Phosphorous slag-based environment-friendly self-cleaning clear water concrete

Abstract

The application discloses a phosphorous slag-based environment-friendly self-cleaning fair-faced concrete and belongs to the field of self-cleaning fair-faced concrete, and is used for solving the technical problems of obvious differences among various coating effects, limited bonding effect between the coating and the surface of the concrete, and the need of additional secondary treatment on the surface to ensure flatness during spraying of the coating, and long and cumbersome construction process in the current field of self-cleaning fair-faced concrete. The application comprises the following components according to quality: phosphorous slag 140-240 parts, white cement 50-80 parts, industrial solid waste composite powder 120-160 parts, super-hydrophobic component 11-17 parts, machine-made sand 690-780 parts, gravel 960-1020 parts, water 155-165 parts, and additive 6-11 parts. The application realizes recycling of the phosphorous slag and the industrial solid waste composite powder, reduces carbon emission in the concrete production process, and is used in cooperation with the special super-hydrophobic component, so that the construction process of the self-cleaning fair-faced concrete is effectively improved, and the peeling strength, self-cleaning performance and surface quality of the self-cleaning fair-faced concrete are greatly optimized.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of self-cleaning fair-faced concrete, and particularly relates to a phosphorous slag-based environment-friendly self-cleaning fair-faced concrete and a preparation method thereof. BACKGROUND

[0002] In the current field of fair-faced concrete, release agents and construction processes are often used to ensure that the appearance of concrete achieves the effect of fair-faced smoothness, and further hydrophobic self-cleaning is often achieved by spraying paint on the surface after the concrete is solidified. In this way, the effects of various paints are obviously different, the adhesion effect of the paint and the concrete surface is limited, and the sprayed paint also needs to be treated twice to ensure the smoothness, which is troublesome and time-consuming in construction process. Meanwhile, the proportion of cement in the cementitious material is relatively high, which needs to be improved for the current development of the concrete industry. SUMMARY

[0003] The application provides a phosphorous slag-based environment-friendly self-cleaning fair-faced concrete and a preparation method thereof, which realizes the preparation of self-cleaning fair-faced concrete with a surface hydrophobic effect by direct one-time stirring and molding, and realizes the preparation of more environmentally friendly self-cleaning fair-faced concrete with a large amount of mineral admixtures based on phosphorous slag, and the proportion of cement is less than 25%.

[0004] According to the technical scheme of the application, the following is provided:

[0005] The phosphorous slag-based environment-friendly self-cleaning fair-faced concrete is characterized in that the mass ratio of each raw material component is as follows: phosphorous slag 140-240 parts, white cement 50-80 parts, industrial solid waste composite powder 120-160 parts, super-hydrophobic component 11-17 parts, machine-made sand 690-780 parts, gravel 960-1020 parts, water 155-165 parts, and additive 6-11 parts.

[0006] Preferably, the mass ratio of each component in the super-hydrophobic component is as follows: silane coupling agent 9-15 parts, active silicon dioxide 3-8 parts, deionized water 264-293 parts, acrylate 11-17 parts, polyvinyl alcohol 8-14 parts, sodium hexadecyl benzene sulfonate 1-3 parts, ammonium persulfate 3-5 parts, and iron oxide pigment 1-3 parts.

[0007] Preferably, the silane coupling agent is one or more of vinyl triethoxysilane, acetyl trimethoxysilane, vinyl trimethoxysilane, and 3-acryloxypropyl trimethoxysilane.

[0008] Preferably, the specific surface area of the active silicon dioxide is 23 m 2 / g, and the purity is 98%.

[0009] Preferably, the phosphorous slag is white powder with an activity of 92%.

[0010] Preferably, the white cement is white Portland 425 cement, whiteness 85% or more.

[0011] Preferably, the industrial solid waste composite powder is slag powder, steel slag powder, water slag powder,

[0012] Preferably, the machine-made sand is medium sand, fineness modulus 2.9, bottom powder content 4% or less.

[0013] Preferably, the gravel is 0-10mm gravel, crushing value 4.7;

[0014] Preferably, the iron oxide pigment is one or more of iron oxide red, iron oxide yellow, and iron oxide green;

[0015] Preferably, the preparation process of the super-hydrophobic component is as follows:

[0016] Step one: weigh the raw materials in the super-hydrophobic component according to the mass ratio, put the acrylate, polyvinyl alcohol and sodium dodecyl benzene sulfonate into deionized water, use ammonium persulfate as initiator, control the temperature at 75-90℃, and control the reaction time at 3-4h to prepare polyvinyl alcohol-acrylate polymer.

[0017] Step two: when the temperature drops to 30-40℃, put the silane coupling agent and active silicon dioxide into the polyvinyl alcohol-acrylate polymer obtained in step one, stir uniformly and continuously at a speed of 30r / min for 120-150min, fully stir and mix evenly, and then put it into a drying box after it cools down to room temperature, dry it at 20-22℃ for 8-10h, and then take it out to obtain the super-hydrophobic solution.

[0018] Step three: put the iron oxide pigment into the solution obtained in step two, fully stir and mix evenly to obtain the super-hydrophobic component.

[0019] The preparation principle of the super-hydrophobic component is as follows: use ammonium persulfate as initiator, polyvinyl alcohol and acrylate in the solution undergo polycondensation reaction to generate polyvinyl alcohol-acrylate polymer, and in the process, sodium dodecyl benzene sulfonate generates sulfonic acid groups with both hydrophilic and hydrophobic properties in the solution, after the silane coupling agent and active silicon dioxide are put in, the solution is fully mixed and stirred, the silane coupling agent couples with the active silicon dioxide and the polyvinyl alcohol-acrylate polymer, the solution is uniformly distributed with the composite solute of dodecyl benzene sulfonic acid and silicon dioxide-polyvinyl alcohol-acrylate polymer, after drying, part of the water is evaporated, the concentration and viscosity of the super-hydrophobic solution are increased, and the iron oxide pigment is added to the super-hydrophobic solution for sufficient dyeing, thereby obtaining super-hydrophobic solutions of different colors.

[0020] Preferably, the preparation process of the phosphorous slag-based environment-friendly hydrophobic self-cleaning clear water concrete is as follows:

[0021] Step one: according to the quality ratio of each component, the good white cement, phosphorus slag, industrial solid waste composite powder, super-hydrophobic component, machine-made sand, gravel, water, and additive are weighed;

[0022] Step two: the white cement, phosphorus slag, industrial solid waste composite powder, machine-made sand, and gravel in step one are added into a stirring machine and stirred for 10-15s, and the powders and aggregates are stirred uniformly;

[0023] Step three: the water and additive in step one are added into the mixture stirred uniformly in step two, and the mixture is continuously stirred in the stirring machine for 240-300s, then the super-hydrophobic component is poured into the concrete, and stirred for 30-60s.

[0024] Step four: the concrete stirred uniformly in step three is poured into a mold, a vibrating rod is inserted into the concrete and vibrated for 30-60s, and when a colored transparent film appears on the surface of the concrete, the phosphorus slag-based environment-friendly hydrophobic self-cleaning fair-faced concrete is prepared.

[0025] The preparation principle of the phosphorus slag-based environment-friendly hydrophobic self-cleaning fair-faced concrete is as follows: after the white cement, phosphorus slag, industrial solid waste composite powder, machine-made sand, and gravel are stirred uniformly, the water and additive are added and stirred for 240-300s, at this time, the concrete is in a state of good workability, and the concrete is poured into a prepared mold, the super-hydrophobic component is added, and stirred for 30-60s, then the super-hydrophobic component is dispersed in the concrete, because the super-hydrophobic component and the concrete have poor solubility, and the density of the concrete is much greater than that of the super-hydrophobic component, under the action of the vibrating rod, the super-hydrophobic component is expelled to the periphery of the concrete, and a thin film of the super-hydrophobic component is formed on the periphery and surface layer of the concrete, after the concrete is solidified, the super-hydrophobic component is also adhered to the surface of the concrete, and after demolding, the phosphorus slag-based environment-friendly hydrophobic self-cleaning fair-faced concrete is formed.

[0026] The beneficial effects of the present application are as follows:

[0027] (1) In the present application, the amount of white cement in the concrete cementitious material is low, and the amount of phosphorus slag powder and industrial solid waste composite powder is more than 75%, the phosphorus slag powder has a certain retarding effect, reduces the early hydration heat, and the hydration heat peak generated after the hydration reaction of the industrial solid waste composite powder and the phosphorus slag powder is later than that of the white cement, further reducing the early hydration heat and greatly reducing the possibility of early cracking of the concrete, effectively ensuring the apparent quality of the concrete, and the cementitious system greatly reduces the amount of white cement, which not only effectively reduces the carbon emission of concrete production, but also further reduces the production cost of the concrete;

[0028] (2) The main components in the hydrophobic component are hexadecyl benzene sulfonic acid group and silicon dioxide-polyvinyl acetate-acrylate polymer; the hydrophobic component forms a physical "package" for the concrete after being vibrated, in the early and middle stages of the hydration reaction of the concrete, the active silicon dioxide participates in the hydration reaction of the concrete, and the gel product formed tightly connects the surface layer of the concrete and the hydrophobic layer together, at this time, the hydrophobic end of the polyvinyl acetate-acrylate polymer uniformly points to the outside of the concrete, in addition, due to the continuous hydration reaction of the concrete, the excess water in the hydrophobic component first continuously enters the interior of the concrete, the part of water plays a certain curing effect on the concrete, at the same time, as the water continuously enters the concrete, the hydrophilic end of the dodecyl benzene sulfonic acid group is directed to the interior of the concrete, and the hydrophobic end is directed to the exterior of the concrete, after the water loss, a layer of solid surface layer with super-hydrophobic effect is formed on the surface of the concrete.

[0029] (3) The iron oxide pigment is added to the hydrophobic component, and is not directly added to the concrete, which can effectively avoid the problems of strength reduction, durability reduction, surface powdering and the like caused by directly adding the pigment to the concrete, and since the iron oxide pigment does not react with the hydrophobic component, the color retention of the iron oxide pigment can be maintained, after the phosphorous slag-based environment-friendly hydrophobic self-cleaning clear concrete is completely demolded and formed, the concrete not only maintains the original strength, but also has a better bonding interface between the hydrophobic layer and the concrete, and due to the uniform orientation of the hydrophobic groups, the hydrophobic layer of the concrete has a stronger hydrophobic effect, and the surface dust and water droplets are reduced, so that the self-cleaning effect is achieved. DETAILED DESCRIPTION

[0030] The technical scheme of the present application is further described below through specific implementation examples, which are an explanation but not a limitation of the present application.

[0031] Example 1:

[0032] S1: Each component is weighed, 9 parts of silane coupling agent, 3 parts of active silicon dioxide, 264 parts of deionized water, 11 parts of acrylate, 14 parts of polyvinyl alcohol, 1 part of sodium dodecyl benzene sulfonate, 3 parts of ammonium persulfate, and 1 part of iron oxide pigment.

[0033] S2: The weighed acrylate, polyvinyl alcohol and sodium dodecyl benzene sulfonate in S1 are put into deionized water, ammonium persulfate is used as an initiator, the temperature is controlled at 75℃, and the reaction time is controlled at 4h, to prepare polyvinyl acetate-acrylate polymer;

[0034] S3: The temperature is reduced to 30℃, the silane coupling agent and the active silicon dioxide are put into the polyvinyl acetate-acrylate polymer obtained in step one, and are uniformly and continuously stirred at a speed of 30r / min for 120min, so as to be fully stirred and uniformly distributed, after being reduced to room temperature, it is put into a drying box, and is dried at 20℃ for 8h, then taken out to obtain a super-hydrophobic solution.

[0035] S4: Iron oxide pigments are put into the solution obtained in S3, and fully stirred to obtain a super-hydrophobic component.

[0036] S5: Each component is weighed according to the mass, 240 parts of phosphorus slag, 50 parts of white cement, 160 parts of industrial solid waste composite powder, 11 parts of super-hydrophobic component, 690 parts of machine-made sand, 1020 parts of gravel, 155 parts of water, and 11 parts of additive;

[0037] S6: The white cement, phosphorus slag, industrial solid waste composite powder, machine-made sand and gravel weighed in S5 according to the mass ratio of each component are added to a stirrer and stirred for 10 s, and the powders and aggregates are stirred uniformly;

[0038] S7: The water and additive weighed in S5 are added to the mixture stirred uniformly in S4, and the stirring is continued in the stirrer for 240 s. After the workability of the concrete is formed, the super-hydrophobic component is poured into the concrete and stirred for 30 s.

[0039] S8: The concrete stirred uniformly in S7 is poured into a mold, a vibrating rod is inserted into the concrete and vibrated for 30 s. When a colored transparent film appears on the surface of the concrete, a phosphorus slag-based environment-friendly hydrophobic self-cleaning clear water concrete is prepared.

[0040] Example 2:

[0041] S1: Each component is weighed according to the mass, 15 parts of silane coupling agent, 8 parts of active silicon dioxide, 293 parts of deionized water, 17 parts of acrylate, 8 parts of polyvinyl alcohol, 3 parts of sodium hexadecyl benzene sulfonate, 5 parts of ammonium persulfate, and 3 parts of iron oxide pigment.

[0042] S2: The acrylate, polyvinyl alcohol and sodium hexadecyl benzene sulfonate weighed in S1 are put into deionized water, ammonium persulfate is used as an initiator, the temperature is controlled at 90°C, and the reaction time is controlled at 3 h to prepare a polyvinyl alcohol-acrylate polymer.

[0043] S3: When the temperature drops to 40°C, the silane coupling agent and active silicon dioxide are put into the polyvinyl alcohol-acrylate polymer obtained in step one, and are uniformly and continuously stirred at a speed of 30 r / min for 150 min. After being fully stirred and uniformly, it is placed in a drying box after being cooled to room temperature, and is dried at 20°C for 10 h to obtain a super-hydrophobic solution.

[0044] S4: Iron oxide pigments are put into the solution obtained in S3, and fully stirred to obtain a super-hydrophobic component.

[0045] S5: Each component is weighed according to the mass, 140 parts of phosphorus slag, 80 parts of white cement, 120 parts of industrial solid waste composite powder, 17 parts of super-hydrophobic component, 780 parts of machine-made sand, 960 parts of gravel, 165 parts of water, and 6 parts of additive;

[0046] S6: The white cement, phosphorus slag, industrial solid waste composite powder, machine-made sand and gravel in S5 are weighed according to the mass ratio of each component, added into a stirrer and stirred for 15 s, and the powders and aggregates are stirred uniformly;

[0047] S7: The water and admixture weighed in S5 are added into the mixed material stirred uniformly in S4, and stirring in the stirrer is continued for 300 s; after the workability of the concrete is formed, the super-hydrophobic component is poured into the concrete, and stirring is continued for 60 s.

[0048] S8: The concrete stirred uniformly in S7 is poured into a mold, a vibrating rod is inserted into the concrete and vibrated for 60 s, and thus the phosphorus slag-based environment-friendly hydrophobic self-cleaning clear water concrete is prepared.

[0049] Example 3:

[0050] S1: The components are weighed according to the mass ratio, 12 parts of silane coupling agent, 6 parts of active silicon dioxide, 276 parts of deionized water, 14 parts of acrylate, 12 parts of polyvinyl alcohol, 2 parts of sodium hexadecyl benzene sulfonate, 4 parts of ammonium persulfate and 2 parts of iron oxide pigment.

[0051] S2: The acrylate, polyvinyl alcohol and sodium hexadecyl benzene sulfonate weighed in S1 are poured into deionized water, ammonium persulfate is used as an initiator, the temperature is controlled at 82 ℃, and the reaction time is controlled at 2.5 h, and thus the polyvinyl alcohol-acrylate polymer is prepared.

[0052] S3: When the temperature drops to 35 ℃, the silane coupling agent and active silicon dioxide are poured into the polyvinyl alcohol-acrylate polymer obtained in step one, and uniform stirring is continued at a speed of 30 r / min for 135 min, so that the stirring is fully and uniformly, and then the super-hydrophobic solution is obtained after being placed in a drying box and dried at 21 ℃ for 9 h.

[0053] S4: The iron oxide pigment is poured into the solution obtained in S3, and fully stirred and uniformly, and thus the super-hydrophobic component is obtained.

[0054] S5: The components are weighed according to the mass ratio, 190 parts of phosphorus slag, 65 parts of white cement, 140 parts of industrial solid waste composite powder, 14 parts of super-hydrophobic component, 780 parts of machine-made sand, 960 parts of gravel, 160 parts of water and 8 parts of admixture.

[0055] S6: The white cement, phosphorus slag, industrial solid waste composite powder, machine-made sand and gravel in S5 are weighed according to the mass ratio of each component, added into a stirrer and stirred for 12 s, and the powders and aggregates are stirred uniformly;

[0056] S7: The water and admixture weighed in S5 are added into the mixed material stirred uniformly in S4, and stirring in the stirrer is continued for 270 s; after the workability of the concrete is formed, the super-hydrophobic component is poured into the concrete, and stirring is continued for 45 s.

[0057] S8: Pour the well-mixed concrete in S7 into the mold, and insert a vibrating rod into the concrete for 45 s of continuous vibration, thus obtaining the phosphorous slag-based environment-friendly hydrophobic self-cleaning fair-faced concrete.

[0058] Comparative Example 1:

[0059] The difference between this comparative example and Example 3 is that, in step S7, no super-hydrophobic component is added;

[0060] Comparative Example 2:

[0061] The difference between this comparative example and Example 3 is that, in step S4, the iron oxide pigment is not added to the hydrophobic solution in step S3; and in step S6, the iron oxide pigment is weighed and stirred together with the other components;

[0062] Comparative Example 3:

[0063] The difference between this comparative example and Example 3 is that, in step S7, the super-hydrophobic component is not poured into the concrete; and in S8, the super-hydrophobic component is sprayed on the hardened surface of the concrete after the concrete is hardened and demolded;

[0064] Comparative Example 4:

[0065] The difference between this comparative example and Example 3 is that, in step S7, no super-hydrophobic component in the present patent is added, and a silicone hydrophobic agent is poured instead.

[0066] Performance test: The compressive strength, peeling strength, apparent mass, and self-cleaning performance of the phosphorous slag-based environment-friendly hydrophobic self-cleaning fair-faced concrete prepared in Examples 1-3 and Comparative Examples 1-4 after 28 d of curing are tested. The self-cleaning performance test method is to evenly smear 0.75 um or smaller dust on the surface of the test block, and then use a spraying device to simulate rainwater washing, and then calculate the ratio of the smooth area to the residual dust area. The performance test results are as follows:

[0067] Table 1: Concrete performance test results

[0068]

[0069] Data analysis: As can be seen from Examples 1-3, the phosphorus slag-based environment-friendly hydrophobic self-cleaning fair-faced concrete prepared by the present application covers multiple different strength grades of concrete, and when each raw material is changed within the design range, the phosphorus slag-based environment-friendly hydrophobic self-cleaning fair-faced concrete always maintains good self-cleaning performance and apparent quality, and all have relatively high peel strength, which increases with the increase of the strength grade of the concrete. As can also be known from Comparative Examples 1-4, the use of the super-hydrophobic agent prepared by the present application has relatively great improvement in peel strength, self-cleaning performance and apparent quality without affecting the compressive strength. Moreover, the present application uses phosphorus slag and industrial solid waste composite powder as raw materials, realizes the recycling of bulk industrial solid waste in application after recycling, reduces the addition amount of cement, reduces carbon emissions in the concrete production process, and meets the green and low-carbon environmental protection requirements.

[0070] The above is only an example and description of the structure of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace, as long as the modifications or supplements do not deviate from the structure of the present application or exceed the scope defined by the present claims, and should belong to the protection scope of the present application.

Claims

1. A phosphorous slag-based environment-friendly self-cleaning clear water concrete, characterized in that, The raw material components are in a mass ratio of 140-240 parts of phosphorus slag, 50-80 parts of white cement, 120-160 parts of industrial solid waste composite powder, 11-17 parts of super-hydrophobic component, 690-780 parts of machine-made sand, 960-1020 parts of gravel, 155-165 parts of water, and 6-11 parts of additive; The components in the super-hydrophobic component are in a mass ratio of 9-15 parts of silane coupling agent, 3-8 parts of active silicon dioxide, 264-293 parts of deionized water, 11-17 parts of acrylate, 8-14 parts of polyvinyl alcohol, 1-3 parts of sodium hexadecyl benzene sulfonate, 3-5 parts of ammonium persulfate, and 1-3 parts of iron oxide pigment; The super-hydrophobic component is prepared as follows: Step one: the raw materials for the super-hydrophobic component are weighed according to the mass ratio, and the acrylate, polyvinyl alcohol, and sodium hexadecyl benzene sulfonate are added to the deionized water, with ammonium persulfate as the initiator, the temperature is controlled at 75-90°C, and the reaction time is controlled at 3-4 hours to prepare the polyvinyl alcohol-acrylate polymer; Step two: when the temperature drops to 30-40°C, the silane coupling agent and active silicon dioxide are added to the polyvinyl alcohol-acrylate polymer obtained in step one, and uniform stirring is continued at a speed of 30 r / min for 120-150 minutes to fully stir and mix evenly, and then the temperature is reduced to room temperature for storage; Step three: the iron oxide pigment is added to the solution obtained in step two, and fully stirred and mixed evenly to obtain the super-hydrophobic component.

2. The phosphorous-slag-based eco-friendly hydrophobic self-cleaning clear concrete according to claim 1, characterized in that, The silane coupling agent is one or more of vinyl triethoxysilane, acetyl trimethoxysilane, vinyl trimethoxysilane, and 3-acryloxypropyl trimethoxysilane.

3. The phosphorous-slag-based eco-friendly hydrophobic self-cleaning clear concrete according to claim 1, characterized in that, The active silica has a specific surface area of 23 m 2 / g, purity 98%.

4. The phosphorous-slag-based eco-friendly hydrophobic self-cleaning clear concrete according to claim 1, characterized in that, The white cement is white Portland cement 425 with a whiteness of 85% or more.

5. The phosphorus slag-based environmentally friendly hydrophobic self-cleaning concrete according to claim 1, characterized in that, The industrial solid waste composite powder is slag powder, steel slag powder, and water slag powder.

6. The phosphorus slag-based environmentally friendly hydrophobic self-cleaning concrete according to claim 1, characterized in that, The machine-made sand is medium sand with a fineness modulus of 2.9 and a bottom powder content of 4% or less, and the gravel is 0-10 mm gravel with a crushing value of 4.

7.

7. The phosphorus slag-based environmentally friendly hydrophobic self-cleaning concrete according to claim 1, characterized in that, The preparation process of the phosphorus slag-based environment-friendly hydrophobic self-cleaning clear water concrete is as follows: Step one: the white cement, phosphorus slag, industrial solid waste composite powder, super-hydrophobic component, machine-made sand, gravel, water, and additive are weighed according to the mass ratio of each component; Step two: the white cement, phosphorus slag, industrial solid waste composite powder, machine-made sand, and gravel weighed according to the mass ratio of each component in step one are added to the mixer and stirred for 10-15 seconds to uniformly stir and mix the powders and aggregates; Step three: the water and additive weighed according to the mass ratio of each component in step one are added to the uniformly stirred mixture in step two, and the stirring in the mixer is continued for 240-300 seconds, after which the super-hydrophobic component is poured into the concrete and stirred for 30-60 seconds; Step four: the uniformly stirred concrete in step three is poured into a mold, a vibrating rod is inserted into the concrete and continuously vibrated for 30-60 seconds, and when a colored transparent film appears on the surface of the concrete, the phosphorus slag-based environment-friendly hydrophobic self-cleaning clear water concrete is prepared.

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