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A kind of anti-chemical erosion high-strength and high-toughness concrete and its preparation method

A technology of concrete and high toughness, applied in the field of building materials, can solve the problems of unfavorable chemical corrosion resistance of concrete, and achieve the effect of solving poor compatibility, improving ability and good toughness

Active Publication Date: 2019-03-15
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These admixtures have a certain pozzolanic activity and micro-aggregate filling effect, which can improve the compactness of concrete to a certain extent and enhance its impermeability. However, after a large number of mineral admixtures replace Portland cement, the concrete alkalinity and The calcium-silicon ratio of C-S-H gel is reduced, which is not conducive to improving the chemical corrosion resistance of concrete

Method used

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  • A kind of anti-chemical erosion high-strength and high-toughness concrete and its preparation method
  • A kind of anti-chemical erosion high-strength and high-toughness concrete and its preparation method

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preparation example Construction

[0031] 2. Preparation of MCN-LDHs composites

[0032] MCN-LDHs composites were prepared by solid-state pyrolysis reaction. Weigh a certain amount of the CoFeMgAl-TA-LDHs precursor synthesized in the first step of the experiment, and spread it evenly in the porcelain boat, and place the porcelain boat in the heat preservation area of ​​the tubular atmosphere furnace. First, the air in the tube furnace is evacuated by a vacuum pump, and then the N 2 Pass into the tube-type atmosphere furnace until the inside of the tube is at an atmospheric pressure, and then set the temperature rise and control program to make the sample rise to the target temperature at a rate of 5°C / min, and keep feeding N 2 Atmosphere and make the cross-sectional flow of air flow 60ml / cm 2 ·min, start the heating process to make the reaction carbonization temperature reach 823K-1173K (550-900°C), and the time is 2h.

[0033] 3. Preparation of high-strength and high-toughness concrete resistant to chemical...

Embodiment 1

[0038] After the composite functional material is prepared, the method comprising the following steps is used to obtain the chemical erosion-resistant high-strength and high-toughness concrete. Among them, the specific ratio of concrete is selected from the median value of each component.

[0039] 1) Add the MCN-LDHs composite material into the polyacrylate emulsion and stir for 15 minutes to obtain the stirring material A.

[0040] 2) Add the water reducing agent into the water and stir for 30 minutes to obtain the mixing material B.

[0041] 3) After putting the fine aggregate and crushed stone into the concrete mixer and stirring for 15 minutes, slowly pour the polyacrylate emulsion containing MCN-LDHs composite material (mixing material A) into the mixer within 5 minutes, and continue stirring for 10 minutes after pouring, Mixture C is obtained.

[0042] 4) Pour the cement and slag powder into the mixing material C, and after stirring for 15 minutes, the mixing material ...

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Abstract

The invention provides chemical-erosion-resisting, high-strength and high-toughness concrete and a preparation method thereof. The concrete includes cement, river sand or artificial sand, water reducer, water and a composite functional material; the composite functional material includes roasted products, namely carbon nanotubes, of organic matter and a roasted product of layered double-metal hydroxide; the composite functional material is prepared in the step that divalent and tervalent metal salt used for preparing layered double-metal hydroxide, organic matter and metal salt catalysts used for preparing the carbon nanotubes, and alkali metal hydroxides are mixed evenly, then crystallized at 70-150 DEG C and finally calcined at 500-1000 DEG C in an inert atmosphere. According to the concrete and the preparation method thereof, the dispersion problem of the carbon nanotubes in cement materials is solved, and the problems that the compatibility of the carbon nanotubes with the cement materials is poor and the bonding strength of the carbon nanotubes is low. The concrete obtained by the preparation method can cure harmful gas or anions invading from the outside, the toughness and strength of the concrete can be increased, and the durability of the concrete is improved.

Description

technical field [0001] The invention relates to the field of building materials, and belongs to cement-based concrete with ultra-high strength and high toughness against chemical erosion and a preparation method thereof. Background technique [0002] Due to the lack of durability of concrete engineering, it is very common for concrete engineering to suffer from diseases or even serious accidents before reaching the design life in the service environment, resulting in huge economic losses. How to improve the durability of concrete has been highly valued by the field of concrete engineering. [0003] The influencing factors and damage mechanism of concrete durability are complex, most of which are related to the impermeability of concrete, mainly depending on the difficulty of water, harmful liquid and harmful gas transporting to its interior. Among the concrete durability indicators, the carbonation resistance, chloride ion penetration resistance and sulfate erosion resistan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B20/02C04B14/02C04B111/20
CPCC04B14/022C04B20/023C04B28/00C04B2111/20C04B2201/50C04B22/002C04B14/02C04B18/141C04B2103/302C04B24/2641C04B14/00
Inventor 柯国军阳鹏飞甘元初周舟
Owner NANHUA UNIV
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