CN114315265B - Anti-crack mortar and preparation method and application thereof - Google Patents
Anti-crack mortar and preparation method and application thereof Download PDFInfo
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- CN114315265B CN114315265B CN202111488842.2A CN202111488842A CN114315265B CN 114315265 B CN114315265 B CN 114315265B CN 202111488842 A CN202111488842 A CN 202111488842A CN 114315265 B CN114315265 B CN 114315265B
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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
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses anti-crack mortar and a preparation method and application thereof. The anti-crack mortar comprises the following components in parts by mass: waste brick powder: 25-45 parts of a stabilizer; cement: 15-25 parts; reclaimed sand: 65-80 parts; activity excitant: 0 to 8 portions; fiber: 0 to 6 parts; redispersible latex powder: 1-5 parts; cellulose ether: 0.006 to 0.018 portions; water: 20 to 40 portions. The preparation method of the anti-crack mortar comprises the following steps: and uniformly mixing the waste brick powder and part of water, adding the cement, the regenerated sand, the activity excitant, the fiber, the redispersible latex powder and the cellulose ether which are uniformly mixed in advance, adding the rest water, and uniformly mixing to obtain the anti-crack mortar. The cover formed by the anti-crack mortar has excellent anti-crack performance, high strength and easy maintenance, and is suitable for large-scale application.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to anti-crack mortar and a preparation method and application thereof.
Background
With the continuous advance of urbanization construction, most buildings constructed in the 20 th century 50 s to 90 s need to be dismantled, and a large amount of construction waste is generated. The waste brick material accounts for 40-70% of the total amount of the construction waste, and the waste brick material is treated in the traditional method of piling, landfill and the like, so that the waste brick material not only occupies land, but also can dissolve out harmful substances to pollute underground water under the action of rainwater. In recent years, waste bricks are crushed and screened to prepare recycled brick aggregates which are then used as low-end building materials such as roadbed subbase layers or water stabilization layers and the like, so that the resource utilization of the waste bricks is realized to a certain extent, but the recycled brick aggregates prepared from the waste bricks are porous and have low intrinsic strength, cannot replace natural aggregates such as sand stones and the like at all, and the application is greatly limited.
Therefore, how to reasonably utilize the waste brick materials in a large scale and improve the added value of the waste brick materials has very important significance.
Disclosure of Invention
The invention aims to provide anti-crack mortar and a preparation method and application thereof.
The technical scheme adopted by the invention is as follows:
the anti-crack mortar comprises the following components in parts by mass:
waste brick powder: 25-45 parts of a stabilizer;
cement: 15-25 parts;
reclaimed sand: 65-80 parts;
an activity activator: 0 to 8 portions;
fiber: 0 to 6 parts;
redispersible latex powder: 1-5 parts;
cellulose ether: 0.006 part to 0.018 part;
water: 20 to 40 portions.
Preferably, the waste brick powder is waste clay brick powder with the particle size of less than 350 microns and the median particle size of 55 microns-75 microns.
More preferably, the waste brick powder is waste clay brick powder with the grain diameter of 10-100 mu m and the median grain diameter of 55-75 mu m.
Preferably, the waste brick powder is prepared by crushing and grinding waste clay bricks.
Preferably, the cement is at least one of portland cement, ordinary portland cement and composite portland cement.
Preferably, the reclaimed sand is fine aggregate obtained by crushing and screening waste concrete or/and waste mortar.
Preferably, the particle size distribution of the reclaimed sand meets the requirement of fine sand in a region II or a region III specified in GB/T14684-2011 construction sand.
Further preferably, the fineness modulus of the reclaimed sand is 2.2-2.7.
Preferably, the activity promoter is a mixture of water glass, sulfate and hydrated lime.
Preferably, the sulfate is at least one of sodium sulfate and calcium sulfate.
Preferably, the fibers are polymeric fibers.
Further preferably, the fiber is at least one of polypropylene fiber, polyacrylonitrile fiber and polyester fiber.
Preferably, the fibers have a length of 3mm to 6mm and a diameter of 18 μm to 48 μm.
Preferably, the redispersible latex powder is at least one of ethylene-vinyl acetate copolymer, vinyl acetate-vinyl versatate copolymer and acrylate-styrene copolymer.
Preferably, the cellulose ether is at least one of hydroxypropyl methyl cellulose ether, methyl cellulose ether and ethyl cellulose ether.
The preparation method of the anti-crack mortar comprises the following steps: and uniformly mixing the waste brick powder and part of water, adding the cement, the regenerated sand, the activity excitant, the fiber, the redispersible latex powder and the cellulose ether which are uniformly mixed in advance, adding the rest water, and uniformly mixing to obtain the anti-crack mortar.
The invention has the beneficial effects that: the cover formed by the anti-crack mortar has excellent anti-crack performance, high strength and easy maintenance, and is suitable for large-scale application.
Specifically, the method comprises the following steps:
1) According to the invention, by reasonably controlling the particle size distribution of the waste brick powder, the large pores are damaged while the small pores are reserved, so that the water requirement of the anti-crack mortar is greatly increased, the responsiveness of the waste brick powder to the internal relative humidity of the anti-crack mortar is maintained, and the anti-crack performance of the anti-crack mortar can be improved through the water storage-water release effect;
2) The waste brick powder added in the anti-crack mortar contains glass state SiO 2 And Al 2 O 3 The two active components can fully exert the volcanic ash activity of the anti-crack mortar, and ensure the long-term mechanical property continuous development of the anti-crack mortar;
3) The waste brick powder added in the anti-crack mortar can be filled in a gap formed by stacking fine aggregates, the using amount of a cementing material is reduced by improving the particle composition, the mortar workability is improved, in addition, the mechanical engaging force with cement paste is increased due to the irregular and porous surface appearance of the waste brick powder, the actual water-cement ratio of an interface area is favorably reduced, and the strength and the anti-crack performance of the formed front cover can be effectively improved through the improvement of interface bonding;
4) The waste brick powder added into the anti-crack mortar disclosed by the invention does not need high-energy-consumption pretreatment such as thermal activation, and the anti-crack mortar only needs to be cured at normal temperature and normal pressure, and does not need to be further cured at high temperature and high pressure to improve the strength, so that the anti-crack mortar has the outstanding advantages of low preparation energy consumption, strong operability, easy realization of curing conditions and the like;
5) The invention utilizes the reclaimed sand to completely replace the natural sand, and utilizes the waste brick powder to replace 50 to 75 percent (by mass) of cementing material to prepare the anti-crack mortar, thereby being beneficial to nearby consumption and large-dosage resource utilization of the construction waste, realizing high added value utilization of the construction waste and reducing the environmental load of the whole life cycle of the anti-crack mortar.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
an anti-crack mortar, the composition of which is shown in the following table:
TABLE 1 composition table of anti-crack mortar
Note:
waste clay brick powder: the brick is prepared by crushing and grinding waste clay bricks;
reclaimed sand: obtained by crushing and screening waste concrete.
The preparation method of the anti-crack mortar comprises the following steps:
uniformly stirring the waste clay brick powder and 1/2 of water, adding uniformly stirred PO42.5 ordinary portland cement, regenerated sand, water glass, calcium sulfate, hydrated lime, polypropylene fiber, ethylene-vinyl acetate copolymer and hydroxypropyl methyl cellulose ether, adding the rest water, and uniformly stirring to obtain the anti-crack mortar.
Example 2:
an anti-crack mortar, the composition of which is shown in the following table:
TABLE 2 composition table of anti-crack mortar
Note:
waste clay brick powder: the brick is prepared by crushing and grinding waste clay bricks;
reclaimed sand: obtained by crushing and screening waste concrete.
The preparation method of the anti-crack mortar comprises the following steps:
uniformly stirring the waste clay brick powder and 1/2 of water, adding the PO42.5 ordinary portland cement, the reclaimed sand, the water glass, the calcium sulfate, the hydrated lime, the polypropylene fiber, the ethylene-vinyl acetate copolymer and the hydroxypropyl methyl cellulose ether which are uniformly stirred in advance, adding the rest water, and uniformly stirring to obtain the anti-crack mortar.
Example 3:
an anti-crack mortar, the composition of which is shown in the following table:
TABLE 3 composition table of anti-crack mortar
Note:
waste clay brick powder: the brick is prepared by crushing and grinding waste clay bricks;
reclaimed sand: obtained by crushing and screening waste concrete.
The preparation method of the anti-crack mortar comprises the following steps:
uniformly stirring the waste clay brick powder and 1/2 of water, adding uniformly stirred PO42.5 ordinary portland cement, regenerated sand, water glass, calcium sulfate, hydrated lime, polypropylene fiber, ethylene-vinyl acetate copolymer and hydroxypropyl methyl cellulose ether, adding the rest water, and uniformly stirring to obtain the anti-crack mortar.
Comparative example 1:
an anti-crack mortar, the composition of which is shown in the following table:
TABLE 4 composition table of anti-crack mortar
Note:
reclaimed sand: obtained by crushing and screening waste concrete.
The preparation method of the anti-crack mortar comprises the following steps:
and (3) uniformly stirring 1/2 of PO42.5 ordinary portland cement and 1/2 of water, adding the remaining PO42.5 ordinary portland cement, regenerated sand, water glass, calcium sulfate, hydrated lime, polypropylene fiber, ethylene-vinyl acetate copolymer and hydroxypropyl methyl cellulose which are uniformly stirred in advance, adding the remaining water, and uniformly stirring to obtain the anti-crack mortar.
Comparative example 2:
an anti-crack mortar, the composition of which is shown in the following table:
TABLE 5 composition table of anti-crack mortar
Note:
waste clay brick powder: the brick is prepared by crushing and grinding waste clay bricks;
reclaimed sand: obtained by crushing and screening waste concrete.
The preparation method of the anti-crack mortar comprises the following steps:
uniformly stirring the waste clay brick powder, PO42.5 ordinary portland cement, reclaimed sand, calcium sulfate, slaked lime, polypropylene fiber, ethylene-vinyl acetate copolymer, hydroxypropyl methyl cellulose ether and water to obtain the anti-crack mortar.
Comparative example 3:
an anti-crack mortar, the composition of which is shown in the following table:
TABLE 6 composition table of anti-crack mortar
Note:
waste clay brick powder: the brick is prepared from waste clay bricks through crushing and grinding.
The preparation method of the anti-crack mortar comprises the following steps:
uniformly stirring the waste clay brick powder and 1/2 of water, adding the PO42.5 ordinary portland cement, natural sand, water glass, calcium sulfate, hydrated lime, polypropylene fiber, ethylene-vinyl acetate copolymer and hydroxypropyl methyl cellulose ether which are uniformly stirred in advance, adding the rest water, and uniformly stirring to obtain the anti-crack mortar.
And (3) performance testing:
the anti-crack mortar of the examples 1 to 3 and the comparative examples 1 to 3 were subjected to a performance test with reference to the standard of "JG/T158-2013 glue powder polyphenyl particle external thermal insulation system material", and the obtained performance test results are shown in the following table:
TABLE 7 results of the performance test of the anti-crack mortars of examples 1 to 3 and comparative examples 1 to 3
As can be seen from Table 7:
1) The anti-crack mortar of the embodiment 1 is added with the waste clay brick powder, and compared with the anti-crack mortar of the comparative example 1, the anti-crack performance of the formed cover is obviously improved;
2) With the gradual increase of the proportion of the waste clay brick powder replacing PO42.5 common portland cement in the anti-crack mortar of the embodiments 1 to 3, the operable time of the anti-crack mortar is increased by 0.14h, the tensile bonding strength is increased by 15.0%, the soaking tensile bonding strength is increased by 8.9%, and the fracture ratio is reduced by 14.9%, which indicates that the anti-crack mortar with more excellent performance can be obtained by using the waste clay brick powder to replace the PO42.5 common portland cement;
3) Compared with the anti-crack mortar prepared by a direct mixing method in the comparative example 2, although the operation time of the anti-crack mortar prepared by the step-by-step stirring method in the example 2 is not obviously changed, the tensile bonding strength and the water-soaking tensile bonding strength are respectively improved by 9.0 percent and 11.0 percent, and the fracture ratio is reduced by 15.3 percent;
4) Compared with the anti-crack mortar prepared by adopting the natural sand in the comparative example 3, the anti-crack mortar prepared by adopting the regenerated sand has almost unchanged performance, which shows that the regenerated sand can obtain the same effect as the natural sand;
in conclusion, the waste brick powder and the reclaimed sand are used for replacing cement and natural sand to prepare the anti-crack mortar, so that the operable time of the anti-crack mortar can be effectively prolonged, the tensile bonding strength and the soaking tensile bonding strength are improved, the compression-fracture ratio is reduced, and the method is suitable for preparing the anti-crack mortar by using the waste brick powder in a large mixing amount.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. The anti-crack mortar is characterized by comprising the following components in parts by mass:
waste brick powder: 25-45 parts of a stabilizer;
cement: 15-25 parts;
reclaimed sand: 65-80 parts;
activity excitant: 0 to 8 portions;
fiber: 0 to 6 parts;
redispersible latex powder: 1-5 parts;
cellulose ether: 0.006 part to 0.018 part;
water: 20-40 parts;
the waste brick powder is waste clay brick powder with the grain diameter of 10-100 mu m and the median grain diameter of 55-75 mu m;
the reclaimed sand is fine aggregate obtained by crushing and screening waste concrete or/and waste mortar;
the fineness modulus of the reclaimed sand is 2.2-2.7.
2. The anti-crack mortar according to claim 1, wherein: the cement is at least one of Portland cement, ordinary Portland cement and composite Portland cement.
3. The anti-crack mortar according to claim 1, wherein: the activity excitant is a mixture of water glass, sulfate and hydrated lime.
4. The anti-crack mortar according to claim 1, wherein: the fibers are polymer fibers.
5. The anti-crack mortar according to claim 1, wherein: the redispersible latex powder is at least one of ethylene-vinyl acetate copolymer, vinyl acetate-vinyl versatate copolymer and acrylate-styrene copolymer.
6. The anti-crack mortar according to claim 1, wherein: the cellulose ether is at least one of hydroxypropyl methyl cellulose ether, methyl cellulose ether and ethyl cellulose ether.
7. The method for preparing the anti-crack mortar according to any one of claims 1 to 6, comprising the steps of: and uniformly mixing the waste brick powder and part of water, adding the cement, the regenerated sand, the activity excitant, the fiber, the redispersible latex powder and the cellulose ether which are uniformly mixed in advance, adding the rest water, and uniformly mixing to obtain the anti-crack mortar.
8. Use of the anti-crack mortar of any one of claims 1 to 6 for preparing a cover of an exterior wall insulation layer, a polystyrene board or an extruded board.
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| CN202111488842.2A CN114315265B (en) | 2021-12-07 | 2021-12-07 | Anti-crack mortar and preparation method and application thereof |
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| CN202111488842.2A CN114315265B (en) | 2021-12-07 | 2021-12-07 | Anti-crack mortar and preparation method and application thereof |
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| CN114315265B true CN114315265B (en) | 2022-11-18 |
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