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Heat-resistant high-strength concrete for gradient enclosure structure and preparation method thereof

A technology of heat-resistant concrete and high-strength concrete, applied in the field of building materials, can solve the problem of rapid strength loss, and achieve the effects of improving the interface bonding force, avoiding high-temperature bursting, and promoting the degree of cement hydration.

Active Publication Date: 2019-02-01
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the shortcomings of the existing ordinary silicate heat-resistant concrete in high-temperature environments such as rapid strength loss, the present invention proposes a heat-resistant high-strength concrete with a gradient enclosure structure and a preparation method thereof, which can effectively improve the heat resistance of concrete and reduce the Concrete Strength Loss Rate

Method used

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  • Heat-resistant high-strength concrete for gradient enclosure structure and preparation method thereof
  • Heat-resistant high-strength concrete for gradient enclosure structure and preparation method thereof
  • Heat-resistant high-strength concrete for gradient enclosure structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A heat-resistant high-strength concrete with a gradient maintenance structure, which is composed of an inner layer of high-strength heat-resistant concrete and an outer layer of high-heat-resistant concrete from the inside to the outside (see figure 1 ), where the ratio of the cross-sectional area of ​​the outer layer of high heat-resistant concrete to the inner layer of high-strength heat-resistant concrete is 1:2.5. The mix proportions of the inner high-strength heat-resistant concrete and the outer high-heat-resistant concrete are shown in Table 1 and Table 2 respectively; the test results are shown in Table 3.

[0035] Table 1 The mix ratio of the inner high-strength heat-resistant concrete in Example 1 (kg / m 3 )

[0036]

[0037] Among them, shale ceramsite is used as the light aggregate for internal maintenance, and the bulk density is 830kg / m 3 , simple compressive strength 2.5Mpa, saturated with water 24 hours before the test to drain the water, the additio...

Embodiment 2

[0045] A heat-resistant high-strength concrete with a gradient maintenance structure, which is composed of an inner layer of high-strength heat-resistant concrete and an outer layer of high-heat-resistant concrete from the inside to the outside (see figure 2 ), wherein the ratio of the cross-sectional area of ​​the outer layer of high heat-resistant concrete to the inner layer of high-strength heat-resistant concrete is 1:3.5; the mix ratios of the inner layer of high-strength heat-resistant concrete and the outer layer of high-heat-resistant concrete are shown in Table 4 and Table 5 respectively; The test results are shown in Table 6.

[0046] The mixing ratio of the inner high-strength heat-resistant concrete in Example 2 in Table 4 (kg / m 3 )

[0047]

[0048] Among them, shale ceramsite is used as light aggregate with a bulk density of 750kg / m 3 , simple compressive strength 3.0Mpa, saturated with water 24 hours before the test to drain the water, the addition amount ...

Embodiment 3

[0056] A heat-resistant high-strength concrete with a gradient maintenance structure, which is composed of an inner layer of high-strength heat-resistant concrete and an outer layer of high-heat-resistant concrete from the inside to the outside (see image 3 ), wherein the ratio of the cross-sectional area of ​​the outer layer of high heat-resistant concrete to the inner layer of high-strength heat-resistant concrete is 1:3; the mix ratios of the inner layer of high-strength heat-resistant concrete and the outer layer of high-heat-resistant concrete are shown in Table 7 and Table 8 respectively; The test results are shown in Table 9.

[0057] The mixing ratio of the inner high-strength heat-resistant concrete in Example 3 in Table 7 (kg / m 3 )

[0058]

[0059] Among them, clay ceramsite is used as the light aggregate for internal maintenance, and the bulk density is 950kg / m 3 , simple compressive strength 3.5Mpa, saturated with water for 24 hours before the test to drain ...

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Abstract

The present invention discloses a heat-resistant and high-strength concrete having a gradient enclosing structure. The heat-resistant and high-strength concrete comprises an inner layer high-strength and heat-resistant concrete and an outer layer high heat-resistant concrete from inside to outside, wherein the inner layer high-strength and heat-resistant concrete adopts a silicate-based cement, fly ash, mineral powder, river sand, basalt graded gravel, toughening fiber, a polycarboxylic acid water reducing agent, an inner curing light aggregate and water as raw materials, and the outer layer high heat-resistant concrete adopts an aluminum-based cement, aluminum sand, aluminum stone, hollow fiber, a polycarboxylic acid water reducing agent, an inner curing light aggregate and water as raw materials. According to the present invention, the gradient enclosing structure is designed, such that the generated calcium aluminate and the generated dicalcium aluminate in the outer layer high heat-resistant concrete in the high temperature environment can be converted into the non-hydrated alumina ceramic phase at the high temperature, and the non-hydrated alumina ceramic phase is firmly bonded with the aluminum stone, the aluminum sand and the like so as to significantly increase the high-temperature resistance; and the large doping amount of the fly ash and the mineral powder are used in the inner layer high-strength and heat-resistant concrete, such that the durability is ensured, and the disadvantages of rapid strength loss in the high temperature environment and the like of the existing ordinary silicate heat-resistant concrete can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a gradient enclosure structure heat-resistant concrete and a preparation method thereof. Background technique [0002] Heat-resistant concrete refers to a special high-strength concrete whose physical and mechanical properties are not damaged under the long-term action of high temperature of 200-1300 ° C, and has good resistance to rapid cooling and rapid heating, and has small drying shrinkage and deformation under high temperature. Traditional heat-resistant concrete mostly uses ordinary Portland cement, slag Portland cement, etc. as cementitious materials, and uses crushed natural rock as aggregate. Concrete forms a solid structure after hardening, but the content of alkali such as calcium hydroxide is high, and it will be decomposed into calcium oxide and water at a high temperature of 500 ° C, making the volume of concrete shrink, and then the volume o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/06C04B14/06C04B14/14C04B18/08C04B18/12C04B16/06C04B14/48C04B14/38C04B14/42C04B103/30
CPCC04B28/04C04B28/06C04B2111/763C04B18/08C04B18/12C04B14/068C04B14/14C04B16/0633C04B2103/302C04B14/303C04B14/48C04B16/0683C04B14/4656C04B14/42Y02W30/91
Inventor 黄修林卞周宏黄绍龙彭波唐涛金帆罗霄
Owner HUBEI UNIV
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