COLORED DRY-MIXED FINE SAND CONCRETE: PREPARATION AND CONSTRUCTION METHODS FOR THIS CONCRETE

Abstract

The invention reveals a colored dry-mix fine sand concrete and a method for constructing such concrete, and falls within the field of chemical materials engineering. The colored dry-mix fine sand concrete comprises the following components in percentage by weight based on the total weight of the colored dry-mix fine sand concrete: cement: 20% to 35%, industrial solid waste: 5% to 25%, fine sand: 35% to 60%, modified polypropylene fibers: 1% to 2.2%, cellulose ether: 0.5% to 1.2%, and pigment: 0.1% to 10%. The colored dry-mix fine sand concrete of the invention has superior strength and low slump loss, is impermeable and does not separate, and has promising application prospects. In addition, the colored dry-mix fine sand concrete has durable color stability and is not easily faded.

Description

Colored dry-mixed fine sand concrete and construction method thereof Technical Field

[0001] The present application relates to the technical field of material chemistry, and in particular to a colored dry-mixed fine sand concrete and a construction method thereof. Background Art

[0002] Colored cast-in-place concrete is different from traditional concrete. Colored concrete can improve the decorative properties of concrete and avoid secondary decoration. Therefore, more and more decoration projects are using new functional materials that integrate decoration, energy saving and environmental protection. Colored concrete greatly enriches the color of the road surface, can be naturally coordinated with urban buildings and the surrounding environment, and beautifies the urban environment. At present, the strength of colored concrete still needs to be improved.

[0003] CN109809755A discloses a colored concrete and a preparation process thereof, which includes a pigment composition containing red iron oxide, heavy calcium, epoxy soybean oil, fumed silica and polyoxyethylene ether. The pigment composition is prepared by adding red iron oxide to a formulation system in the form of a pigment mixture, thereby making the red iron oxide durable and not easy to fade. It can be seen that it requires the pigment to undergo a specific mixing process, and its compressive strength is still relatively low and still needs to be improved.

[0004] CN104478352A discloses a colored concrete and a preparation method thereof, comprising an epoxy resin and a coupling agent, wherein 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. By adding the coupling agent, the color of the colored concrete is stabilized and not easily faded, the weather resistance of the product is enhanced, and the color can be retained after long-term use. By adding the epoxy resin, the wear resistance of the concrete surface is improved, and the corrosion resistance and water resistance of the product are enhanced, thereby extending the service life of the product. However, the coupling agent is easily decomposed in outdoor environments, especially in water environments, thereby affecting the color stability of the concrete, and its collapse retention performance is insufficient.

[0005] Therefore, how to provide a concrete with both strength and collapse resistance has become a technical problem that needs to be solved urgently by those skilled in the art.

[0006] Summary of the Invention

[0007] The purpose of this application is to overcome the shortcomings of the existing technology and provide a colored dry-mixed fine sand concrete and a construction method thereof. The colored dry-mixed fine sand concrete described in this application has excellent strength and low slump loss.

[0008] To achieve the above-mentioned purpose, in the first aspect of the present application, the present application provides a colored dry-mixed fine sand concrete, which, based on the total mass of the colored dry-mixed fine sand concrete, includes the following components in percentage by mass: 20-35% cement, 10-25% industrial solid waste, 35-60% fine sand, 1-2.2% modified polypropylene fiber, 0.5-1.2% cellulose ether, and 0.1-10% pigment.

[0009] As a preferred embodiment of the present application, based on the total mass of the colored dry-mixed fine sand concrete, it includes the following components in mass percentage: 27-33% cement, 15-22% industrial solid waste, 42-52% fine sand, 1-2.2% modified polypropylene fiber, 0.5-1.2% cellulose ether, and 0.1-0.8% pigment.

[0010] As a preferred embodiment of the present application, based on the total mass of the colored dry-mixed fine sand concrete, it includes the following components in mass percentage: 30-32% cement, 18-21% industrial solid waste, 43-48% fine sand, 1.2-1.8% modified polypropylene fiber, 0.8-1.2% cellulose ether, and 0.2-0.6% pigment.

[0011] As a preferred embodiment of the present application, based on the total mass of the colored dry-mixed fine sand concrete, it includes the following components in percentage by mass: 30% cement, 20% industrial solid waste, 36% fine sand, 2% modified polypropylene fiber, 1% cellulose ether, 0.4% pigment, and 10% water.

[0012] As a preferred embodiment of the present application, the fineness modulus of the fine sand is less than 5 mm.

[0013] As a preferred embodiment of the present application, the cement is one of white Portland cement and ordinary Portland cement.

[0014] As a preferred embodiment of the present application, the pigment includes at least one of titanium dioxide, iron oxide, burnt ochre, iron oxide brown, chromium oxide, chromium hydroxide, cobalt oxide, iron oxide yellow, and iron oxide red.

[0015] As a preferred embodiment of the present application, the industrial solid waste includes at least one of blast furnace slag, steel slag, red mud, coal slag, sulfuric acid slag, gypsum, desulfurization ash, and carbide slag.

[0016] As a preferred embodiment of the present application, the industrial solid waste includes gypsum and / or blast furnace slag.

[0017] As a preferred embodiment of the present application, the mass ratio of the gypsum to the blast furnace slag is (0.5-2):1.

[0018] As a preferred embodiment of the present application, the mass ratio of the gypsum to the blast furnace slag is 1:1.

[0019] As a preferred embodiment of the present application, the method for preparing the modified polypropylene fiber comprises the following steps:

[0020] The polypropylene fiber is subjected to plasma pretreatment to obtain pretreated polypropylene fiber;

[0021] Sodium alginate is added to water and stirred to obtain a mixture A; pretreated polypropylene fiber is added to the mixture A and stirred to obtain a mixture B; calcium chloride is added to the mixture B and stirred to obtain a mixture C; the mixture C is ultrasonically treated and dried to obtain modified polypropylene fiber;

[0022] As a preferred embodiment of the present application, the mass ratio of the sodium alginate, pretreated polypropylene fiber and calcium chloride is (0.5-2):1:(0.1-0.4).

[0023] As a preferred embodiment of the present application, the mass ratio of the sodium alginate, pretreated polypropylene fiber and calcium chloride is 1:1:0.2.

[0024] As a preferred embodiment of the present application, the voltage of the plasma treatment is 220V, the power is 500-1000W, and the time is 1-10 minutes.

[0025] As a preferred embodiment of the present application, the length of the polypropylene fiber is 20 to 60 mm.

[0026] As a preferred embodiment of the present application, based on the total mass of the colored dry-mixed fine sand concrete, it also includes the following components in percentage by mass: 0.4-0.8% grinding aid; preferably 0.5-0.8% grinding aid, most preferably 0.6% grinding aid.

[0027] The grinding aid comprises triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum; the mass ratio of the triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum is (3-6): (1-4): (1-3).

[0028] As a preferred embodiment of the present application, the mass ratio of triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 5:3:2.

[0029] In a second aspect of the present application, the present application provides a method for preparing colored dry-mixed fine sand concrete, comprising the following steps:

[0030] Mixing cement, industrial solid waste, fine sand and cellulose ether uniformly to obtain dry material;

[0031] Adding modified polypropylene fiber to dry material and stirring evenly to obtain mixture D; then adding pigment and grinding aid to mixture D and stirring evenly to obtain mixture E; ball milling mixture E to obtain a mixed material;

[0032] The mixed material is placed into a mold, and after the mixed material hardens, the mold is removed and cured to obtain colored dry-mix fine sand concrete.

[0033] In the third aspect of the present application, the present application provides a construction method for colored dry-mixed fine sand concrete, comprising the following steps: mixing water and colored dry-mixed fine sand concrete and stirring them evenly, pumping or manually plastering the evenly mixed slurry on the wall or pouring it to the site to be poured, naturally drying, self-leveling, smoothing or polishing.

[0034] The beneficial effects of the present application are as follows: (1) the colored dry-mixed fine sand concrete described in the present application has excellent strength, small slump loss, no water seepage, no segregation, and has broad application prospects, and the color stability of the colored concrete is strong and not easy to fade; (2) the present application rationally designs the amount of cement, industrial solid waste, and fine sand so that the three as the main materials can be well stacked, effectively controls the carbonization reaction process, achieves the optimal stacking density of the matrix structure, improves the skeleton stacking strength while ensuring the carbonization of the components, effectively improves the overall strength, and has small slump loss; in the system of the present application, the pigment can be evenly dispersed, has good color uniformity, and at the same time has strong color stability and is not easy to fade. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] In this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0037] In this application, when referring to numerical ranges, unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges subsumed therein.

[0038] In the present application, there is no particular limitation on the specific dispersion and stirring treatment methods.

[0039] The reagents and instruments used in this application without manufacturer indication are all conventional products that can be purchased commercially.

[0040] An embodiment of the present application provides a colored dry-mixed fine sand concrete, which includes the following components in percentage by mass based on the total mass of the colored dry-mixed fine sand concrete: 20-35% cement, 10-25% industrial solid waste, 35-60% fine sand, 1-2.2% modified polypropylene fiber, 0.5-1.2% cellulose ether, and 0.1-10% pigment.

[0041] In one embodiment, the colored dry-mix fine sand concrete comprises the following components in percentage by mass, based on the total mass: 27-33% cement, 15-22% industrial solid waste, 42-52% fine sand, 1-2.2% modified polypropylene fiber, 0.5-1.2% cellulose ether, and 0.1-0.8% pigment. This application combines these various raw materials in specific proportions to produce a colored dry-mix fine sand concrete with excellent strength and low slump loss. The colored dry-mix fine sand concrete is water-resistant and does not segregate, thus having broad application prospects. Furthermore, the colored concrete exhibits strong color stability and is not easily faded.

[0042] This application rationally designs the dosage of cement, industrial solid waste, and fine sand so that the three as main materials can be well stacked, effectively controlling the carbonization reaction process, achieving the optimal stacking density of the matrix structure, improving the skeleton stacking strength while ensuring the carbonization of the components, and effectively improving the overall strength and collapse resistance.

[0043] In the system of the present application, the pigment can be evenly dispersed and has good color uniformity. At the same time, its color is stable and not easy to fade.

[0044] Among them, the addition of cellulose ether can increase the viscosity of the system, prevent segregation, and has a certain water retention effect.

[0045] At the same time, the inventors have found that in this application, the amount of each raw material has a great influence on the effect. If the amount of each raw material is controlled within the scope of this application, the overall formula system has good compatibility, good stability, high skeleton stacking strength, excellent strength and low slump loss. If the amount of each raw material deviates from the range of this application, either the strength is reduced, or the slump loss becomes larger, or even both the strength and slump are reduced. Therefore, in this application, it is necessary to strictly control the amount of each raw material.

[0046] The inventors first tried to modify the polypropylene fiber with a common silane coupling agent and found that the modification with a common silane coupling agent could improve the dispersion effect to a certain extent, but the improvement was limited.

[0047] In one embodiment, the colored dry-mix fine sand concrete comprises the following components in percentage by weight, based on the total weight of the concrete: 30-32% cement, 18-21% industrial solid waste, 43-48% fine sand, 1.2-1.8% modified polypropylene fiber, 0.8-1.2% cellulose ether, and 0.2-0.6% pigment. These amounts provide improved strength and slump.

[0048] In one embodiment, the colored dry-mix fine sand concrete comprises the following components in percentage by weight, based on the total weight of the concrete: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% cellulose ether, and 0.4% pigment. This amount of usage results in improved strength and slump.

[0049] In one embodiment, the fine sand has a fineness modulus of 5 mm or less. By using fine sand with a fineness modulus of 5 mm or less, the specific surface area is larger, and the fine sand can effectively fill the pores, thereby increasing the overall skeleton density and making the system more compact.

[0050] In one embodiment, the cement is one of white Portland cement and ordinary Portland cement. The colored dry-mixed fine sand concrete of the present application is suitable for a Portland cement system.

[0051] White Portland cement and ordinary Portland cement are both commercially available cements commonly used in the art.

[0052] In one embodiment, the pigment includes at least one of titanium dioxide, iron oxide, burnt sienna, brown iron oxide, chromium oxide, chromium hydroxide, cobalt oxide, yellow iron oxide, and red iron oxide. In the present application, the pigment can be added directly. The system of the present application has rich functional groups, which facilitates the dispersion of the pigment, eliminating the need for pre-dispersion or pre-modification of the pigment.

[0053] In one embodiment, the industrial solid waste includes at least one of blast furnace slag, steel slag, red mud, coal slag, sulfuric acid slag, gypsum, desulfurization ash, and carbide slag. By using industrial solid waste as the main material, the present application can effectively alleviate the pressure of solid waste accumulation and turn waste into treasure.

[0054] In one embodiment, the industrial solid waste includes gypsum and / or blast furnace slag; preferably, the mass ratio of gypsum to blast furnace slag is (0.5-2):1. In particular, when gypsum and blast furnace slag are used as the main materials, their compatibility and adaptability with the present application are improved. In addition to providing excellent filling and stacking effects, they can also reduce water content, lower the yield shear stress during mixing, and improve the fluidity of the mixture. They can also enhance the bonding between the components during mixing, preventing the main material from settling and sliding, and further improving the strength and collapse resistance of the system.

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

[0056] In one preferred embodiment, the particle size of the gypsum and the blast furnace slag is 800-2000 mesh.

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

[0058] The inventors first directly added polypropylene fibers and found that due to their fiber properties, polypropylene fibers had poor dispersion effect in the system of this application and were difficult to play a role. The improvement in strength and collapse retention performance was limited. Therefore, they needed to be modified.

[0059] In one embodiment, the method for preparing the modified polypropylene fiber comprises the following steps:

[0060] The polypropylene fiber is subjected to plasma pretreatment to obtain pretreated polypropylene fiber;

[0061] Sodium alginate is added to water and stirred to obtain a mixture A; pretreated polypropylene fiber is added to the mixture A and stirred to obtain a mixture B; calcium chloride is added to the mixture B and stirred to obtain a mixture C; the mixture C is ultrasonically treated and dried to obtain modified polypropylene fiber;

[0062] In one embodiment, the mass ratio of the sodium alginate, pretreated polypropylene fiber, and calcium chloride is (0.5-2):1:(0.1-0.4).

[0063] This application creatively treats polypropylene fibers with plasma. Through the action of plasma, a variety of functional groups (such as hydroxyl groups and ester groups) are formed on the surface of the polypropylene fibers, providing sites for subsequent reactions and facilitating subsequent grafting, so that the modified polypropylene fibers can be well dispersed in the system. This application directly adds it to the system in the form of modified polypropylene fibers, so that it can effectively toughen the system. The modified polypropylene fibers form a three-dimensional disordered network structure with the main material, effectively improving the pulling and bonding effect between the components during the concrete mixing process, preventing the main material from settling and sliding, and having a good dispersion effect in the formula system without agglomeration. It can avoid the introduction of pores and defects due to agglomeration, thereby improving the stability of the overall formula system.

[0064] The inventors have found that the modified polypropylene fiber of the present application has better effects than polypropylene fiber, and can more significantly improve the strength and collapse retention performance.

[0065] In one embodiment, the mass ratio of the sodium alginate, pretreated polypropylene fiber, and calcium chloride is 1:1:0.2.

[0066] In one embodiment, the plasma treatment is performed at a voltage of 220 V, a power of 500 to 1000 W, and a time of 1 to 10 minutes.

[0067] It should be noted that the plasma treatment is carried out in a conventional plasma reaction vessel.

[0068] In one embodiment, the length of the polypropylene fiber is 20 to 60 mm.

[0069] As a preferred embodiment of the present application, based on the total mass of the colored dry-mixed fine sand concrete, it also includes the following components in percentage by mass: 0.4-0.8% grinding aid; preferably 0.5-0.8% grinding aid, most preferably 0.6% grinding aid.

[0070] In one embodiment, the grinding aid comprises triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum; the mass ratio of triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum is (3-6): (1-4): (1-3).

[0071] Among them, the addition of grinding aid has good compatibility with the system and can further improve the strength of the system and reduce the slump loss.

[0072] The grinding aid of the present application creatively adopts triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum to carry out compatibility, which can reduce the surface tension of the mixture, reduce the bubbles in the concrete, improve the concrete surface smoothness, reduce the grinding resistance, improve the hydration environment of the cement, produce multiple active bonds on the surface of the cement particles, and directional adsorption on the surface of the cement particles, improve the dispersion of pigment and other easily agglomerated materials, prevent the diffusion of moisture from entering, and have good water retention, thereby delaying its hydration. And the grinding aid described in the present application has good compatibility with the system, excellent stability, and then can effectively improve strength and slump retention performance. At the same time, the grinding aid of the present application also has anti-moisture absorption and caking performance, can improve the fluidity of pigment and cement, make color uniform, color stable, and not easy to fade.

[0073] More specifically, the hydrolyzed sclerotium gum is a non-ionic salt-resistant biopolysaccharide polymer with a main chain of β-1,3-D-pyranose glucose. Every three glucose units have a β-1,6-pyranose glucose side chain. It has a high hydroxyl content and has excellent compatibility with the system. It can improve the stability of the system, has excellent water retention, improves the hydration environment of cement, and can form a three-dimensional network structure, effectively improving water seepage and alkalization phenomena.

[0074] The triethanolamine borate can increase the hydration and coagulation speed of cement, adjust the thickening speed of the mixture, delay the hydration effect, and improve the hydration environment of cement. At the same time, it can play a chelating role, chelate metal ions, neutralize part of the electrostatic ions generated by frictional charging, and reduce the phenomenon of electrostatic adsorption; it enables the cement to generate more hydration products in the early stage, reduces the porosity, thereby improving the anti-permeability performance of the cement and having an early strength effect.

[0075] The sodium methanesulfonate has a small molecular weight and can be well adsorbed on the surface of the skeleton material during the mixing process, thereby reducing the surface free energy, reducing the agglomeration of the skeleton material, and improving the dispersion of the skeleton material. It can improve the dispersibility of particles during the cement clinker grinding process, improve the grinding aid effect of the grinding aid, thereby improving the efficiency of the grinding process and reducing the energy consumption of the grinding process.

[0076] The inventors have found that the grinding aid improves strength and slump retention performance through the combined action of triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum. The three components have a synergistic gain and complementary interaction relationship. The addition, reduction, or replacement of any one component in the grinding aid has a significant effect on the strength and slump retention performance of the resulting concrete.

[0077] The inventors further explored the influence of the mass ratio of the three on the effect, and further found that if the amount of hydrolyzed sclerotinia gum is too large, the viscosity of the material is too large, the fluidity is deteriorated, and the mixing effect is worsened. If its amount is too small, the improvement effect of water seepage and alkalization and the stability of the system is limited. If the amount of triethanolamine borate is too small, the improvement effect is limited. If its amount is too large, it causes the skeleton material particles to be excessively concentrated, which increases the porosity of the particle accumulation. If the amount of sodium methanesulfonate is too small, the improvement effect is limited. If its amount is too large, the amount of hydrolyzed sclerotinia gum and triethanolamine borate will become smaller, which will also lead to a decrease in the effect. Therefore, in the present invention, it is necessary to strictly control the mass ratio of triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotinia gum.

[0078] In one preferred embodiment, the mass ratio of triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is 5:3:2. In particular, when the mass ratio of triethanolamine borate, sodium methanesulfonate, and hydrolyzed sclerotium gum is within this range, better effects, higher strength, and better collapse retention are achieved.

[0079] One embodiment of the present application provides a method for preparing colored dry-mixed fine sand concrete, comprising the following steps:

[0080] Mixing cement, industrial solid waste, fine sand and cellulose ether uniformly to obtain dry material;

[0081] Adding modified polypropylene fiber to dry material and stirring evenly to obtain mixture D; then adding pigment and grinding aid to mixture D and stirring evenly to obtain mixture E; ball milling mixture E to obtain a mixed material;

[0082] The mixed material is placed into a mold, and after the mixed material hardens, the mold is removed and cured to obtain colored dry-mix fine sand concrete.

[0083] It should be noted that, in the method for preparing colored concrete, there is no particular limitation on the manner of mixing and stirring, as long as the purpose of uniform stirring and mixing is achieved.

[0084] One embodiment of the present application provides a construction method for colored dry-mixed fine sand concrete, comprising the following steps: mixing water and colored dry-mixed fine sand concrete evenly, pouring the evenly mixed slurry to the site to be poured by pumping or manually, spreading, self-leveling or smoothing, and then solidifying.

[0085] The following examples are provided to facilitate understanding of the present application. These examples are not provided to limit the scope of the claims.

[0086] Example 1

[0087] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0088] Among them, the cement is Mingyan brand P.W42.5 grade white Portland cement.

[0089] Among them, the fineness modulus of fine sand is less than 5mm.

[0090] Among them, industrial solid waste includes 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of gypsum to blast furnace slag is 1:1.

[0091] The grinding aids include 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.

[0092] The preparation method of modified polypropylene fiber comprises the following steps:

[0093] (1) A polypropylene fiber with a diameter of 0.1 mm and a length of 50 mm was placed in a plasma reaction vessel, treated at a voltage of 220 V, normal temperature and pressure (one atmosphere) and a power of 800 W for 5 minutes, and then taken out to obtain a pretreated polypropylene fiber.

[0094] (2) 10 parts of sodium alginate were added to 40 parts of water, stirred at 500 rpm for 30 min, then 10 parts of pretreated polypropylene fiber were added, stirred at 500 rpm for 30 min, 2 parts of calcium chloride were added, stirred at 500 rpm for 1 h, then ultrasonically treated at 800 W for 20 min, and dried to obtain modified polypropylene fiber.

[0095] The method for preparing colored dry-mixed fine sand concrete comprises the following steps:

[0096] (11) Cement, industrial solid waste, fine sand, and hydroxypropyl methylcellulose ether were mixed at 500 rpm for 10 min to obtain a dry material;

[0097] (12) Adding modified polypropylene fiber to the dry material, stirring at 1000 rpm for 10 min, then adding iron oxide red and grinding aid, stirring at 800 rpm for 10 min, and ball milling at 600 rpm for 8 min to obtain a mixed material;

[0098] (13) The mixed material is placed into a mold, and after hardening, the mold is removed and cured to obtain colored dry-mix fine sand concrete.

[0099] Example 2

[0100] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 32.1% cement, 22% industrial solid waste, 42% fine sand, 2.2% modified polypropylene fiber, 0.5% hydroxypropyl methylcellulose ether, 0.4% grinding aid, and 0.8% iron oxide red water.

[0101] Among them, the cement is Mingyan brand P.W42.5 grade white Portland cement.

[0102] Among them, the fineness modulus of fine sand is less than 5mm.

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

[0104] The grinding aids include 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] The preparation method of modified polypropylene fiber comprises the following steps:

[0106] (1) A polypropylene fiber with a diameter of 0.1 mm and a length of 50 mm was placed in a plasma reaction vessel, treated at a voltage of 220 V, normal temperature and pressure (one atmosphere) and a power of 800 W for 5 minutes, and then taken out to obtain a pretreated polypropylene fiber.

[0107] (2) 10 parts of sodium alginate were added to 40 parts of water, stirred at 500 rpm for 30 min, then 10 parts of pretreated polypropylene fiber were added, stirred at 500 rpm for 30 min, 2 parts of calcium chloride were added, stirred at 500 rpm for 1 h, then ultrasonically treated at 800 W for 20 min, and dried to obtain modified polypropylene fiber.

[0108] The method for preparing colored dry-mixed fine sand concrete comprises the following steps:

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

[0110] (12) Adding modified polypropylene fiber to the dry material, stirring at 1000 rpm for 10 min, then adding iron oxide red and grinding aid, stirring at 800 rpm for 10 min, and ball milling at 600 rpm for 8 min to obtain a mixed material;

[0111] (13) The mixed material is placed into a mold, and after hardening, the mold is removed and cured to obtain colored dry-mix fine sand concrete.

[0112] Example 3

[0113] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 29.8% cement, 15% industrial solid waste, 52% fine sand, 1% modified polypropylene fiber, 1.2% hydroxypropyl methylcellulose ether, 0.8% grinding aid, and 0.2% red iron oxide.

[0114] Among them, the cement is Mingyan brand P.W42.5 grade white Portland cement.

[0115] Among them, the fineness modulus of fine sand is less than 5mm.

[0116] Among them, industrial solid waste includes 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of gypsum to blast furnace slag is 1:1.

[0117] The grinding aids include 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.

[0118] The preparation method of modified polypropylene fiber comprises the following steps:

[0119] (1) A polypropylene fiber with a diameter of 0.1 mm and a length of 50 mm was placed in a plasma reaction vessel, treated at a voltage of 220 V, normal temperature and pressure (one atmosphere) and a power of 800 W for 5 minutes, and then taken out to obtain a pretreated polypropylene fiber.

[0120] (2) 10 parts of sodium alginate were added to 40 parts of water, stirred at 500 rpm for 30 min, then 10 parts of pretreated polypropylene fiber were added, stirred at 500 rpm for 30 min, 2 parts of calcium chloride were added, stirred at 500 rpm for 1 h, then ultrasonically treated at 800 W for 20 min, and dried to obtain modified polypropylene fiber.

[0121] The method for preparing colored dry-mixed fine sand concrete comprises the following steps:

[0122] (11) Cement, industrial solid waste, fine sand, and hydroxypropyl methylcellulose ether were mixed at 500 rpm for 10 min to obtain a dry material;

[0123] (12) Adding modified polypropylene fiber to the dry material, stirring at 1000 rpm for 10 min, then adding iron oxide red and grinding aid, stirring at 800 rpm for 10 min, and ball milling at 600 rpm for 8 min to obtain a mixed material;

[0124] (13) The mixed material is placed into a mold, and after hardening, the mold is removed and cured to obtain colored dry-mix fine sand concrete.

[0125] Example 4

[0126] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30.5% cement, 18% industrial solid waste, 48% fine sand, 1.2% modified polypropylene fiber, 1.2% hydroxypropyl methylcellulose ether, 0.7% grinding aid, and 0.4% red iron oxide.

[0127] Among them, the cement is Mingyan brand P.W42.5 grade white Portland cement.

[0128] Among them, the fineness modulus of fine sand is less than 5mm.

[0129] Among them, industrial solid waste includes 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of gypsum to blast furnace slag is 1:1.

[0130] The grinding aids include 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.

[0131] The preparation method of modified polypropylene fiber comprises the following steps:

[0132] (1) A polypropylene fiber with a diameter of 0.1 mm and a length of 50 mm was placed in a plasma reaction vessel, treated at a voltage of 220 V, normal temperature and pressure (one atmosphere) and a power of 800 W for 5 minutes, and then taken out to obtain a pretreated polypropylene fiber.

[0133] (2) 10 parts of sodium alginate were added to 40 parts of water, stirred at 500 rpm for 30 min, then 10 parts of pretreated polypropylene fiber were added, stirred at 500 rpm for 30 min, 2 parts of calcium chloride were added, stirred at 500 rpm for 1 h, then ultrasonically treated at 800 W for 20 min, and dried to obtain modified polypropylene fiber.

[0134] The method for preparing colored dry-mixed fine sand concrete comprises the following steps:

[0135] (11) Cement, industrial solid waste, fine sand, and hydroxypropyl methylcellulose ether were mixed at 500 rpm for 10 min to obtain a dry material;

[0136] (12) Adding modified polypropylene fiber to the dry material, stirring at 1000 rpm for 10 min, then adding iron oxide red and grinding aid, stirring at 800 rpm for 10 min, and ball milling at 600 rpm for 8 min to obtain a mixed material;

[0137] (13) The mixed material is placed into a mold, and after hardening, the mold is removed and cured to obtain colored dry-mix fine sand concrete.

[0138] Example 5

[0139] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 32% cement, 21% industrial solid waste, 43.2% fine sand, 1.8% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0140] Among them, the cement is Mingyan brand P.W42.5 grade white Portland cement.

[0141] Among them, the fineness modulus of fine sand is less than 5mm.

[0142] Among them, industrial solid waste includes 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of gypsum to blast furnace slag is 1:1.

[0143] The grinding aids include 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.

[0144] The preparation method of modified polypropylene fiber comprises the following steps:

[0145] (1) A polypropylene fiber with a diameter of 0.1 mm and a length of 50 mm was placed in a plasma reaction vessel, treated at a voltage of 220 V, normal temperature and pressure (one atmosphere) and a power of 800 W for 5 minutes, and then taken out to obtain a pretreated polypropylene fiber.

[0146] (2) 10 parts of sodium alginate were added to 40 parts of water, stirred at 500 rpm for 30 min, then 10 parts of pretreated polypropylene fiber were added, stirred at 500 rpm for 30 min, 2 parts of calcium chloride were added, stirred at 500 rpm for 1 h, then ultrasonically treated at 800 W for 20 min, and dried to obtain modified polypropylene fiber.

[0147] The method for preparing colored dry-mixed fine sand concrete comprises the following steps:

[0148] (11) Cement, industrial solid waste, fine sand, and hydroxypropyl methylcellulose ether were mixed at 500 rpm for 10 min to obtain a dry material;

[0149] (12) Adding modified polypropylene fiber to the dry material, stirring at 1000 rpm for 10 min, then adding iron oxide red and grinding aid, stirring at 800 rpm for 10 min, and ball milling at 600 rpm for 8 min to obtain a mixed material;

[0150] (13) The mixed material is placed into a mold, and after hardening, the mold is removed and cured to obtain colored dry-mix fine sand concrete.

[0151] Example 6

[0152] The difference between Example 6 and Example 1 is that the industrial solid waste in Example 6 includes gypsum and blast furnace slag, and the mass ratio of gypsum to blast furnace slag is 1:0.5. Other aspects are the same.

[0153] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0154] Among them, industrial solid waste includes 1000 mesh gypsum and 1000 mesh blast furnace slag, and the mass ratio of gypsum to blast furnace slag is 1:0.5.

[0155] Example 7

[0156] The difference between Example 7 and Example 1 is that the industrial solid waste in Example 7 includes gypsum and blast furnace slag, and the mass ratio of gypsum to blast furnace slag is 1:2. Other aspects are the same.

[0157] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0158] Among them, industrial solid waste includes gypsum and blast furnace slag, and the mass ratio of gypsum to blast furnace slag is 1:2.

[0159] Example 8

[0160] The difference between Example 8 and Example 1 is that the ratio of the three grinding aids in Example 8 is different from that in Example 1, and the other parts are the same.

[0161] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0162] The grinding aids include 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.

[0163] Example 9

[0164] The difference between Example 9 and Example 1 is that the ratio of the three grinding aids in Example 9 is different from that in Example 1, and the other parts are the same.

[0165] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0166] The grinding aid comprises 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.

[0167] Example 10

[0168] The difference between Example 10 and Example 1 is that the pigment of Example 10 is different from that of Example 1. Example 10 uses cobalt oxide instead of red iron oxide, and all other aspects are the same.

[0169] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% cobalt oxide.

[0170] Example 11

[0171] The difference between Example 11 and Example 1 is that the pigment of Example 11 is different from that of Example 1. Example 11 uses iron oxide yellow instead of iron oxide red, and all other aspects are the same.

[0172] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% iron oxide yellow.

[0173] Example 12

[0174] A construction method for colored dry-mixed fine sand concrete comprises the following steps: uniformly mixing water and colored dry-mixed fine sand concrete in a mass ratio of 1:2.8, pouring the uniformly mixed slurry onto a site to be poured by pumping or manually, spreading, self-leveling or smoothing, and then curing.

[0175] Comparative Example 1

[0176] The difference between Comparative Example 1 and Example 1 is that the raw material amounts of cement, industrial solid waste and fine sand in Comparative Example 1 are changed, and the other contents are the same.

[0177] The colored dry-mixed fine sand concrete of this comparative example includes the following components in mass percentage: a colored dry-mixed fine sand concrete includes the following components in mass percentage: 36% cement, 25% industrial solid waste, 35% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0178] Comparative Example 2

[0179] The difference between Comparative Example 2 and Example 1 is that the raw material amounts of cement, industrial solid waste and fine sand in Comparative Example 2 are changed, and the other contents are the same.

[0180] The colored dry-mixed fine sand concrete of this comparative example includes the following components in mass percentage: a colored dry-mixed fine sand concrete includes the following components in mass percentage: 35% cement, 10% industrial solid waste, 51% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0181] Comparative Example 3

[0182] The difference between Comparative Example 3 and Example 1 is that the amounts of the modified polypropylene fiber and the grinding aid in Comparative Example 3 are not within the range defined in the present application, and the other contents are the same.

[0183] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2.5% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.1% grinding aid, and 0.4% red iron oxide.

[0184] Comparative Example 4

[0185] The difference between Comparative Example 4 and Example 1 is that the amounts of the modified polypropylene fiber and the grinding aid in Comparative Example 4 are changed, and the other contents are the same.

[0186] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 1% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 1.6% grinding aid, and 0.4% red iron oxide.

[0187] Comparative Example 5

[0188] The difference between Comparative Example 5 and Example 1 is that Comparative Example 5 uses an equal amount of polypropylene fiber to replace the modified polypropylene fiber, and all other conditions are the same.

[0189] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0190] Comparative Example 6

[0191] The difference between Comparative Example 6 and Example 1 is that the preparation method of the modified polypropylene fiber in Comparative Example 6 is different from that in Example 1, and the other aspects are the same.

[0192] In this comparative example, after plasma treatment, conventional coupling agent modification was used.

[0193] In this comparative example, the preparation method of modified polypropylene fiber comprises the following steps:

[0194] (1) A polypropylene fiber with a diameter of 0.1 mm and a length of 50 mm was placed in a plasma reaction vessel, treated at a voltage of 220 V, normal temperature and pressure (one atmosphere) and a power of 800 W for 5 minutes, and then taken out to obtain a pretreated polypropylene fiber.

[0195] (2) 1 part of silane coupling agent KH550 was added to 40 parts of water, stirred at 500 rpm for 30 minutes, and then 10 parts of pretreated polypropylene fiber were added, stirred at 500 rpm for 30 minutes, and then ultrasonically treated at 800 W for 20 minutes and dried to obtain modified polypropylene fiber.

[0196] Comparative Example 7

[0197] The difference between Comparative Example 7 and Example 1 is that the grinding aid in Comparative Example 7 does not contain hydrolyzed sclerotium gum, and all other aspects are the same.

[0198] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0199] The grinding aid comprises triethanolamine borate and sodium methanesulfonate, and the mass ratio of the triethanolamine borate and sodium methanesulfonate is 5:3.

[0200] Comparative Example 8

[0201] The difference between Comparative Example 8 and Example 1 is that the grinding aid in Comparative Example 8 does not contain triethanolamine borate, and all other aspects are the same.

[0202] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0203] The grinding aids include sodium methanesulfonate and hydrolyzed sclerotium gum, and the mass ratio of the sodium methanesulfonate to the hydrolyzed sclerotium gum is 3:2.

[0204] Comparative Example 9

[0205] The difference between Comparative Example 9 and Example 1 is that the grinding aid in Comparative Example 9 does not contain sodium methanesulfonate, and all other aspects are the same.

[0206] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0207] The grinding aid comprises triethanolamine borate and hydrolyzed sclerotium gum, and the mass ratio of the triethanolamine borate and hydrolyzed sclerotium gum is 5:2.

[0208] Comparative Example 10

[0209] The difference between Comparative Example 10 and Example 1 is that the grinding aid in Comparative Example 10 is a single triethanolamine borate, and the other aspects are the same.

[0210] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0211] Wherein, the grinding aid is triethanolamine borate.

[0212] Comparative Example 11

[0213] The difference between Comparative Example 11 and Example 1 is that the grinding aid in Comparative Example 11 is single sodium methanesulfonate, and the other aspects are the same.

[0214] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0215] Wherein, the grinding aid is sodium methanesulfonate.

[0216] Comparative Example 12

[0217] The difference between Comparative Example 12 and Example 1 is that the grinding aid in Comparative Example 12 is hydrolyzed sclerotium gum, and the other aspects are the same.

[0218] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0219] Wherein, the grinding aid is hydrolyzed sclerotium gum.

[0220] Comparative Example 13

[0221] Comparative Example 13 is different from Example 1 in that, in the grinding aid of Comparative Example 13, the mass ratio of triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum is not within the range defined in the present invention, and the other contents are the same.

[0222] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0223] The grinding aids include 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.

[0224] Comparative Example 14

[0225] Comparative Example 14 is different from Example 1 in that, in the grinding aid of Comparative Example 14, the mass ratio of triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum is not within the range defined in the present invention, and the other contents are the same.

[0226] A colored dry-mixed fine sand concrete comprises the following components in percentage by mass: 30% cement, 20% industrial solid waste, 46% fine sand, 2% modified polypropylene fiber, 1% hydroxypropyl methylcellulose ether, 0.6% grinding aid, and 0.4% red iron oxide.

[0227] The grinding aids include 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.

[0228] Test Example 1

[0229] 1. 28d compressive strength test: Test the mechanical properties of concrete according to GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete".

[0230] 2. Slump test: Test according to DB45 / T1621-2017. Slump retention performance = (initial slump - 1h slump) mm. The smaller the value, the better the performance.

[0231] Table 1

[0232] It can be seen from Table 1 that the colored dry-mixed fine sand concrete of the present invention has high strength and excellent collapse resistance.

[0233] Among them, it can be seen from the comparison of Examples 1 to 5 that Example 1 is the best embodiment of the present invention, which has the highest strength and the best slump retention performance. By further controlling the amount of each raw material (30-32% cement, 18-21% industrial solid waste, 43-48% fine sand, 1.2-1.8% modified polypropylene fiber, 0.8-1.2% cellulose ether, and 0.2-0.6% pigment), the strength and slump retention performance are further improved.

[0234] Comparing Example 1 with Examples 6 to 7, it can be seen that the ratio of gypsum to blast furnace slag can affect the strength and slump within a certain range. By controlling the ratio within the scope of the present invention, the strength and slump retention performance can be controlled.

[0235] By comparing Example 1 with Examples 8 to 9, it can be seen that the amount of each raw material of the grinding aid can also affect the strength and collapse retention performance within a certain range. By controlling it within the scope of the present invention, the strength and collapse retention performance are better, and further controlling it within the scope of Example 1, the effect is better.

[0236] By comparing Example 1 with Comparative Examples 1 to 2, it can be seen that in the present application, the amount of skeleton materials (cement, industrial solid waste and fine sand) needs to be strictly controlled. Under the amount used in the present invention, the strength and collapse retention performance are excellent.

[0237] Comparison of Example 1 with Comparative Examples 3 to 4 shows that the dosage of modified polypropylene fiber and grinding aid also needs to be strictly controlled. Under the dosage of the present invention, the strength and collapse retention performance are excellent.

[0238] A comprehensive comparison of Examples 1 to 5 with Comparative Examples 1 to 4 shows that the amount of each raw material has a great influence on the strength and collapse retention performance. If the amount of the raw material is not within the scope of claim 1, it will lead to a decrease in strength and a decrease in collapse retention performance. In particular, if the amount of the grinding aid is too high, the negative effect on the strength and collapse retention performance is relatively large. Therefore, in this application, it is necessary to strictly control the amount of each raw material.

[0239] By comparing Example 1 with Comparative Examples 5 to 6, it can be seen that the present application adopts the method of modifying polypropylene fibers to introduce polypropylene fibers, which can significantly improve the strength and collapse retention performance compared to directly adding polypropylene fibers. The modification method of the present application is better than the conventional coupling agent modification.

[0240] Comparing Example 1 with Comparative Examples 7 to 12, it can be seen that in the present application, the grinding aid composed of triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum can significantly improve the strength and slump retention performance, and the experimental data suggest that triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum have a significant synergistic effect in improving strength and slump retention performance. The three need to be added to the system at the same time. It should be noted that, from the comparison of Example 1 with Comparative Examples 7 to 12, it can be seen that the grinding aid should not be added alone. If added alone, due to its large amount, it has a greater negative impact on the effect.

[0241] By comparing Example 1 with Comparative Examples 13 to 14, it can be seen that in the present invention, the amount of each raw material of the grinding aid also has a certain influence on the effect. If the amount is not within the scope of the present invention, the strength and collapse retention performance will be reduced due to the influence of the characteristics of each raw material.

[0242] Test Example 2

[0243] The concrete of Example 1 and Comparative Examples 7 to 9 were made into 50*50*50 specimens and placed in a xenon lamp weathering test chamber. The aging conditions were as follows: aging time of 5 h, blackboard temperature of 63°C, lamp source distance of 25 cm from the specimen, xenon lamp wavelength of 550 nm, radiation intensity of 550 W / m, and test time of 7 days. After 7 days, color changes were observed. The results are shown in Table 2.

[0244] Table 2

[0245] As can be seen from Table 2, the grinding aid of the present invention can also make the color uniform, stable and not easy to fade.

[0246] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A colored dry-mixed fine sand concrete, characterized in that: The colored dry-mixed fine sand concrete comprises the following components in percentage by weight based on the total weight of the concrete: 20-35% cement, 10-25% industrial solid waste, 35-60% fine sand, 1-2.2% modified polypropylene fiber, 0.5-1.2% cellulose ether, and 0.1-10% pigment.

2. The colored dry-mixed fine sand concrete according to claim 1, characterized in that: The colored dry-mixed fine sand concrete comprises the following components in percentage by weight based on the total weight of the concrete: 27-33% cement, 15-22% industrial solid waste, 42-52% fine sand, 1-2.2% modified polypropylene fiber, 0.5-1.2% cellulose ether, and 0.1-0.8% pigment.

3. The colored dry-mixed fine sand concrete according to claim 1, characterized in that: The colored dry-mixed fine sand concrete comprises the following components in percentage by weight based on the total weight of the concrete: 30-32% cement, 18-21% industrial solid waste, 43-48% fine sand, 1.2-1.8% modified polypropylene fiber, 0.8-1.2% cellulose ether, and 0.2-0.6% pigment.

4. The colored dry-mixed fine sand concrete according to claim 1, characterized in that: The fineness modulus of the fine sand is less than 5 mm.

5. The colored dry-mixed fine sand concrete according to claim 1, characterized in that: The cement is one of white silicate cement and ordinary silicate cement.

6. The colored dry-mixed fine sand concrete according to claim 1, characterized in that: The pigment includes at least one of titanium dioxide, iron oxide, burnt ochre, brown iron oxide, chromium oxide, chromium hydroxide, cobalt oxide, yellow iron oxide, and red iron oxide.

7. The colored dry-mixed fine sand concrete according to claim 1, characterized in that: The industrial solid waste includes at least one of blast furnace slag, steel slag, red mud, coal slag, sulfuric acid slag, gypsum, desulfurization ash, and carbide slag.

8. The colored dry-mixed fine sand concrete according to claim 1, characterized in that: The industrial solid waste includes gypsum and / or blast furnace slag; preferably, the mass ratio of the gypsum to the blast furnace slag is (0.5-2):

1.

9. The colored dry-mixed fine sand concrete according to claim 8, characterized in that: The mass ratio of the gypsum to the blast furnace slag is 1:

1.

10. The colored dry-mixed fine sand concrete according to claim 1, characterized in that: The modified polypropylene fiber is prepared by a preparation method comprising the following steps: The polypropylene fiber is subjected to plasma pretreatment to obtain pretreated polypropylene fiber; Adding sodium alginate to water and stirring evenly to obtain a mixture A; adding pretreated polypropylene fiber to the mixture A and stirring evenly to obtain a mixture B; adding calcium chloride to the mixture B and stirring evenly to obtain a mixture C; ultrasonically treating the mixture C and drying it to obtain modified polypropylene fiber; Preferably, the mass ratio of the sodium alginate, the pretreated polypropylene fiber, and the calcium chloride is (0.5-2):1:(0.1-0.4); Preferably, the voltage of the plasma treatment is 220V, the power is 500-1000W, and the time is 1-10min.

11. The colored dry-mixed fine sand concrete according to claim 1, characterized in that: Based on the total mass of the colored dry-mixed fine sand concrete, the following components are also included in mass percentage: 0.4-0.8% grinding aid; Preferably, the grinding aid comprises triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum; Preferably, the mass ratio of triethanolamine borate, sodium methanesulfonate and hydrolyzed sclerotium gum is (3-6): (1-4): (1-3).

12. The method for preparing colored dry-mixed fine sand concrete according to any one of claims 1 to 11, characterized in that: The following steps are involved: Mix cement, industrial solid waste, fine sand and cellulose ether uniformly to obtain dry material; Adding modified polypropylene fiber to dry material and stirring evenly to obtain mixture D; adding pigment and grinding aid to mixture D and stirring evenly to obtain mixture E; ball milling mixture E to obtain a mixed material; The mixed material is loaded into a mold, and after the mixed material hardens, the mold is removed and cured to obtain colored dry-mixed fine sand concrete.

13. The construction method of colored dry-mixed fine sand concrete according to any one of claims 1 to 11, characterized in that: The method comprises the following steps: mixing water and colored dry-mixed fine sand concrete evenly, applying the evenly mixed slurry to the wall for plastering or pouring it to the site to be poured by pumping or manually, drying it naturally, and self-leveling or smoothing or grinding it.