CN115626799B

CN115626799B - Color permeable concrete and preparation process thereof

Info

Publication number: CN115626799B
Application number: CN202211327505.XA
Authority: CN
Inventors: 陈燕花; 陈敬邦; 王晓锋
Original assignee: Puning Jirun Concrete Co ltd
Current assignee: Puning Jirun Concrete Co ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-12-08
Anticipated expiration: 2042-10-25
Also published as: CN115626799A

Abstract

The application relates to the field of concrete, in particular to color permeable concrete and a preparation process thereof. The color permeable concrete comprises the following raw materials in parts by weight: 0-2% of additive, 85-105 parts of water, 340-375 parts of cement, 20-40 parts of toner, 35-50 parts of admixture, 1200-1300 parts of coarse aggregate, 1-3 parts of polyimide fiber, 0.8-2 parts of polytetrafluoroethylene fiber and 2-5 parts of organosilicon emulsion; the preparation process comprises the following steps: mixing coarse aggregate and cement, and dry-mixing until uniform; continuously adding water, an additive, an admixture, polyimide fibers and polytetrafluoroethylene fibers, and stirring and mixing until the materials are uniform; continuously adding the toner and the organosilicon emulsion, and stirring until the mixture is uniform; obtaining the finished product. The application has the advantage of improving the color stability of the color permeable concrete.

Description

Color permeable concrete and preparation process thereof

Technical Field

The application relates to the field of concrete, in particular to color permeable concrete and a preparation process thereof.

Background

The color concrete is a porous light environment-friendly ground paving material, and can enable rainwater to flow into the ground so as to effectively supplement groundwater; the pollution of oil compounds on the ground to the environment can also be reduced; is a permeable terrace material which can well maintain ecological balance and relieve urban heat island effect, and is beneficial to benign development of human living environment.

Along with the continuous development of economy, people's life is more and more rich, and the aesthetic requirement on urban architecture is gradually improved, so color pervious concrete is derived. The color pervious concrete also has rich colors on the basis of the pervious concrete, and can be matched with the originality of urban building designers to realize the decorative styles required by different environments and individuality.

The color pervious concrete is generally paved in outdoor places such as sidewalks, parks and the like, is exposed outdoors for a long time, and is subjected to continuous effects such as ultraviolet irradiation, rainwater infiltration, human-vehicle friction and the like, so that the color of the color pervious concrete is faded, and the overall quality is influenced. Therefore, there is still a need for improvement.

Disclosure of Invention

In order to improve the color stability of the color pervious concrete, the application provides the color pervious concrete and a preparation process thereof.

In a first aspect, the application provides color pervious concrete, which adopts the following technical scheme:

the color permeable concrete comprises the following raw materials in parts by weight: 0-2% of additive, 85-105 parts of water, 340-375 parts of cement, 20-40 parts of toner, 35-50 parts of admixture, 1200-1300 parts of coarse aggregate, 1-3 parts of polyimide fiber, 0.8-2 parts of polytetrafluoroethylene fiber and 2-5 parts of organosilicon emulsion.

By adopting the technical scheme, under the common cooperation of polyimide fibers and polytetrafluoroethylene fibers, the polyimide fibers and the polytetrafluoroethylene fibers regulate the uniformity of the inside of the system, and improve the distribution state of coarse aggregate, admixture, cement and toner. The method is equivalent to forming a layer of elastic net, and the spreading system networks the coarse aggregate, the cementing material and the toner, so that the toner is not easy to shift after being uniformly dispersed in the system, thereby being beneficial to improving the color stability of the concrete.

In order to maintain good water permeability, the pervious concrete does not use fine aggregate and has many holes inside, but this also directly results in low strength of the pervious concrete. In order to increase the compressive strength as much as possible while maintaining good water permeability, the inventors have made further improvements in the formulation of pervious concrete.

Under the common cooperation of polyimide fiber, polytetrafluoroethylene fiber and organosilicon emulsion, the polyimide fiber and polytetrafluoroethylene fiber are used as a framework, and the organosilicon emulsion spreads on the framework and covers the meshes of the framework under the support of the framework to form a layer of film. The special framework and the cover structure can further improve the hole structure in the system, and play a certain role in separating and supporting the internal connecting holes. The volume of the internal holes is not influenced, but the generation of internal connecting holes of the system can be reduced, so that the strength and the water permeability effect of the color water permeable concrete are ensured.

Because the framework covers the toner network and the organic silicon emulsion on the meshes of the framework, when the color concrete is infiltrated by rainwater, the water permeates downwards and enters into holes in the concrete, and the water quickly slides down after contacting with the films on the surfaces of the holes. The water permeation time is shortened, and the time for water to contact with the inside of the concrete is reduced, so that the service life of the concrete is prolonged; and the erosion and scouring of water to the toner are also reduced, which is beneficial to improving the color stability of the concrete.

Preferably, the mass ratio of the polyimide fiber to the polytetrafluoroethylene fiber to the organosilicon emulsion is (1.5-2.2): (1.0-1.5): (3-4).

By adopting the technical scheme, the mass ratio of the polyimide fiber, the polytetrafluoroethylene fiber and the organosilicon emulsion is further limited, so that the toughness and the stability of the formed film are improved, and the service life and the color stability of the concrete are improved.

Preferably, the coarse aggregate is one or more of guami stone, 1-2 stone, 4-6 stone and 2-4 stone.

By adopting the technical scheme, the grain size of the coarse aggregate is limited within a certain range, so that the porosity in the concrete is not too large or too small, and the uniform pore structure is formed.

Preferably, the coarse aggregate is guami stone and 1-2 stones, and the guami stone and 1-2 stones are mixed according to the mass ratio of 1: (0.05-0.15).

By adopting the technical scheme, the coarse aggregate with specific types and proportions is applied to the system, so that the condition that concentrated stress is locally received when the concrete is pressed is weakened, and the compressive strength is improved.

Preferably, the toner is ferric oxide red powder, and the cement is white cement.

By adopting the technical scheme, the special toner and cement are adopted, so that the color is more vivid, and the color can be kept for a longer time.

Preferably, the admixture is one or more of fly ash, quartz sand and silica fume.

Preferably, the admixture is fly ash and quartz sand, and the mass ratio of the fly ash to the quartz sand is 1: (0.2-0.3).

By adopting the technical scheme, the rate of secondary hydration reaction with cement hydration products can be improved by adopting the admixture with specific types and proportions for mixing, thereby improving the strength of concrete. After the experiment, the influence on the water permeable effect of the permeable concrete is minimum and the strength improvement degree is most obvious.

Preferably, the additive is one or more of water reducing agent, early strength agent and thickener.

In a second aspect, the application provides a preparation process of color pervious concrete, which adopts the following technical scheme: a preparation process of color pervious concrete comprises the following steps:

mixing coarse aggregate and cement, and dry-mixing until uniform;

continuously adding water, an additive, an admixture, polyimide fibers and polytetrafluoroethylene fibers, and stirring and mixing until the materials are uniform;

continuously adding the toner and the organosilicon emulsion, and stirring until the mixture is uniform; obtaining the finished product.

By adopting the technical scheme, the framework is firstly formed and uniformly dispersed in the cement system, then the toner and the organosilicon emulsion are added, the toner is dispersed in the framework and the system, and the organosilicon emulsion plays a role similar to a sealing film, so that the toner is retained, and the color stability is improved. Meanwhile, the organosilicon emulsion is added at last, so that the organosilicon emulsion is coated on the surfaces of the holes, and the service life of the concrete is prolonged.

Preferably, the polyimide fiber and the polytetrafluoroethylene fiber are mixed together;

taking 10-25 parts of deionized water according to parts by weight;

adding polyimide fiber and polytetrafluoroethylene fiber into deionized water at 85-95deg.C, and performing ultrasonic treatment under the conditions of intensity 500W, frequency 18-23KHz and duration 5-10min to obtain standby liquid;

drying the standby liquid to obtain a standby substance;

in the preparation of concrete, the materials to be used are mixed with water, additives and admixtures.

Through adopting above-mentioned technical scheme, carry out pretreatment to polyimide fiber, polytetrafluoroethylene fiber, be favorable to strengthening the skeleton intensity that follow-up formed in the system, also can make organosilicon emulsion have better cooperation effect, combine more firmly.

In summary, the application has the following beneficial effects:

1. under the co-cooperation of polyimide fiber and polytetrafluoroethylene fiber, the two adjust the uniformity of the inside of the system, and improve the distribution state of coarse aggregate, admixture, cement and toner. The method is equivalent to forming a layer of elastic net, and the spreading system networks the coarse aggregate, the cementing material and the toner, so that the toner is not easy to shift after being uniformly dispersed in the system, thereby being beneficial to improving the color stability of the concrete.

2. Under the common cooperation of polyimide fiber, polytetrafluoroethylene fiber and organosilicon emulsion, the polyimide fiber and polytetrafluoroethylene fiber are used as a framework, and the organosilicon emulsion spreads on the framework and covers the meshes of the framework under the support of the framework to form a layer of film. The special framework and the cover structure can further improve the hole structure in the system, and play a certain role in separating and supporting the internal connecting holes. The volume of the internal holes is not influenced, but the generation of internal connecting holes of the system can be reduced, so that the strength and the water permeability effect of the color water permeable concrete are ensured.

3. The special coarse aggregate and the admixture are matched with each other, so that the connection strength of the cementing material to the coarse aggregate is enhanced under the condition of ensuring the water permeability effect, and the condition of local stress concentration of concrete under pressure is greatly weakened.

Detailed Description

The present application will be described in further detail with reference to examples.

The raw materials used in the following examples and comparative examples are all commercially available products.

Preparation example

Preparation example 1

The pretreatment of polyimide fiber and polytetrafluoroethylene fiber comprises the following preparation steps:

step 1): polyimide fibers and polytetrafluoroethylene fibers are mixed together.

Step 2): 10kg of deionized water was weighed and put into a reaction kettle, and the temperature was adjusted to 85 ℃.

Step 3): and (3) putting polyimide fibers and polytetrafluoroethylene fibers into deionized water, and uniformly mixing. Then carrying out ultrasonic treatment under the conditions of the intensity of 500W, the frequency of 18KHz and the duration of 10min to obtain the standby liquid.

Step 4): and drying the standby liquid to obtain a standby substance.

Preparation example 2

The pretreatment of polyimide fibers and polytetrafluoroethylene fibers was different from that of preparation example 1,

weighing 25kg of water and mixing in the step 2); the temperature was adjusted to 95 ℃.

The frequency in the step 3) is 23KHz, and the duration is 5min.

Examples

Example 1

The color pervious concrete comprises the following raw materials: the paint comprises an additive, water, cement, toner, an admixture, coarse aggregate, polyimide fibers, polytetrafluoroethylene fibers and an organosilicon emulsion.

Wherein the additive is a polycarboxylate water reducer, the cement is white cement, and the toner is ferric oxide red powder.

The admixture is fly ash and quartz sand, and the mass ratio of the fly ash to the quartz sand is 1: mixing in a ratio of 0.2. Namely, the usage amount of the fly ash is 33.3kg, and the usage amount of the quartz sand is 6.7kg.

The coarse aggregate is made of guami stone and 1-2 stones, and the mass ratio of the guami stone to the 1-2 stones is 1: mixing in a ratio of 0.05. Namely, the usage amount of the guami stone was 1238kg, and the usage amount of the 1-2 stone was 62kg.

The amounts of the various raw materials are shown in Table 1 in detail.

The embodiment of the application also provides a preparation process of the color permeable concrete, which comprises the following steps:

step 01): and (3) putting the coarse aggregate and the cement into a stirring kettle, and mixing and dry-stirring until the coarse aggregate and the cement are uniform.

Step 02): continuously adding water, an additive, an admixture and a standby object into the stirring kettle, and stirring and mixing until the materials are uniform. The preparation of the standby was carried out according to preparation 1.

Step 03): and continuously adding the toner and the organosilicon emulsion into the stirring kettle in sequence, and stirring until the mixture is uniform to obtain a finished product.

Example 2

The color pervious concrete is different from example 1 in that the toner is chrome oxide green and the cement is Portland cement.

The amounts of the raw materials are different, and are shown in Table 1 in detail.

The process for preparing color pervious concrete is different from example 1 in that the preparation of the ready-to-use material is that of preparation 2.

Example 3

A color pervious concrete differing from example 1 in that the toner was yellow iron oxide.

TABLE 1

Example 4

The color pervious concrete is different from the embodiment 1 in that the mass ratio of polyimide fiber, polytetrafluoroethylene fiber and organosilicon emulsion is 2.2:1.5:3, namely, the polyimide fiber is used in an amount of 2.1kg, the polytetrafluoroethylene fiber is used in an amount of 1.5kg, and the organosilicon emulsion is used in an amount of 2.9kg.

Example 5

The color pervious concrete is different from the embodiment 1 in that the mass ratio of polyimide fiber, polytetrafluoroethylene fiber and organosilicon emulsion is 1:1:2, namely, the polyimide fiber was used in an amount of 1.6kg, the polytetrafluoroethylene fiber was used in an amount of 1.6kg, and the silicone emulsion was used in an amount of 3.3kg.

Example 6

The color pervious concrete is different from example 1 in that the guami stone and 1-2 stones are mixed in a mass ratio of 1: mixing at a ratio of 0.15, namely, using amount of the guami stone of 1130kg and using amount of the 1-2 stone of 170kg.

Example 7

The color pervious concrete is different from example 1 in that the coarse aggregate is guami.

Example 8

The color pervious concrete is different from the concrete in the embodiment 1 in that the mass ratio of fly ash to quartz sand is 1:0.3, namely the use amount of the fly ash is 30kg, and the use amount of the quartz sand is 10kg.

Example 9

The color pervious concrete is different from example 1 in that the admixture is quartz sand.

Example 10

The preparation process of the color pervious concrete is different from the embodiment 1 in that the standby material in the step 2) is replaced by polyimide fiber and polytetrafluoroethylene fiber.

Comparative example

Comparative example 1

A color pervious concrete is different from example 1 in that polyimide fibers are replaced with carbon fibers of equal mass.

Comparative example 2

A color pervious concrete was different from example 1 in that polytetrafluoroethylene fibers were replaced with polyacrylonitrile fibers of equal mass.

Comparative example 3

A color pervious concrete differs from example 1 in that the silicone emulsion is replaced by an equal mass of styrene-acrylic emulsion.

Comparative example 4

The color pervious concrete is different from example 1 in that the polyimide fiber is used in an amount of 0.2kg, the polytetrafluoroethylene fiber is used in an amount of 5kg, and the silicone emulsion is used in an amount of 1.3kg.

Performance test

Detecting a sample: examples 1-10 and comparative examples 1-4.

1. And (3) water permeability detection: and (3) detecting by referring to CJJ/T135-2009 technical Specification of permeable cement concrete pavement, wherein the size of an interface is 200mm by 200mm, and calculating and recording the permeability coefficient.

2. Compressive strength detection: the detection is carried out according to GB/T50081-2002 standard of common concrete mechanical property test method.

3. Color stability detection:

the color taking mode is as follows: the sample was a cylindrical Marshall test piece. And taking three pictures of each sample by using a camera under the condition of good light, and taking pictures with relatively small chromatic aberration by naked eyes. And importing the pictures into Photoshop picture processing software, selecting a color sampler in a custom tool to read the RGB color values of the selected positions, selecting 5 positions for each picture to read, and taking an average value.

The treatment method comprises the following steps: an ultraviolet lamp tube with the power of 50W is selected, and the surface of the detection sample is continuously irradiated for 28d. And (3) spraying clear water for 4 hours every day while irradiating. The temperature was controlled at 60 ℃.

The calculation formula is as follows: color vividness index (%) =three primary color light mode value of each color/(r+g+b)

The above detection results are shown in Table 2.

TABLE 2

As can be seen from comparison of the test data of examples 1-3 and comparative examples 1-3 in Table 2, the test samples of examples 1-3 were better in terms of water permeability coefficient, compressive strength, and color vividness index than those of comparative examples 1-3. In terms of color vividness, the test samples of examples 1 to 3 and comparative examples 1 to 3 were not significantly different in index at the beginning. However, after the treatment, the color vividness index of the products of comparative examples 1 to 3 was greatly lowered, that is, the discoloration was serious; the test samples of examples 1-3, however, still maintained a high level of color vividness index after treatment. The color pervious concrete prepared by the method has higher compressive strength and longer color stability under the condition of keeping good pervious effect under the common cooperation of polyimide fibers, polytetrafluoroethylene fibers and organic silicon emulsion. Based on comparison of the detection data of comparative example 4, polyimide fibers, polytetrafluoroethylene fibers and organosilicon emulsion are required to be used in the application range provided by the application to exert good performance.

As can be seen from comparison of the test data of examples 1, 4 and 5 in Table 2, the test sample of example 5 has better water permeability, compressive strength and color stability, but the test samples of examples 1 and 4 have slightly better effects in the above aspects. The use proportion among polyimide fibers, polytetrafluoroethylene fibers and organic silicon emulsion is further limited, so that the water permeability effect of the product can be effectively improved, and better compressive strength and color stability are maintained.

From comparison of the test data of examples 1, 6 and 7 in Table 2, the test sample of example 7 was slightly better in water permeability effect than examples 1, 6, but inferior to examples 1, 6 in compressive strength and color vividness. As described above, although the water permeability effect of examples 1, 6 was slightly lower than that of example 7, it was still at a good level. It is explained that only the guami stone is used, although the water permeability effect can be improved, the compressive strength is slightly lowered. Through multiple experiments, the inventor can obtain the color pervious concrete with better quality in three aspects of water pervious effect, compressive strength and color stability under the selection and proportion matching of the specific coarse aggregate.

From comparison of the test data of examples 1, 8 and 9 in Table 2, the water penetration effect, compressive strength and color stability of examples 1 and 8 are all better than those of example 9, which shows that the specific type and proportion of the admixture is beneficial to improving the structure of the system.

As can be seen from comparison of the test data of examples 1 and 10 in Table 2, the concrete prepared in example 1 has better water permeability, compressive strength and color stability than those of example 10, which means that the advanced dispersion treatment of polyimide fibers and polytetrafluoroethylene fibers is favorable for the subsequent coordination of the polyimide fibers and polytetrafluoroethylene fibers with the organosilicon emulsion in the system, and forms more stable films and structures.

The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.

Claims

1. The color permeable concrete is characterized by comprising the following raw materials in parts by weight: 0-2% of additive, 85-105 parts of water, 340-375 parts of cement, 20-40 parts of toner, 35-50 parts of admixture, 1200-1300 parts of coarse aggregate, 1-3 parts of polyimide fiber, 0.8-2 parts of polytetrafluoroethylene fiber and 2-5 parts of organosilicon emulsion;

the mass ratio of the polyimide fiber to the polytetrafluoroethylene fiber to the organosilicon emulsion is (1.5-2.2): (1.0-1.5): (3-4).

2. The color pervious concrete of claim 1, wherein: the coarse aggregate is one or more of guami stone, 1-2 stone, 4-6 stone and 2-4 stone.

3. The color pervious concrete of claim 2, wherein: the coarse aggregate is made of guami stone and 1-2 stones, wherein the mass ratio of the guami stone to the 1-2 stones is (1): (0.05-0.15).

4. The color pervious concrete of claim 1, wherein: the toner is ferric oxide red powder, and the cement is white cement.

5. A coloured pervious concrete according to claim 2 or 3, characterised in that: the admixture is one or more of fly ash, quartz sand and silica fume.

6. The color pervious concrete of claim 5, wherein: the admixture is fly ash and quartz sand, and the mass ratio of the fly ash to the quartz sand is 1: (0.2-0.3).

7. A process for the preparation of coloured pervious concrete according to any one of claims 1 to 6, characterised in that it comprises the following steps:

mixing coarse aggregate and cement, and dry-mixing until uniform;

8. The process for preparing color pervious concrete according to claim 7, wherein: mixing the polyimide fibers and the polytetrafluoroethylene fibers together;

taking 10-25 parts of deionized water according to parts by weight;

drying the standby liquid to obtain a standby substance;