Preparation method of C30 pump concrete with heat resistance of 700 DEG C

Abstract

The invention relates to the technical field of concrete, in particular to a preparation method of C30 pump concrete with heat resistance of 700 DEG C. The preparation method comprises the following steps: S1, preparing materials; and S2, the basalt macadam, the basalt machine-made sand and the natural sand are stirred and mixed, and then the cement, the fly ash and the mineral powder are added for mixing and stirring. S3, finally adding water and a pumping agent, and stirring; s4, taking out a sample from the stirred concrete for sample preparation, and performing compression resistance and heat resistance tests to ensure that the concrete meets design requirements; and S5, the stirred concrete is conveyed to a place needing to be poured through a pump truck, and the concrete is cured. According to the invention, the concrete can meet the construction requirements in a higher-temperature environment, and the application range is widened.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, and in particular to a method for preparing C30 pumping concrete with a heat resistance of 700°C. Background Art

[0002] In the prior art, there is already an invention patent for C40 pumpable concrete with a heat resistance of 500°C. This patent uses a specific mix ratio and preparation process to enable the prepared concrete to withstand a high temperature of 500°C. However, with the continuous improvement of construction requirements, the heat resistance requirements for concrete are also getting higher and higher. Concrete that can withstand a high temperature of 500°C can no longer meet the construction requirements of some buildings. In order to solve this problem, we proposed a preparation method for C30 pumpable concrete with a heat resistance of 700°C. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcoming of the prior art that it cannot withstand high temperatures, and to propose a method for preparing C30 pumped concrete with a heat resistance of 700°C.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for preparing C30 pumped concrete with a heat resistance of 700°C is designed, comprising the following steps:

[0006] S1. Material preparation: The raw materials include: 23-26 parts of cement, 90-100 parts of basalt crushed stone, 70-80 parts of basalt machine-made sand, 20-30 parts of natural sand, 10-12 parts of fly ash, 80-12 parts of mineral powder, 16-17 parts of water, and 1-1.2 parts of pumping agent;

[0007] S2, mixing basalt crushed stone, basalt machine-made sand and natural sand, and then adding cement, fly ash and mineral powder for mixing;

[0008] S3, finally add water and pumping agent and stir;

[0009] S4. Take samples from the mixed concrete for sample preparation and conduct compression and heat resistance tests to ensure that the concrete meets the design requirements;

[0010] S5. Use a pump to transport the mixed concrete to the place where it needs to be poured and maintain it.

[0011] Preferably, the pumping agent includes polycarboxylic acid water-reducing mother liquor, polycarboxylic acid collapse-preserving mother liquor, retarder, air-entraining agent and water, wherein the weight ratio of polycarboxylic acid water-reducing mother liquor, polycarboxylic acid collapse-preserving mother liquor, retarder, air-entraining agent and water is 1:1:0.02:0.005:7.9755.

[0012] Preferably, when performing the heat resistance test, the following steps are included:

[0013] S4.1. Select a cubic sample with a size of 100 mm × 100 mm × 100 mm;

[0014] S4.2. Place the test block after standard curing in an electric constant temperature drying oven and dry it at 110℃ for 24 hours;

[0015] S4.3. Place the dried test piece in a box-type electric furnace and heat it at an average rate of 2℃ / min to 3℃ / min to 700℃. After maintaining the temperature for 3 hours, cool it naturally to room temperature.

[0016] S4.4. After completion, observe the surface of the concrete block, test the weight loss, strength loss and linear shrinkage, and measure the density of the concrete block.

[0017] Preferably, the particle size of the basalt gravel is 5-31.5 mm, the water absorption rate is less than 2.0%, the firmness is greater than 12%, the crushing index is less than 13%, the porosity is less than 45%, the mud content is less than 1.0%, the needle-like particle content is less than 10%, and the mud block content is less than 0.2%.

[0018] The preparation method of C30 pumpable concrete with a heat resistance of 700°C proposed in the present invention has the beneficial effects of: enabling the concrete to meet the construction requirements under higher temperature environments, broadening the scope of application, and ensuring that the heat resistance of the concrete is improved while still maintaining good strength and pumpability; the use of raw materials such as basalt crushed stone and basalt machine-made sand, natural sand, cement and mineral powder significantly improves the heat resistance of the concrete, and at the same time, through precise proportion design, the performance of the concrete is further optimized. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Example 1: A method for preparing C30 pumping concrete with a heat resistance of 700°C, comprising the following steps:

[0021] S1. Preparation of materials, including: 23-26 parts of cement, 90-100 parts of basalt crushed stone, 70-80 parts of basalt machine-made sand, 20-30 parts of natural sand, 10-12 parts of fly ash, 80-12 parts of mineral powder, 16-17 parts of water, and 1-1.2 parts of pumping agent;

[0022] S2, mixing basalt crushed stone, basalt machine-made sand and natural sand, and then adding cement, fly ash and mineral powder for mixing;

[0023] S3, finally add water and pumping agent and stir;

[0024] S4. Take samples from the mixed concrete for sample preparation and conduct compression and heat resistance tests to ensure that the concrete meets the design requirements;

[0025] When conducting a heat resistance test, the following steps are included:

[0026] S4.1. Select a cubic sample with a size of 100 mm × 100 mm × 100 mm;

[0027] S4.2. Place the test block after standard curing in an electric constant temperature drying oven and dry it at 110℃ for 24 hours;

[0028] S4.3. Place the dried test piece in a box-type electric furnace and heat it at an average rate of 2℃ / min to 3℃ / min to 700℃. After maintaining the temperature for 3 hours, cool it naturally to room temperature.

[0029] S4.4. After completion, observe the surface of the concrete block, test the weight loss, strength loss and linear shrinkage, and measure the density of the concrete block.

[0030] S5. Use a pump to transport the mixed concrete to the place where it needs to be poured and maintain it.

[0031] The pumping agent comprises polycarboxylic acid water-reducing mother liquor, polycarboxylic acid collapse-preserving mother liquor, retarder, air-entraining agent and water, wherein the weight ratio of the polycarboxylic acid water-reducing mother liquor, polycarboxylic acid collapse-preserving mother liquor, retarder, air-entraining agent and water is 1:1:0.02:0.005:7.9755.

[0032] The basalt gravel has a particle size of 5-20 mm, a water absorption rate of less than 2.0%, a firmness of more than 12%, a crushing index of less than 13%, a void ratio of less than 45%, a mud content of less than 1.0%, a needle-like particle content of less than 10%, and a mud block content of less than 0.2%.

[0033] The concrete can meet the construction requirements under higher temperature environment, broaden the scope of application, and ensure that the heat resistance of concrete is improved while maintaining good strength and pumpability; the selection of raw materials such as basalt crushed stone, basalt machine-made sand, natural sand, cement and mineral powder significantly improves the heat resistance of concrete. At the same time, through precise proportion design, the performance of concrete is further optimized; and the free water in the internal pores of concrete is reduced, thereby reducing the internal structure damage caused by water evaporation and expansion. This measure improves the high temperature resistance and construction performance of concrete; the pumping agent improves its stability and pumping performance under high temperature environment, which makes the concrete smoother during the pumping process and reduces the construction difficulty and time cost; at the same time, the residual strength of the concrete after high temperature treatment is still maintained at a high level, making the use of concrete in high temperature environment safer and more reliable; the raw materials used, such as basalt crushed stone, basalt machine-made sand, and natural sand, are of stable source and can be mass-produced and sold by mixing stations as commercial concrete. This reduces production costs, improves production efficiency, and makes the concrete of this patent have a wider application prospect.

[0034] Example 2: A method for preparing C30 pumping concrete with a heat resistance of 700°C, comprising the following steps:

[0035] S1. Preparation of materials, including: 23-26 parts of cement, 90-100 parts of basalt crushed stone, 70-80 parts of basalt machine-made sand, 20-30 parts of natural sand, 10-12 parts of fly ash, 80-12 parts of mineral powder, 16-17 parts of water, and 1-1.2 parts of pumping agent;

[0036] S2, mixing basalt crushed stone, basalt machine-made sand and natural sand, and then adding cement, fly ash and mineral powder for mixing;

[0037] S3, finally add water and pumping agent and stir;

[0038] S4. Take samples from the mixed concrete for sample preparation and conduct compression and heat resistance tests to ensure that the concrete meets the design requirements;

[0039] When conducting a heat resistance test, the following steps are included:

[0040] S4.1. Select a cubic sample with a size of 100 mm × 100 mm × 100 mm;

[0041] S4.2. Place the test block after standard curing in an electric constant temperature drying oven and dry it at 110℃ for 24 hours;

[0042] S4.3. Place the dried test piece in a box-type electric furnace and heat it at an average rate of 2℃ / min to 3℃ / min to 700℃. After maintaining the temperature for 3 hours, cool it naturally to room temperature.

[0043] S4.4. After completion, observe the surface of the concrete block, test the weight loss, strength loss and linear shrinkage, and measure the density of the concrete block.

[0044] S5. Use a pump to transport the mixed concrete to the place where it needs to be poured and maintain it.

[0045] The pumping agent comprises polycarboxylic acid water-reducing mother liquor, polycarboxylic acid collapse-preserving mother liquor, retarder, air-entraining agent and water, wherein the weight ratio of the polycarboxylic acid water-reducing mother liquor, polycarboxylic acid collapse-preserving mother liquor, retarder, air-entraining agent and water is 1:1:0.02:0.005:7.9755.

[0046] The basalt gravel has a particle size of 5-20 mm, a water absorption rate of less than 2.0%, a firmness of more than 12%, a crushing index of less than 13%, a void ratio of less than 45%, a mud content of less than 1.0%, a needle-like particle content of less than 10%, and a mud block content of less than 0.2%.

[0047] The concrete can meet the construction requirements under higher temperature environment, broaden the scope of application, and ensure that the heat resistance of concrete is improved while maintaining good strength and pumpability; the selection of raw materials such as basalt crushed stone, basalt machine-made sand, natural sand, cement and mineral powder significantly improves the heat resistance of concrete. At the same time, through precise proportion design, the performance of concrete is further optimized; and the free water in the internal pores of concrete is reduced, thereby reducing the internal structure damage caused by water evaporation and expansion. This measure improves the high temperature resistance and construction performance of concrete; the pumping agent improves its stability and pumping performance under high temperature environment, which makes the concrete smoother during the pumping process and reduces the construction difficulty and time cost; at the same time, the residual strength of the concrete after high temperature treatment is still maintained at a high level, making the use of concrete in high temperature environment safer and more reliable; the raw materials used, such as basalt crushed stone, basalt machine-made sand, and natural sand, are of stable source and can be mass-produced and sold by mixing stations as commercial concrete. This reduces production costs, improves production efficiency, and makes the concrete of this patent have a wider application prospect.

[0048] The following table shows the parameters for heat resistance testing of concrete:

[0049]

[0050]

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing C30 pumped concrete with a heat resistance of 700°C, characterized in that: The following steps are involved: S1. Preparation of materials: raw materials include: 23-26 parts of cement, 90-100 parts of basalt crushed stone, 70-80 parts of basalt machine-made sand, 20-30 parts of natural sand, 10-12 parts of fly ash, 80-12 parts of mineral powder, 16-17 parts of water, and 1-1.2 parts of pumping agent; S2, mixing basalt crushed stone, basalt machine-made sand and natural sand, and then adding cement, fly ash and mineral powder for mixing; S3, finally add water and pumping agent and stir; S4. Take samples from the mixed concrete for sample preparation and conduct compression and heat resistance tests to ensure that the concrete meets the design requirements; S5. Use a pump to transport the mixed concrete to the place where it needs to be poured and maintain it.

2. The method for preparing high heat-resistant pumping concrete according to claim 1, characterized in that: The pumping agent comprises polycarboxylic acid water-reducing mother liquor, polycarboxylic acid collapse-preserving mother liquor, retarder, air-entraining agent and water, wherein the weight ratio of the polycarboxylic acid water-reducing mother liquor, polycarboxylic acid collapse-preserving mother liquor, retarder, air-entraining agent and water is 1:1:0.02:0.005:7.9755.

3. The method for preparing C30 pumped concrete with a heat resistance of 700° C. according to claim 1, characterized in that: When conducting a heat resistance test, the following steps are included: S4.

1. Select a cubic sample with a size of 100 mm × 100 mm × 100 mm; S4.

2. Place the test block after standard curing in an electric constant temperature drying oven and dry it at 110℃ for 24 hours; S4.

3. Place the dried test piece in a box-type electric furnace and heat it at an average rate of 2℃ / min to 3℃ / min to 700℃. After maintaining the temperature for 3 hours, cool it naturally to room temperature. S4.

4. After completion, observe the surface of the concrete block, test the weight loss, strength loss and linear shrinkage, and measure the density of the concrete block.

4. The method for preparing C30 pumped concrete with a heat resistance of 700°C according to any one of claims 1 to 3, characterized in that: The basalt gravel has a particle size of 5-31.5 mm, a water absorption rate of less than 2.0%, a firmness of more than 12%, a crushing index of less than 13%, a void ratio of less than 45%, a mud content of less than 1.0%, a needle-like particle content of less than 10%, and a mud block content of less than 0.2%.

Images