Dry-mixed fine sand color concrete and its construction method

Abstract

The present invention discloses a dry-mix fine sand color concrete and a construction method thereof, which belongs to the technical field of materials chemistry. The dry-mix fine sand color concrete contains, based on the total mass of the dry-mix fine sand color concrete, 20-35 mass% cement, 5-25 mass% solid industrial waste, 35-60 mass% fine sand, 1-2.2 mass% modified polypropylene fiber, 0.5-1.2 mass% cellulose ether, and 0.1-10 mass% pigment. The dry-mix fine sand color concrete described in the present invention has excellent strength, low slump loss, no bleeding or material separation, and a wide range of applications. The color concrete also has high color stability and is resistant to fading.

Description

[Technical Field]

[0001] The present invention relates to the technical field of materials chemistry, and more particularly to a dry-mix type fine sand color concrete and a construction method thereof. [Background technology]

[0002] Cast-in-place colored concrete differs from conventional concrete in that it can enhance the decorative properties of concrete while eliminating the need for secondary decoration. Therefore, there has been an increase in finishing work using new functional materials that are decorative, energy-efficient, and environmentally friendly. Colored concrete can significantly enrich the color of pavements, blending naturally with urban buildings and the surrounding environment, and beautifying the urban environment. However, there is still a need to improve the strength of conventional colored concrete.

[0003] Chinese Patent Publication No. 109809755 discloses a colored concrete containing a pigment composition containing red iron oxide, ground calcium carbonate, epoxidized soybean oil, fumed silica, and polyoxyethylene ether, and a method for producing the same. The pigment composition contains red iron oxide as a pigment mixture, which improves the durability of the red iron oxide and makes it less likely to fade. As can be seen from this, this technology requires the pigment to undergo a specific mixing treatment. Furthermore, the compressive strength of the resulting concrete is still low, and there is still a need to improve the compressive strength.

[0004] Chinese Patent Publication No. 104478352 discloses a colored concrete containing an epoxy resin and a coupling agent, and a method for producing the same. The weight of the epoxy resin is 10-20% of the weight of the cement, and the weight of the coupling agent is 0.05-0.1% of the weight of the cement. In this technology, the addition of the coupling agent ensures that the color of the colored concrete is well-maintained and resistant to fading. It also improves the weather resistance of the product, allowing the color to remain vibrant for a long period of time. The addition of the epoxy resin also improves the abrasion resistance of the concrete surface, as well as the corrosion and water resistance of the product, thereby extending its lifespan. However, the coupling agent is prone to decomposition in outdoor environments, especially in the presence of water, which affects the color stability of the colored concrete and results in insufficient slump retention.

[0005] Therefore, providing a concrete that can achieve both strength and slump retention has become an urgent issue that must be resolved by those skilled in the art. Summary of the Invention

[0006] An object of the present invention is to provide a dry-mix type fine sand color concrete which overcomes the drawbacks of the prior art and has excellent strength and little slump loss, and a method for constructing the same.

[0007] In order to achieve the above object, a first aspect of the present invention provides a dry-mix type fine sand color concrete, which contains, based on the total mass of the dry-mix type fine sand color concrete, 20 to 35 mass% cement, 10 to 25 mass% solid industrial waste, 35 to 60 mass% fine sand, 1 to 2.2 mass% modified polypropylene fiber, 0.5 to 1.2 mass% cellulose ether, and 0.1 to 10 mass% pigment.

[0008] In a preferred embodiment of the present invention, the dry-mix fine sand color concrete contains, based on the total mass of the dry-mix fine sand color concrete, 27 to 33 mass% cement, 15 to 22 mass% solid industrial waste, 42 to 52 mass% fine sand, 1 to 2.2 mass% modified polypropylene fiber, 0.5 to 1.2 mass% cellulose ether, and 0.1 to 0.8 mass% pigment.

[0009] In a preferred embodiment of the present invention, the dry-mix fine sand color concrete contains, based on the total mass of the dry-mix fine sand color concrete, 30 to 32 mass% cement, 18 to 21 mass% solid industrial waste, 43 to 48 mass% fine sand, 1.2 to 1.8 mass% modified polypropylene fiber, 0.8 to 1.2 mass% cellulose ether, and 0.2 to 0.6 mass% pigment.

[0010] In a preferred embodiment of the present invention, the dry-mix fine sand color concrete contains 30% by mass of cement, 20% by mass of solid industrial waste, 36% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of cellulose ether, 0.4% by mass of pigment, and 10% by mass of water, based on the total mass of the dry-mix fine sand color concrete.

[0011] In a preferred embodiment of the present invention, the fine sand has a coarse particle ratio of 5 mm or less.

[0012] In a preferred embodiment of the present invention, the cement is any one of white Portland cement and ordinary Portland cement.

[0013] In a preferred embodiment of the present invention, the pigment comprises at least one selected from the group consisting of titanium dioxide, iron oxide, burnt ochre, iron oxide brown, chromium oxide, chromium hydroxide, cobalt oxide, yellow iron oxide, and red iron oxide.

[0014] In a preferred embodiment of the present invention, the solid industrial waste includes at least one selected from the group consisting of blast furnace slag, steel slag, red mud, coal cinders, pyrite cinder, gypsum, desulfurization residues, and carbide slag.

[0015] In a preferred embodiment of the present invention, the solid industrial waste contains gypsum and / or blast furnace slag.

[0016] In a preferred embodiment of the present invention, the mass ratio of the gypsum to the blast furnace slag is (0.5 to 2:1).

[0017] In a preferred embodiment of the present invention, the mass ratio of the gypsum to the blast furnace slag is 1:1.

[0018] In a preferred embodiment of the present invention, the method for producing the modified polypropylene fiber includes:

[0019] A step of subjecting polypropylene fibers to plasma pretreatment to obtain pretreated polypropylene fibers;

[0020] adding sodium alginate to water and stirring until uniform to obtain mixture A; adding pretreated polypropylene fibers to mixture A and stirring until uniform to obtain mixture B; then adding calcium chloride to mixture B and stirring until uniform to obtain mixture C; and ultrasonically treating and drying mixture C to obtain modified polypropylene fibers;

[0021] In a preferred embodiment of the present invention, the mass ratio of sodium alginate, pretreated polypropylene fibers, and calcium chloride is (0.5 to 2):1:(0.1 to 0.4).

[0022] In a preferred embodiment of the present invention, the mass ratio of sodium alginate, pretreated polypropylene fibers, and calcium chloride is 1:1:0.2.

[0023] In a preferred embodiment of the present invention, the plasma treatment is carried out at a voltage of 220 V, with an output of 500 to 1000 W, for a period of 1 to 10 minutes.

[0024] In a preferred embodiment of the present invention, the polypropylene fibers have a length of 20 to 60 mm.

[0025] In a preferred embodiment of the present invention, the dry-mix fine sand color concrete further contains 0.4 to 0.8 mass % of a grinding aid, preferably 0.5 to 0.8 mass %, and most preferably 0.6 mass % of a grinding aid, based on the total mass of the dry-mix fine sand color concrete.

[0026] The grinding aid contains triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is (3-6):(1-4):(1-3).

[0027] In a preferred embodiment of the present invention, the mass ratio of triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 5:3:2.

[0028] In a second aspect of the present invention, the present invention provides a method for producing a medicament for a medicament comprising:

[0029] Mixing the cement, solid industrial waste, fine sand, and cellulose ether uniformly to obtain a dry material;

[0030] Adding modified polypropylene fiber to the dry material and stirring until uniform to obtain mixture D, further adding pigment and grinding aid to mixture D and stirring until uniform to obtain mixture E, and grinding mixture E in a ball mill to obtain concrete mixtures;

[0031] Filling the concrete mixture into a formwork, and after the concrete mixture has hardened, removing the formwork and curing the concrete to obtain a dry-mix fine sand color concrete;

[0032] The present invention provides a method for producing dry-mix fine sand color concrete, comprising:

[0033] In a third aspect of the present invention, there is provided a method for constructing dry-mixed fine sand color concrete, which includes the steps of mixing water and dry-mixed fine sand color concrete and stirring them to make them uniform, applying the uniformly stirred slurry to a wall surface using a pump or by hand, or pouring it into a casting location, allowing it to dry naturally, and then performing self-leveling, troweling, or polishing.

[0034] The beneficial effects of the present invention are as follows: (1) The dry-mix fine sand color concrete described in the present invention has excellent strength, low slump loss, no bleeding or material separation, and a wide range of applications. Furthermore, the color concrete has high color stability and is resistant to fading. (2) The present invention rationally designs the blending ratios of cement, solid industrial waste, and fine sand, allowing these three components to be well-integrated as the main raw materials, effectively controlling the carbonization reaction process, achieving optimal bulk density of the matrix structure, improving skeletal stack strength, and ensuring carbonization of the components, effectively improving overall strength and reducing slump loss. Furthermore, in the system of the present invention, the pigment can be uniformly dispersed, resulting in good color uniformity, high color stability, and resistance to fading. DETAILED DESCRIPTION OF THE INVENTION

[0035] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below, but it is clear that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be obtained by those skilled in the art based on the embodiments of the present invention without any creative work fall within the protection scope of the present invention.

[0036] In the present invention, technical features described in an open-ended manner include closed-ended technical solutions consisting of the recited features, but also open-ended technical solutions including the recited features.

[0037] In the present invention, unless otherwise specified, a numerical range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when a range refers to integers, every integer between the minimum and maximum values ​​of the range is included. Furthermore, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include all subranges subsumed therein.

[0038] In the present invention, the specific dispersion and stirring treatment methods are not particularly limited.

[0039] Reagents and instruments used in the present invention for which the manufacturer is not specified are all commercially available products.

[0040] An embodiment of the present invention provides a dry-mix fine sand color concrete containing, based on the total mass of the dry-mix fine sand color concrete, 20 to 35 mass% cement, 10 to 25 mass% solid industrial waste, 35 to 60 mass% fine sand, 1 to 2.2 mass% modified polypropylene fiber, 0.5 to 1.2 mass% cellulose ether, and 0.1 to 10 mass% pigment.

[0041] In one embodiment, the dry-mix fine sand color concrete of the present invention contains, based on the total mass of the dry-mix fine sand color concrete, 27-33 mass% cement, 15-22 mass% solid industrial waste, 42-52 mass% fine sand, 1-2.2 mass% modified polypropylene fiber, 0.5-1.2 mass% cellulose ether, and 0.1-0.8 mass% pigment. In the present invention, by combining these ingredients in specific proportions, a dry-mix fine sand color concrete with excellent strength and low slump loss can be obtained. The dry-mix fine sand color concrete does not suffer from bleeding or material separation, has a wide range of applications, has high color stability, and is resistant to fading.

[0042] In the present invention, by rationally designing the blending ratio of cement, solid industrial waste, and fine sand, these three can be well stacked as the main raw materials, effectively controlling the carbonization reaction process, achieving the optimal bulk density of the matrix structure, improving the skeletal pile strength, and ensuring the carbonization of the components, thereby effectively improving the overall strength and slump retention.

[0043] In the system of the present invention, the pigment can be dispersed uniformly, with good color uniformity, high color stability, and resistance to fading.

[0044] Here, the incorporation of cellulose ether can increase the viscosity of the system, preventing material separation and imparting a certain water retention effect.

[0045] Furthermore, the inventors have found that, since the blending amount of each raw material has a significant impact on the effect of the present invention, when the blending amount of each raw material is controlled within the range of the present invention, the compatibility of the entire blend system is good, stability is excellent, skeletal deposit strength is high, and the strength and slump loss are reduced, whereas when the blending amount of each raw material deviates from the range of the present invention, the strength decreases, the slump loss increases, or both the strength and slump decrease. Therefore, in the present invention, it is necessary to strictly control the blending amount of each raw material.

[0046] The present inventors first attempted to modify polypropylene fibers with a conventional silane coupling agent, but as a result, they found that modification with a conventional silane coupling agent can improve the dispersion effect to some extent, but the degree of improvement is limited.

[0047] In one embodiment, the dry-mix fine sand color concrete of the present invention contains, based on the total mass of the dry-mix fine sand color concrete, 30-32 mass% cement, 18-21 mass% solid industrial waste, 43-48 mass% fine sand, 1.2-1.8 mass% modified polypropylene fiber, 0.8-1.2 mass% cellulose ether, and 0.2-0.6 mass% pigment. In particular, these blending amounts improve strength and slump.

[0048] In one embodiment, the dry-mix fine sand color concrete of the present invention contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of cellulose ether, and 0.4% by mass of pigment, based on the total mass of the dry-mix fine sand color concrete. In particular, this blending amount improves strength and slump.

[0049] In one embodiment, the fine sand has a coarseness ratio of 5 mm or less. By using fine sand with a coarseness ratio of 5 mm or less, its specific surface area is large, which can effectively fill pores, improve the overall skeletal density, and form a denser system.

[0050] In one embodiment, the cement is one selected from white Portland cement and ordinary Portland cement. The dry-mix fine sand color concrete of the present invention is applied to Portland cement systems.

[0051] Here, both white Portland cement and ordinary Portland cement are common commercial products in the field.

[0052] In one embodiment, the pigment comprises at least one selected from the group consisting of titanium dioxide, iron oxide, burnt ochre, brown iron oxide, chromium oxide, chromium hydroxide, cobalt oxide, yellow iron oxide, and red iron oxide. In the present invention, the pigment can be added directly. Because the system of the present invention has various functional groups, pre-dispersion or pre-modification of the pigment is not required, making it easy to disperse the pigment.

[0053] In one embodiment, the solid industrial waste comprises at least one of blast furnace slag, steelmaking slag, red mud, coal ash, sulfuric acid slag, gypsum, desulfurization sludge, and carbide slag. By utilizing solid industrial waste as a main raw material, the present invention can effectively reduce the burden of solid waste accumulation and turn waste into treasure.

[0054] In one embodiment, the solid industrial waste contains gypsum and / or blast furnace slag, and preferably, the mass ratio of the gypsum to the blast furnace slag is (0.5 to 2): 1. In particular, when gypsum and blast furnace slag are used as the main raw materials, the compatibility and suitability with the present invention are improved, and in addition to exhibiting an excellent filling volume increase effect, a water-reducing effect is obtained, the shear yield stress in the mixing process is reduced, and the fluidity of the concrete mixture is improved. Furthermore, the tensile force between each component in the mixing process can be improved, preventing settling and sliding of the main raw materials, and further improving the strength and slump retention of the system.

[0055] In one embodiment, the mass ratio of the gypsum to the blast furnace slag is 1:1.

[0056] In a preferred embodiment, the gypsum and the blast furnace slag have a particle size of 800 to 2000 mesh.

[0057] In one embodiment, the cellulose ether comprises at least one of hydroxypropyl methylcellulose ether, hydroxyethyl methylcellulose ether.

[0058] The inventors first tried adding polypropylene fibers directly. However, they found that due to their fiber properties, polypropylene fibers were poorly dispersed and did not function well in the system of the present invention, limiting the effect of improving strength and slump retention. Therefore, modification of polypropylene fibers was necessary.

[0059] In one embodiment, the method for producing the modified polypropylene fibers comprises:

[0060] A step of subjecting polypropylene fibers to plasma pretreatment to obtain pretreated polypropylene fibers;

[0061] adding sodium alginate to water and stirring until uniform to obtain mixture A; adding pretreated polypropylene fibers to mixture A and stirring until uniform to obtain mixture B; then adding calcium chloride to mixture B and stirring until uniform to obtain mixture C; and ultrasonically treating and drying mixture C to obtain modified polypropylene fibers;

[0062] Includes:

[0063] In one embodiment, the mass ratio of the sodium alginate, the pretreated polypropylene fibers, and the calcium chloride is (0.5 to 2):1:(0.1 to 0.4).

[0064] In the present invention, polypropylene fibers are creatively treated with plasma, and various functional groups (e.g., hydroxyl groups, ester groups) are formed on the surface of the polypropylene fibers through the action of the plasma, providing sites for subsequent reactions and facilitating subsequent grafting, thereby allowing the modified polypropylene fibers to be well dispersed in the system. In the present invention, the polypropylene fibers are directly added to the system as modified polypropylene fibers, which effectively strengthens the system. The modified polypropylene fibers form a disordered three-dimensional network structure with the main raw materials, effectively improving the tensile forces between the components during concrete mixing and preventing the main raw materials from settling or slipping. Furthermore, the dispersion effect in the mix is ​​high, preventing the occurrence of agglomeration, avoiding the introduction of pores and defects due to agglomeration, and improving the stability of the overall mix.

[0065] The present inventors have found that the use of the modified polypropylene fiber of the present invention provides superior effects and can more significantly improve strength and slump retention compared to the use of polypropylene fiber.

[0066] In one embodiment, the mass ratio of sodium alginate to pretreated polypropylene fibers to calcium chloride is 1:1:0.2.

[0067] In one embodiment, the plasma treatment has a voltage of 220 V, an output of 500 to 1000 W, and a duration of 1 to 10 minutes.

[0068] The plasma treatment is carried out in a conventional plasma reactor.

[0069] In one embodiment, the polypropylene fibers have a length of 20 to 60 mm.

[0070] In a preferred embodiment of the present invention, the dry-mix fine sand color concrete further contains 0.4 to 0.8 mass % of a grinding aid, preferably 0.5 to 0.8 mass %, and most preferably 0.6 mass % of a grinding aid, based on the total mass of the dry-mix fine sand color concrete.

[0071] In one embodiment, the grinding aid comprises triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate to the sodium methanesulfonate to the hydrolyzed sclerotium gum is (3-6):(1-4):(1-3).

[0072] Here, the grinding aid has good compatibility with the system, and can further improve the strength of the system and further reduce slump loss.

[0073] The grinding aid of the present invention creatively combines triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, which reduces the surface tension of concrete mixtures, reduces air bubbles in the concrete, improves the smoothness of the concrete surface, and reduces grinding resistance. It also improves the cement hydration environment, forming multiple active bonds on the cement particle surface, which then adsorbs orientably to the cement particle surface, improving the dispersion effect of pigments and other materials that tend to aggregate. It also prevents water diffusion and penetration, providing excellent water retention, thereby delaying cement hydration. The grinding aid described in the present invention also has good system compatibility and excellent stability, effectively improving strength and slump retention. Furthermore, the grinding aid of the present invention has resistance to moisture caking and can improve the fluidity of pigments and cement, resulting in a uniform, stable, and fade-resistant color.

[0074] More specifically, the hydrolyzed sclerotium gum is a nonionic, salt-tolerant biopolysaccharide polymer with a β-1,3-D-glucopyranose main chain and one β-1,6-glucopyranose side chain for every three glucose molecules. Due to its high hydroxyl group content, it has excellent compatibility with the system, can improve the system stability, has excellent water retention effect, improves the hydration environment of cement, and can form a three-dimensional network structure, effectively improving bleeding and alkalinization phenomena.

[0075] The triethanolamine borate can improve the hydration and setting speed of cement, thereby adjusting the thickening speed of the mixture, delaying the hydration reaction, and improving the hydration environment of the cement. At the same time, it has a chelating effect, chelating metal ions and neutralizing some of the electrostatic ions generated by frictional electricity, thereby reducing the electrostatic adsorption phenomenon. As a result, more hydration products are produced in the cement at an early stage, reducing voids, thereby improving the bleeding resistance of the cement and imparting early strength.

[0076] The sodium methanesulfonate has a small molecular weight and can be well adsorbed on the surface of the skeletal material during the kneading process, thereby reducing the surface free energy, reducing the aggregation phenomenon of the skeletal material, and improving the dispersion effect of the skeletal material. It can also improve the particle dispersibility and the grinding effect of the grinding aid during the cement clinker grinding process, thereby improving the efficiency of the grinding process and reducing the energy consumption in the grinding process.

[0077] The inventors have found that the strength and slump retention improving effect of the grinding aid is due to the synergistic action of the three components: triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum; when these three components are combined, they have a complementary and synergistic interaction; whereas, increasing, decreasing, or substituting any one component in the grinding aid has a significant effect on the strength and slump retention of the produced concrete.

[0078] The inventors further investigated the effect of the mass ratio of these three components on the effectiveness and found the following: Specifically, if the amount of hydrolyzed sclerotium gum is too high, the viscosity of the material becomes too high, resulting in poor fluidity and poor mixing efficiency. Conversely, if the amount is too low, bleeding and alkalization occur, limiting the effect of improving system stability. Furthermore, if the amount of triethanolamine borate is too low, the improvement effect is limited. Conversely, if the amount is too high, the framework material particles aggregate excessively, increasing the porosity during particle deposition. Furthermore, if the amount of sodium methanesulfonate is too low, the improvement effect is limited. Conversely, if the amount is too high, the amounts of hydrolyzed sclerotium gum and triethanolamine borate are reduced, resulting in reduced effectiveness. Therefore, in the present invention, it is necessary to strictly control the mass ratio of triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum.

[0079] In a preferred embodiment, the mass ratio of triethanolamine borate to sodium methanesulfonate to hydrolyzed sclerotium gum is 5:3:2, which provides improved effectiveness, strength, and slump retention.

[0080] One embodiment of the present invention comprises:

[0081] Mixing the cement, solid industrial waste, fine sand, and cellulose ether to a uniform level to obtain a dry material;

[0082] Adding modified polypropylene fiber to the dry material and stirring until uniform to obtain mixture D, further adding pigment and grinding aid to mixture D and stirring until uniform to obtain mixture E, and grinding mixture E in a ball mill to obtain a concrete mixture;

[0083] Filling the concrete mixture into a formwork, and after the concrete mixture has hardened, removing the formwork and curing the concrete to obtain a dry-mix fine sand color concrete;

[0084] The present invention provides a method for producing a dry-mix fine sand color concrete, comprising:

[0085] In the manufacturing method of colored concrete, the mixing and stirring method is not particularly limited as long as uniform stirring and mixing is achieved.

[0086] One embodiment of the present invention provides a method for constructing dry-mixed fine sand color concrete, which includes the following steps: mixing water and dry-mixed fine sand color concrete until uniform, pouring the uniformly mixed slurry into the casting site by pump or manually, spreading it evenly, self-leveling or troweling it, and then allowing it to harden.

[0087] The following examples are provided to facilitate understanding of the present invention, but are not intended to limit the scope of the claims. Example 1

[0088] The dry-mix fine sand color concrete according to this example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0089] The cement used here is Meien's P.W42.5 grade white Portland cement.

[0090] Here, fine sand has a coarse particle ratio of 5 mm or less.

[0091] Here, the solid industrial waste contains 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of the gypsum to the blast furnace slag is 1:1.

[0092] Here, the grinding aid contains triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 5:3:2.

[0093] Here, the method for producing modified polypropylene fibers included the following steps:

[0094] (1) Polypropylene fibers with a diameter of 0.1 mm and a length of 50 mm were placed in a plasma reactor and treated for 5 minutes at a voltage of 220 V, room temperature and normal pressure (1 atmosphere), and an output of 800 W. After that, the fibers were removed to obtain pretreated polypropylene fibers.

[0095] (2) 10 parts by mass of sodium alginate was added to 40 parts by mass of water and stirred at 500 rpm for 30 minutes, after which 10 parts by mass of pretreated polypropylene fiber was added and stirred at 500 rpm for 30 minutes, and then 2 parts by mass of calcium chloride was added and stirred at 500 rpm for 1 hour, followed by ultrasonic treatment at 800 W for 20 minutes and drying to obtain modified polypropylene fiber.

[0096] Here, the manufacturing method of dry-mix fine sand color concrete includes the following steps:

[0097] (11) Cement, solid industrial waste, fine sand, and hydroxypropyl methylcellulose ether were mixed at 500 rpm for 10 minutes to obtain a dry material.

[0098] (12) Modified polypropylene fiber was added to the dry material and stirred at 1000 rpm for 10 minutes, after which red iron oxide and grinding aid were further added, stirred at 800 rpm for 10 minutes, and then ball milled at 600 rpm for 8 minutes to obtain a concrete mixture.

[0099] (13) This concrete mixture was filled into a formwork, hardened, and then the formwork was removed and cured to obtain a dry-mix fine sand color concrete. Example 2

[0100] The dry-mix fine sand color concrete of this example contains 32.1% by mass of cement, 22% by mass of solid industrial waste, 42% by mass of fine sand, 2.2% by mass of modified polypropylene fiber, 0.5% by mass of hydroxypropyl methylcellulose ether, 0.4% by mass of grinding aid, and 0.8% by mass of red iron oxide.

[0101] The cement used here is Meien's P.W42.5 grade white Portland cement.

[0102] Here, fine sand has a coarse particle ratio of 5 mm or less.

[0103] Here, the solid industrial waste contains 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of the gypsum to the blast furnace slag is 1:1.

[0104] Here, the grinding aid contains triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 5:3:2.

[0105] Here, the method for producing modified polypropylene fibers included the following steps:

[0106] (1) Polypropylene fibers with a diameter of 0.1 mm and a length of 50 mm were placed in a plasma reactor and treated for 5 minutes at a voltage of 220 V, room temperature and normal pressure (1 atmosphere), and an output of 800 W. After that, the fibers were removed to obtain pretreated polypropylene fibers.

[0107] (2) 10 parts by mass of sodium alginate was added to 40 parts by mass of water and stirred at 500 rpm for 30 minutes, after which 10 parts by mass of pretreated polypropylene fiber was added and stirred at 500 rpm for 30 minutes, and then 2 parts by mass of calcium chloride was added and stirred at 500 rpm for 1 hour, followed by ultrasonic treatment at 800 W for 20 minutes and drying to obtain modified polypropylene fiber.

[0108] Here, the manufacturing method of dry-mix fine sand color concrete includes the following steps:

[0109] (11) Cement, solid industrial waste, fine sand, and hydroxypropyl methylcellulose ether were mixed at 500 rpm for 10 minutes to obtain a dry material.

[0110] (12) Modified polypropylene fiber was added to the dry material and stirred at 1000 rpm for 10 minutes, after which red iron oxide and grinding aid were further added, stirred at 800 rpm for 10 minutes, and then ball milled at 600 rpm for 8 minutes to obtain a concrete mixture.

[0111] (13) This concrete mixture was filled into a formwork, hardened, and then the formwork was removed and cured to obtain a dry-mix fine sand color concrete. Example 3

[0112] The dry-mix fine sand color concrete of this example contains 29.8% by mass of cement, 15% by mass of solid industrial waste, 52% by mass of fine sand, 1% by mass of modified polypropylene fiber, 1.2% by mass of hydroxypropyl methylcellulose ether, 0.8% by mass of grinding aid, and 0.2% by mass of red iron oxide.

[0113] The cement used here is Meien's P.W42.5 grade white Portland cement.

[0114] Here, fine sand has a coarse particle ratio of 5 mm or less.

[0115] Here, the solid industrial waste contains 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of the gypsum to the blast furnace slag is 1:1.

[0116] Here, the grinding aid contains triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 5:3:2.

[0117] Here, the method for producing modified polypropylene fibers included the following steps:

[0118] (1) Polypropylene fibers with a diameter of 0.1 mm and a length of 50 mm were placed in a plasma reactor and treated for 5 minutes at a voltage of 220 V, room temperature and normal pressure (1 atmosphere), and an output of 800 W. After that, the fibers were removed to obtain pretreated polypropylene fibers.

[0119] (2) 10 parts by mass of sodium alginate was added to 40 parts by mass of water and stirred at 500 rpm for 30 minutes, after which 10 parts by mass of pretreated polypropylene fiber was added and stirred at 500 rpm for 30 minutes, and then 2 parts by mass of calcium chloride was added and stirred at 500 rpm for 1 hour, followed by ultrasonic treatment at 800 W for 20 minutes and drying to obtain modified polypropylene fiber.

[0120] Here, the manufacturing method of dry-mix fine sand color concrete includes the following steps:

[0121] (11) Cement, solid industrial waste, fine sand, and hydroxypropyl methylcellulose ether were mixed at 500 rpm for 10 minutes to obtain a dry material.

[0122] (12) Modified polypropylene fiber was added to the dry material and stirred at 1000 rpm for 10 minutes. After that, red iron oxide and grinding aid were further added, and the mixture was stirred at 800 rpm for 10 minutes and then ball milled at 600 rpm for 8 minutes to obtain a concrete mixture.

[0123] (13) This concrete mixture was filled into a formwork, hardened, and then the formwork was removed and cured to obtain a dry-mix fine sand color concrete. Example 4

[0124] The dry-mix fine sand color concrete of this example contains 30.5% by mass of cement, 18% by mass of solid industrial waste, 48% by mass of fine sand, 1.2% by mass of modified polypropylene fiber, 1.2% by mass of hydroxypropyl methylcellulose ether, 0.7% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0125] The cement used here is Meien's P.W42.5 grade white Portland cement.

[0126] Here, fine sand has a coarse particle ratio of 5 mm or less.

[0127] Here, the solid industrial waste contains 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of the gypsum to the blast furnace slag is 1:1.

[0128] Here, the grinding aid contains triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 5:3:2.

[0129] Here, the method for producing modified polypropylene fibers included the following steps:

[0130] (1) Polypropylene fibers with a diameter of 0.1 mm and a length of 50 mm were placed in a plasma reactor and treated for 5 minutes at a voltage of 220 V, room temperature and normal pressure (1 atmosphere), and an output of 800 W. After that, the fibers were removed to obtain pretreated polypropylene fibers.

[0131] (2) 10 parts by mass of sodium alginate was added to 40 parts by mass of water and stirred at 500 rpm for 30 minutes, after which 10 parts by mass of pretreated polypropylene fiber was added and stirred at 500 rpm for 30 minutes, and then 2 parts by mass of calcium chloride was added and stirred at 500 rpm for 1 hour, followed by ultrasonic treatment at 800 W for 20 minutes and drying to obtain modified polypropylene fiber.

[0132] Here, the manufacturing method of dry-mix fine sand color concrete includes the following steps:

[0133] (11) Cement, solid industrial waste, fine sand, and hydroxypropyl methylcellulose ether were mixed at 500 rpm for 10 minutes to obtain a dry material.

[0134] (12) Modified polypropylene fiber was added to the dry material and stirred at 1000 rpm for 10 minutes. After that, red iron oxide and grinding aid were further added, and the mixture was stirred at 800 rpm for 10 minutes and then ball milled at 600 rpm for 8 minutes to obtain a concrete mixture.

[0135] (13) This concrete mixture was filled into a formwork, hardened, and then the formwork was removed and cured to obtain a dry-mix fine sand color concrete. Example 5

[0136] The dry-mix fine sand color concrete of this example contains 32% by mass of cement, 21% by mass of solid industrial waste, 43.2% by mass of fine sand, 1.8% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0137] The cement used here is Meien's P.W42.5 grade white Portland cement.

[0138] Here, fine sand has a coarse particle ratio of 5 mm or less.

[0139] Here, the solid industrial waste contains 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of the gypsum to the blast furnace slag is 1:1.

[0140] Here, the grinding aid contains triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 5:3:2.

[0141] Here, the method for producing modified polypropylene fibers included the following steps:

[0142] (1) Polypropylene fibers with a diameter of 0.1 mm and a length of 50 mm were placed in a plasma reactor and treated for 5 minutes at a voltage of 220 V, room temperature and normal pressure (1 atmosphere), and an output of 800 W. After that, the fibers were removed to obtain pretreated polypropylene fibers.

[0143] (2) 10 parts by mass of sodium alginate was added to 40 parts by mass of water and stirred at 500 rpm for 30 minutes, after which 10 parts by mass of pretreated polypropylene fiber was added and stirred at 500 rpm for 30 minutes, and then 2 parts by mass of calcium chloride was added and stirred at 500 rpm for 1 hour, followed by ultrasonic treatment at 800 W for 20 minutes and drying to obtain modified polypropylene fiber.

[0144] Here, the manufacturing method of dry-mix fine sand color concrete includes the following steps:

[0145] (11) Cement, solid industrial waste, fine sand, and hydroxypropyl methylcellulose ether were mixed at 500 rpm for 10 minutes to obtain a dry material.

[0146] (12) Modified polypropylene fiber was added to the dry material and stirred at 1000 rpm for 10 minutes. After that, red iron oxide and grinding aid were further added, and the mixture was stirred at 800 rpm for 10 minutes and then ball milled at 600 rpm for 8 minutes to obtain a concrete mixture.

[0147] (13) This concrete mixture was filled into a formwork, hardened, and then the formwork was removed and cured to obtain a dry-mix fine sand color concrete. Example 6

[0148] Example 6 is the same as Example 1, except that the solid industrial waste contains gypsum and blast furnace slag, and the mass ratio of gypsum to blast furnace slag is 1:0.5.

[0149] The dry-mix fine sand color concrete according to this example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0150] Here, the solid industrial waste contains 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of the gypsum to the blast furnace slag is 1:0.5. Example 7

[0151] Example 7 is the same as Example 1, except that the solid industrial waste contains gypsum and blast furnace slag, and the mass ratio of gypsum to blast furnace slag is 1:2.

[0152] The dry-mix fine sand color concrete according to this example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0153] Here, the solid industrial waste contains 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of the gypsum to the blast furnace slag is 1:2. Example 8

[0154] Example 8 is the same as Example 1, except that the ratios of the three grinding aids are different.

[0155] The dry-mix fine sand color concrete of this example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0156] Here, the grinding aid contains triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 6:2:2. Example 9

[0157] Example 9 is the same as Example 1 except that the ratios of the three grinding aids are different.

[0158] The dry-mix fine sand color concrete according to this example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0159] Here, the grinding aid contains triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 4:3:3. Example 10

[0160] Example 10 is the same as Example 1 except that cobalt oxide is used as the pigment instead of red iron oxide.

[0161] The dry-mix fine sand color concrete of this example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of cobalt oxide. Example 11

[0162] Example 11 is the same as Example 1 except that yellow iron oxide is used as the pigment instead of red iron oxide.

[0163] The dry-mix fine sand color concrete of this example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of yellow iron oxide. Example 12

[0164] The construction method for dry-mixed fine sand color concrete according to this embodiment includes the following steps: Mix water and dry-mixed fine sand color concrete in a mass ratio of 1:2.8 until uniform, then pump or manually pour the uniformly mixed slurry into the casting area, spread it evenly, self-level it, or smooth it with a trowel, and then allow it to harden. Comparative Example 1

[0165] Comparative Example 1 is the same as Example 1 except that the blending amounts of the raw materials, cement, industrial solid waste, and fine sand, were changed.

[0166] The dry-mix fine sand color concrete according to this comparative example contains 36% by mass of cement, 25% by mass of solid industrial waste, 35% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide. Comparative Example 2

[0167] Comparative Example 2 is the same as Example 1 except that the blending amounts of the raw materials, cement, industrial solid waste, and fine sand, were changed.

[0168] The dry-mix fine sand color concrete according to this comparative example contains 35% by mass of cement, 10% by mass of solid industrial waste, 51% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide. Comparative Example 3

[0169] Comparative Example 3 is the same as Example 1, except that the amounts of the modified polypropylene fibers and grinding aid used as raw materials are outside the ranges limited by the present invention.

[0170] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2.5% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.1% by mass of grinding aid, and 0.4% by mass of red iron oxide. Comparative Example 4

[0171] Comparative Example 4 is the same as Example 1 except that the amounts of modified polypropylene fibers and grinding aid used as raw materials were changed.

[0172] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 1% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 1.6% by mass of grinding aid, and 0.4% by mass of red iron oxide. Comparative Example 5

[0173] Comparative Example 5 is the same as Example 1, except that an equal amount of polypropylene fiber is used instead of the modified polypropylene fiber.

[0174] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide. Comparative Example 6

[0175] Comparative Example 6 is the same as Example 1 except that the manufacturing method of the modified polypropylene fiber is different.

[0176] In this comparative example, the plasma treatment was followed by modification with a conventional coupling agent.

[0177] In this comparative example, the method for producing modified polypropylene fibers included the following steps:

[0178] (1) Polypropylene fibers with a diameter of 0.1 mm and a length of 50 mm were placed in a plasma reactor and treated for 5 minutes at a voltage of 220 V, room temperature and normal pressure (1 atmosphere), and an output of 800 W. After that, the fibers were removed to obtain pretreated polypropylene fibers.

[0179] (2) 1 part by mass of silane coupling agent KH550 was added to 40 parts by mass of water and stirred at 500 rpm for 30 minutes, after which 10 parts by mass of pretreated polypropylene fiber was added and stirred at 500 rpm for 30 minutes, ultrasonically treated at 800 W for 20 minutes, and then dried to obtain modified polypropylene fiber. Comparative Example 7

[0180] Comparative Example 7 is the same as Example 1, except that the grinding aid does not contain hydrolyzed sclerotium gum.

[0181] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0182] Here, the grinding aid comprises triethanolamine borate and sodium methanesulfonate, and the mass ratio of the triethanolamine borate to the sodium methanesulfonate is 5:3. Comparative Example 8

[0183] Comparative Example 8 is the same as Example 1 except that triethanolamine borate is not included in the grinding aid.

[0184] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0185] Here, the grinding aid contains sodium methanesulfonate and hydrolyzed sclerotium gum, and the mass ratio of the sodium methanesulfonate to the hydrolyzed sclerotium gum is 3:2. Comparative Example 9

[0186] Comparative Example 9 is the same as Example 1 except that sodium methanesulfonate is not included in the grinding aid.

[0187] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0188] Here, the grinding aid comprises triethanolamine borate and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate to the hydrolyzed sclerotium gum is 5:2. Comparative Example 10

[0189] Comparative Example 10 is the same as Example 1, except that the grinding aid is triethanolamine borate only.

[0190] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0191] Here, the grinding aid is triethanolamine borate. Comparative Example 11

[0192] Comparative Example 11 is the same as Example 1 except that the only grinding aid is sodium methanesulfonate.

[0193] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0194] Here, the grinding aid is sodium methanesulfonate. Comparative Example 12

[0195] Comparative Example 12 is the same as Example 1 except that the only grinding aid is hydrolyzed sclerotium gum.

[0196] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0197] Here, the grinding aid is hydrolyzed sclerotium gum. Comparative Example 13

[0198] Comparative Example 13 is the same as Example 1, except that the mass ratio of triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum in the grinding aid is outside the range limited by the present invention.

[0199] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0200] Here, the grinding aid contains triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 9:0.5:0.5. Comparative Example 14

[0201] Comparative Example 14 is the same as Example 1, except that the mass ratio of triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum in the grinding aid is outside the range limited by the present invention.

[0202] The dry-mix fine sand color concrete according to this comparative example contains 30% by mass of cement, 20% by mass of solid industrial waste, 46% by mass of fine sand, 2% by mass of modified polypropylene fiber, 1% by mass of hydroxypropyl methylcellulose ether, 0.6% by mass of grinding aid, and 0.4% by mass of red iron oxide.

[0203] Here, the grinding aid contains triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 1:4.5:4.5. Test Example 1

[0204] 1. 28-day compressive strength test: The mechanical properties of concrete were evaluated in accordance with GB / T50081-2002 "Standard for experimental methods of mechanical properties of ordinary concrete."

[0205] 2. Slump test: The test was conducted in accordance with DB45 / T1621-2017. Slump retention = (initial slump - 1h slump) mm, and the smaller the value, the better the performance.

[0206] [Table 1] As can be seen from Table 1, the dry-mix type fine sand color concrete described in the present invention has high strength and excellent slump retention.

[0207] Comparing Examples 1 to 5, Example 1 is the preferred embodiment of the present invention, having the highest strength and the best slump retention. In Example 1, it was found that the strength and slump retention were further improved by further controlling the blending amounts of each raw material (cement 30 to 32 mass%, solid industrial waste 18 to 21 mass%, fine sand 43 to 48 mass%, modified polypropylene fiber 1.2 to 1.8 mass%, cellulose ether 0.8 to 1.2 mass%, pigment 0.2 to 0.6 mass%).

[0208] Comparing Example 1 with Examples 6 and 7, it was found that the ratio of gypsum to blast furnace slag can affect strength and slump within a certain range, and that by controlling the ratio within the range of the present invention, it is possible to control strength and slump retention.

[0209] Comparing Example 1 with Examples 8 and 9, it was found that the blending amount of each raw material of the grinding aid can also affect the strength and slump retention within a certain range, and by controlling it within the range of the present invention, the strength and slump retention become good, and further, by controlling it within the range of Example 1, the effect becomes even better.

[0210] Comparing Example 1 with Comparative Examples 1 and 2, it was found that the present invention requires strict control of the amount of framework material (cement, solid industrial waste, and fine sand) mixed, and that the amounts mixed in the present invention provide excellent strength and slump retention.

[0211] Comparing Example 1 with Comparative Examples 3 and 4, it was found that the amounts of modified polypropylene fiber and grinding aid to be blended must be strictly controlled, and that the blending amounts of the present invention were excellent in strength and slump retention.

[0212] A comprehensive comparison of Examples 1 to 5 and Comparative Examples 1 to 4 revealed that the blending amount of each raw material has a significant effect on strength and slump retention, and that if the blending amount of the raw materials is outside the range of claim 1, it will lead to a decrease in strength and slump retention, and in particular, if the blending amount of the grinding aid is too high, it will have a significant adverse effect on strength and slump retention. Therefore, in the present invention, it is necessary to strictly control the blending amount of each raw material.

[0213] Comparing Example 1 with Comparative Examples 5 and 6, it was found that in the present invention, by introducing polypropylene fibers as modified polypropylene fibers, strength and slump retention can be significantly improved compared to when polypropylene fibers are directly added. In other words, it was found that the modification in the present invention has a superior effect to modification using conventional coupling agents.

[0214] A comparison of Example 1 with Comparative Examples 7 to 12 reveals that the present invention can significantly improve strength and slump retention by employing a grinding aid containing triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum. Experimental data also suggests that triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum exert a significant synergistic effect in improving strength and slump retention, and that it is necessary to add these three components simultaneously to the system. Furthermore, a comparison of Example 1 with Comparative Examples 7 to 12 reveals that adding one of the grinding aids alone is undesirable because the amount added is too high, significantly adversely affecting the effect.

[0215] Comparing Example 1 with Comparative Examples 13 and 14, it was found that in the present invention, the amount of each raw material of the grinding aid also has a certain effect on the effect, and if the amount is outside the range of the present invention, the strength and slump retention will be reduced due to the influence of the characteristics of each raw material. Test Example 2

[0216] The concrete from Example 1 and Comparative Examples 7 to 9 were each cut into 50 x 50 x 50 samples, which were then placed in a xenon lamp weather aging test chamber. The experiment was carried out for seven days under the following aging conditions: aging time: 5 hours, blackboard temperature: 63°C, distance between lamp and sample: 25 cm, xenon lamp wavelength: 550 nm, and radiation intensity: 550 W / m. After seven days, the color change was observed, and the results are shown in Table 2.

[0217] [Table 2] As can be seen from Table 2, the grinding aids described in this invention can also make the color uniform and stable, making it less prone to fading.

[0218] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. Dry-mix fine sand color concrete, The dry-mix fine sand color concrete contains 20 to 35% by mass of cement, 10 to 25% by mass of solid industrial waste, 35 to 60% by mass of fine sand, 1 to 2.2% by mass of modified polypropylene fiber, 0.5 to 1.2% by mass of cellulose ether, and 0.1 to 10% by mass of pigment, based on the total mass of the dry-mix fine sand color concrete.

2. The dry-mix fine sand color concrete according to claim 1, characterized in that it contains 27 to 33 mass% cement, 15 to 22 mass% solid industrial waste, 42 to 52 mass% fine sand, 1 to 2.2 mass% modified polypropylene fiber, 0.5 to 1.2 mass% cellulose ether, and 0.1 to 0.8 mass% pigment, based on the total mass of the dry-mix fine sand color concrete.

3. The dry-mix fine sand color concrete according to claim 1, characterized in that it contains 30 to 32 mass% cement, 18 to 21 mass% solid industrial waste, 43 to 48 mass% fine sand, 1.2 to 1.8 mass% modified polypropylene fiber, 0.8 to 1.2 mass% cellulose ether, and 0.2 to 0.6 mass% pigment, based on the total mass of the dry-mix fine sand color concrete.

4. 2. The dry-mix fine sand color concrete according to claim 1, wherein the fine sand has a coarse particle ratio of 5 mm or less.

5. 2. The dry-mix fine sand color concrete according to claim 1, wherein the cement is one of white Portland cement and ordinary Portland cement.

6. 2. The dry-mix fine sand color concrete according to claim 1, wherein the pigment comprises at least one selected from the group consisting of titanium dioxide, iron oxide, burnt ochre, brown iron oxide, chromium oxide, chromium hydroxide, cobalt oxide, yellow iron oxide, and red iron oxide.

7. 2. The dry-mix fine sand color concrete according to claim 1, wherein the solid industrial waste comprises at least one selected from the group consisting of blast furnace slag, steelmaking slag, red mud, coal debris, sulfuric acid slag, gypsum, desulfurization sludge, and carbide slag.

8. The solid industrial waste contains gypsum and / or blast furnace slag, and preferably, the mass ratio of the gypsum to the blast furnace slag is (0.5 to 2):

1. Dry-mix fine sand color concrete according to claim 1.

9. 9. The dry-mix fine sand color concrete according to claim 8, wherein the mass ratio of the gypsum to the blast furnace slag is 1:

1.

10. The modified polypropylene fiber is A step of subjecting polypropylene fibers to plasma pretreatment to obtain pretreated polypropylene fibers; adding sodium alginate to water and stirring until uniform to obtain mixture A; adding pretreated polypropylene fibers to mixture A and stirring until uniform to obtain mixture B; then adding calcium chloride to mixture B and stirring until uniform to obtain mixture C; and ultrasonically treating and drying mixture C to obtain modified polypropylene fibers; Preferably, the mass ratio of the sodium alginate, the pretreated polypropylene fiber, and the calcium chloride is (0.5 to 2):1:(0.1 to 0.4), Preferably, the plasma treatment is carried out at a voltage of 220V, an output of 500-1000W, and a time of 1-10 minutes.

11. The dry-mix fine sand color concrete further contains 0.4 to 0.8% by mass of a grinding aid based on the total mass of the dry-mix fine sand color concrete; Preferably, the grinding aid comprises triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum; Preferably, the mass ratio of the triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is (3-6):(1-4):(1-3).

2. The dry-mix fine sand color concrete according to claim 1.

12. A method for producing dry-mixed fine sand color concrete according to any one of claims 1 to 11, Mixing the cement, solid industrial waste, fine sand, and cellulose ether uniformly to obtain a dry material; Adding modified polypropylene fiber to the dry material and stirring until uniform to obtain mixture D, further adding pigment and grinding aid to mixture D and stirring until uniform to obtain mixture E, and grinding mixture E in a ball mill to obtain a concrete mixture; Filling the concrete mixture into a formwork, and after the concrete mixture has hardened, removing the formwork and curing the concrete to obtain a dry-mix fine sand color concrete; A method for producing dry-mixed fine sand color concrete, comprising:

13. A method for constructing the dry-mixed fine sand color concrete according to any one of claims 1 to 11, This method for constructing dry-mixed fine sand color concrete comprises the steps of mixing water and dry-mixed fine sand color concrete and stirring to make the mixture uniform, applying the uniformly stirred slurry to a wall surface by a pump or by hand, or pouring it into a casting location, allowing it to dry naturally, and then performing self-leveling, troweling, or polishing.

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