CN104961423A - Machine-spraying-type plastering gypsum mortar and preparation technology thereof - Google Patents
Machine-spraying-type plastering gypsum mortar and preparation technology thereof Download PDFInfo
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Abstract
The invention relates to machine-spraying-type plastering gypsum and a preparation technology thereof and belongs to the technical field of building materials. The machine-spraying-type plastering gypsum is characterized by being prepared from the following raw materials: 200-400 parts of gypsum, 10-60 parts of cement, 520-650 parts of fine aggregate, 80-160 parts of heavy calcium powder, 2-4 parts of redispersible emulsion powder, 2-4 parts of hydroxypropyl methyl cellulose ether, 0.15-0.25 part of an air entraining agent, 5-10 parts of expanded perlite, 0.3-0.8 part of a gypsum retarder and 200-300 parts of water. The machine-spraying-type plastering gypsum is applicable to being directly sprayed to a wall surface by adopting a mortar spraying machine, both time and labour are saved, construction efficiency can be improved, and cost is reduced; bonding performance with the wall surface is good, rebounce is not caused, anti-sagging performance is good, both bonding strength and compressive strength can meet requirements, and cracking of a wall body can be reduced; and usage amount of gypsum is low, and cost can be effectively reduced.
Description
Technical field
The invention belongs to building material technical field, be specifically related to a kind of Novel machine spray plastering gupsum mortar.
Background technology
Gypsum motar is applied to inner wall of building, favorable working performance, shrinks little, not easy to crack, and has good hydrofuge and water absorbability, has the effect of surge chamber humidity.But in construction process, mainly plaster based on manual.Pure craft labour intensity of plastering is large, and efficiency is low, and construction quality is unstable, simultaneously due to cost of labor in recent years increase, professional bricklayer is in short supply, causes construction cost constantly to increase.Operating efficiency, from having introduced Mortar spraying machine abroad, can improve greatly with mechanically spraying gypsum mortar in China, reduce cost of labor, but common gypsum mortar is difficult to the performance meeting mechanically spraying.The present invention develops a kind of novel gypsum motar, is applicable to mechanized construction, has good workability and water-retentivity.
Zhengzhou Gong great building materials company limited discloses a kind of mechanical execution and to plaster special powder; mixed by Portland clinker, gypsum, granulated blast-furnace slag, flyash, limestone powder, chemical additive, chemical additive mainly comprise in ether of cellulose, dispersion agent, thickening material, air entrapment agent one or more.But this invention gypsum is as adjustable solidification agent, and content is few, moisture absorption hydrofuge and sound insulation and noise reduction effect poor, be not suitable for constructing to inner wall of building.
Changsha Hai Hong building materials company limited discloses a kind of gypsum base plastering mortar and preparation method thereof, this gypsum base plastering mortar comprises each component of following mass parts: gypsum 16.4%-19.5%, cement 5.9%-7.8%, sand 71.5%-76.1%, additive 1.3%-1.7%.Wherein said additive comprises emulsion and stablizer, and mass ratio is 4-6:1.In this invention, in additive, emulsion is liquid, and other are powder, cannot make dry-mix, not easily carries out mechanized construction; And Water-saving effect may not meet mechanically spraying construction.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of gypsum mortar of novel applicable mechanized construction is provided.This gypsum mortar is applicable to mechanical execution, can replace the constructional method of manually plastering at present, change the present situation that cost of labor is in the past high, operating efficiency is low, construction quality is unstable, liberate the productive forces, reach the object of fast and high quality construction, and can be that enterprise is cost-saving, increase economic benefit.
Concrete scheme of the present invention is:
A kind of Novel machine spray plastering gupsum mortar is mixed by powder, fine aggregate, additive and water.Powder comprises gypsum, cement, dicalcium powder; Fine aggregate is river sand; Admixture comprises hydroxypropyl methyl cellulose ether, redispersible rubber powder, air entrapment agent, pearlstone, calcium sulphate retarder.200 ~ 400 parts, gypsum, cement 10-60 part, fine aggregate 520-650 part, dicalcium powder 80-160 part, redispersible latex powder 2-4 part, hydroxypropyl methyl cellulose ether 2-4 part, air entrapment agent 0.15-0.25 part, pearlstone 5-10 part, calcium sulphate retarder 0.3-0.8 part, water 200-300 part.
Further, described gypsum is the plaster of paris or desulfurated plaster.
Further, described cement is 42.5 grades of high-strength quick setting and rapid hardening high belite sulfate cements.
Further, described fine aggregate is the river sand of fineness modulus 1.8-2.5.
Further, described hydroxypropyl methyl cellulose ether, viscosity is 5-15 ten thousand mPas.
Further, described air entrapment agent is rosin air entrapment agent, powdery.
Further, described pearlstone maximum particle diameter is less than 2.5mm.
Further, described calcium sulphate retarder is compound retardant.
Another object of the present invention there is provided the preparation method of machine spray plastering gupsum mortar.
Concrete preparation method, comprises the following steps:
(1) first redispersible latex powder, hydroxypropyl methyl cellulose ether, air entrapment agent, pearlstone, calcium sulphate retarder are mixed
(2) by measuring apparatus, accurately in mass ratio the additive mixed in the gypsum of drying, fine aggregate, dicalcium powder, cement and (1) is mixed.
(3) at the construction field (site), the dry-mixed mortar that (2) mix is added suitable quantity of water and stirs, make denseness in 80-100mm scope, namely obtaining can the gypsum mortar of mechanized construction.
Gypsum mortar of the present invention mainly solves the difficult problem that common gypsum mortar cannot meet mechanized construction.The present invention has multiple superiority in addition:
1. gypsum consumption is low, reduces the cost of mortar.
2. add a small amount of high-strength quick setting and rapid hardening high belite sulfate cement, for improving intensity.The double-quick cement selected, early strength is high, shrinks little, effectively can avoid cracking.
3. workability is good, easy pumping; Fall ash few, sag resistance is strong; Good with body of wall cohesiveness.
4. every mechanical property all meets the demands, and can see from example, and cohesive strength, folding strength, ultimate compression strength are all higher than the index required.
5. mechanize is plastered and is replaced manually plastering, and greatly can improve operating efficiency, the reduction of erection time, reduce construction cost.
6. working procedure is simple, and can not prewet to body of wall, direct spraying, effect is influenced hardly.
Realize the automatic arc spraying of gypsum mortar, mortar mortar is just necessarily required to have higher water-retentivity and viscosity, ether of cellulose and redispersible latex powder is added in this formula, hydroxypropyl methyl cellulose ether is a kind of water-holding agent and thickening material of excellent performance, mainly become hydrogen bond with Sauerstoffatom on ehter bond with associated water molecules by hydroxyl, free-water is made to become Bound moisture, prevent the too much too fast absorption moisture of base material and hinder the evaporation of moisture, when ensureing hydrated cementitious with this, there is enough water, reach the object of water conservation.Redispersible latex powder can increase the cohesiveness of mortar, increases thixotroping and anti-property of hanging down, and makes mortar spraying to not easily resilience and not easily fall slurry during metope.Contribute to improving the popularity of mortar adding of air entrapment agent in addition, reduce the wearing and tearing to spraying machine, and the weather resistance of mortar can be improved.
Embodiment
The present invention is further illustrated below by way of specific examples.But the detail of example is only limitted to explain the present invention, should not be construed as the restriction to technical scheme of the present invention.Example fine aggregate used is the river sand of fineness modulus 2.1.Described pearlstone maximum particle diameter is less than 2.5mm.
Example 1
Formula: plaster of paris 200g, 42.5 grades of high-strength quick setting and rapid hardening high belite sulfate cement 30g, river sand 650g, dicalcium powder 120g, Yi Laitai MP2050 type redispersible latex 2.75g, viscosity is the hydroxypropyl methyl cellulose ether 3g of 100,000 mPas, sodium abietate air entrapment agent 0.25g, pearlstone 5g, Linyi chin or cheek reaches the DH-B type calcium sulphate retarder 0.3g of Chemical Manufacture, water 200g.Described gypsum specific surface area is 300m
2/ kg; Described cement specific surface area is 350m
2/ kg.
Preparation process: redispersible latex powder, hydroxypropyl methyl cellulose ether, air entrapment agent, pearlstone, calcium sulphate retarder first carry out mixing the additive obtaining mixing by (1).
(2) by measuring apparatus, accurately in mass ratio the additive mixed in the gypsum of drying, fine aggregate, dicalcium powder, cement and (1) is mixed.
(3) dry-mixed mortar that (2) mix is added 210g water, namely obtaining can machine spray plastering gupsum mortar.
Check performance index of the present invention with reference to GB/T28627-2012 " plastering gupsum ".The detection data of example 1 machine spray gypsum motar performance are in table 1.By the mortar that this formula and preparation technology obtain, almost without bleeding, serviceability is good, and slurry has larger cohesiveness, and water retention is more than 98%.Folding strength, ultimate compression strength and tensile bond strength all meet the requirement of relevant criterion.
Table 1
| Test item | Unit | Performance index | Testing standard |
| Denseness | mm | 87 | GB/T28627-2012 |
| Time of coagulation | min | 65 | GB/T28627-2012 |
| Water retention | ％ | 98 | GB/T28627-2012 |
| 7d folding strength | MPa | 2.3 | GB/T28627-2012 |
| 7d ultimate compression strength | MPa | 4.83 | GB/T28627-2012 |
| 7d tensile bond strength | MPa | 0.53 | GB/T28627-2012 |
Example 2
Formula: plaster of paris 300g, 42.5 grades of high-strength quick setting and rapid hardening high belite sulfate cement 10g, river sand 550g, dicalcium powder 160g, Yi Laitai MP2050 type redispersible latex 4g, viscosity is the hydroxypropyl methyl cellulose ether 4g of 50,000 mPas, sodium abietate air entrapment agent 0.2g, pearlstone 10g, Linyi chin or cheek reaches the DH-B type calcium sulphate retarder 0.45g of Chemical Manufacture, water 266g.
Preparation process: redispersible latex powder, hydroxypropyl methyl cellulose ether, air entrapment agent, pearlstone, calcium sulphate retarder first carry out mixing the additive obtaining mixing by (1).
(2) by measuring apparatus, accurately in mass ratio the additive mixed in the gypsum of drying, fine aggregate, dicalcium powder, cement and (1) is mixed.
(3) dry-mixed mortar that (2) mix is added 266g water, namely obtaining can machine spray plastering gupsum mortar.
Check performance index of the present invention with reference to GB/T28627-2012 " plastering gupsum ".The detection data of example 2 machine spray gypsum motar performance are in table 2.By the mortar that this formula and preparation technology obtain, almost without bleeding, serviceability is good, and slurry has larger cohesiveness, and water retention is more than 96%.Folding strength, ultimate compression strength and tensile bond strength all meet the requirement of relevant criterion.
Table 2
| Test item | Unit | Performance index | Testing standard |
| Denseness | mm | 86 | GB/T28627-2012 |
| Time of coagulation | min | 84 | GB/T28627-2012 |
| Water retention | ％ | 96 | GB/T28627-2012 |
| 7d folding strength | MPa | 2.4 | GB/T28627-2012 |
| 7d ultimate compression strength | MPa | 4.65 | GB/T28627-2012 |
| 7d tensile bond strength | MPa | 0.54 | GB/T28627-2012 |
Example 3
Formula: desulfurated plaster 400g, 42.5 grades of high-strength quick setting and rapid hardening high belite sulfate cement 10g, river sand 520g, dicalcium powder 80g, Yi Laitai MP2050 type redispersible latex 4g, viscosity is the hydroxypropyl methyl cellulose ether 2g of 150,000 mPas, sodium abietate air entrapment agent 0.15g, pearlstone 5g, Linyi chin or cheek reaches the DH-B type calcium sulphate retarder 0.6g of Chemical Manufacture, water 300g.
Preparation process: redispersible latex powder, hydroxypropyl methyl cellulose ether, air entrapment agent, pearlstone, calcium sulphate retarder first carry out mixing the additive obtaining mixing by (1).
(2) by measuring apparatus, accurately in mass ratio the additive mixed in the gypsum of drying, fine aggregate, dicalcium powder, cement and (1) is mixed.
(3) dry-mixed mortar that (2) mix is added 300g water, namely obtaining can machine spray plastering gupsum mortar.
Check performance index of the present invention with reference to GB/T28627-2012 " plastering gupsum ".The detection data of example 3 machine spray gypsum motar performance are in table 3.By the mortar that this formula and preparation technology obtain, almost without bleeding, serviceability is good, and slurry has larger cohesiveness, and water retention is more than 99%.Folding strength, ultimate compression strength and tensile bond strength all meet the requirement of relevant criterion.
Table 3
| Test item | Unit | Performance index | Testing standard |
| Denseness | mm | 88 | GB/T28627-2012 |
| Time of coagulation | min | 86 | GB/T28627-2012 |
| Water retention | ％ | 99 | GB/T28627-2012 |
| 7d folding strength | MPa | 3.17 | GB/T28627-2012 |
| 7d ultimate compression strength | MPa | 5.55 | GB/T28627-2012 |
| 7d tensile bond strength | MPa | 0.48 | GB/T28627-2012 |
Example 4
Formula: desulfurated plaster 300g, 42.5 grades of high-strength quick setting and rapid hardening high belite sulfate cement 60g, river sand 540g, dicalcium powder 100g, Yi Laitai MP2050 type redispersible latex 2g, viscosity is the hydroxypropyl methyl cellulose ether 2g of 150,000 mPas, sodium abietate air entrapment agent 0.15g, pearlstone 8g, Linyi chin or cheek reaches the DH-B type calcium sulphate retarder 0.8g of Chemical Manufacture, water 280g.
Preparation process: redispersible latex powder, hydroxypropyl methyl cellulose ether, air entrapment agent, pearlstone, calcium sulphate retarder first carry out mixing the additive obtaining mixing by (1).
(2) by measuring apparatus, accurately in mass ratio the additive mixed in the gypsum of drying, fine aggregate, dicalcium powder, cement and (1) is mixed.
(3) dry-mixed mortar that (2) mix is added 280g water, namely obtaining can machine spray plastering gupsum mortar.
Check performance index of the present invention with reference to GB/T28627-2012 " plastering gupsum ".The detection data of example 4 machine spray gypsum motar performance are in table 4.By the mortar that this formula and preparation technology obtain, almost without bleeding, serviceability is good, and slurry has larger cohesiveness, and water retention is more than 99%.Folding strength, ultimate compression strength and tensile bond strength all meet the requirement of relevant criterion.
Table 4
| Test item | Unit | Performance index | Testing standard |
| Denseness | mm | 90 | GB/T28627-2012 |
| Time of coagulation | min | 95 | GB/T28627-2012 |
| Water retention | ％ | 99 | GB/T28627-2012 |
| 7d folding strength | MPa | 2.60 | GB/T28627-2012 |
| 7d ultimate compression strength | MPa | 4.85 | GB/T28627-2012 |
| 7d tensile bond strength | MPa | 0.52 | GB/T28627-2012 |
Claims (9)
1. a machine spray plastering gupsum mortar, it is characterized in that: the material comprising following mass fraction: 200 ~ 400 parts, gypsum, cement 10-60 part, fine aggregate 520-650 part, dicalcium powder 80-160 part, redispersible latex powder 2-4 part, hydroxypropyl methyl cellulose ether 2-4 part, air entrapment agent 0.15-0.25 part, pearlstone 5-10 part, calcium sulphate retarder 0.3-0.8 part, water 200-300 part.
2. a kind of machine spray plastering gupsum mortar according to claim 1, is characterized in that: described gypsum is the plaster of paris or desulfurated plaster.
3. a kind of machine spray plastering gupsum mortar according to claim 1, is characterized in that: described cement is 42.5 grades of high-strength quick setting and rapid hardening high belite sulfate cements.
4. a kind of machine spray plastering gupsum mortar according to claim 1, is characterized in that: described fine aggregate is the river sand of fineness modulus 1.8-2.5.
5. a kind of machine spray plastering gupsum mortar according to claim 1, it is characterized in that: described hydroxypropyl methyl cellulose ether, viscosity is 5-15 ten thousand mPas.
6. a kind of machine spray plastering gupsum mortar according to claim 1, is characterized in that: described air entrapment agent is rosin air entrapment agent, powdery.
7. a kind of machine spray plastering gupsum mortar according to claim 1, is characterized in that: described pearlstone maximum particle diameter is less than 2.5mm.
8. a kind of machine spray plastering gupsum mortar according to claim 1, is characterized in that: described calcium sulphate retarder is compound retardant.
9. the preparation technology of a kind of machine spray plastering gupsum mortar according to claim 1, is characterized in that, comprise the following steps:
(1) first redispersible latex, hydroxypropyl methyl cellulose ether, air entrapment agent, pearlstone, calcium sulphate retarder are carried out mixing the additive obtaining mixing;
(2) by measuring apparatus, accurately in mass ratio the additive mixed in the gypsum of drying, fine aggregate, dicalcium powder, cement and (1) is carried out mixing obtaining dry-mixed mortar;
(3) at the construction field (site), the dry-mixed mortar that (2) mix is added suitable quantity of water, make denseness in 80-100mm scope, namely obtaining can machine spray plastering gupsum mortar.
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Effective date of registration: 20210421 Address after: 831100 No.12, Changxiang Road, Changji high tech Industrial Development Zone, Changji Hui Autonomous Prefecture, Xinjiang Uygur Autonomous Region Patentee after: Xinjiang Ronggao Hongjun New Material Technology Co.,Ltd. Address before: 100124 Chaoyang District, Beijing Ping Park, No. 100 Patentee before: Beijing University of Technology |