CN115677290A - Anti-cracking and anti-cracking plastering mortar and preparation method thereof - Google Patents
Anti-cracking and anti-cracking plastering mortar and preparation method thereof Download PDFInfo
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- CN115677290A CN115677290A CN202211321377.8A CN202211321377A CN115677290A CN 115677290 A CN115677290 A CN 115677290A CN 202211321377 A CN202211321377 A CN 202211321377A CN 115677290 A CN115677290 A CN 115677290A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention belongs to the technical field of building mortar, and particularly relates to anti-cracking and anti-cracking plastering mortar and a preparation method thereof, wherein the mortar comprises the following raw materials in parts by weight: 120-180 parts of cement; 120-180 parts of slag powder; 80-120 parts of fly ash; 20-100 parts of red brick powder; 600-850 parts of sand; 400-750 parts of stone chips; 1-10 parts of organic resin; 100 to 300 portions of water. According to the invention, the cement, the slag powder and the fly ash are used for bonding the sand and the stone chips in the mortar, so that the strength is improved, the sand and the stone chips are used for supporting a mortar structure, the organic resin can fill the mortar gap, the red brick powder is used for absorbing water, and when the water is evaporated after the mortar is solidified, the water absorbed by the red brick powder is released to supplement the water evaporated on the surface of the mortar, so that the water in the mortar is supplemented, the shrinkage of the mortar is effectively prevented, and the anti-cracking and anti-cracking effects are achieved.
Description
Technical Field
The invention relates to the technical field of building mortar, in particular to anti-cracking and anti-cracking plastering mortar and a preparation method thereof.
Background
The plastering mortar is a kind of building mortar which is coated on the building surface to achieve leveling or meet the requirements of decoration, and the dry-mixed plastering mortar is obtained by weighing and mixing cement as a main binding base material, river sand, an admixture, an additive and the like, and can be used only by adding water in a construction site and then stirring. With the advance and development of basic level construction and urbanization construction, the demand of plastering mortar used in building finishing projects is increasing, the plastering mortar is a general name of mortar which is applied to the building base surface to level or provide protection, and is suitable for the decoration of inner and outer walls, cover surfaces, bottom surfaces, ceiling plasters and the like of buildings and finishing projects, and has the functions of protection and beautification.
201811336488.X discloses a polymer anti-cracking dry powder plastering mortar, which comprises, by mass, 55-65 parts of portland cement, 25-35 parts of high-alumina cement, 13-17 parts of gypsum, 110-120 parts of fly ash, 720-750 parts of sand, 0.1-0.15 part of a thickening agent, 0.7-1.3 parts of fiber, 23-27 parts of polymer emulsion powder, 0.1-0.2 part of a thixotropic agent, 23-27 parts of a thixotropic lubricant and 0.7-1.3 parts of a water reducing agent. The main problems are two, firstly, the main mineral composition of the high alumina cement is monocalcium aluminate CA and dicalcium aluminate CA 2 The hydration reaction of the water first generates CAH 10 、C 2 AH 8 These two unstable crystals are then transformed into stable C3AH6 crystals, the transformation of the crystal form leading to increased porosity and reduced strength, i.e. high aluminumThe durability of cement hydration products is poor; in ternary systems of portland cement, high-alumina cement and gypsum, although the main hydration product of the high-alumina cement is ettringite AFt, the stability of the system (especially in a high-alkali environment) is still poor, and the stability and the crack resistance of mortar prepared from the high-alumina cement are also poor. Secondly, the polymer emulsion powder is mainly acrylate, and can be redispersed into emulsion when meeting water after being prepared into mortar, and because the acrylate colloidal particles in the emulsion are large (generally in micron order) and are difficult to migrate with water, the polymer emulsion powder can play a certain role in cracking resistance and reinforcement after forming a film only when the mixing amount is high (23-27 parts); therefore, the mortar prepared from the mortar has high cost and is not suitable for basic layer plastering and leveling of general ceramic tile finishing engineering.
CN201810780749.0 discloses a special repair mortar for a structure and a preparation method thereof, wherein the repair mortar comprises the following components in parts by weight: 350-500 parts of ordinary portland cement; 50-150 parts of sulphoaluminate cement; 20-40 meshes of 100-200 parts of quartz sand; 300-350 parts of 41-70 meshes of quartz sand; 20-50 parts of montmorillonite; 30-50 parts of butylbenzene emulsion; 1-10 parts of redispersible latex powder; 1-5 parts of starch ether; 1-5 parts of cellulose ether; 0.5-2 parts of a polycarboxylic acid water reducing agent; 1-3 parts of retarder; 1-10 parts of fiber; 1-5 parts of composite early strength agent. Has higher mechanical properties such as bonding strength, tensile strength, compression strength and the like. The main problems are as follows: firstly, the cement content is too high, which causes the mortar to shrink greatly and crack easily. Secondly, the quartz sand is too fine to be plastered in thick layer, and has high cost and easy cracking. Thirdly, the styrene-butadiene emulsion and the redispersible emulsion powder are used, and the redispersible emulsion powder can be redispersed into emulsion after meeting water, and the emulsion particles are large (generally in micron order) and difficult to migrate with water, so that the emulsion particles are likely to have the functions of cracking resistance and strengthening after forming a film only when the mixing amount is high (31-60 parts); therefore, the mortar prepared from the mortar has high cost and is not suitable for basic layer plastering and leveling of general ceramic tile finishing engineering.
CN201310028190.3 provides a quick repair mortar for a plate-type ballastless track filling layer, and according to parts by mass, the quick repair mortar for the ballastless track filling layer comprises: 0.95 to 0.99 portion of cement; 0.01 to 0.05 portion of mixed material; 0.35-1.4 parts of polymer emulsion; 1.5-2 parts of sand; 0-0.3 part of water; 0.0004 to 0.01 portion of defoaming agent; 0.0001 to 0.003 portion of gas former; 0.0005 to 0.01 portion of air entraining agent; 0.001-0.005 part of a coagulation regulator; 0-0.02 part of water reducing agent; 0-0.001 part of rheological modifier; wherein the cement is quick-hardening sulphoaluminate cement. Because the cement is quick-hardening sulphoaluminate cement, the setting and hardening are quick, and the cement is only suitable for quick rush repair engineering; and because of using a large amount of polymer emulsion, the cost is high, so the method is not suitable for base layer plastering and leveling of general ceramic tile finishing engineering.
CN202010826517.1 provides waterproof and anti-permeability repair mortar, which comprises the following raw materials in percentage by weight: 20 to 30 percent of sulphoaluminate cement, 1 to 5 percent of fly ash, 0.5 to 3 percent of silica fume, 0.1 to 0.5 percent of polyvinyl alcohol rubber powder, 0.1 to 0.3 percent of water reducing agent, 0.05 to 0.2 percent of defoaming agent, 0.05 to 0.2 percent of retarder, 10 to 15 percent of water and 60 to 70 percent of river sand. Has high adhesive strength and high permeation pressure resistance. Because the cement is sulphoaluminate cement, the setting and hardening are fast, and the cement is only suitable for repair projects with small areas; because the water-retaining agent is not used, the water-retaining agent is not suitable for large-area use; because of using more polyvinyl alcohol glue powder, the cost is higher, so the comprehensive performance is not suitable for basic plastering and leveling of general ceramic tile facing engineering.
Disclosure of Invention
According to the invention, cement, slag powder and fly ash are arranged in the mortar to play roles in adhering sand and stone chips and improving strength, the sand and the stone chips play roles in supporting a mortar structure, organic resin plays a role in filling gaps of the mortar, the red brick powder loose porous structure is used for absorbing water, after the red brick powder is added into the mortar, when the water is evaporated after the mortar is solidified, the water adsorbed by the red brick powder is released, the water evaporated on the surface of the mortar is supplemented, the water in the mortar is supplemented, the shrinkage of the mortar is effectively prevented, and the crack resistance and cracking prevention effects are achieved.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides anti-cracking and anti-cracking plastering mortar which comprises the following raw materials in parts by weight: 120-180 parts of cement; 120-180 parts of slag powder; 80-120 parts of fly ash; 20-100 parts of red brick powder; 600-850 parts of sand; 400-750 parts of stone chips; 1-10 parts of organic resin; 100 to 300 portions of water.
By adopting the technical scheme, cement, slag powder and fly ash play roles in bonding sand and stone chips and improving strength in mortar, the sand and the stone chips play roles in supporting a mortar structure, the red brick powder is a loose and porous powder material, and the organic resin plays a role in filling gaps of the mortar; through setting up red brick powder, utilize the loose porous structure of red brick powder to absorb moisture content, normal mortar plasters the back on the wall and accomplishes, because the evaporation of moisture can arouse the shrink fracture of slurry, after adding red brick powder in the mortar, when the mortar solidifies the back moisture evaporation, the adsorbed moisture of red brick powder can release, and the moisture that supplyes mortar surface evaporation, the moisture that makes in the mortar obtains supplementally, the effectual shrink that prevents the mortar plays anti-cracking's effect.
Preferably, the feed comprises the following raw materials in parts by weight: 145-155 parts of cement; 145-155 parts of slag powder; 95-105 parts of fly ash; 25-35 parts of red brick powder; 700-800 parts of sand; 500-600 parts of stone chips; 4-6 parts of organic resin; 188-205 parts of water.
Preferably, the feed comprises the following raw materials in parts by weight: 150 parts of cement; 150 parts of slag powder; 100 parts of fly ash; 30 parts of red brick powder; 750 parts of sand; 550 parts of stone chips; 5 parts of organic resin; 190 parts of water.
Preferably, the cement is p.o42.5 cement.
Preferably, the sand is medium sand, the particle size of the sand is less than 4.75mm, and the mud content is not more than 5%.
Preferably, the anti-cracking and anti-cracking plastering mortar has a water retention rate of more than or equal to 99.0%, a compressive strength of more than or equal to 10.0MPa, a tensile bonding strength of more than or equal to 0.35MPa, a shrinkage rate of less than or equal to 0.2%, a freezing resistance strength loss rate of less than or equal to 25% and a freezing resistance property loss rate of less than or equal to 5% according to a standard JGJ/T70 test; the crack resistance of the crack-resistant plastering mortar with the thickness of 20mm is crack-free according to the test of the standard JC/T951.
The invention also provides a preparation method of the anti-cracking and anti-cracking plastering mortar, which comprises the following steps: weighing raw material components according to a ratio, firstly mixing and stirring cement, slag powder, fly ash, sand and stone chips for 1-3 min in advance, then stirring and mixing organic resin, water and red brick powder for 3-7 min to obtain the plastering mortar.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention relates to an anti-cracking and anti-cracking plastering mortar and a preparation method thereof.A cement, slag powder and fly ash are arranged in the mortar to play a role in bonding sand and stone chips, so that the strength is improved, the sand and the stone chips play a role in supporting a mortar structure, and organic resin plays a role in filling gaps in the mortar;
(2) The invention relates to anti-cracking and anti-cracking plastering mortar and a preparation method thereof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides anti-cracking and anti-cracking plastering mortar which comprises the following raw materials in parts by weight: 150 parts of cement; 150 parts of slag powder; 100 parts of fly ash; 30 parts of red brick powder; 750 parts of sand; 550 parts of stone chips; 5 parts of organic resin; 190 parts of water.
The invention provides a preparation method of the anti-cracking and anti-cracking plastering mortar, which comprises the following steps: weighing the raw material components according to the proportion, firstly mixing and stirring cement, slag powder, fly ash, sand and stone chips for 2min in advance, then mixing organic resin, water and red brick powder, stirring and mixing for 4min to obtain the plastering mortar.
Example 2
The invention provides anti-cracking and anti-cracking plastering mortar which comprises the following raw materials in parts by weight: 150 parts of cement; 150 parts of slag powder; 100 parts of fly ash; 40 parts of red brick powder; 750 parts of sand; 545 parts of stone chips; 5 parts of organic resin; 194 parts of water.
The invention provides a preparation method of the anti-cracking and anti-cracking plastering mortar, which comprises the following steps: weighing the raw material components according to the proportion, firstly mixing and stirring cement, slag powder, fly ash, sand and stone chips for 2min in advance, then mixing organic resin, water and red brick powder, stirring and mixing for 4min to obtain the plastering mortar.
Example 3
The invention provides anti-cracking and anti-cracking plastering mortar which comprises the following raw materials in parts by weight: 150 parts of cement; 150 parts of slag powder; 100 parts of fly ash; 50 parts of red brick powder; 750 parts of sand; 540 parts of stone chips; 5 parts of organic resin; 197 parts of water.
The invention provides a preparation method of the anti-cracking and anti-cracking plastering mortar, which comprises the following steps: weighing the raw material components according to the proportion, firstly mixing and stirring cement, slag powder, fly ash, sand and stone chips for 2min in advance, then mixing organic resin, water and red brick powder, stirring and mixing for 5min to obtain the plastering mortar.
Example 4
The invention provides anti-cracking and anti-cracking plastering mortar which comprises the following raw materials in parts by weight: 150 parts of cement; 150 parts of slag powder; 100 parts of fly ash; 60 parts of red brick powder; 750 parts of sand; 535 parts of stone chips; 5 parts of organic resin; 198 parts of water.
The invention provides a preparation method of the anti-cracking and anti-cracking plastering mortar, which comprises the following steps: weighing the raw material components according to the proportion, firstly mixing and stirring cement, slag powder, fly ash, sand and stone chips for 2min in advance, then mixing organic resin, water and red brick powder, stirring and mixing for 5min to obtain the plastering mortar.
Example 5
The invention provides anti-cracking and anti-cracking plastering mortar which comprises the following raw materials in parts by weight: 150 parts of cement; 150 parts of slag powder; 100 parts of fly ash; 70 parts of red brick powder; 750 parts of sand; 530 parts of stone chips; 5 parts of organic resin; 200 parts of water.
The invention provides a preparation method of the anti-cracking and anti-cracking plastering mortar, which comprises the following steps: weighing the raw material components according to the proportion, firstly mixing and stirring cement, slag powder, fly ash, sand and stone chips for 1-3 min in advance, then stirring the mixture into organic resin, water and red brick powder, and stirring and mixing the mixture for 3-7 min to obtain the plastering mortar.
Comparative example 1
The difference between the plastering mortar and the embodiment 1 is that red brick powder is not added.
Comparative example 2
The difference between the plastering mortar and the embodiment 1 is that the organic resin is replaced by cement and water which are mixed according to the proportion of 3:2.
Comparative example 3
The difference between the anti-cracking and anti-cracking plastering mortar and the embodiment 1 is that the slag powder and the fly ash are replaced by mixing cement and water according to the proportion of 3:2.
Performance test
Normal temperature crack resistance: the cracking indexes (mm) of the plastering mortars of examples 1-5 and comparative examples 1-3 are detected by using JC/T951-2005 'test method for cracking resistance of cement mortar'; 180-320
High temperature expansion performance: the coefficient of expansion (x 10) at 200 ℃ of the plastering mortar layers of examples 1 to 5 and comparative examples 1 to 3 was measured by the test method in the study on the thermal expansion Property of Cement concrete Material -6 /℃)；
Water retention: JGJ/T70-2009 mortar basic performance test method-mortar water retention test is adopted to detect the water retention (%) of the plastering mortar layers of examples 1-5 and comparative examples 1-3;
tensile bond strength: the tensile bonding strength (MPa) of the plastering mortar of examples 1-5 and comparative examples 1-3 is detected by JC/T2384-2016 (phenolic aldehyde board bonding and plastering mortar for external thermal insulation of external walls); 1.09-1.15MPa
And (3) judging the appearance performance of the high-temperature test: preparing plastering mortar samples of examples 1-5 and comparative examples 1-3, respectively coating the plastering mortar samples on the surfaces of 17 face bricks, curing, putting the face bricks coated with the plastering mortar into a high-temperature furnace, controlling the temperature system to be 200 ℃, baking for 10 hours, observing the surface phenomenon of the plastering mortar on the surface of the face bricks after the test, and judging the appearance grade according to the following 4 standards:
1. the surface is smooth, no crack, no bulge and no peeling;
2. slight surface crack, no bulge and peeling;
3. a small amount of cracks on the surface, no bulge and slight peeling;
4. a large number of cracks, bulges and cracks on the surface.
TABLE 1 summary of test data for examples 1-5 and comparative examples 1-3
According to the comparison of the test data of the example 1 and the comparative example 1 in the table 1, the red brick powder is added into the mortar, the red brick powder is used for absorbing water by utilizing a loose and porous structure of the red brick powder, and after the red brick powder is added into the mortar, when the water is evaporated after the mortar is solidified, the water absorbed by the red brick powder is released, and the water evaporated on the surface of the mortar is supplemented, so that the water in the mortar is supplemented, the shrinkage of the mortar is effectively prevented, and the anti-cracking and anti-cracking effects are achieved.
As can be seen from a comparison of the test data of example 1 and comparative example 2 in Table 1, the organic resin functions to fill the voids of the mortar.
According to the comparison of the test data of the example 1 and the comparative example 3 in the table 1, the cement, the slag powder and the fly ash are arranged in the mortar to play a role in bonding sand and stone chips, so that the strength is improved, and the sand and the stone chips play a role in supporting the mortar structure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The anti-cracking and anti-cracking plastering mortar is characterized by comprising the following raw materials in parts by weight: 120-180 parts of cement; 120-180 parts of slag powder; 80-120 parts of fly ash; 20-100 parts of red brick powder; 600-850 parts of sand; 400-750 parts of stone chips; 1-10 parts of organic resin; 100 to 300 portions of water.
2. The anti-cracking and anti-cracking plastering mortar as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight: 145-155 parts of cement; 145-155 parts of slag powder; 95-105 parts of fly ash; 25-35 parts of red brick powder; 700-800 parts of sand; 500-600 parts of stone chips; 4-6 parts of organic resin; 188-205 parts of water.
3. The anti-cracking and anti-cracking plastering mortar as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight: 150 parts of cement; 150 parts of slag powder; 100 parts of fly ash; 30 parts of red brick powder; 750 parts of sand; 550 parts of stone chips; 5 parts of organic resin; 190 parts of water.
4. An anti-cracking and anti-cracking plastering mortar according to claim 1, wherein the cement is P.O42.5 cement.
5. The plastering mortar with the functions of preventing cracking and resisting cracking as claimed in claim 1, wherein the sand is medium sand, the particle size of the medium sand is less than 4.75mm, and the mud content is not more than 5%.
6. The anti-cracking and anti-cracking plastering mortar of claim 1, wherein the anti-cracking and anti-cracking plastering mortar has a water retention rate of more than or equal to 99.0%, a compressive strength of more than or equal to 10.0MPa, a tensile bonding strength of more than or equal to 0.35MPa, a shrinkage rate of less than or equal to 0.2%, a freezing resistance loss rate of less than or equal to 25%, and a freezing resistance loss rate of less than or equal to 5% in accordance with a standard JGJ/T70 test; the crack resistance of the crack-resistant plastering mortar with the thickness of 20mm is crack-free according to the test of the standard JC/T951.
7. A preparation method of the anti-cracking and anti-cracking plastering mortar as claimed in claims 1 to 6, which is characterized by comprising the following steps: weighing the raw material components according to the proportion, firstly mixing and stirring cement, slag powder, fly ash, sand and stone chips for 1-3 min in advance, then stirring the mixture into organic resin, water and red brick powder, and stirring and mixing the mixture for 3-7 min to obtain the plastering mortar.
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| CN202211321377.8A CN115677290A (en) | 2022-10-26 | 2022-10-26 | Anti-cracking and anti-cracking plastering mortar and preparation method thereof |
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| CN202211321377.8A CN115677290A (en) | 2022-10-26 | 2022-10-26 | Anti-cracking and anti-cracking plastering mortar and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117550841A (en) * | 2023-11-15 | 2024-02-13 | 深圳大学 | Low-shrinkage geopolymer mortar, preparation method and application thereof, and low-shrinkage geopolymer curing mortar |
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2022
- 2022-10-26 CN CN202211321377.8A patent/CN115677290A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117550841A (en) * | 2023-11-15 | 2024-02-13 | 深圳大学 | Low-shrinkage geopolymer mortar, preparation method and application thereof, and low-shrinkage geopolymer curing mortar |
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