High-toughness, high-permeability-resistance and high-durability concrete for seawater environment and preparation method thereof

A durable concrete and high-toughness technology, applied in the field of building materials, can solve problems such as crack resistance, anti-permeation, and high thermal conductivity and durability indicators that are difficult to achieve, so as to improve strengthening, toughening and permeability resistance, improve dispersion and filling, Good anti-penetration effect

Pending Publication Date: 2019-02-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem at present is still that the indicators such as compressive strength are easy to achieve, and the durability indicators such as crack resistance, penetration resistance, and high thermal conductivity are difficult to achieve.

Method used

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  • High-toughness, high-permeability-resistance and high-durability concrete for seawater environment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1, 660.7 parts of sand, 354.8 parts of cement, 46.6 parts of fly ash, 32 parts of silicon powder, 14 parts of phosphorus slag powder, 18.6 parts of boron nitride powder, and 8.4 parts of low-degree graphene oxide sheet powder are prepared in parts by mass. 1.3 parts of high-strength polyvinyl alcohol fibers and 1125 parts of crushed stones are put into the mixer in turn and stirred to make them fully mixed evenly;

[0042] Step 2: Mix 5.1 parts of dispersing activator, 9.3 parts of polycarboxylate water reducer, 69.9 parts of modified graphene oxide dispersion and 89.6 parts of water in parts by mass and stir to obtain a mixture;

[0043] Step 3: Slowly add the mixture prepared in Step 2 to the mixture prepared in Step 1 under stirring to obtain high-toughness, high-impermeability, and high-durability concrete for seawater environments.

[0044] The cement of the present embodiment is Portland cement of P.O42.5 mark;

[0045] The particle size of the silicon powde...

Embodiment 2

[0064] Step 1, 651 parts of sand, 373.8 parts of cement, 43.7 parts of fly ash, 34 parts of silicon powder, 15 parts of phosphorus slag powder, 19.4 parts of boron nitride powder, and 9.7 parts of low-degree graphene oxide sheet powder are prepared in parts by mass. 1.3 parts of high-strength polyvinyl alcohol fibers and 1110 parts of crushed stones are put into the mixer in turn and stirred to make them fully mixed evenly;

[0065] Step 2: Mix 5.3 parts of dispersion activator, 9.7 parts of polycarboxylate water reducer, 82.6 parts of modified graphene oxide dispersion and 83.2 parts of water according to parts by mass and stir to obtain a mixture;

[0066] Step 3: Slowly add the mixture prepared in Step 2 to the mixture prepared in Step 1 under stirring to obtain high-toughness, high-impermeability, and high-durability concrete for seawater environments. Others are the same as embodiment 1.

Embodiment 3

[0068] Step 1, 618.8 parts of sand, 389.6 parts of cement, 40.5 parts of fly ash, 35.4 parts of silicon powder, 15.2 parts of phosphorus slag powder, 25.3 parts of boron nitride powder, and 11.1 parts of low-degree graphene oxide sheet powder are prepared in parts by mass. 1.4 parts of high-strength polyvinyl alcohol fibers and 1100 parts of crushed stones are put into the mixer in turn and stirred to make them fully mixed evenly;

[0069] Step 2: Mix 5.6 parts of dispersion activator, 10.1 parts of polycarboxylate water reducer, 96.1 parts of modified graphene oxide dispersion and 68 parts of water in parts by mass and stir to obtain a mixture;

[0070] Step 3: Slowly add the mixture prepared in Step 2 to the mixture prepared in Step 1 under stirring to obtain high-toughness, high-impermeability, and high-durability concrete for seawater environments. Others are the same as embodiment 1.

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Abstract

Provided are high-toughness, high-permeability-resistance and high-durability concrete for a seawater environment and a preparation method thereof. The concrete is prepared from cement, fly ash, silica powder, phosphorus slag powder, boron nitride, low-grade graphene oxide lamellar powder, sand, gravel, high-strength polyvinyl alcohol fibers, a polycarboxylic acid water reducer, a dispersing activator, a modified graphene oxide dispersion solution and water. The initial and 28-day age thermal conductivity coefficients of the obtained concrete are 6.85-7.74 W/(m*K) and 10.37-13.63 W/(m.K) respectively; the concrete has the ability to eliminate cracks caused by hydration heat and environmental temperature. The compressive strength of the concrete at 28-day age is 66.8-98.6 MPa, the breakingstrength is 19.5-21.6 MPa, the splitting tensile strength is 12.8-13.5 MPa, the bending tensile strength is 11.5-12.7 MPa, and the bending tensile elasticity modulus is 36.5-41.8 GPa; and the chlorideion penetration, freeze-thawing, carbonization and the like almost have no effect on the properties.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to high-toughness, high-impermeability, and high-durability concrete for seawater environments and a preparation method thereof. Background technique [0002] Concrete for seawater environment mainly refers to bridge piers, bridges, tunnels, ports, wharves, hydropower dams, offshore platforms, sea reclamation and other marine engineering and military facilities with a strength grade of C60~C90. Concrete, the concrete of this grade stage is the mainstream concrete that has been used in the seawater environment in the future. The seawater environment is one of the most severe environmental conditions for concrete. Concrete projects and buildings in the seawater environment are usually not only affected by the penetration of chloride ions, oxygen, water, etc. in the cracks in the concrete, but also It is an urgent and critical issue to improve the toughness, impermeabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/20C04B111/24C04B111/34C04B111/74
CPCC04B28/04C04B2111/00293C04B2111/20C04B2111/24C04B2111/343C04B2111/74C04B2201/32C04B2201/50C04B18/08C04B18/146C04B18/0427C04B14/327C04B14/024C04B14/06C04B16/0641C04B14/048C04B14/14C04B2103/302C04B22/12C04B22/14C04B22/087C04B22/06C04B18/142C04B24/04C04B24/12C04B24/283C04B24/122C04B24/045C04B24/16
Inventor 吕生华习海涛刘锦茹孙立
Owner SHAANXI UNIV OF SCI & TECH
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