A UHPC imitation stone building material structure

Abstract

The present invention provides a UHPC imitation stone building material structure, comprising a surface layer and a base layer, wherein the surface layer is located above the base layer, the surface layer is formed by spraying and curing slurries of at least two colors, and the surface layer has at least two convex spots of the same color as the sprayed slurry, and the convex spots are randomly scattered to form an uneven surface. Compared with the prior art, the UHPC imitation stone building material structure prepared by the method of the present invention has a concave-convex three-dimensional sense and a natural stone texture, and has a strong decorative effect; it has high hardness, is wear-resistant and non-slip; and its construction process is simple and easy to operate.

Description

Technical Field

[0001] The invention belongs to the field of building materials, and in particular relates to a UHPC imitation stone building material structure. Background Art

[0002] With the progress of the times and the development of society, people have higher and higher requirements for pavement materials. Single concrete pavement and asphalt pavement can no longer meet people's growing living and cultural needs. Pavement materials must develop towards diversification, personalization and functionality, and be able to reflect aesthetics and decorative effects.

[0003] Imitation stone pavement building materials are pavement structures that imitate the pattern, color, texture, and appearance of natural stone. They do not have the radioactive pollution of natural stone, but also avoid the color difference of natural stone and maintain the texture of natural stone. They can not only beautify the road surface, but also save the high cost of using natural stone.

[0004] UHPC (Ultra-high Performance Concrete) is a special concrete with ultra-high strength, ultra-low water absorption, super durability and corrosion resistance. If UHPC materials can be made into imitation stone styles, their market application range will be greatly expanded. At present, the imitation stone effect of imitation stone pavement building materials is not realistic, and the color transition is unnatural. Secondly, due to the limitation of bearing capacity, it cannot be made into large-area sized panels, and the paving period of the panels is long. Summary of the invention

[0005] In order to overcome the defects of the above-mentioned prior art, the present invention proposes a new UHPC imitation stone building material structure, which has a strong concave-convex three-dimensional sense and natural stone texture, strong decorative effect; high hardness, wear resistance and non-slip; and its construction process is simple and easy to operate.

[0006] This is achieved specifically through the following technical solutions:

[0007] A UHPC imitation stone building material structure comprises a surface layer and a base layer, wherein the surface layer is located above the base layer, the surface layer is formed by spraying and curing slurries of at least two colors, and the surface layer has at least two convex spots of colors respectively consistent with the colors of the sprayed slurries, and the convex spots are randomly scattered to form an uneven surface.

[0008] Furthermore, the average height difference between the highest point and the lowest point on the surface of the surface layer is 0.3-3 mm, the diameter of the convex spot is 2-30 mm, the surface layer has a concave-convex feeling, and the imitation stone effect is realistic.

[0009] Furthermore, the surface layer also has a plurality of fused color spots formed by cross-fusion of the slurries of different colors, so that the surface layer presents an effect of imitating stone texture.

[0010] Furthermore, the area of ​​the color blocks of the first color on the surface layer accounts for 25-70% of the total area of ​​the surface layer, wherein the first color is the main color predetermined according to design requirements, and the area of ​​the color blocks of the first color is the area where the slurry of the first color in the surface layer is sprayed and solidified and exposed on the surface.

[0011] Furthermore, the total area of ​​the fused color spots accounts for 25-70% of the total area of ​​the surface layer.

[0012] Furthermore, the surface layer is also doped with colored aggregate particles, the particle size of the colored aggregate particles is 0.3-3 mm, and the proportion is 5-35%.

[0013] Specifically, the colored aggregate particles are solid particle raw materials, and the solid particle raw materials are any one or more of quartz sand, ceramic sand, corundum or ore sand.

[0014] Furthermore, the surface layer has a thickness of 1-30 mm, and the surface layer with a thickness between 1-30 mm can have sufficient bearing capacity.

[0015] Furthermore, the combustion performance grade of the surface layer is A-grade, and the wear resistance is greater than 1.5. The combustion performance grade is tested according to the GB8624-2012 test method, and the wear resistance is tested according to the GB / T 16925-1997 test method.

[0016] Specifically, the UHPC imitation stone building material structure is prepared by the following steps:

[0017] 1) Prepare slurry: Put cement, admixture, aggregate, pigment, additive and water in a mixer and stir to form UHPC slurry with a fluidity of 120-200mm;

[0018] The fluidity of the UHPC slurry is tested according to the cement paste fluidity test method in GB / T8077-2012;

[0019] Prepare at least two colors of UHPC slurry;

[0020] 2) Spraying: Load one of the slurries into a multifunctional sprayer, adjust the air pressure to 0.2-0.8MPa, and evenly spray it directly on the constructed base layer in the form of dots or particles; then load the remaining slurries into the multifunctional sprayer, and repeat the above steps; the sprayed dots or particles are solidified to form convex spots and particle dots.

[0021] Compared with the conventional imitation stone pavement structure, the present invention has the following advantages:

[0022] 1. The color transition between the color dots on the surface is natural, showing the texture of natural stone; the particles on the surface have a strong concave and convex three-dimensional sense, and the decorative effect is strong;

[0023] 2. High hardness, wear-resistant and non-slip;

[0024] 3. Convenient construction and short construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is the appearance of the UHPC imitation stone building material structure prepared in Example 1;

[0027] Figure 2 A three-dimensional diagram of the UHPC imitation stone building material structure prepared in Example 1;

[0028] Figure 3 This is the appearance of the UHPC imitation stone building material structure prepared in Comparative Example 1;

[0029] Figure 4 This is the appearance of the UHPC imitation stone building material structure prepared in Comparative Example 2;

[0030] Figure 5 This is the appearance of the UHPC imitation stone building material structure prepared in Comparative Example 3;

[0031] Figure 6 This is the appearance of the UHPC imitation stone building material structure prepared in Comparative Example 4;

[0032] Figure 7 This is the appearance of the UHPC imitation stone building material structure prepared in Comparative Example 7.

[0033] Reference numerals:

[0034] 1-first color; 2-second color; 3-fusion color spot; 4-surface layer; 5-base layer. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The gel material referred to in the present invention refers to the sum of cement and admixtures;

[0037] The water-to-gel ratio referred to in the present invention refers to the ratio of water to gel material.

[0038] The surface slurry of the present invention can be directly sprayed on various cement-based products such as concrete, permeable concrete, ultra-high performance concrete, etc., or directly poured on a road cement-based base.

[0039] The slurry used in the following examples and comparative examples includes the following components:

[0040] Gel material, aggregate, pigment and additives, wherein the pigment used in each slurry is different; by weight, the gel material includes 25-50 parts of cement and 7-35 parts of admixture; 25-50 parts of aggregate; the additives include at least one of a thickener, a water reducer, an enhanced emulsion, a retarder and a foaming agent;

[0041] The pigment is 0-1%wt of the gel material, the auxiliary agent is 0.01-1.5%wt of the gel material, and the water-to-gel ratio is 0.14-0.25.

[0042] The pigment is selected from any at least two of titanium dioxide, red iron oxide, yellow iron oxide, chromium oxide green, Prussian blue, carbon black inorganic pigments, and phthalocyanine red, phthalocyanine blue, benzidine yellow, and Hansa yellow organic pigments.

[0043] Example 1

[0044] See also Figure 1 , 2 A UHPC imitation stone building material structure includes a surface layer 4 and a base layer 5. The surface layer 4 is located above the base layer 5. The surface layer 4 is formed by spraying and curing a slurry of a first color 1 and a second color 2. The surface layer 4 has a plurality of convex spots of the first color 1 and the second color 2. The convex spots are randomly scattered to form an uneven surface.

[0045] The average height difference between the highest point and the lowest point on the surface of the surface layer 4 is 0.3-3 mm, and the diameter of the convex spot is 2-30 mm, so that the surface layer 4 has a concave-convex feeling and a realistic stone imitation effect.

[0046] The surface layer 4 also has a number of fused color spots 3 formed by the cross-fusion of the slurry of the first color 1 and the second color 2. The total area of ​​the fused color spots 3 accounts for 30% of the total area of ​​the surface layer, making the surface layer 4 present an effect of imitating stone texture, wherein the first color 1 is white and the second color 2 is black.

[0047] The color block area of ​​the first color 1 on the surface layer 4 accounts for 25% of the total area of ​​the surface layer 4, wherein the first color 1 is the main color predetermined according to design requirements. In this embodiment, the main color is white, and the color block area of ​​the first color 1 is the area where the slurry of the first color 1 in the surface layer 4 is sprayed and solidified and exposed on the surface.

[0048] The surface layer 4 is also doped with colored aggregate particles, the particle size of the colored aggregate particles is 1-2mm, accounting for 5-35%, and the colored aggregate particles are solid particle raw materials, and the solid particle raw materials are any one or more of quartz sand, ceramic sand, corundum or ore sand. In other embodiments, the particle size of the colored aggregate particles can also be between 0.3-1mm and 2-3mm. If a small particle size range is selected, the imitation stone surface can present a delicate effect; if a large particle size range is selected, a rough effect can be presented. However, if the particle size is too small, the particles will be completely mixed with the slurry, and the particle effect cannot be presented; if the particle size is too large, the particles are too large to present the imitation stone effect.

[0049] The surface layer 4 has a thickness of 15 mm, which can provide sufficient bearing capacity for the road surface. In other embodiments, the surface layer 4 can also have a thickness of 1 mm, 10 mm, 20 mm, 30 mm, etc.

[0050] The combustion performance grade of the surface layer 4 is grade A, and the wear resistance is greater than 1.5. The combustion performance grade is tested according to the GB8624-2012 test method, and the wear resistance is tested according to the GB / T 16925-1997 test method.

[0051] The convex spots of the surface layer 4 are formed by spraying and curing white and black slurries, each of which includes the following components:

[0052] Gel material, aggregate, pigment and additives, wherein the pigment used in each slurry is different;

[0053] By weight,

[0054] The gel material includes 30 parts of cement and 10 parts of admixture;

[0055] 30 parts of aggregate;

[0056] Additives include thickeners, water reducers, enhanced emulsions, retarders, and foaming agents;

[0057] Among them, the pigment is 1%wt of the gel material, the thickener is 0.2%wt of the gel material, the water reducer is 0.2%wt of the gel material, the retarder is 0.1%wt of the gel material, the foaming agent is 0.1%wt of the gel material, and the water-to-binder ratio is 0.15.

[0058] Prepare UHPC imitation stone building material structure according to the following steps:

[0059] 1) Preparation:

[0060] By weight, there are 30 parts of cement, 10 parts of admixture, 30 parts of aggregate, 1% of the pigment of the gel material, 0.2% of the thickener of the gel material, 0.2% of the water reducer of the gel material, 0.1% of the retarder of the gel material, 0.1% of the foaming agent of the gel material, and water is prepared at a water-to-cement ratio of 0.15.

[0061] 2) Preparation of slurry:

[0062] The weighed cement, admixture, aggregate, titanium dioxide, additive and water are placed in a mixer and stirred to form UHPC slurry A with a fluidity of 150 mm;

[0063] The weighed cement, admixture, aggregate, carbon black, additive and water are placed in a mixer and stirred to form UHPC slurry B with a fluidity of 150 mm;

[0064] 3) Spraying: Load UHPC slurry A into a multifunctional sprayer, adjust the air pressure to 0.42MPa, and directly and evenly spray it on the constructed base layer 5 in the form of dots or granules; Load UHPC slurry B into a multifunctional sprayer, adjust the air pressure to 0.42MPa, and directly and evenly spray it on the constructed base layer 5 in the form of dots or granules; the sprayed dots or granules are solidified to form convex spots and granular dots;

[0065] The base layer 5 can be various cement-based products such as concrete, permeable concrete, and ultra-high performance concrete.

[0066] 4) Maintenance and post-treatment: After 1-3 days of natural maintenance, the surface is ground, polished and covered.

[0067] After completing the above steps, observe the appearance. Figure 1 , 2 As shown, the imitation stone effect is uniform and natural, and the surface has a concave and convex three-dimensional feel.

[0068] Example 2

[0069] A UHPC imitation stone building material structure comprises a surface layer and a base layer, wherein the surface layer is located above the base layer, and is formed by spraying and curing slurries of three colors, namely, a first color, a second color, and a third color. The surface layer has a plurality of convex spots of the same color as the sprayed slurry, and the convex spots are randomly scattered to form an uneven surface.

[0070] The average height difference between the highest point and the lowest point on the surface is 0.3-3mm, the diameter of the convex spots is 2-30mm, the surface has a concave-convex feel, and the imitation stone effect is realistic.

[0071] The surface layer also has a number of fused color spots formed by the cross-fusion of the above three different colors of slurries. The total area of ​​the fused color spots accounts for 30% of the total area of ​​the surface layer, making the surface layer present an imitation stone texture effect, among which the first color is yellow, the second color is black, and the third color is red.

[0072] The area of ​​the color blocks of the first color on the surface layer accounts for 30% of the total area of ​​the surface layer, wherein the first color is the main color predetermined according to design requirements. In this embodiment, the main color is yellow, and the area of ​​the color blocks of the first color is the area where the slurry of the first color in the surface layer is sprayed and solidified and exposed on the surface.

[0073] The surface layer is also doped with colored aggregate particles, the particle size of which is 0.3-1mm, accounting for 25%, and the colored aggregate particles are solid particle raw materials, and the solid particle raw materials are any one or more of quartz sand, ceramic sand, corundum or mineral sand. In other embodiments, the particle size of the colored aggregate particles can also be between 1-2mm and 2-3mm. If a small particle size range is selected, the imitation stone surface can present a delicate effect; if a large particle size range is selected, a rough effect can be presented. However, if the particle size is too small, the particles will be completely mixed with the slurry, and the particle effect cannot be presented; if the particle size is too large, the particles are too large to present the imitation stone effect.

[0074] The surface layer thickness is 10mm, which can provide enough bearing capacity for the road surface. In other embodiments, the surface layer 4 thickness can also be 1mm, 15mm, 20mm, 30mm, etc.

[0075] The combustion performance grade of the surface layer is A-grade, and the wear resistance is greater than 1.5. The combustion performance grade is tested according to the GB8624-2012 test method, and the wear resistance is tested according to the GB / T 16925-1997 test method.

[0076] The convex spots on the surface layer are formed by spraying and curing three colors of slurry, each of which includes the following components:

[0077] Gel material, aggregate, pigment and additives, wherein the pigment used in each slurry is different;

[0078] By weight,

[0079] The gel material includes 30 parts of cement and 10 parts of admixture;

[0080] 30 parts of aggregate;

[0081] Additives include thickeners, water reducers, enhanced emulsions, retarders, and foaming agents;

[0082] The pigment is 0-1%wt of the gel material, the thickener is 0.01-0.5%wt of the gel material, the water reducer is 0.05-0.5%wt of the gel material, the retarder is 0.01-0.1%wt of the gel material, the foaming agent is 0.03-0.3%wt of the gel material, and the water-to-binder ratio is 0.14-0.25.

[0083] Prepare UHPC imitation stone building material structure according to the following steps:

[0084] 1) Preparation:

[0085] By weight, there are 30 parts of cement, 10 parts of admixture, 30 parts of aggregate, 1% of the pigment of the gel material, 0.2% of the thickener of the gel material, 0.2% of the water reducer of the gel material, 0.1% of the retarder of the gel material, 0.1% of the foaming agent of the gel material, and water is prepared at a water-to-cement ratio of 0.15.

[0086] 2) Preparation of slurry:

[0087] The weighed cement, admixture, aggregate, iron ore, additives and water are placed in a mixer and stirred to form UHPC slurry A with a viscosity of 180 mm;

[0088] The weighed cement, admixture, aggregate, phthalocyanine red, additive and water are placed in a mixer and stirred to form UHPC slurry B with a fluidity of 180 mm;

[0089] The weighed cement, admixture, aggregate, carbon black, additive and water are placed in a mixer and stirred to form UHPC slurry C with a fluidity of 180 mm;

[0090] 3) Spraying: Load UHPC slurry A into a multifunctional sprayer, adjust the air pressure to 0.6MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; load UHPC slurry B into a multifunctional sprayer, adjust the air pressure to 0.6MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; load UHPC slurry C into a multifunctional sprayer, adjust the air pressure to 0.6MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; the sprayed dots or granules form convex spots and granular dots after solidification;

[0091] The base layer can be various cement-based products such as concrete, permeable concrete, and ultra-high performance concrete.

[0092] 4) Maintenance and post-treatment: After 1-3 days of natural maintenance, the surface is ground, polished and covered to achieve the UHPC imitation stone effect.

[0093] Comparative Example 1

[0094] 1) Preparation:

[0095] By weight, 40 parts of cement, 30 parts of aggregate, 1% of the pigment, 0.2% of the thickener, 0.2% of the gel material, 0.2% of the water reducer, 0.1% of the gel material, 0.1% of the retarder, 0.1% of the gel material, and 0.1% of the foaming agent. Prepare water at a water-to-cement ratio of 0.15.

[0096] 2) Preparation of slurry:

[0097] The weighed cement, admixture, aggregate, titanium dioxide, additive and water are placed in a mixer and stirred to form UHPC slurry A with a viscosity of 150 mm;

[0098] The weighed cement, admixture, aggregate, carbon black, additive and water are placed in a mixer and stirred to form UHPC slurry B with a viscosity of 150 mm;

[0099] 3) Spraying: Load UHPC slurry A into a multifunctional sprayer, adjust the air pressure to 0.42MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; Load UHPC slurry B into a multifunctional sprayer, adjust the air pressure to 0.42MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; the sprayed dots or granules are solidified to form convex spots and granular dots;

[0100] The base layer can be various cement-based products such as concrete, permeable concrete, and ultra-high performance concrete.

[0101] 4) Maintenance and post-treatment: After 1-3 days of natural maintenance, the surface is ground, polished and covered.

[0102] After completing the above steps, observe the appearance. Figure 3 As shown, the imitation stone effect is relatively uniform and natural, and the surface has a concave and convex three-dimensional feel.

[0103] Comparative Example 2

[0104] 1) Preparation:

[0105] By weight, there are 30 parts of cement, 10 parts of admixture, 30 parts of aggregate, 1% of the pigment of the gel material, 0.2% of the thickener of the gel material, 0.2% of the water reducer of the gel material, 0.1% of the retarder of the gel material, 0.1% of the foaming agent of the gel material, and water is prepared at a water-to-cement ratio of 0.3.

[0106] 2) Preparation of slurry:

[0107] The weighed cement, admixture, aggregate, titanium dioxide, additive and water are placed in a mixer and stirred to form UHPC slurry A with a fluidity of 150 mm;

[0108] The weighed cement, admixture, aggregate, carbon black, additive and water are placed in a mixer and stirred to form UHPC slurry B with a fluidity of 150 mm;

[0109] 3) Spraying: Load UHPC slurry A into a multifunctional sprayer, adjust the air pressure to 0.42MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; Load UHPC slurry B into a multifunctional sprayer, adjust the air pressure to 0.42MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; the sprayed dots or granules are solidified to form convex spots and granular dots;

[0110] The base layer can be various cement-based products such as concrete, permeable concrete, and ultra-high performance concrete.

[0111] 4) Maintenance and post-treatment: After 1-3 days of natural maintenance, the surface is ground, polished and covered.

[0112] After completing the above steps, observe the appearance. Figure 4 As shown, because the water-to-cement ratio is too large, the slurry becomes very thin, and slurries of different colors will completely merge into one color, unable to form a stone-like effect, and the surface has no three-dimensional concave-convex feeling.

[0113] Comparative Example 3

[0114] 1) Preparation:

[0115] By weight, there are 30 parts of cement, 10 parts of admixture, 30 parts of aggregate, 1% of pigment, 0.2% of thickener, 0.2% of water reducer, 0.1% of retarder, 0.1% of foaming agent, and water is prepared at a water-to-cement ratio of 0.1.

[0116] 2) Preparation of slurry:

[0117] The weighed cement, admixture, aggregate, titanium dioxide, additive and water are placed in a mixer and stirred to form UHPC slurry A with a fluidity of 150 mm;

[0118] The weighed cement, admixture, aggregate, carbon black, additive and water are placed in a mixer and stirred to form UHPC slurry B with a fluidity of 150 mm;

[0119] 3) Spraying: Load UHPC slurry A into a multifunctional sprayer, adjust the air pressure to 0.42MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; Load UHPC slurry B into a multifunctional sprayer, adjust the air pressure to 0.42MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; the sprayed dots or granules are solidified to form convex spots and granular dots;

[0120] The base layer can be various cement-based products such as concrete, permeable concrete, and ultra-high performance concrete.

[0121] 4) Maintenance and post-treatment: After 1-3 days of natural maintenance, the surface is ground, polished and covered.

[0122] After completing the above steps, observe the appearance. Figure 5 As shown, because the water-cement ratio is too small, the slurry is relatively thick, and the final stone-like effect is uneven and unnatural, with no color transition, but the surface has a concave and convex three-dimensional effect.

[0123] Comparative Example 4

[0124] 1) Preparation:

[0125] By weight, there are 30 parts of cement, 10 parts of admixture, 30 parts of aggregate, 1% of the pigment of the gel material, 0.2% of the thickener of the gel material, 0.2% of the water reducer of the gel material, 0.1% of the retarder of the gel material, 0.1% of the foaming agent of the gel material, and water is prepared at a water-to-cement ratio of 0.15.

[0126] 2) Preparation of slurry:

[0127] The weighed cement, admixture, aggregate, titanium dioxide, additive and water are placed in a mixer and stirred to form UHPC slurry A with a fluidity of 150 mm;

[0128] The weighed cement, admixture, aggregate, carbon black, additive and water are placed in a mixer and stirred to form UHPC slurry B with a fluidity of 150 mm;

[0129] The base layer can be various cement-based products such as concrete, permeable concrete, and ultra-high performance concrete.

[0130] 3) Spraying: Pour UHPC slurry A and UHPC slurry B into the base layer; the base layer can be various cement-based products such as concrete, permeable concrete, and ultra-high performance concrete.

[0131] 4) Maintenance and post-treatment: After 1-3 days of natural maintenance, the surface is ground, polished and covered.

[0132] After completing the above steps, observe the appearance. Figure 6 As shown, since the slurry is poured directly on the base layer, the stone-like effect is uneven, and the surface layer is relatively flat without a concave-convex three-dimensional effect.

[0133] Comparative Example 5

[0134] Prepare UHPC imitation stone building material structure according to the following steps:

[0135] 1) Preparation:

[0136] By weight, there are 30 parts of cement, 10 parts of admixture, 30 parts of aggregate, 1% of the pigment of the gel material, 0.2% of the thickener of the gel material, 0.2% of the water reducer of the gel material, 0.1% of the retarder of the gel material, 0.1% of the foaming agent of the gel material, and water is prepared at a water-to-cement ratio of 0.15.

[0137] 2) Preparation of slurry:

[0138] The weighed cement, admixture, aggregate, titanium dioxide, additive and water are placed in a mixer and stirred to form UHPC slurry A with a fluidity of 150 mm;

[0139] The weighed cement, admixture, aggregate, carbon black, additive and water are placed in a mixer and stirred to form UHPC slurry B with a fluidity of 150 mm;

[0140] 3) Spraying: Load UHPC slurry A into a multifunctional sprayer, adjust the air pressure to 1.0MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; Load UHPC slurry B into a multifunctional sprayer, adjust the air pressure to 1.0MPa, and directly and evenly spray it on the constructed base layer in the form of dots or granules; the sprayed dots or granules are solidified to form convex spots and granular dots;

[0141] The base layer can be various cement-based products such as concrete, permeable concrete, and ultra-high performance concrete.

[0142] 4) Maintenance and post-treatment: After 1-3 days of natural maintenance, the surface is ground, polished and covered.

[0143] After completing the above steps, the appearance is observed. Since the spraying air pressure used in the spraying step is too high, the final appearance of the surface layer has no imitation stone effect, the surface is relatively flat, and the concave and convex three-dimensional sense is weakened.

[0144] Comparative Example 6

[0145] Prepare UHPC imitation stone building material structure according to the following steps:

[0146] 1) Preparation:

[0147] By weight, there are 30 parts of cement, 10 parts of admixture, 30 parts of aggregate, 1% of the pigment of the gel material, 0.2% of the thickener of the gel material, 0.2% of the water reducer of the gel material, 0.1% of the retarder of the gel material, 0.1% of the foaming agent of the gel material, and water is prepared at a water-to-cement ratio of 0.15.

[0148] 2) Preparation of slurry:

[0149] The weighed cement, admixture, aggregate, titanium dioxide, additive and water are placed in a mixer and stirred to form UHPC slurry A with a fluidity of 150 mm;

[0150] The weighed cement, admixture, aggregate, carbon black, additive and water are placed in a mixer and stirred to form UHPC slurry B with a fluidity of 150 mm;

[0151] 3) Spraying: Load UHPC slurry A into a multifunctional sprayer, adjust the air pressure to 0.1MPa, and evenly spray it on the constructed base layer in the form of dots or granules; Load UHPC slurry B into a multifunctional sprayer, adjust the air pressure to 0.1MPa, and evenly spray it on the constructed base layer in the form of dots or granules; the sprayed dots or granules form convex spots and granular dots after solidification;

[0152] The base layer can be various cement-based products such as concrete, permeable concrete, and ultra-high performance concrete.

[0153] 4) Maintenance and post-treatment: After 1-3 days of natural maintenance, the surface is ground, polished and covered.

[0154] After completing the above steps, the appearance is observed. Since the spraying air pressure used in the spraying step is too low, the final appearance of the surface layer has no color transition, poor stone imitation effect, unnatural, and concave and convex three-dimensional effect.

[0155] Comparative Example 7

[0156] Follow the steps below to prepare the stone-like UHPC panels:

[0157] 1) Preparation of component A: 30 parts of silicate cement, 15 parts of fly ash, 10 parts of mineral powder, 45 parts of quartz sand, 0.75% of titanium dioxide by weight of cement, 0.25% of iron oxide by weight of cement, 0.3% of rubber powder by weight of cement and 0.5% of polycarboxylic acid polymer by weight of cement are added into a stirring pot, and dry stirred for 1 minute, and then 7 parts of water are added, and stirring is continued for 10 minutes to stir into semi-dry concrete particles with continuous gradation of 0.1-20 mm, so as to obtain component A;

[0158] Preparation of component B: 15 parts of silicate cement, 8 parts of fly ash, 4 parts of mineral powder, 22 parts of quartz sand, 0.25% of red iron oxide by weight of cement, 0.75% of iron yellow by weight of cement, 0.3% of glue powder by weight of cement and 0.5% of polycarboxylic acid polymer by weight of cement are added into a mixing pot, dry-stirred for 1 minute, and then 3.5 parts of water are added, and stirring is continued for 10 minutes to stir into semi-dry concrete particles with continuous gradation of 0.1-20 mm, thereby preparing component B;

[0159] 2) Pour component A and component B prepared in step 1 into the same stirring pot at a weight ratio of 1:5, stir for 30 seconds, and mix evenly to obtain a mixed material;

[0160] 3) The mixed material obtained in step 2) is conveyed to the material distribution box of the block forming equipment, and the mixed material is filled into the mold cavity, and then the component A obtained in step 1 is continuously injected into the center area of ​​the mold, and the amount of the injected component A is 20% of the weight of the component B. The vibration frequency is set to 3000 times / min, the pressing pressure is 15MPa, and the pressing is performed for 5s. The block forming equipment is started, and the mixed material in the mold cavity is vibrated and hydraulically pressed to form a 15mm plate;

[0161] 4) After curing at room temperature for 3 days, the prepared plate is ground and polished, and the UHPC plate is obtained after trimming.

[0162] After completing the above steps, observe the appearance and participate in Figure 7 Due to the different processes, Comparative Example 7 adopts a pressing process, and the surface of the prepared board has no concave-convex imitation stone three-dimensional effect; because the raw materials are stirred into a semi-dry concrete particle state, while Example 1 is stirred into a slurry, the color fusion degree of Example 1 is higher than that of Comparative Example 7, and the color boundary is not obvious.

[0163] The flexural performance, anti-skid performance and wear resistance of Examples 1-2 and Comparative Examples 1-6 were tested. The flexural performance of the finishing layer material was tested according to the standard GB / T 17671-1999 "Test Method for Strength of Cement Mortar"; the anti-skid performance was tested according to GB 28635-2012 "Concrete Pavement Bricks"; the surface layer was polished into a fine and smooth surface, and the wear resistance was tested according to the standard GB / T 16925-1997 "Test Method for Abrasion Resistance of Concrete and Its Products"; the impact resistance was tested with reference to the standard GBT17657-2013 "Test Method for Physical and Chemical Properties of Artificial Boards and Faced Artificial Boards", and whether cracks appeared on the surface of the test piece was observed; and the appearance of the imitation stone effect was observed, and the results are shown in Table 1.

[0164] Table 1. Test results

[0165]

[0166] As can be seen from Table 1, the gel material of Comparative Example 1 is all cement, without admixtures. Compared with Example 1, the flexural resistance, wear resistance and impact resistance of Comparative Example 1 are not as good as those of Example 1. The water-cement ratio of Comparative Examples 2 and 3 is too large or too small, resulting in the flexural resistance, wear resistance and impact resistance being far inferior to those of Example 1. The water-cement ratio of Comparative Examples 2 and 3 is too large or too small, resulting in no imitation stone effect, a relatively flat surface, and no concave-convex three-dimensional sense; the water-cement ratio is too small, resulting in an uneven imitation stone effect, unnatural color and no transition. Comparative Example 4 adopts a direct casting molding process. Compared with the spraying process used in Example 1, the imitation stone effect it presents is uneven, the surface is relatively flat, and there is no concave-convex three-dimensional sense. The spraying air pressure of Comparative Examples 5 and 6 is too high or too low. If the spraying air pressure is too high, there is no imitation stone effect, the surface is relatively flat, and the concave-convex three-dimensional sense is reduced; if the spraying air pressure is too low, there is no transition in color, the imitation stone effect is poor, and it is unnatural.

[0167] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A UHPC imitation stone building material structure, characterized in that: It comprises a surface layer and a base layer, wherein the surface layer is located above the base layer, the surface layer is formed by spraying and curing slurry of at least two colors, and the surface layer has at least two convex spots of colors respectively consistent with the colors of the sprayed slurry, and the convex spots are randomly scattered to form an uneven surface; The slurry comprises, by weight, 25-50 parts of cement, 7-35 parts of admixture, 25-50 parts of aggregate, and also comprises pigment and additives; The cement and admixtures constitute the gel material, and the water-to-gel material ratio is 0.14-0.25; The pigment is 0-1%wt of the gel material, and the auxiliary agent is 0.01-1.5%wt of the gel material; The UHPC imitation stone building material structure is prepared by the following steps: 1) Prepare slurry: Put cement, admixture, aggregate, pigment, additive and water in a mixer and stir to form UHPC slurry with a fluidity of 120-200mm; The fluidity of the UHPC slurry is tested according to the cement paste fluidity test method in GB / T8077-2012; Prepare at least two colors of UHPC slurry; 2) Spraying: put one of the slurries into a multifunctional sprayer, adjust the air pressure to 0.2-0.8MPa, and evenly spray it directly on the constructed base layer in the form of dots or particles; then put the remaining slurry into the multifunctional sprayer, and repeat the above steps; the sprayed dots or particles are solidified to form convex spots and particle dots; The average height difference between the highest point and the lowest point on the surface of the surface layer is 0.3-3 mm, and the diameter of the convex spot is 2-30 mm; The color block area of ​​the first color on the surface layer accounts for 25-70% of the total area of ​​the surface layer, wherein the first color is the main color predetermined according to design requirements, and the color block area of ​​the first color is the area of ​​the first color slurry in the surface layer that is sprayed and cured and exposed on the surface.

2. The UHPC imitation stone building material structure according to claim 1, characterized in that: The surface layer also has a plurality of fused color spots formed by cross-fusion of the slurries of different colors.

3. The UHPC imitation stone building material structure according to claim 2, characterized in that: The total area of ​​the fused spots accounts for 25-70% of the total area of ​​the surface layer.

4. The UHPC imitation stone building material structure according to claim 1, characterized in that: The surface layer is also doped with colored aggregate particles, the particle size of the colored aggregate particles is 0.3-3 mm, and the proportion is 5-35%.

5. The UHPC imitation stone building material structure according to claim 4, characterized in that: The colored aggregate particles are solid particle raw materials, and the solid particle raw materials are any one or more of quartz sand, ceramic sand, corundum or ore sand.

6. The UHPC imitation stone building material structure according to claim 1, characterized in that: The surface layer has a thickness of 1-30 mm.

7. The UHPC imitation stone building material structure according to claim 1, characterized in that: The combustion performance grade of the surface layer is A-grade, and the wear resistance is greater than 1.

5. The combustion performance grade is tested according to the GB8624-2012 test method, and the wear resistance is tested according to the GB / T 16925-1997 test method.

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