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Low-shrinkage and high-adhesion black concrete as well as preparation method and application thereof

A concrete and high-bonding technology, applied in clay preparation devices, chemical instruments and methods, manufacturing tools, etc., can solve the problems of black concrete color instability, affecting concrete workability, color instability, etc., to achieve consistent color The effect of increasing the viscosity of slurry and facilitating construction

Active Publication Date: 2019-01-04
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of the existing black concrete such as unstable color after concrete solidification and molding, expansion deformation and poor cohesiveness, the present invention provides a low-expansion and high-cohesion black concrete and its preparation method and application
[0009] In order to solve the problem of unstable color of existing black concrete after molding, the present invention adopts water-soluble special carbon black with high coloring strength in terms of appearance color and colorant optimization, and improves the color stability of black concrete after molding by optimizing the mix ratio , and because carbon black is added in the preparation process of black concrete, it will seriously affect the workability of concrete. Therefore, the present invention optimizes its mix ratio, adjusts the workability in the concrete construction process, and reasonably controls index parameters such as water consumption and air content. , added polycarboxylate high-performance water reducer and water retention agent and defoamer

Method used

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  • Low-shrinkage and high-adhesion black concrete as well as preparation method and application thereof
  • Low-shrinkage and high-adhesion black concrete as well as preparation method and application thereof
  • Low-shrinkage and high-adhesion black concrete as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The components meet the following indicators:

[0052] Cement: PⅡ52.5 Portland cement, the indicators of cement should meet the national standards;

[0053] Fly ash: Class II ash, water demand ratio ≤ 105%, loss on ignition ≤ 8%, specific surface area ≥ 400m2 / kg;

[0054] Mineral powder: Class II finely ground slag powder, water demand ratio ≤ 100%, loss on ignition ≤ 3%, 28d activity index ≥ 105%, specific surface area ≥ 550m2 / kg;

[0055] Hydration temperature rise inhibitor: use SBT@-TRI concrete hydration temperature rise inhibitor, chloride ion content ≤ 0.05%, 14d adiabatic temperature rise ratio ≥ 90%;

[0056] Expansion agent: Type I calcium sulfoaluminate high-efficiency expansion agent for concrete, and all indicators should meet the national standard GB23439-2009;

[0057] Steel fiber: Rows of hook-shaped steel fibers are bonded with water-soluble glue, the fiber length is 30mm, the aspect ratio is 50, and the tensile strength is not less than 1000MPa;

[...

Embodiment 2

[0076] The components meet the following indicators:

[0077] Cement: PⅡ52.5 Portland cement, the indicators of cement should meet the national standards;

[0078] Fly ash: Class II ash, water demand ratio ≤ 105%, loss on ignition ≤ 8%, specific surface area ≥ 400m2 / kg;

[0079] Mineral powder: Class II finely ground slag powder, water demand ratio ≤ 100%, loss on ignition ≤ 3%, 28d activity index ≥ 105%, specific surface area ≥ 550m2 / kg;

[0080] Hydration temperature rise inhibitor: use SBT@-TRI concrete hydration temperature rise inhibitor, chloride ion content ≤ 0.05%, 14d adiabatic temperature rise ratio ≥ 90%;

[0081] Expansion agent: Type I calcium sulfoaluminate high-efficiency expansion agent for concrete, and all indicators should meet the national standard GB23439-2009;

[0082] Steel fiber: Rows of hook-shaped steel fibers are bonded with water-soluble glue, the fiber length is 25mm, the aspect ratio is 65, and the tensile strength is not less than 1000MPa;

[...

Embodiment 6

[0109] In Example 6, water-retaining agent and defoamer are lacking, and other components are the same as in Example 1. The performance data show that: after the absence of water-retaining agent and defoaming agent in the admixture, the slump and expansion of the concrete slurry increase, and the slurry The body should be segregated in layers, the sand and gravel cannot play the role of the skeleton structure, the gas content of the slurry increases, and its mechanical properties and shrinkage deformation properties are also significantly deteriorated. The water retaining agent has the function of water retention and thickening, which can effectively prevent the workability problems such as slurry segregation and bleeding caused by the increase in the amount of water reducing agent, so as to obtain a better workability, uniform and dense matrix. During the mixing process of the slurry, the defoamer can effectively eliminate the air bubbles in the slurry and control the air cont...

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Abstract

The invention discloses low-shrinkage and high-adhesion black concrete. By compounding carbon black and iron black and adding other components, size of capillary pores of a concrete matrix is reduced,microstructure of the matrix is enabled to be matched with diameter of water-soluble carbon black particles, so that the carbon black particles and iron oxide black powder are fixed better, slurry flowability is adjusted, the concrete is endowed with higher blackness and durability by coupling mechanical fixing and static fixing, and an asphalt bridge surface can keep color consistency for a longtime. Meanwhile, by introducing a water reducing agent and a water retention component, the problem of poor concrete workability caused by high doping amount of carbon black is solved, and slurry viscosity and workability are improved under the condition that strength of the matrix is guaranteed.

Description

technical field [0001] The invention relates to the technical field of new pavement materials, in particular to a black concrete with low shrinkage and high cohesiveness and its preparation method and application. Background technique [0002] The expansion joint device is an important component of the bridge structure. In the bridge structure, the expansion joint is usually set between the two beam ends of the bridge and between the beam end and the bridge abutment. Its function is to adjust the load caused by the vehicle load and the performance of the bridge building material. Connections and displacements between the superstructures. The expansion joints of the bridge deck are usually provided with a post-casting belt, and the post-casting belt is poured with steel fiber concrete with a strength level higher than that of the adjacent original poured concrete. However, due to the large black and white difference between the asphalt surface of the bridge deck and the post...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04B28B1/087B28B1/52B28C5/40E01D19/06
CPCB28B1/0873B28B1/523B28C5/402C04B28/04C04B2111/0075C04B2201/50E01D19/06C04B18/08C04B18/141C04B14/022C04B2103/54C04B14/14C04B14/06C04B2103/302C04B2103/61
Inventor 夏中升沙建芳刘建忠郭飞徐海源
Owner JIANGSU SOBUTE NEW MATERIALS
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