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High-strength, high-toughness, high-heat conductivity and high-impermeability large-volume concrete and preparation method thereof

A large-volume concrete and high-strength technology, applied in the field of building materials, can solve the problems of easy to achieve compressive strength, high toughness and crack resistance, impermeability, high thermal conductivity and durability indicators, etc., to eliminate temperature cracks and improve Volume stability and durability, effect of promoting form effect

Pending Publication Date: 2018-12-21
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 high toughness, crack resistance, penetration resistance, and high thermal conductivity are difficult to achieve.

Method used

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  • High-strength, high-toughness, high-heat conductivity and high-impermeability large-volume concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step 1, put 1105 parts of crushed stone, 648 parts of sand, 44 parts of silicon powder, 27.5 parts of boron nitride powder, and 1.4 parts of high-strength polyvinyl alcohol fiber into the mixer according to the parts by mass to make it fully mixed evenly;

[0045] In step 2, 384 parts of cement, 55 parts of fly ash, 33 parts of steel slag powder and 8.3 parts of graphene oxide sheet powder are sequentially added to the mixture of step 1 by mass parts and stirred to make it evenly mixed;

[0046] Step 3: Mix 5.5 parts of dispersing activator, 11 parts of polycarboxylate water reducer, 55 parts of modified graphene oxide dispersion and 126.5 parts of water in parts by mass and stir to obtain a mixture;

[0047] Step 4, under stirring, gradually add the mixture prepared in Step 3 to the mixture prepared in Step 2 and stir to obtain high-strength, high-toughness, high-thermal-conductivity, high-impermeability mass concrete.

[0048] The cement that the present invention ado...

Embodiment 2

[0069] Step 1, put 1085 parts of gravel, 610 parts of sand, 45.6 parts of silicon powder, 28.5 parts of boron nitride powder, and 1.4 parts of high-strength polyvinyl alcohol fiber into the mixer according to the parts by mass to make them fully mixed evenly;

[0070] Step 2: Add 397 parts of cement, 57 parts of fly ash, 34 parts of steel slag powder and 9.1 parts of graphene oxide lamellar powder to the mixture in step 1 and stir to make it evenly mixed in parts by mass;

[0071] Step 3: Mix 5.7 parts of dispersing activator, 11.4 parts of polycarboxylate water reducer, 57 parts of modified graphene oxide dispersion and 101 parts of water in parts by mass and stir to obtain a mixture;

[0072] Step 4, under stirring, gradually add the mixture prepared in Step 3 to the mixture prepared in Step 2 and stir to obtain high-strength, high-toughness, high-thermal conductivity, high-impermeability mass concrete.

[0073] Others are the same as embodiment 1.

Embodiment 3

[0075] Step 1, put 1050 parts of gravel, 591 parts of sand, 47 parts of silicon powder, 29.5 parts of boron nitride powder, and 1.5 parts of high-strength polyvinyl alcohol fiber into the mixer according to the number of parts by mass, so that they are fully mixed evenly;

[0076] In step 2, 411 parts of cement, 59 parts of fly ash, 35.4 parts of steel slag powder and 10 parts of graphene oxide sheet powder are sequentially added to the mixture of step 1 by mass parts and stirred to make it evenly mixed;

[0077] Step 3: Mix 5.9 parts of dispersion activator, 11.8 parts of polycarboxylate water reducer, 70 parts of modified graphene oxide dispersion and 118 parts of water according to parts by mass and stir to obtain a mixture;

[0078] Step 4, under stirring, gradually add the mixture prepared in Step 3 to the mixture prepared in Step 2 and stir to obtain high-strength, high-toughness, high-thermal conductivity, high-impermeability mass concrete.

[0079] Others are the same ...

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Abstract

The invention discloses high-strength, high-toughness, high-heat conductivity and high-impermeability large-volume concrete and a preparation method thereof. The high-strength, high-toughness, high-heat conductivity and high-impermeability large-volume concrete comprises cement, fly ash, silicon powder, steel slag powder, boron nitride, graphene oxide flake powder, sand, gravel, high-strength polyvinyl alcohol fiber, a polycarboxylic acid water reducing agent, a dispersion activator, a modified graphene oxide dispersion and water. The obtained concrete has the initial and 28-day-old heat conductivity of 6.26-7.53W / (m.K) and 9.58-12.73W / (m.K) respectively and has the capability of dispersing and conducting cement hydration heat and resisting temperature cracks caused by environment temperature change; 28-day-old concrete has the compressive strength of 87.6-116.7MPa, the rupture strength of 17.6-19.5MPa, the splitting tensile strength of 11.7-12.6MPa, the bending tensile strength of 12.4-13.8MPa and the bending tensile modulus of 45.7-52.5GPa; the water permeability resistance, the chloride ion permeability resistance, the freeze-thaw resistance and the carbonation resistance reachthe highest levels; and the prepared concrete has good social and economic benefits.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to high-strength, high-toughness, high-thermal conductivity, high-impermeability mass concrete and a preparation method thereof. Background technique [0002] Mass concrete refers to the large geometric size of the cast-in-place concrete structure, and technical measures must be taken to solve the problem of cement hydration heat and the resulting volume deformation, so as to minimize the temperature cracks and cracks in the concrete, such as various Various concrete hydropower dams, port terminals, underground concrete structures of high-rise buildings and various large-scale concrete foundation projects are all examples of mass concrete. The important technical problem of mass concrete construction is to control the generation and expansion of temperature cracks. The main reason is that the heat released by the cement hydration reaction during the curing process of co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00293C04B2111/20C04B2111/24C04B2111/72C04B2201/32C04B2201/50C04B18/08C04B18/146C04B18/142C04B16/0641C04B14/327C04B14/024C04B14/06C04B14/02C04B2103/302C04B2103/408
Inventor 吕生华习海涛刘锦茹雷颖
Owner SHAANXI UNIV OF SCI & TECH
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