CN108314375A - A kind of regeneration viscose glue mortar and preparation method thereof - Google Patents

Abstract

The invention provides a formula of recycled viscose mortar. The invention further provides a preparation method of recycled viscose mortar. The present invention further provides a recycled viscose mortar and its application. The regenerated viscose mortar and its preparation method provided by the present invention not only solve the problem of demand for high-quality natural fine aggregate in special viscose mortar, but also reduce the amount of cement used, and the large-scale application of related achievements further promotes The level of construction waste resources in my country has been improved, especially for the application of high-quality recycled fine aggregate and high-activity recycled powder in special viscose mortar proposed in this invention, and the real full "regeneration" of special viscose mortar has been realized. Raw material preparation, environmental benefits, economic benefits and social benefits are more significant.

Description

A kind of recycled viscose mortar and preparation method thereof

technical field

The invention belongs to the technical field of civil engineering materials, and relates to a recycled viscose mortar and a preparation method thereof, in particular to a viscose mortar prepared by using recycled raw materials and a preparation method thereof.

Background technique

Waste concrete and waste red bricks in construction waste account for about 4/5 of the total amount of urban construction waste. Through recycling technology, using waste concrete and bricks to produce recycled materials is an effective way to realize construction waste resources. At this stage, the recycled raw materials produced in my country are mainly recycled fine aggregate and powder with a particle size of 0.1-5mm, and recycled coarse aggregate with a particle size of 5-31.5mm. A wide range of high-quality applications for recycled coarse aggregate can be carried out; however, for recycled fine aggregate and recycled powder, most of them are used as filling materials for low-quality and extensive applications, how to realize the combination of recycled fine aggregate and recycled powder The application of high quality and high added value is the future development direction of my country's construction waste recycling.

With the development of my country's construction industry, the demand for natural sand and gravel aggregates is increasing; in particular, the demand for high-quality natural raw materials in the production of special mortar is more urgent. However, my country has gradually reduced the mining of natural sand and gravel aggregates to alleviate the increasingly serious environmental problems. There is a serious shortage and insufficient supply of natural sand and gravel aggregates in many areas of our country, which restricts the healthy and orderly development of the construction industry. Therefore, it is urgent to develop building materials that can replace natural building materials, especially high-quality recycled fine aggregates. Viscose mixtures (such as tile adhesive mixtures) are mostly high-quality natural fine aggregates between 40 mesh and 140 mesh, but the supply of high-quality natural fine aggregates in my country has been unable to meet the production requirements of special viscose mortar mixtures. need. At the same time, with the continuous increase of cement stone mining, there has been a shortage of high-quality cement stone and cement. Therefore, at this stage, there is an urgent need to develop a recycled aggregate similar to high-quality natural aggregates, and an active recycled powder with gel properties of cement materials.

Contents of the invention

In view of the shortcomings of the above-mentioned prior art, to solve the problem of insufficient supply of my country's construction waste recycling industry and high-quality natural raw materials, combined with construction waste recycling and high-quality renewable raw material production technology, the purpose of the present invention is to provide a low production cost, The production of viscose mortar with high waste material utilization rate, high added value, simple process, good mechanical performance, green and environmentally friendly high-quality recycled raw materials and its preparation method can be used for large-scale production and engineering application of viscose mortar such as tile adhesive.

In order to achieve the above purpose and other related purposes, the first aspect of the present invention provides a formula for recycled viscose mortar, which includes the following components in parts by weight:

After the above components are metered and mixed, the desired viscose mortar mixture produced from recycled raw materials can be prepared. Preferably, the formula of the regenerated viscose mortar comprises the following components in parts by weight:

More preferably, the formula of the regenerated viscose mortar comprises the following components in parts by weight:

Further preferably, the formula of the regenerated viscose mortar includes the following components in parts by weight:

Preferably, the cement is selected from Portland cement or ordinary Portland cement. The ordinary portland cement is made by adding 6-20% of mixed materials and appropriate amount of gypsum to the portland cement clinker. Because the ordinary portland cement contains less mixed materials, its composition is relatively close to that of portland cement, so the performance of the two is also relatively close, and it can be replaced under certain conditions, such as those that require rapid hardening and high strength. For concrete, Portland cement is generally preferred, and ordinary Portland cement can also be used. Ordinary Portland cement has a wider application range.

Preferably, the strength grade of the cement is ≥32.5. More preferably, the strength grade of the cement is ≥42.5 grade.

Preferably, the active regeneration powder is crushed construction waste into a fine powder with a particle size of ≤75 μm. The active regeneration powder is a mineral admixture (gelling material).

More preferably, in the active regenerated powder, the active regenerated powder with a particle size of ≤45 μm accounts for ≥50% by mass of the total active regenerated powder.

Further preferably, in the active regeneration powder, the active regeneration powder with a particle diameter of ≤45 μm accounts for ≥88% by mass of the total active regeneration powder.

Still further preferably, in the active regeneration powder, the active regeneration powder with a particle size of ≤30 μm accounts for ≥95% by mass of the total active regeneration powder.

Preferably, the active regenerated powder is in a completely dry state. The completely dry state is that the active regenerated powder is dried in a drying oven at 100-110°C for 24 hours and the mass change of the active regenerated powder is <0.1%. .

Preferably, the natural fine aggregate is natural river sand with a particle size of 40-140 mesh.

Preferably, in the natural fine aggregate, the mass ratio of the natural fine aggregate with a particle size of 40-120 mesh to the natural fine aggregate with a particle size of 120-140 mesh is ≥ 3:1.

Preferably, the natural fine aggregate is washed with water, the mud content of the washed natural fine aggregate is ≤0.8%, and the mud content of the washed natural fine aggregate is ≤0.3%.

Preferably, the recycled fine aggregate is crushed construction waste into construction waste particles with a particle size of 40-140 mesh. The regenerated fine aggregate is obtained by crushing and screening construction waste. The crushing is carried out with a cone crusher. The sieving is carried out using a mechanical sieving machine.

Preferably, in the recycled fine aggregate, the mass ratio of the recycled fine aggregate with a particle size of 40-120 mesh to the recycled fine aggregate with a particle size of 120-140 mesh is ≥3:1.

Preferably, the regenerated fine aggregate is washed with water, the washed regenerated fine aggregate has a mud content of ≤0.5%, and the washed regenerated fine aggregate has a mud content of ≤0.3%.

More preferably, the construction waste includes waste concrete and waste red bricks.

Further preferably, the mass percentage of the waste red bricks in the construction waste is ≤50%.

Still further preferably, the mass percentage of the waste red bricks in the construction waste is ≤20%.

Preferably, the cellulose is selected from one of hydroxypropylmethylcellulose or lignocellulose. Ensure that the mortar prepared from the recycled viscose mortar mixture has good working performance and good appearance performance (no cracking).

Preferably, the heavy calcium carbonate is conventionally used heavy calcium carbonate, which can be purchased from the market. The ground calcium carbonate ensures that the mortar prepared from the recycled viscose mortar mixture has good toughness and strength, and simultaneously has the functions of rapid solidification and lubrication.

Preferably, the redispersible latex powder is a conventionally used redispersible latex powder, which can be purchased from the market. Specifically, the redispersible latex powder is selected from copolymerization powder of vinyl acetate and ethylene, ternary copolymerization powder of ethylene, vinyl chloride and vinyl laurate, ternary copolymerization powder of vinyl acetate, ethylene and higher fatty acid vinyl ester. Powder, vinyl acetate homopolymer powder, styrene and butadiene copolymer powder. The redispersible latex powder is used to improve the construction performance and flow performance of the mortar prepared from the regenerated viscose mortar mixture.

Preferably, the starch ether is conventionally used starch ether, which can be purchased from the market. Specifically, the starch ether is modified by a natural polysaccharide polymer such as dextran or mannan to obtain a water-soluble powder. The starch ether ensures that the mortar prepared from the recycled viscose mortar mixture has good sag resistance and good lubricity, which can improve the operating performance of the material and make the operation smoother.

The second aspect of the present invention provides a kind of preparation method of recycled viscose mortar, comprising the following steps:

1) According to the formula ratio, take each component and stir to obtain the recycled viscose mortar mixture;

2) After mixing the recycled viscose mortar mixture with water, the required recycled viscose mortar is obtained.

Preferably, in step 1), the stirring time is ≥2min. More preferably, the stirring time is ≥10 min. Mix the different components thoroughly.

Preferably, in step 1), the stirring temperature is 10-60°C. More preferably, the stirring temperature is 20-40°C.

Preferably, in step 1), the relative humidity of the stirring is ≤50%. More preferably, the relative humidity of the stirring is ≤20%. Ensure that the powder does not hydrate and harden after mixing.

Preferably, in step 1), in the recycled viscose mortar mixture, the recycled fine aggregate is obtained by crushing and screening construction waste.

More preferably, the crushing is carried out with a jaw crusher or a cone crusher.

More preferably, the sieving is carried out by using a mechanical vibrating sieve bed.

Preferably, in step 1), in the regenerated viscose mortar mixture, the active regenerated powder is obtained by crushing construction waste and then grinding and sieving.

More preferably, the crushing is carried out with a jaw crusher or a cone crusher.

More preferably, the grinding is performed using a ball mill.

More preferably, the sieving is carried out by using a mechanical vibrating sieve bed.

Preferably, in step 2), the mass ratio of the recycled viscose mortar mixture to water is 1:0.1-0.4.

More preferably, the mass ratio of the recycled viscose mortar mixture to water is 1:0.15-0.35.

Further preferably, the mass ratio of the recycled viscose mortar mixture to water is 1:0.2-0.3.

Preferably, in step 2), the mixing time is ≥ 1 min. More preferably, the mixing time is 3-5 minutes.

The third aspect of the invention provides a regenerated viscose mortar, which is prepared from the above-mentioned regenerated viscose mortar formula or the above-mentioned regenerated viscose mortar preparation method.

The fourth aspect of the invention provides the application of recycled viscose mortar on tile adhesive or stone adhesive.

The fifth aspect of the present invention provides a construction method of regenerated viscose mortar. The regenerated viscose mortar is respectively coated on the cleaned wall surface and the back of the tiles or stones to be bonded, and the back of the tiles or stones is forcefully applied. Knead and extrude onto the wall surface for bonding.

Preferably, the construction temperature is 5-35°C. More preferably, the construction temperature is 20-35°C.

Preferably, the recycled viscose mortar should be used within 2-3 hours.

Preferably, avoid water shower during construction and within 24 hours after construction.

As mentioned above, a kind of recycled viscose mortar provided by the present invention and its preparation method have the following beneficial effects:

1) A kind of recycled viscose mortar and its preparation method provided by the present invention, the raw materials used for the production of high-quality recycled fine aggregate and highly active recycled powder are all from construction waste, through efficient screening, crushing and grinding and other resources Using chemical technology to obtain high-quality recycled fine aggregate with high particle roundness similar to high-quality natural sand, and high-quality recycled powder with good fineness and activity similar to cement, so as to ensure The prepared recycled viscose mortar mixture and the recycled viscose mortar have excellent working performance and mechanical properties.

2) A recycled viscose mortar and its preparation method provided by the present invention combine high-quality recycled fine aggregate and active recycled powder with the preparation of viscose mortar mixture, and for the first time propose to use high-quality recycled raw materials to produce special viscose The preparation method of the mortar mixture has the characteristics of low production cost, high environmental benefit and economic benefit, and solves the problem of insufficient supply of high-quality natural sand and high-quality cement stone in my country at the present stage.

3) The regenerated viscose mortar and its preparation method provided by the present invention have changed the traditional extensive construction waste recycling mode, and provided a new recycling method for my country's construction waste recycling through the production and application of high-quality recycled raw materials. The path is to transform the resource disposal from the traditional extensive type to a refined high value-added industry.

4) In the regenerated viscose mortar provided by the present invention and its preparation method, the fineness and mud content of the high-quality regenerated fine aggregate used can reach or even exceed the relevant parameters of high-quality natural sand. It is widely used in the preparation of recycled tile adhesives, and its construction performance, appearance and safety performance all meet the requirements of engineering and specification standards.

5) A recycled viscose mortar and its preparation method provided by the present invention, the recycled viscose mortar produced by the proposed "high-quality recycled fine aggregate-high activity recycled powder" system with recycled raw materials has higher resource utilization efficiency, It can greatly absorb construction waste and speed up the process of recycling construction waste in my country.

Detailed ways

The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the protection scope of the present invention.

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

Following comparative example 1 and the used raw material of embodiment 1-3:

1) Cement: P.O42.5 Ordinary Portland Cement.

2) Construction waste: a mixture of waste concrete and waste red bricks, wherein the mass percentage of waste red bricks in construction waste is 10%.

3) Active regeneration powder: construction waste with a particle size of ≤75 μm after crushing, and the active regeneration powder with a particle size of ≤45 μm accounts for ≥88% of the total mass of the active regeneration powder.

4) Natural fine aggregate: natural river sand with a particle size of 40-140 mesh, 40% of the natural fine aggregate with a particle size of 40-80 mesh, and 40% of the natural fine aggregate with a particle size of 80-120 mesh , the particle size is 120-140 mesh natural fine aggregate accounts for 20%. The mud content of natural fine aggregate is ≤0.2%.

5) Regenerated fine aggregate: construction waste with a particle size of 40-140 mesh after crushing. Regenerated fine aggregate with a particle size of 40-80 mesh accounts for 40%, recycled fine aggregate with a particle size of 80-120 mesh accounts for 40%, and recycled fine aggregate with a particle size of 120-140 mesh accounts for 20%. The mud content of recycled fine aggregate is ≤0.2%.

6) Cellulose: Lignocellulose that meets national standards.

7) Heavy calcium carbonate: routinely used heavy calcium carbonate that meets national standards.

8) Redispersible latex powder: redispersible latex powder for regular use in line with national standards.

9) Starch ethers: routinely used starch ethers that meet national standards.

Comparative example 1

A control sample of the recycled viscose mortar mixture was prepared according to the following formula ratio, and the ratio of the control sample of the recycled viscose mortar mixture is shown in Table 1. The control sample of the regenerated viscose mortar obtained after mixing the control sample of the regenerated viscose mortar mixture with water. Among them, the mass ratio of the control sample of recycled viscose mortar mixture to water is 1:0.25. The control sample of the regenerated viscose mortar was used for construction, and there was no barrier to scratching by using the thin sticking method. The spreading rate met the standard, and there was no obvious apparent cracking. The measured tensile bonding strength was ≥0.9MPa, and the tensile bonding strength was ≥ 1.0MPa, the relevant technical indicators meet the requirements of the national standard (JC/T547-2005).

Table 1

Recipe Components Mix ratio (kg) cement 330 Active regeneration powder 0 natural fine aggregate 600 recycled fine aggregate 0 Lignocellulosic 4 Ground calcium carbonate 5 Redispersible latex powder 20 starch ether 10

Example 1

Prepare recycled viscose mortar mixture sample 1# according to the following formula ratio, and the ratio of recycled viscose mortar mixture sample 1# is shown in Table 2. The recycled viscose mortar sample 1* obtained after mixing the recycled viscose mortar mixture sample 1# with water. Among them, the mass ratio of recycled viscose mortar mixture sample 1# to water is 1:0.25. The regenerated viscose mortar sample 1* was used for construction, and the thin paste method was used to scrape without obstacles. The spreading rate met the standard, and there was no obvious apparent cracking. 1.1MPa, the relevant technical indicators meet the requirements of the national standard (JC/T 547-2005).

Table 2

Recipe Components Mix ratio (kg) cement 330 Active regeneration powder 0 natural fine aggregate 300 recycled fine aggregate 300 Lignocellulosic 4 Ground calcium carbonate 5 Redispersible latex powder 20 Starch ether 10

Example 2

The regenerated viscose mortar mixture sample 2# was prepared according to the following formula ratio, and the ratio of the regenerated viscose mortar mixture sample 2# is shown in Table 3. The recycled viscose mortar sample 2* obtained after mixing the recycled viscose mortar mixture sample 2# with water. Among them, the mass ratio of recycled viscose mortar mixture sample 2# to water is 1:0.25. The regenerated viscose mortar sample 2* was used for construction, and the thin paste method was used to scrape without obstacles. The spreading rate met the standard, and there was no obvious apparent cracking. 1.1MPa, the relevant technical indicators meet the requirements of the national standard (JC/T 547-2005).

table 3

Recipe Components Mix ratio (kg) cement 330 Active regeneration powder 0 natural fine aggregate 0 recycled fine aggregate 600 Lignocellulosic 4 Ground calcium carbonate 5 Redispersible latex powder 20 Starch ether 10

Example 3

Prepare recycled viscose mortar mixture sample 3# according to the following formula ratio, and the ratio of recycled viscose mortar mixture sample 3# is shown in Table 4. The recycled viscose mortar sample 3* obtained after mixing the recycled viscose mortar mixture sample 3# with water. Among them, the mass ratio of recycled viscose mortar mixture sample 3# to water is 1:0.28. The regenerated viscose mortar sample 3* was used for construction, and the thin sticking method was used to scrape without obstacles. The spreading rate met the standard, and there was no obvious apparent cracking. The measured tensile bonding strength was ≥1.1MPa, and the tensile bonding strength after immersion was ≥ 1.2MPa, the relevant technical indicators meet the requirements of the national standard (JC/T 547-2005).

Table 4

Recipe Components Mix ratio (kg) cement 270 Active regeneration powder 60 natural fine aggregate 0 recycled fine aggregate 600 Lignocellulosic 4 Ground calcium carbonate 5 Redispersible latex powder 20 Starch ether 10

Based on the above Comparative Example 1 and Examples 1-3, the working performance, coating rate index, apparent characteristics and tensile bonding strength of recycled viscose mortar produced with recycled raw materials were determined. The results show that the production of recycled viscose mortar with recycled raw materials has good working performance and mechanical properties, which meet the requirements of national standards, and can well meet the construction and safety of recycled viscose mortar.

In summary, the regenerated viscose mortar and its preparation method provided by the present invention not only solve the problem of demand for high-quality natural fine aggregate in regenerated viscose mortar, but also reduce the amount of cement used. The large-scale application has further promoted the level of resource utilization of construction waste in my country, especially for the joint application of high-quality recycled fine aggregate and high-activity recycled powder proposed in the present invention, which has realized the recycling of recycled materials in recycled viscose mortar, and the environment Benefits, economic benefits and social benefits are more significant. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims (10)

1. a kind of formula of regeneration viscose glue mortar, in parts by weight, including following components：

2. a kind of formula of regeneration viscose glue mortar according to claim 1, which is characterized in that the component includes following item Any one of part is multinomial：

A1) any one of the cement in portland cement or Portland cement；

A2) the active regeneration powder is the fineness powder that building castoff is broken for grain size≤75 μm；

A3) the natural fine aggregate is natural river sand of the grain size in 40-140 mesh；

A4) recycled fine aggregate be by building castoff be broken for grain size 40-140 mesh construction waste composition granule；

A5) the one kind of the cellulose in hydroxypropyl methyl cellulose or lignocellulosic.

3. a kind of formula of regeneration viscose glue mortar according to claim 2, which is characterized in that the building castoff includes There are waste concrete and useless common brick, the useless common brick to account for mass percent≤50% of building castoff.

4. a kind of preparation method of regeneration viscose glue mortar, includes the following steps：

1) formulation ratio is pressed, after taking each component to be stirred, obtains regeneration viscose glue mortar mixture；

2) regeneration viscose glue mortar mixture and water are carried out after mix to get required regeneration viscose glue mortar again.

5. a kind of preparation method of regeneration viscose glue mortar according to claim 4, which is characterized in that described in step 1) The time of stirring >=2min；The temperature of the stirring is 10-60 DEG C；Relative humidity≤50% of the stirring.

6. a kind of preparation method of regeneration viscose glue mortar according to claim 4, which is characterized in that described in step 2) The mass ratio for regenerating viscose glue mortar mixture and water is 1:0.1-0.4.

7. a kind of preparation method of regeneration viscose glue mortar according to claim 4, which is characterized in that described in step 2) The time of mix >=1min.

8. a kind of regeneration viscose glue mortar, by according to any formulas for regenerating viscose glue mortar of claim 1-3 or according to power Profit requires the preparation method of any regeneration viscose glue mortars of 4-7 to prepare.

9. purposes of the regeneration viscose glue mortar according to claim 8 on glue for tile or stone material glue.

10. a kind of construction method of regeneration viscose glue mortar, regeneration viscose glue mortar according to claim 8 is coated on respectively The back side of metope face layer, ceramic tile to be bonded or stone material after cleaning, the back side of ceramic tile or stone material is firmly rubbed and is extruded into metope face It is bonded on layer.