structure, thereby forming the hydrogel. The sodium alginate has good thickening property and good fluidity, and can greatly improve the water retention rate of the machine-made sand plastering mortar after being added, ensure the construction lubricity of the mortar, obviously reduce the consistency loss rate of the mortar and ensure the operable time of the mortar. The sodium alginate composite calcium formate can promote the hydration degree of the cementing material in the mortar and improve the bonding strength of the mortar.
The invention patent application 'a machine-made sand thermal mortar' (publication No. CN102010162B) also adopts granite machine-made sand as the mortar, but is a thermal mortar rather than plastering mortar. Therefore, reports of dry-mixed plastering mortar of granite machine-made sand combined with sodium alginate and calcium formate are not seen at present.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the machine-made sand dry-mixed plastering mortar, wherein sodium diatomate composite calcium formate is used as a thickening agent of the machine-made sand dry-mixed plastering mortar for the first time, and the problem of poor construction performance of the machine-made sand is solved by utilizing good thickening property and flowing energy of the sodium diatomate, so that the construction efficiency and the construction quality can be effectively improved. In order to solve the above problems, the present invention provides the following technical solutions: a machine-made sand dry-mixed plastering mortar is composed of the following raw materials in parts by weight: 80-180 parts of PO42.5 cement; 50-150 parts of stone powder; 700 portions and 900 portions of mechanism sand; sodium alginate: 0.1-0.7 parts; 0.05-0.1 part of calcium formate; air entraining agent: 0.01-0.05 part.
Further, the machine-made sand dry-mixed plastering mortar is mainly composed of the following raw materials in parts by weight: PO42.5 cement of 100 portions and 160 portions; 80-120 parts of stone powder; 790 parts of mechanism sand and 850 parts of mechanism sand; sodium alginate: 0.2-0.4 part; 0.06-0.08 part of calcium formate; air entraining agent: 0.01 to 0.02 portion.
Further, the machine-made sand dry-mixed plastering mortar is mainly composed of the following raw materials in parts by weight: 120 parts of PO42.5 cement; 100 parts of stone powder; 820 parts of machine-made sand; sodium alginate: 0.3 part; 0.07 part of calcium formate; air entraining agent: 0.015 parts.
Furthermore, the machine-made sand adopted by the invention is granite machine-made sand, the fineness modulus is 2.0-2.4, the maximum particle size is less than 4.75mm, the grading of the sand meets the grading 2 standard of the machine-made sand in GB/T14684 plus 2011 building sand, the content of stone powder in the machine-made sand is not more than 10 wt%, and the water content is less than 0.5 wt%.
Furthermore, the stone powder adopted by the invention is derived from stone powder generated in the sand making process, and the fineness of the stone powder is less than 0.075 mm.
Furthermore, the sodium alginate of the invention is a by-product after iodine and mannitol are extracted from kelp or gulfweed of brown algae, is natural polysaccharide, is light yellow powder, and has a molecular formula of (C)6H7O6Na)nThe sodium alginate of the invention belongs to industrial grade sodium alginate.
Furthermore, the molecular formula of the calcium formate is C2H204Ca, white powder.
According to the machine-made sand dry-mixed plastering mortar, the machine-made sand and the stone powder are used for replacing natural sand and fly ash to serve as the aggregate and the filler, so that the environment is protected, the production cost is greatly saved, the sodium alginate composite calcium formate is used as a thickening agent of the machine-made sand plastering mortar, the construction lubricity of the mortar is obviously improved, and the construction efficiency and the construction quality are improved.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to examples.
The raw material manufacturers used in the tests of the invention were as follows:
P.O 42.5.5 Portland Cement: hainan Huasheng Skyline Cement Co., Ltd;
stone powder: hainan Taihe technologies, Inc.;
and (3) machining sand: hainan Taihe science and technology Co Ltd
Sodium alginate: qingdao Nanshan Biotech Co., Ltd;
calcium formate: guangzhou Longhu science and technology;
air entraining agent: guangzhou Longhu science and technology.
Example 1
A machine-made sand dry-mixed plastering mortar is composed of the following raw materials in parts by weight: 80 parts of PO42.5 cement; 50 parts of stone powder; 700 parts of machine-made sand; sodium alginate: 0.1 part; 0.05 part of calcium formate; air entraining agent: 0.01 part.
The fineness modulus of the machine-made sand is 2.0-2.4, the maximum grain diameter is less than 4.75mm, the gradation of the sand meets the standard of the gradation 2 area of the machine-made sand in GB/T14684-2011 construction sand, the content of the stone powder is not higher than 10 percent, and the water content is less than 0.5 percent.
Example 2
A machine-made sand dry-mixed plastering mortar is composed of the following raw materials in parts by weight: 180 parts of PO42.5 cement; 150 parts of stone powder; 900 parts of machine-made sand; sodium alginate: 0.7 part; 0.1 part of calcium formate; air entraining agent: 0.05 part.
The fineness modulus of the machine-made sand is 2.1-2.3, the maximum particle size is less than 4.75mm, the gradation of the sand meets the standard of the gradation 2 area of the machine-made sand in GB/T14684-plus 2011 "construction sand", the content of the stone powder is not higher than 7%, and the water content is less than 0.5%.
Example 3
A machine-made sand dry-mixed plastering mortar is composed of the following raw materials in parts by weight: 120 parts of PO42.5 cement; 100 parts of stone powder; 820 parts of machine-made sand; sodium alginate: 0.3 part; 0.07 part of calcium formate; air entraining agent: 0.015 parts.
The fineness modulus of the machine-made sand is 2.2, the maximum particle size is less than 4.75mm, the grading of the sand meets the grading 2 standard of machine-made sand in GB/T14684-plus 2011 construction sand, the content of stone powder is not higher than 5 percent, and the water content is less than 0.5 percent.
While the above detailed description of the preferred embodiment of the present invention and the mechanical sand requirements do not limit the scope of the invention to the embodiments described, it will be appreciated by those skilled in the art that various modifications can be made to the embodiments without departing from the spirit of the invention
Compared with plastering mortar prepared by using natural sand and fly ash as aggregate and filler, the machine-made sand dry-mixed plastering mortar has lower production cost, and the production cost of each ton of plastering mortar can be saved by about 80-100 yuan (by taking 180 yuan/ton of natural sand, 100 yuan/ton of fly ash, 130 yuan/ton of machine-made sand and 80 yuan/ton of stone powder as comparison).
The machine-made sand dry-mixed plastering mortar prepared in the embodiments 1, 2 and 3 is used as a detection object, the mixture ratio of reference 1, reference 2 and reference 3 in the table 1 is used as a comparison formula, the basic performance and construction efficiency test method of each formula is analyzed and checked according to JGJ/T70-2009 building mortar basic performance test method standard, the performance is in accordance with the related standard of GB/T25181-2010 premixed mortar, and the results are as follows:
TABLE 1 comparative formulation
| Reference 1 | Reference 2 | Reference 3 | |
| PO42.5 Cement/g | 80 | 180 | 120 |
| Stone powder/g | 50 | 150 | 100 |
| Machine-made sand/g | 700 | 900 | 820 |
| Cellulose/g | 0.1 | 0.7 | 0.3 |
| Starch ether/g | 0.05 | 0.1 | 0.07 |
| Air entraining agent/g | 0.01 | 0.05 | 0.015 |
| Water/g | 140 | 170 | 150 |
TABLE 2 comparison of basic Properties
TABLE 3 comparison of workability
| Reference 1 | Reference 2 | Reference 3 | Example 1 | Example 2 | Example 3 | |
| Area/day of artificial construction | 35 | 35 | 35 | 40 | 40 | 40 |
| Construction area/h of mechanical spraying | 60 | 63 | 65 | 79 | 80 | 84 |
Compared with the dry-mixed plastering mortar prepared by using natural sand and fly ash as aggregates and fillers, the machine-made sand dry-mixed plastering mortar has the advantages that the production cost is lower, the production cost of each ton of plastering mortar can be saved by about 80-100 yuan, the exploitation of natural sand is avoided, and the environment can be better protected. Sodium alginate composite calcium formate is used for replacing cellulose and starchThe ether is used as a thickening agent of the machine-made sand dry-mixed plastering mortar, the water retention rate of the wet-mixed mortar is improved, the loss rate of the consistency of 2 hours is reduced, the setting time is prolonged, and the performances are changed, so that the operable time of the mortar during construction is prolonged; meanwhile, the 14d tensile bonding strength and 28d compressive strength of the hardened mortar are improved, and the 28d shrinkage rate and freezing resistance are reduced, and the change of the properties indicates that the hydration degree of the hardened mortar is more complete; in the aspect of construction efficiency, when workers manually plaster, the construction area per day is increased by 5m2(ii) a The mechanical construction becomes more stable and smooth, and the area sprayed at each small occasion is increased by 20m2And the left and the right show that the construction efficiency is obviously improved.
Claims (5)
1. The machine-made sand dry-mixed plastering mortar is characterized in that: the composition comprises the following raw materials in parts by weight: 80-180 parts of PO42.5 cement; 50-150 parts of stone powder; 700 portions and 900 portions of mechanism sand; sodium alginate: 0.1-0.7 parts; 0.05-0.1 part of calcium formate; air entraining agent: 0.01-0.05 part.
2. The machine-made sand dry-mixed plastering mortar of claim 1, which is characterized by comprising the following components in parts by weight: PO42.5 cement of 100 portions and 160 portions; 80-120 parts of stone powder; 790 parts of mechanism sand and 850 parts of mechanism sand; sodium alginate: 0.2-0.4 part; 0.06-0.08 part of calcium formate; air entraining agent: 0.01 to 0.02 portion.
3. The machine-made sand dry-mixed plastering mortar of claim 1, which is characterized by comprising the following components in parts by weight: 120 parts of PO42.5 cement; 100 parts of stone powder; 820 parts of machine-made sand; sodium alginate: 0.3 part; 0.07 part of calcium formate; air entraining agent: 0.015 parts.
4. The machine-made sand dry-mixed plastering mortar of claim 1, wherein the machine-made sand is granite machine-made sand, the fineness modulus is 2.0-2.4, the maximum particle size is less than 4.75mm, the content of stone powder in the machine-made sand is not higher than 10 wt%, and the water content is less than 0.5 wt%.
5. The machine-made sand dry-mixed plastering mortar of claim 4, wherein the stone powder is produced in the sand making process, and the fineness of the stone powder is less than 0.075 mm.
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| CN115477506A (en) * | 2022-07-25 | 2022-12-16 | 马鞍山市申锐节能新材料有限公司 | Thermal insulation mortar with high crack resistance and preparation method thereof |
| CN115536346B (en) * | 2022-12-02 | 2023-06-06 | 湖南大学 | Water-based zero-VOCs micro-nano environment-friendly facing mortar and preparation method and application thereof |
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| CN102010162A (en) * | 2010-11-09 | 2011-04-13 | 中泰（福建）混凝土发展有限公司 | Heat-preservation mortar prepared from machine-made sand |
| CN106904914A (en) * | 2017-04-05 | 2017-06-30 | 杭州墨泰科技股份有限公司 | A kind of machine spray drying mixed plastering mortar |
| CN107298556A (en) * | 2017-05-19 | 2017-10-27 | 上海漕源新型建材有限公司 | A kind of flyash dry-mixed plastering mortar and preparation method thereof |
| CN108947379A (en) * | 2018-08-21 | 2018-12-07 | 张玉英 | A kind of durability concrete and preparation method |
| CN109970409A (en) * | 2019-03-18 | 2019-07-05 | 北京国旺混凝土有限公司 | A kind of commerical ready-mixed concrete and preparation method thereof of high intensity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5315525B2 (en) * | 1973-05-29 | 1978-05-25 |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010162A (en) * | 2010-11-09 | 2011-04-13 | 中泰（福建）混凝土发展有限公司 | Heat-preservation mortar prepared from machine-made sand |
| CN106904914A (en) * | 2017-04-05 | 2017-06-30 | 杭州墨泰科技股份有限公司 | A kind of machine spray drying mixed plastering mortar |
| CN107298556A (en) * | 2017-05-19 | 2017-10-27 | 上海漕源新型建材有限公司 | A kind of flyash dry-mixed plastering mortar and preparation method thereof |
| CN108947379A (en) * | 2018-08-21 | 2018-12-07 | 张玉英 | A kind of durability concrete and preparation method |
| CN109970409A (en) * | 2019-03-18 | 2019-07-05 | 北京国旺混凝土有限公司 | A kind of commerical ready-mixed concrete and preparation method thereof of high intensity |
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