Wear-resistant material suitable for large-temperature-difference, dry, large-wind-sand and strong-corrosion environment

Abstract

The invention discloses a wear-resistant material suitable for large-temperature-difference, dry, heavy-wind-sand and strong-corrosion environments. The wear-resistant material is prepared by mixing the following raw materials in parts by mass: 20-35 parts of cement, 3-8 parts of a mineral admixture, 40-60 parts of sand, 2.5-5 parts of a functional component and 10-15 parts of water. The wear-resistant material has strong corrosion resistance, high wear resistance and high crack resistance, and is suitable for protecting, repairing and reinforcing the surface layer of a concrete structure in large-temperature-difference, dry, heavy-wind-sand and strong-corrosion environments. Compared with ordinary mortar, the wear resistance is improved by 60% or above, and the salt corrosion resistance is improved by 45% or above.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, in particular to a wear-resistant material suitable for environments with large temperature differences, dryness, strong sandstorms and strong corrosion. Background Art

[0002] Due to the serious degree of soil salinization in the northwest of my country, as well as the large temperature difference, dry climate, and strong wind and sand, the concrete structure is greatly affected by wind erosion and salt erosion, and suffers from many defects such as surface peeling, edge shedding, and severe cracking, which seriously reduces the service life and safety of the concrete structure, making the maintenance task in the northwest of my country heavy, restricting the economic development of the region, and improving the durability of the concrete structure in the region is imperative. At present, the relevant specification system of concrete structure and materials does not have clear pertinence for the design and repair system adopted in specific environments such as large temperature difference, dry climate, strong wind and sand, and saline soil erosion. Under normal circumstances, the surface materials of ordinary concrete structures will suffer durability damage in 1 to 2 years. It is urgent to develop wear-resistant materials suitable for large temperature difference, dryness, strong wind and sand, and strong corrosion environment to protect, reinforce and repair the surface of concrete structures. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a wear-resistant material suitable for large temperature difference, dry, strong wind and sand and strong corrosion environment.

[0004] The above purpose can be achieved through the following technical solutions: A wear-resistant material suitable for large temperature difference, dry, strong wind and sand and strong corrosion environment, characterized in that it is mixed with the following raw materials in mass ratio: 20-35 parts of cement, 3-8 parts of mineral admixture, 40-60 parts of sand, 2.5-5 parts of functional components and 10-15 parts of water.

[0005] And / or, the cement is ferroaluminate cement; And / or, the mineral admixture is slag, the grade of which is not less than S95; and / or, the sand is corundum or quartz sand, with a Mohs hardness of not less than 7 and a maximum particle size of less than 2.36 mm; And / or, the functional component is a combination of a polycarboxylic acid water reducer, an expansion agent, a water retaining agent, and a retarder.

[0006] In some embodiments, the cement has a grade of 42.5, an Al2O3 content in the clinker greater than 30%, and an SiO2 content in the clinker greater than 10%.

[0007] In some embodiments, the expansion agent is a combination of calcium sulfoaluminate and calcium oxide, the water retaining agent is a cellulose compound with a molecular weight greater than 200,000, and the retarder is boric acid.

[0008] And / or, the functional components are composed of 15-20 parts of polycarboxylic acid water-reducing agent, 70-75 parts of expansion agent, 1-5 parts of water-retaining agent, and 8-13 parts of retarder in terms of mass ratio.

[0009] In some embodiments, each of the components is solid powder at room temperature.

[0010] The wear-resistant material prepared by the present invention has high resistance to salt corrosion, high wear resistance, and high crack resistance, and is suitable for surface protection, repair, and reinforcement of concrete structures in environments with large temperature differences, dryness, strong winds and strong corrosion. Compared with ordinary mortar, the wear resistance is improved by more than 60%, and the salt corrosion resistance is improved by more than 45%. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clearly understood, the present invention is further described in detail below in conjunction with preferred embodiments. Here, the illustrative embodiments of the present invention and their description are used to explain the present invention, but are not intended to limit the present invention.

[0012] The present invention first provides a wear-resistant material suitable for large temperature difference, dry, strong wind and sand and strong corrosion environment, which is mixed with the following raw materials: cement, mineral admixture, sand, functional components, water. The principle of achieving high corrosion resistance in the present invention is: the cement uses ferroaluminate cement; by optimizing the raw material components and grading, the mortar density is improved and the corrosive ion permeability is reduced; by the mix ratio design, the mortar shrinkage is reduced and the crack resistance is improved. The principle of achieving high wear resistance is: controlling the proportion of components in cement; optimizing aggregates; controlling water consumption. The principle of being suitable for large temperature difference is: by controlling the cement components and the setting rate, on the one hand, the temperature difference between the inside and outside of the mortar is reduced, and on the other hand, the mortar strength is increased quickly to improve the crack resistance. The principle of being suitable for dry environment is: by optimizing the raw material components and grading, the mortar density is improved and the water loss rate is reduced.

[0013] The specific implementation of the wear-resistant material proposed by the present invention, which is suitable for large temperature difference, dry, strong wind and sand and strong corrosion environment, is described in detail below.

[0014] Embodiment: The components are as follows by weight: 30 parts of 42.5 grade ferroaluminate cement, 5 parts of S95 grade slag, 50 parts of sand, 5 parts of functional components, and 10 parts of water. Among them, the functional components are composed of 15 parts of polycarboxylate water reducer, 75 parts of expansion agent, 2 parts of water retaining agent, and 8 parts of retarder by weight.

[0015] Comparative Example: The cement in the example was replaced with 42.5 grade ordinary Portland cement, and the cement content and other components and their content remained unchanged.

[0016] In order to evaluate the performance of the wear-resistant material proposed by the present invention that is suitable for large temperature difference, dry, strong wind and sand and strong corrosion environment, tests were carried out in various salt solutions according to the "Test Method for Abrasion Resistance of Cement Mortar" (JC / T 421-2004) and the "Test Method for Sulfate Attack Resistance of Cement" (GB / T 749-2008). The test results are shown in Table 1.

[0017]

[0018] It can be seen from Table 1 that, compared with the comparative example, the wear-resistant material prepared by the present invention and suitable for large temperature difference, dry, strong wind and sand and strong corrosion environment has good wear resistance and salt corrosion resistance and excellent performance.

[0019] Illustrative embodiments are described above, and it should be understood that various changes, modifications and improvements will be easily conceived by those skilled in the art. Such changes, modifications and improvements are intended to form a part of the present disclosure and are intended to fall within the spirit and scope of the present invention. Although some examples presented here relate to specific combinations of functions or structures, it should be understood that these functions and structures can be combined in other ways according to the present invention to achieve the same or different purposes. In particular, the actions, elements and features discussed in conjunction with one embodiment are not intended to be excluded from similar or other roles in other embodiments. In addition, the structures and components herein can be further divided into additional components or combined together to form fewer components for performing the same function. Therefore, the foregoing description is only by way of example and is not intended to be limiting, and the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A wear-resistant material suitable for large temperature difference, dry, strong wind and sand and strong corrosion environment, characterized in that: The following raw materials are mixed in a mass ratio: 20-35 parts of cement, 3-8 parts of mineral admixture, 40-60 parts of sand, 2.5-5 parts of functional components, and 10-15 parts of water.

2. The wear-resistant material according to claim 1, characterized in that: The cement is ferroaluminate cement; The mineral admixture is slag, the grade of which is not less than S95; The sand is corundum or quartz sand, with a Mohs hardness of not less than 7 and a maximum particle size of less than 2.36 mm; The functional component is a combination of a polycarboxylic acid water reducer, an expansion agent, a water retaining agent and a retarder.

3. The cement according to claim 2, characterized in that: The cement has a grade of 42.5, an Al2O3 content in the clinker higher than 30%, and an SiO2 content in the clinker higher than 10%.

4. The functional component according to claim 2, characterized in that: The expansion agent is a combination of calcium sulfoaluminate and calcium oxide, the water retaining agent is a cellulose compound with a molecular weight greater than 200,000, and the retarder is boric acid.

5. The functional component according to claim 2, characterized in that: The functional components are composed of 15-20 parts of polycarboxylic acid water reducer, 70-75 parts of expansion agent, 1-5 parts of water retaining agent and 8-13 parts of retarder in terms of mass ratio.

6. The functional component according to claim 4, characterized in that All the components are solid powders at room temperature.

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