Preparation method of sprayable colored concrete with gold tailings powder as the whole aggregate

Abstract

The invention discloses a preparation method of sprayable colored concrete using gold tailings powder as the whole aggregate, belonging to the technical field of building materials. The method comprises the following steps: using micron-sized gold tailings powder as the raw material, and preparing gold tailings colored sand in combination with inorganic cementitious materials, inorganic pigments and surface modifiers; mixing and stirring the inorganic cementitious materials, metakaolin and gold tailings colored sand to obtain dry materials; adding a composite admixture into water to obtain an aqueous solution; adding the above aqueous solution into the prepared dry materials and stirring to finally obtain colored concrete. The preparation method of sprayable colored concrete using gold tailings powder as the whole aggregate provided by the invention uses micron-sized gold tailings powder as the whole aggregate of colored concrete, combines the three-primary color principle and designs the ratio of ultrafine sand of three primary colors of red, green and blue through computer simulation, can more conveniently produce colored concrete of required colors, has good color display effect, and improves the efficiency and raw material utilization rate at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and particularly relates to a preparation method of sprayable colored concrete with gold tailing powder as the whole aggregate. Background Art

[0002] With the development of society and the improvement of people's living standards, the monotonous and dull color of traditional concrete is difficult to meet the artistic expressiveness required in places such as museums and exhibition halls. Therefore, colored concrete has emerged. Colored concrete is suitable for decorating the exterior, ground and walls. Without secondary construction, colored concrete products with different artistic effects can be developed according to the architectural design requirements and the creative concepts of designers, which can greatly enrich the colors of the road surface and buildings, and can be naturally coordinated with urban buildings and the surrounding environment to beautify the urban environment. However, it is usually only suitable for large-area construction, and the effect is poor when multiple colors are used in combination. The actual application effect is not ideal. At the same time, the preparation process is relatively complex and the cost is relatively high.

[0003] The preparation raw materials of general colored concrete are basically the same as those of ordinary concrete, except that pigments are added to achieve the coloring effect of concrete. The pigments mainly include inorganic pigments, organic pigments and synthetic pigments. However, it is not easy to disperse the pigments evenly in the cement particles. To achieve a better coloring effect for colored concrete, the mixing time needs to be extended, resulting in a reduction in production efficiency. Moreover, organic pigments are prone to fading under the action of ultraviolet rays, high temperature or rain, and inorganic pigments have low coloring power and poor color brightness. In addition, when the dosage of most pigments is too large, it will have an adverse impact on the properties such as the strength of concrete.

[0004] If colored aggregates are used as the color source of colored concrete, it not only has little impact on the performance of concrete, but also has better color durability. According to the principle of three primary colors, any color can be synthesized from red, green and blue. Therefore, by using this principle to design the proportion of aggregates of the three primary colors, it is convenient to produce sprayable colored concrete of various colors. However, there are the following problems at present. The traditional concrete aggregates are relatively coarse, resulting in poor color rendering effect of the synthesized color. But using too fine sand will lead to too much water demand during the preparation of concrete, resulting in a decrease in strength and durability, and not meeting the engineering requirements. Moreover, sprayable concrete requires short setting time and high early strength of concrete. In addition, the stock of natural colored sand is scarce and the price is expensive. The above factors limit the development of colored concrete. In order to better screen gold ore concentrate, gold mining enterprises grind gold ore very fine. In order to reduce the inventory of tailing ponds, millimeter-sized gold tailing slag is screened out as machine-made sand for use as building sand. However, micron-sized gold tailing powder cannot be reasonably utilized because it does not meet the requirements of building sand and is discharged into the tailing pond, occupying land and polluting the environment. In view of the above problems, the present invention provides a preparation method of sprayable colored concrete with gold tailing powder as the whole aggregate. Summary of the Invention

[0005] The object of the present invention is to provide a preparation method of sprayable colored concrete using gold tailings powder as the whole aggregate, so as to solve the problems of easy damage and fading, poor color display effect and poor strength existing in traditional colored concrete.

[0006] To achieve the above object, the present invention provides a colored concrete using gold tailings powder as the whole aggregate, including the following steps:

[0007] (1) Prepare gold tailings colored sand using micron-sized gold tailings powder as the raw material

[0008] (2) Preparation of sprayable colored concrete

[0009] A. Pour inorganic cementitious material, metakaolin, and gold tailings colored sand into a mixer and stir to obtain a mixed dry material;

[0010] B. Add the composite admixture to 1 / 3 - 1 / 2 of the water and stir evenly;

[0011] C. Add the above aqueous solution to the mixed dry material, stir slowly for 3 minutes and then stand for 3 minutes, and then add 1 / 1 - 2 / 3 of the water to the mixer and stir quickly for 3 minutes to obtain colored concrete.

[0012] Preferably, in the step (2), by mass, the raw material dosages are as follows: 50 - 200 parts of gold tailings colored sand, 90 parts of inorganic cementitious material, 10 parts of metakaolin, 2 - 4 parts of composite admixture, and 20 - 30 parts of water.

[0013] Preferably, in the step (2), the inorganic cementitious material is 42.5R or 52.5R white Portland cement; the composite admixture is composed of a polycarboxylate water reducer and an organosilicon defoaming agent mixed in a weight ratio of 100:3.

[0014] Preferably, the specific operation of the step (1) is as follows:

[0015] a. Add micron-sized gold tailings powder to a coating machine, then add water and a surface modifier, start the coating machine to mix evenly to obtain surface-wet modified gold tailings powder;

[0016] b. Add the inorganic cementitious material to the coating machine, start the coating machine to mix, so that the inorganic cementitious material and inorganic pigments are wrapped on the surface of the modified gold tailings powder to obtain raw colored sand;

[0017] c. Place the prepared raw colored sand in a sealed bag, put it into a curing box at 60 - 70 °C for heat curing for 5 d, and take it out to obtain the finished product of gold tailings colored sand.

[0018] Preferably, in the step (1), by mass parts, the raw material dosages are as follows: 100 parts of gold tailings powder, 7 - 20 parts of inorganic cementitious material, 0.8 - 6 parts of inorganic pigment, 0.2 - 0.6 parts of surface modifier, and 1.4 - 5 parts of water.

[0019] Preferably, the inorganic cementitious material is 42.5R or 52.5R white Portland cement; the inorganic pigment is one of iron oxide red, iron oxide green or Prussian blue; the surface modifier is a polycarboxylate water reducer.

[0020] Preferably, in the step c, the mass of water is 20 - 25% of the mass of the inorganic cementitious material.

[0021] Preferably, in the step c, the rotation speed of the coating machine is 60 r / min, and the rotation time is 15 - 20 min.

[0022] More than 75% of the micron - sized gold tailings powder is transparent quartz minerals (as Figure 1 shown), which is easy to be colored. The present invention performs dyeing treatment on the micron - sized gold tailings powder to obtain three primary color sand grains of red, green and blue. By utilizing the characteristic of fine particles of the gold tailings powder, the color display requirement of colored concrete is realized, making the color of the finished product bright and clear; adding metakaolin can reduce the hydration heat during the hydration process and improve the later - stage strength and durability of the concrete; not only can the added value of solid waste be increased, the production cost of colored concrete be reduced, but also the durability of colored concrete can be improved, the service life of the final product can be extended, and higher design requirements can be met. At the same time, based on the three - primary - color principle and through computer simulation calculation, all colors can be obtained by mixing the three primary colors of red, green and blue in a certain proportion. Therefore, various colors can be formulated by combining the three primary color sand grains of red, green and blue, opening up a new way for the preparation and application of colored concrete, and at the same time, more delicate and complex patterns can be sprayed.

[0023] Therefore, the present invention provides a preparation method of sprayable colored concrete with gold tailings powder as the whole aggregate, and the specific beneficial effects are as follows:

[0024] (1) The present invention uses micron - sized gold tailings powder as the whole aggregate of colored concrete, combines the three - primary - color principle and designs the ratio of the ultra - fine sand of the three primary colors of red, green and blue through computer simulation, can produce colored concrete of the required color more conveniently, has good color display effect, and is beneficial to reducing production processes, improving efficiency and raw material utilization rate;

[0025] (2) The present invention uses gold tailings powder as the whole aggregate of colored concrete, reduces the exploitation of natural colored sand, and saves resources;

[0026] (3) By adjusting raw materials and admixtures, the strength and durability of colored concrete are improved, allowing for the direct spraying of more delicate and complex patterns. At the same time, the service life of the product is extended, meeting higher design requirements.

[0027] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0028] Figure 1 is a brief preparation route diagram of the technology of the present invention;

[0029] Figure 2 Color coordinate distribution diagrams of colored concrete with different ratios of gold tailings powder in Examples 1-6 of the present invention. Detailed Embodiments

[0030] The following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0031] Example 1

[0032] This example provides a preparation method of sprayable red concrete using gold tailings powder as the whole aggregate, specifically including the following steps:

[0033] (1) Preparation of gold tailings pink sand

[0034] a. Add 100 parts of gold tailings powder to a coating machine, then add 4 parts of water and 0.4 part of polycarboxylate superplasticizer, and start the coating machine to mix evenly to obtain surface-wet modified gold tailings powder;

[0035] b. Add 20 parts of 42.5R white Portland cement and 4 parts of iron oxide red to the coating machine, start the coating machine to mix, and rotate at a speed of 60 r / min for 20 min to wrap the inorganic cementitious material and inorganic pigment on the surface of the modified gold tailings powder to obtain the raw material of gold tailings red powder;

[0036] c. Place the prepared raw material of gold tailings red powder in a sealed bag, put it into a curing box at 70 °C for heat curing for 5 d, and take it out to obtain the finished product of gold tailings pink sand.

[0037] (2) Preparation of sprayable colored concrete

[0038] a. Pour 90 parts of 42.5R white Portland cement, 10 parts of metakaolin, and 100 parts of gold tailings pink sand into a mixer and stir for 3 min to obtain a mixed dry material;

[0039] b. Add 3 parts of the composite admixture to 15 parts of water and stir evenly.

[0040] c. Add the above aqueous solution to the mixed dry materials, stir slowly for 3 minutes and then let it stand for 3 minutes. Then add 15 parts of water to the mixer and stir quickly for 3 minutes to obtain red concrete.

[0041] The brief preparation process of this example is as Figure 1 shown. The obtained red concrete has an ideal color effect and good durability. The distribution of the specific finished product color in the 1931 CIE chromaticity diagram is shown at Figure 2 midpoint 1 with color coordinates of (0.62, 0.32).

[0042] Example 2

[0043] This example provides a preparation method of sprayable green concrete using gold tailings powder as the whole aggregate, which specifically includes the following steps:

[0044] (1) Preparation of gold tailings powder green sand

[0045] a. Add 100 parts of gold tailings powder to a coating machine, then add 4 parts of water and 0.4 part of polycarboxylate water reducer, start the coating machine and mix evenly to obtain modified gold tailings powder with a wet surface.

[0046] b. Add 20 parts of 42.5R white Portland cement and 4 parts of iron oxide green to the coating machine, start the coating machine and mix, rotate at a speed of 60 r / min for 20 min to make the inorganic cementitious material and inorganic pigment wrap on the surface of the modified gold tailings powder, and obtain the raw material of gold tailings green powder.

[0047] c. Place the prepared raw material of gold tailings green powder in a sealed bag, put it into a curing box at 70 °C for heat curing for 5 d, and obtain the finished product of gold tailings powder green sand after taking it out.

[0048] (2) Preparation of sprayable green concrete

[0049] a. Pour 90 parts of 42.5R white Portland cement, 10 parts of metakaolin, and 100 parts of gold tailings powder green sand into a mixer and stir for 3 min to obtain mixed dry materials.

[0050] b. Add 3 parts of the composite admixture to 15 parts of water and stir evenly.

[0051] c. Add the above aqueous solution to the mixed dry materials, stir slowly for 3 minutes and then let it stand for 3 minutes. Then add 15 parts of water to the mixer and stir quickly for 3 minutes to obtain green concrete.

[0052] The brief preparation process of this example is as Figure 1As shown, the prepared green concrete has an ideal color effect and good durability. The distribution of the specific finished product color in the 1931 CIE chromaticity diagram is shown in Figure 2 Midpoint 2, with color coordinates of (0.32, 0.58).

[0053] Example 3

[0054] This example provides a preparation method of sprayable blue concrete using gold tailings powder as the whole aggregate, which specifically includes the following steps:

[0055] (1) Preparation of gold tailings powder blue sand

[0056] a. Add 100 parts of gold tailings powder into a coating machine, then add 4 parts of water and 0.4 part of polycarboxylate superplasticizer, start the coating machine and mix evenly to obtain modified gold tailings powder with a wet surface;

[0057] b. Add 20 parts of 42.5R white Portland cement and 4 parts of Prussian blue into the coating machine, start the coating machine and mix, rotate at a speed of 60 r / min for 20 min, so that the inorganic cementitious material and inorganic pigment are wrapped on the surface of the modified gold tailings powder to obtain the raw material of gold tailings blue powder;

[0058] c. Place the prepared raw material of gold tailings blue powder in a sealed bag, put it into a curing box at 70 °C for heat curing for 5 d, and obtain the finished product of gold tailings powder blue sand after taking it out.

[0059] (2) Preparation of sprayable colored concrete

[0060] a. Pour 90 parts of 42.5R white Portland cement, 10 parts of metakaolin, and 100 parts of gold tailings powder blue sand into a mixer and stir for 3 min to obtain a mixed dry material;

[0061] b. Add 3 parts of compound admixture into 15 parts of water and stir evenly;

[0062] c. Add the above aqueous solution into the mixed dry material, stir slowly for 3 minutes and then let it stand for 3 minutes, and then add 15 parts of water into the mixer and stir quickly for 3 minutes to obtain blue concrete.

[0063] The brief preparation process of this example is as shown in Figure 1 As shown, the prepared blue concrete has an ideal color effect and good durability. The distribution of the specific finished product color in the 1931 CIE chromaticity diagram is shown in Figure 2 Midpoint 3, with color coordinates of (0.23, 0.20).

[0064] Example 4

[0065] This example provides a preparation method of sprayable colored concrete using gold tailings powder as the whole aggregate, which specifically includes the following steps:

[0066] (1) Preparation of pink sand from gold tailings

[0067] The specific preparation steps are the same as those in step (1) of Example 1 and will not be repeated here.

[0068] (2) Preparation of blue sand from gold tailings

[0069] The specific preparation steps are the same as those in step (1) of Example 3 and will not be repeated here.

[0070] (3) Preparation of sprayable colored concrete

[0071] a. Pour 90 parts of 52.5R white Portland cement, 10 parts of metakaolin, 68 parts of pink sand from gold tailings, and 52 parts of blue sand from gold tailings into a mixer and stir for 3 min to obtain a mixed dry material;

[0072] b. Add 3 parts of a composite admixture to 14 parts of water and stir evenly;

[0073] c. Add the above aqueous solution to the mixed dry material, stir slowly for 3 minutes, then let it stand for 3 minutes, and then add 14 parts of water to the mixer and stir quickly for 3 minutes to obtain colored concrete.

[0074] The brief preparation process of this example is as shown in Figure 1 The colored concrete prepared has an ideal color effect and good durability. For the distribution of the specific finished product color in the 1931 CIE chromaticity diagram, see Figure 2 point 4, with color coordinates of (0.45, 0.25).

[0075] Example 5

[0076] This example provides a method for preparing sprayable colored concrete using gold tailings powder as the whole aggregate, which specifically includes the following steps:

[0077] (1) Preparation of pink sand from gold tailings

[0078] The specific preparation steps are the same as those in step (1) of Example 1 and will not be repeated here.

[0079] (2) Preparation of green sand from gold tailings

[0080] The specific preparation steps are the same as those in step (1) of Example 2 and will not be repeated here.

[0081] (3) Preparation of sprayable colored concrete

[0082] a. Pour 90 parts of 42.5R white Portland cement, 10 parts of metakaolin, 55 parts of pink sand from gold tailings, and 55 parts of green sand from gold tailings into a mixer and stir for 3 min to obtain a mixed dry material;

[0083] b. Add 3 parts of the composite admixture to 14 parts of water and stir evenly.

[0084] c. Add the above aqueous solution to the mixed dry materials, stir slowly for 3 minutes and then let it stand for 3 minutes. Then add 14 parts of water to the mixer and stir quickly for 3 minutes to obtain colored concrete.

[0085] The brief preparation process of this example is as Figure 1 shown. The obtained concrete has an ideal color effect and good durability. The distribution of the specific finished product color in the 1931 CIE chromaticity diagram can be seen at Figure 2 midpoint 5, with the color coordinates of (0.47, 0.45).

[0086] Example 6

[0087] This example provides a preparation method of sprayable colored concrete using gold tailings powder as the whole aggregate, which specifically includes the following steps:

[0088] (1) Preparation of gold tailings powder green sand

[0089] The specific preparation steps are the same as those in step (1) of Example 2 and will not be repeated here.

[0090] (2) Preparation of gold tailings powder blue sand

[0091] The specific preparation steps are the same as those in step (1) of Example 3 and will not be repeated here.

[0092] (3) Preparation of sprayable colored concrete

[0093] a. Pour 90 parts of 52.5R white Portland cement, 10 parts of metakaolin, 48 parts of gold tailings powder green sand and 52 parts of gold tailings powder blue sand into the mixer and stir for 3 min to obtain mixed dry materials;

[0094] b. Add 3 parts of the composite admixture to 13 parts of water and stir evenly;

[0095] c. Add the above aqueous solution to the mixed dry materials, stir slowly for 3 minutes and then let it stand for 3 minutes. Then add 13 parts of water to the mixer and stir quickly for 3 minutes to obtain colored concrete.

[0096] The brief preparation process of this example is as Figure 1 shown. The obtained colored concrete has an ideal color effect and good durability. The distribution of the specific finished product color in the 1931 CIE chromaticity diagram can be seen at Figure 2 midpoint 6, with the color coordinates of (0.29, 0.39).

[0097] Generally, in the specific application process, the required color is known, simulated by a computer to obtain the proportions of the three required colored sands, and then the required concrete is prepared through the above process and connected to the corresponding machine to achieve concrete spraying.

[0098] The performance of the concrete was tested, and the test results are shown in Table 1.

[0099]

[0100]

[0101] As shown in the above table and Figure 2 As can be seen, colored concrete with controllable color can be prepared by using gold tailing powder with a fineness of micron level dyed into red, green, and blue colored sands. By changing the proportions of the three colored sands, the color coordinates of the required concrete can be adjusted, that is, the color of the colored concrete can be controllably changed. It can be Figure 2 seen that by adjusting the proportion of the colored gold tailing powder, the obtained concrete can change regularly. In addition, since the present invention mainly uses gold tailing powder with a fineness lower than 75μm, which is difficult to be used as a building material, as a raw material, the present invention has a large amount of raw material sources. Moreover, gold tailing powder occupies land and pollutes the environment. Therefore, using it as a raw material in the present invention can also reduce environmental pollution to a certain extent.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing sprayable colored concrete using gold tailings powder as full aggregate, characterized in that: The following steps are involved: (1) Preparation of gold tailings powder sand using micron-sized gold tailings powder as raw material a. Add the micron-sized gold tailings powder into the coating machine, then add water and surface modifier, start the coating machine to mix evenly, and obtain the modified gold tailings powder with moist surface; wherein the fineness of the micron-sized gold tailings powder is less than 75 μm; b. Add the inorganic gelling material and the inorganic pigment into the coating machine, start the coating machine to mix, so that the inorganic gelling material and the inorganic pigment are coated on the surface of the modified gold tailings powder to obtain the raw colored sand; the coating machine speed is 60r / min, and the rotation time is 15~20min; c. Put the prepared colored sand raw material into a sealed bag, put it into a 60-70℃ curing box for heat curing for 5 days, and then take it out to obtain the finished gold tailings powder colored sand; The raw materials used are as follows: 100 parts of gold tailings powder, 7-20 parts of inorganic gelling materials, 0.8-6 parts of inorganic pigments, 0.2-0.6 parts of surface modifiers, and 1.4-5 parts of water; the mass of water is 20-25% of the mass of the inorganic gelling materials; (2) Preparation of sprayable colored concrete A. Pour the inorganic gelling material, metakaolin, and gold tailings powder sand into a mixer and stir to obtain a mixed dry material; B. Add the composite admixture into 1 / 3~1 / 2 of the water and stir evenly; C. Add the above aqueous solution to the mixed dry materials, stir slowly for 3 minutes and then let it stand for 3 minutes, then add 1 / 2~2 / 3 of water into the mixer and stir rapidly for 3 minutes to obtain colored concrete; The raw materials used are as follows: 50-200 parts of gold tailings powder sand, 90 parts of inorganic gelling material, 10 parts of metakaolin, 2-4 parts of composite admixture, and 20-30 parts of water. Colored concrete: The required color is known, and the required proportion of the three colored sands is obtained through computer simulation. The required concrete is then prepared through the above process and connected to the corresponding machine to achieve concrete spraying; In the step (1), the inorganic cementitious material is 42.5R or 52.5R white silicate cement; the inorganic pigment is one of red iron oxide, green iron oxide or Prussian blue; and the surface modifier is a polycarboxylate water reducer; In the step (2), the inorganic cementitious material is 42.5R or 52.5R white silicate cement; and the composite admixture is a mixture of a polycarboxylic acid water reducer and an organosilicon defoamer in a weight ratio of 100:3.

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