1. An application of waste clay brick powder in preparing plastering mortar.

2. The use of claim 1, wherein: the mixing amount of the waste clay brick powder for replacing cement is 5-20% by weight.

3. Use according to claim 1 or 2, characterized in that: the mixing amount of the waste clay brick powder for replacing sand is 10-25% by weight.

4. A method for preparing plastering mortar by using waste clay brick powder is characterized by comprising the following steps: comprises the following raw materials: 25 percent of waste clay brick powder, 28.5 percent of Portland cement, 43.2 percent of sand, 3 percent of redispersible latex powder, 0.1 percent of cellulose ether and 0.2 percent of water repellent.

5. The method of claim 4, wherein: the particle size of the waste clay brick powder is more than 0.15 mm.

6. The method of claim 4, wherein: the water repellent is one of stearate and organic silicon.

7. The method of claim 4, wherein: the re-dispersible latex powder is one or a mixture of more than one of ethylene/vinyl acetate copolymer and acrylic acid copolymer.

8. The method of claim 4, wherein: the water-cement ratio is 0.6 and the bone-cement ratio is 1.2.

9. The method of claim 4, wherein: the configuration method comprises the following steps:

(1) collecting the building demolition or construction site waste bricks, crushing, grinding and screening brick powder with the grain size of 0.15mm, 0.15-0.6mm and more than 0.6mm respectively, wherein the brick powder with the grain size of 0.15mm replaces cement, and the brick powder with the grain size of 0.15-0.6mm and the brick powder with the grain size of 0.6mm replace sand according to the actual engineering requirements; preparing the screened medium sand for later use, namely preparing portland cement, redispersible latex powder, a water repellent and cellulose ether;

(2) mixing and uniformly stirring the raw materials to obtain the special plastering mortar;

(3) and covering with alkali-resistant glass fiber mesh cloth after the mortar is prepared.

Background art:

with the increasing speed of modern construction steps in cities and countryside in China, a large number of houses are removed, and the quantity of construction waste generated by the removal of the houses is rapidly increased, wherein the waste clay bricks occupy a large proportion. It is reported that China produces about 200X 108m in the last 50 years³And these clay bricks will become solid waste within the next 50 years. Current dominance on solid wasteThe treatment mode is stacking or landfill, the extensive treatment method not only occupies a large amount of land resources, but also generates a large amount of dust in the stacking process, is easy to cause secondary pollution, seriously affects the health of residents and aggravates the environmental pollution. Research shows that the waste clay brick contains various active mineral components, wherein the content of silicon dioxide and aluminum oxide is high, and the waste clay brick has certain volcanic ash activity, and the waste clay brick is ground to prepare clay brick powder which can be used as a cement admixture. The cement is compounded with calcined clay and limestone powder to prepare concrete with certain strength and performance. Although calcined clays are more active, they are more costly and the calcination process also produces carbon emissions. If the regenerated clay brick powder can be used as a blending material to replace part of cement to prepare a mortar plastering material, the cement consumption can be reduced, and the existing waste resources can be fully utilized.

The invention content is as follows:

the invention aims to solve the technical problem that the current main treatment mode of the waste clay bricks is stacking or landfill, the rough treatment method not only occupies a large amount of land resources, but also generates a large amount of dust in the stacking process, and is easy to cause secondary pollution.

In order to solve the problems, the invention provides the application of the waste clay brick powder and the preparation method of the special plastering mortar for processing the extruded polystyrene board by using the waste clay brick powder, the waste clay brick powder is supplemented with the dispersible latex powder, the water repellent, the cellulose ether and the like to improve the performance of the common mortar, the plastering mortar is endowed with better tensile bonding strength and water absorption, the operation time is proper, the problems of freeze thawing of the plastering mortar and the pull-down stress loss in a water immersion environment are solved, and the recycling value of the waste clay brick is improved.

In order to achieve the purpose, the invention is realized by the following technical scheme: an application of waste clay brick powder in preparing plastering mortar. The waste clay brick powder is used for replacing part of cement and sand, the particle strength of the waste clay brick powder is higher than that of the cement, the waste clay brick powder is doped into mortar to serve as a coarse aggregate, and in addition, the particle diameter of the waste clay brick after being ground into the brick powder is smaller than the particle diameter of the sand, so that the waste clay brick powder has better fluidity, the use approach of the waste brick powder in building materials is expanded, and the cyclic utilization of building resources is promoted.

Furthermore, the mass portion of the waste clay brick powder for replacing cement is 5-20%. The waste clay brick powder has low hydration activity and is not suitable for being doped too much. The strength is reduced little within the range of 5 to 20 percent of the mixing amount, and the waste clay brick for construction can be effectively recycled.

Furthermore, the mass portion of the waste clay brick powder replacing sand is 10-25%. The strength of the waste clay brick powder is greater than that of sand, the granular sand is small, and the sand is replaced to improve the tensile bonding strength of the plastering mortar, so that the replacement amount is preferably distributed in the range of 5-20%.

A method for preparing plastering mortar by using waste clay brick powder comprises the following raw materials in mixing amount: 25 percent of waste clay brick powder, 28.5 percent of Portland cement, 43.2 percent of sand, 3 percent of redispersible latex powder, 0.1 percent of cellulose ether and 0.2 percent of water repellent. Wherein 15 percent of the waste clay brick powder is used for replacing portland cement, and 10 percent of the waste clay brick powder is used for replacing sand. And covering with alkali-resistant glass fiber mesh cloth after the mortar is prepared.

The waste clay brick powder has high particle strength and certain hydration activity, and is doped into plastering mortar to facilitate the reuse of waste building materials.

The Portland cement is P.O42.5 type common Portland cement, and the P.O42.5 Portland cement is widely applied and plays a main role in bonding mortar.

The sand plays a role of aggregate in the plastering mortar, and is beneficial to improving the tensile bonding strength of the plastering mortar.

The redispersible latex powder has outstanding adhesive property, can improve the flexibility of mortar, endows the mortar with excellent alkali resistance, and obviously improves the tensile adhesive strength of the mortar in a standard environment.

The water repellent starts from the structure of a building material, reduces the water content to fill the pores of the mortar, enables the pores of the mortar to be compact, and improves the tensile strength of the plastering mortar. In addition, the water repellent forms a waterproof film on the surface of the mortar, and the performance of the mortar still keeps good in a soaking environment and a freeze-thawing environment.

The cellulose ether in the formula can make the mortar have better viscosity, thereby increasing the binding capacity between the mortar and the connecting plate.

Furthermore, the waste clay brick powder with the particle size of more than 0.15mm can effectively play a role of coarse aggregate.

Further, the water repellent is one of stearate and organic silicon.

Further, the redispersible latex powder is one or a mixture of more than one of ethylene/vinyl acetate copolymer and acrylic acid copolymer.

Furthermore, the water-cement ratio in the preparation is 0.6, and the bone-cement ratio is 1.2.

Further, the configuration method comprises the following steps:

(1) collecting the brick powder with the grain sizes of 0.15mm, 0.15-0.6mm and more than 0.6mm after crushing, grinding and screening the building demolition or construction site waste bricks to replace certain cement and sand, wherein the brick powder with the grain size of 0.15mm is suitable for replacing the cement, and the brick powder with the grain size of 0.15-0.6mm and the brick powder with the grain size of 0.6mm replace the sand according to the actual engineering requirements; preparing the screened medium sand for later use, namely preparing portland cement, redispersible latex powder, a water repellent and cellulose ether;

(2) mixing and uniformly stirring the raw materials to obtain the special plastering mortar;

(3) and covering with alkali-resistant glass fiber mesh cloth after the mortar is prepared.

The invention has the beneficial effects that: the waste clay brick powder is reprocessed to be used as an admixture to replace a part of cement and sand, and the common mortar performance is improved by adding different mixing amounts of medium sand, redispersible latex powder, a water repellent, cellulose ether and the like.

The specific implementation mode is as follows:

in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but 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:

an application of waste clay brick powder in preparing plastering mortar. The waste clay brick powder is used to replace part of cement and sand. A method for preparing plastering mortar from waste clay brick powder comprises the following raw materials: waste clay brick powder, Portland cement, medium sand, redispersible latex powder, a water repellent and cellulose ether. Wherein, the addition amount can be carried out according to the following table:

TABLE 1 plastering mortar compounding ratio

TABLE 2 statistical table of orthogonal experimental results

TABLE 3 worst and variance analysis best mix statistics

In order to research the influence of different matching ratios on the performance of the plastering mortar of the waste clay brick powder extruded polystyrene board, firstly, a water-cement ratio of 0.6 and a bone-cement ratio of 1.2 are obtained through a plurality of groups of experiments, then, 5 influencing factors of the plastering mortar of the extruded polystyrene board are combined in a plurality of ways by adopting an orthogonal experiment method, and then, the optimal matching ratio of the plastering mortar of the waste clay brick powder extruded polystyrene board is obtained through range analysis and variance analysis and calculation and comprehensive analysis.

According to the worst and variance analysis and the optimal mixing proportion statistical table, the factor A has the largest influence on the tensile bonding strength and the water absorption capacity of the extruded polystyrene board plastering mortar after soaking, the factor C has the largest influence on the tensile bonding strength after the operable time of 2 hours, and the factor E has the largest influence on the tensile bonding strength after freeze-thaw cycle, so that the influence of the mixing amount of the brick powder instead of cement, the mixing amount of the latex powder and the mixing amount of the water repellent on the performance of the extruded polystyrene board mortar is more important.

The level A1 is selected from 5 indexes in the optimal mixing ratio, the level A3 and the level A4 are selected from one index each time, and on the premise of meeting the basic requirements of specifications, the material consumption and various performances of the extruded polystyrene board plastering mortar are considered as much as possible, and A3 is considered comprehensively; the factor B is the most horizontal factor B which is B2 for 3 times and B4 for 4 times, the influence degree of brick powder replacing aggregate on each index of the extruded polystyrene board plastering mortar is not large, and B2 is comprehensively considered and selected; c2 is selected from 5 indexes in the factor C, and the factor C has larger influence degree on various performances of the extruded polystyrene board plastering mortar, so the factor C is determined as C2; the optimal level of the factor D is D1 for 5 times, D2 and D3 are respectively 1 time, and the influence degree of the factor D on the plastering mortar of the extruded polystyrene board is relatively small, so that D1 is comprehensively considered and selected; in the optimal mixing ratio, E1, E2 and E4 respectively appear for 2 times, E3 appears for 1 time, and E1 is comprehensively considered and selected according to the performance specification requirements of the extruded polystyrene board plastering mortar. The optimal mixing proportion A3B2C2D1E1 is obtained by the comprehensive analysis, and is 15 percent of brick powder to replace cement, 10 percent of brick powder to replace sand, 3 percent of redispersible latex powder, 0.1 percent of cellulose ether and 0.2 percent of water repellent.

The configuration method comprises the following steps:

(1) collecting the building demolition or construction site waste bricks, crushing, grinding and screening brick powder with the grain sizes of 0.15mm, 0.15-0.6mm and more than 0.6mm to replace certain cement and sand; preparing portland cement, an extruded polystyrene board, redispersible latex powder, a water repellent, cellulose ether and alkali-resistant glass fiber mesh cloth;

(2) mixing and uniformly stirring the raw materials to obtain the special plastering mortar;

(3) and covering with alkali-resistant glass fiber mesh cloth after the mortar is prepared.

The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.