Concrete material with good heat dissipation performance

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a concrete material with good heat dissipation performance. The steel slag is used as the aggregate, and the metal oxide and the like in the steel slag have good heat-conducting property and can promote rapid transfer of heat; due to the addition of the admixture, the use amount of cement is reduced, a certain amount of cementing material is reduced, hydration heat can be reduced, meanwhile, calcium hydroxide and a product calcium oxide thereof in concrete slurry can be consumed, more datolite can be generated, defects occurring in the concrete are improved, and therefore the heat dissipation performance of the concrete is improved; besides, the water reducing agent is selected from calcium lignosulphonate and sodium alkyl sulfate, so that synergistic interaction can be generated, the water consumption is further reduced, the hydration heat is reduced, meanwhile, the fluidity of the concrete is improved, the concrete is more uniform in the pouring process, internal nonuniformity and thermal stress concentration are reduced, and the service life of the concrete is prolonged. And uniform distribution and dissipation of heat are facilitated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and particularly relates to a concrete material with good heat dissipation performance. BACKGROUND

[0002] With the continuous development of the construction industry, mass concrete is increasingly widely applied in high-rise building foundations, large equipment foundations, water conservancy dams, large ship locks and other projects. Due to the large volume of mass concrete, its surface coefficient is relatively small, the heat dissipation surface is limited, the internal temperature rises quickly, the cement hydration heat is concentrated and released, and it is not easy to dissipate in time. Under the constraint of external environment or internal force of the concrete, temperature shrinkage cracks are easily generated, which affects the structural safety and normal use. Therefore, it is particularly important to take reasonable measures to control the internal temperature of mass concrete during construction. In the traditional technology, cooling water circulation is usually used to dissipate heat of the concrete, but this method has many deficiencies. For example, a heat dissipation device for concrete construction disclosed in Chinese patent CN 216039320 U arranges a cooling pipe in a serpentine shape in the concrete, and uses a cold water tank to transport cooling water for heat dissipation. However, in mass concrete, the concrete span is large, and the temperature of the cooling water gradually rises during transportation, which reduces the heat dissipation effect of the concrete on the rear side of the cooling water transportation direction and causes uneven heat dissipation. Based on this, how to improve the heat dissipation performance of the concrete has become a technical problem to be solved. SUMMARY

[0003] The purpose of the present application is to provide a concrete material with good heat dissipation performance, which effectively improves the heat dissipation performance of the concrete.

[0004] The present application provides a concrete material with good heat dissipation performance, which comprises the following components in parts by weight: 1100-1300 parts of steel slag, 600-700 parts of fine aggregate, 250-350 parts of Portland cement, 100-200 parts of admixture, 6-10 parts of water reducing agent and 125-140 parts of water; the water reducing agent is a mixture of calcium lignosulfonate and sodium fatty alcohol sulfate.

[0005] Preferably, the particle size of the steel slag is 15-30 μm.

[0006] Preferably, the fine aggregate is fine sand with a particle size of ≤3.5 mm.

[0007] Preferably, the admixture is fly ash.

[0008] Preferably, the air entraining agent is sodium fatty alcohol sulfate.

[0009] Preferably, the mass ratio of calcium lignosulfonate to sodium fatty alcohol sulfate is 1:1-3.

[0010] The application further provides a preparation method of the concrete material, and comprises the following steps: After the steel slag and the admixture are mixed and sintered, the fine aggregate and the Portland cement are mixed uniformly to obtain a solid mixture; The water reducing agent is mixed with water and then added into the solid mixture and stirred uniformly.

[0011] Preferably, the sintering temperature is 800-1300 DEG C, and the sintering time is 1 h.

[0012] Preferably, the sintering temperature is 800-1300 DEG C, and the sintering time is 1 h.

[0013] The application has the following beneficial effects: The concrete uses the steel slag as the aggregate, on one hand, the resource is recycled, on the other hand, the metal oxides, dicalcium silicate, tricalcium silicate and dicalcium ferrite contained in the steel slag have good heat conduction performance and can promote the rapid heat transfer; in addition, the steel slag aggregate has high strength and good wear resistance, and the concrete prepared by using the steel slag as the aggregate has high strength and good wear resistance.

[0014] The admixture can consume calcium hydroxide and its product calcium oxide in the concrete slurry and generate more tobermorite (high-temperature-resistant phase), which is beneficial to improve the defects in the concrete and thus improve the heat dissipation performance of the concrete.

[0015] The addition of the fly ash reduces the amount of cement, reduces a certain amount of cementitious material, is beneficial to reduce the hydration heat, and can also improve the density and early strength of the concrete, reduce the temperature rise and indirectly improve the heat conduction performance.

[0016] The water reducing agent is selected as calcium lignosulfonate and sodium fatty alcohol sulfate, which can reduce the surface tension of water, introduce a large number of micro-bubbles, reduce the bleeding and segregation of the concrete mixture, and the combination of the two can produce a synergistic effect, greatly improve the water-reducing rate, effectively reduce the water content in the concrete, improve the density of the concrete and indirectly improve the heat conduction performance.

[0017] The application uses sodium fatty alcohol sulfate and calcium lignosulfonate as the water reducing agent in the mass concrete, which can also improve the fluidity and workability of the concrete, reduce the water content, inhibit the loss of slump and improve the engineering quality. Too much calcium lignosulfonate may reduce the strength of the concrete, the introduction of sodium fatty alcohol sulfate can replace a part of the calcium lignosulfonate and reduce the amount of the calcium lignosulfonate, which can improve the heat dissipation performance of the concrete, and effectively improve the strength and durability of the concrete.

[0018] In addition, the sodium fatty alcohol sulfate also has certain air entraining property, can introduce micro air bubbles, increase the porosity of the concrete, reduce the thermal conductivity, and improve the thermal conductivity.

[0019] The steel slag and the admixture are sintered first, and then mixed with other raw materials to prepare the concrete, the steel slag and the admixture are sintered, can fully react, and then generate more cementitious minerals, so that the stable steel slag is obtained, and the thermal conductivity of the concrete is further improved. DETAILED DESCRIPTION

[0020] In order to further illustrate the present application, a kind of concrete material with good heat dissipation performance provided by the present application is described in detail below in conjunction with examples, but they cannot be understood as limiting the scope of protection of the present application.

[0021] In the embodiments of the present application, unless otherwise specified, the materials used are conventional commercially available products.

[0022] Example 1 Take 1200 parts of steel slag and 200 parts of fly ash, mix uniformly, and then heat to 1200℃ at a rate of 250℃ / min, and keep for 1h;After cooling, 600 parts of fine sand with a particle size of 2.5mm and 250 parts of Portland cement are added and mixed uniformly to obtain a solid mixture; Take 5 parts of calcium lignosulfonate and 5 parts of sodium fatty alcohol sulfate, add 125 parts of water, mix uniformly, and then add the solid mixture to stir uniformly to obtain the concrete material.

[0023] Example 2 Take 1200 parts of steel slag and 150 parts of fly ash, mix uniformly, and then heat to 1200℃ at a rate of 250℃ / min, and keep for 1h;After cooling, 600 parts of fine sand with a particle size of 2.5mm and 300 parts of Portland cement are added and mixed uniformly to obtain a solid mixture; Take 4 parts of calcium lignosulfonate and 6 parts of sodium fatty alcohol sulfate, add 130 parts of water, mix uniformly, and then add the solid mixture to stir uniformly to obtain the concrete material.

[0024] Example 3 Take 1200 parts of steel slag and 100 parts of fly ash, mix uniformly, and then heat to 1200℃ at a rate of 250℃ / min, and keep for 1h;After cooling, 600 parts of fine sand with a particle size of 2.5mm and 350 parts of Portland cement are added and mixed uniformly to obtain a solid mixture; Take 3 parts of calcium lignosulfonate and 6 parts of sodium fatty alcohol sulfate, add 130 parts of water, mix uniformly, and then add the solid mixture to stir uniformly to obtain the concrete material.

[0025] Example 4 Take 1200 parts of steel slag and 200 parts of fly ash, mix uniformly, and heat to 1200°C at a rate of 250°C / min, and keep for 1 h; after cooling, add 600 parts of fine sand with a particle size of 2.5 mm and 250 parts of portland cement to mix uniformly, to obtain a solid mixture; Take 2 parts of calcium lignosulfonate and 6 parts of sodium fatty alcohol sulfate, add 140 parts of water, mix uniformly, and then add to the solid mixture to stir uniformly, to obtain a concrete material.

[0026] Comparative Example 1 Take 1200 parts of steel slag, heat to 1200°C at a rate of 250°C / min, and keep for 1 h; after cooling, add 600 parts of fine sand with a particle size of 2.5 mm and 450 parts of portland cement to mix uniformly, to obtain a solid mixture; Take 5 parts of calcium lignosulfonate and 5 parts of sodium fatty alcohol sulfate, add 125 parts of water, mix uniformly, and then add to the solid mixture to stir uniformly, to obtain a concrete material.

[0027] Comparative Example 2 Take 1200 parts of steel slag and 200 parts of fly ash, add 600 parts of fine sand with a particle size of 2.5 mm and 250 parts of portland cement to mix uniformly, to obtain a solid mixture; Take 5 parts of calcium lignosulfonate and 5 parts of sodium fatty alcohol sulfate, add 125 parts of water, mix uniformly, and then add to the solid mixture to stir uniformly, to obtain a concrete material.

[0028] Comparative Example 3 Take 1200 parts of steel slag and 200 parts of fly ash, mix uniformly, and heat to 1200°C at a rate of 250°C / min, and keep for 1 h; after cooling, add 600 parts of fine sand with a particle size of 2.5 mm and 250 parts of portland cement to mix uniformly, to obtain a solid mixture; Take 10 parts of calcium lignosulfonate, add 150 parts of water, mix uniformly, and then add to the solid mixture to stir uniformly, to obtain a concrete material.

[0029] Comparative Example 4 Take 1200 parts of steel slag and 200 parts of fly ash, mix uniformly, and heat to 1200°C at a rate of 250°C / min, and keep for 1 h; after cooling, add 600 parts of fine sand with a particle size of 2.5 mm and 250 parts of portland cement to mix uniformly, to obtain a solid mixture; Take 10 parts of sodium fatty alcohol sulfate, add 150 parts of water, mix uniformly, and then add to the solid mixture to stir uniformly, to obtain a concrete material.

[0030] Comparative Example 5 Take 1200 parts of steel slag and 200 parts of fly ash, mix them evenly, and then heat them to 1200℃ at a rate of 250℃ / min, and keep the temperature for 1h; after cooling, add 600 parts of fine sand with a particle size of 2.5mm and 250 parts of Portland cement, mix them evenly, and obtain a solid mixture; Take 6 parts of calcium lignosulfonate and 4 parts of sodium fatty alcohol sulfate, add 125 parts of water, mix them evenly, and then add them to the solid mixture and stir them evenly to obtain a concrete material.

[0031] Comparative Example 6 Take 1200 parts of steel slag and 200 parts of fly ash, mix them evenly, and then heat them to 1200℃ at a rate of 250℃ / min, and keep the temperature for 1h; after cooling, add 600 parts of fine sand with a particle size of 2.5mm and 250 parts of Portland cement, mix them evenly, and obtain a solid mixture; Take 2 parts of calcium lignosulfonate and 8 parts of sodium fatty alcohol sulfate, add 125 parts of water, mix them evenly, and then add them to the solid mixture and stir them evenly to obtain a concrete material.

[0032] Test Example 1 The concrete materials prepared in Examples 1-4 and Comparative Examples 1-6 are used as samples, and their compressive strength and tensile strength are detected, and the results are shown in Table 1.

[0033] Table 1 Compressive strength and tensile strength of concrete materials

[0034] The maximum hydration heat temperature rise value, the maximum adiabatic temperature rise value, and the cooling rate of each sample are measured, and the results are shown in Table 2.

[0035] Table 2 Temperature rise and cooling of concrete materials

[0036] As can be seen from Table 1 and Table 2, compared with the comparative examples, the maximum hydration heat temperature rise value of the concrete material of the examples is significantly reduced, and the cooling rate is significantly improved, so the concrete provided by the present application has good heat dissipation performance; in the hydration process of the concrete, the heat generated inside is more effectively controlled, and the concrete can reach a thermal equilibrium state more quickly after being poured.

[0037] At the same time, the concrete material of the examples of the present application also has higher compressive strength and higher tensile strength, which shows that the concrete material of the present application can better maintain the integrity and stability of the structure when bearing a larger load, which is particularly important for large structures such as high-rise buildings and bridges; and high tensile strength helps to improve the crack resistance of concrete and reduce the generation of cracks caused by tensile stress, which also has a positive effect on improving the waterproofness and impermeability of concrete.

[0038] Although the above embodiments have been described in detail, it should be understood that these are only some embodiments of the present application, but not all embodiments. Other embodiments can be obtained on the basis of the above embodiments without creativity, and these embodiments all belong to the protection scope of the present application.

Claims

1. A concrete material with good heat dissipation performance, characterized in that, By weight, it includes the following components: 1100-1300 parts steel slag, 600-700 parts fine aggregate, 250-350 parts silicate cement, 100-200 parts admixture, 6-10 parts water-reducing agent and 125-140 parts water. The water-reducing agent is a mixture of calcium lignosulfonate and sodium fatty alcohol sulfate.

2. The concrete material according to claim 1, characterized in that, The particle size of the steel slag is 15~30μm.

3. The concrete material according to claim 1, characterized in that, The fine aggregate is fine sand with a particle size ≤ 3.5 mm.

4. The concrete material according to claim 1, characterized in that, The admixture is fly ash.

5. The concrete material according to claim 1, characterized in that, The air-entraining agent is sodium fatty alcohol sulfate.

6. The concrete material according to claim 1, characterized in that, The mass ratio of calcium lignosulfonate to sodium fatty alcohol sulfate is 1:1~3.

7. The method for preparing the concrete material according to any one of claims 1 to 6, characterized in that, Includes the following steps: After steel slag and admixtures are mixed and sintered, they are then mixed evenly with fine aggregates and silicate cement to obtain a solid mixture. Mix the water-reducing agent with water, add it to the solid mixture, and stir until well combined.

8. The method according to claim 7, characterized in that, The sintering temperature is 800℃~1300℃, and the sintering time is 1 hour.

9. The method according to claim 7, characterized in that, The sintering heating rate is 200~300℃ / min.

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