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Design method of metakaolin concrete and mix ratio for super-large volume structure

A metakaolin, concrete technology, applied in ratio control, instrumentation, control/regulation system, etc., can solve the problems of structural impermeability, integrity, durability and even unfavorable bearing capacity, harmful cracks, etc.

Active Publication Date: 2019-05-31
云南建投绿色高性能混凝土股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This temperature crack is one of the main factors for early cracking of concrete, and it is often a penetrating harmful crack, which is very detrimental to the impermeability, integrity, durability and even bearing capacity of the structure.

Method used

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  • Design method of metakaolin concrete and mix ratio for super-large volume structure
  • Design method of metakaolin concrete and mix ratio for super-large volume structure
  • Design method of metakaolin concrete and mix ratio for super-large volume structure

Examples

Experimental program
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Effect test

example 1

[0074] The C30 metakaolin concrete used for ultra-large volume structures is composed of crushed stone, high-quality machine-made sand, P·O42.5 cement, II-class fly ash, S75 slag powder, metakaolin, I-type UEA expansion agent, polypropylene fiber, retarding Type polycarboxylate superplasticizer and water are mixed according to a certain ratio. The mass ratio of each component of unilateral concrete is as follows: crushed stone 1025kg, high-quality machine-made sand 839kg, P·O42.5 cement 213kg, grade II powder Coal ash 37kg, S75 slag powder 74kg, metakaolin 22kg, Type I UEA expansion agent 22kg, polypropylene fiber 0.6kg, retarded polycarboxylate superplasticizer 6.26kg, water 176kg. The mix ratio design of concrete is carried out in the following steps: (1) Determine the volume of crushed stone (V g ) and mass (mg), m g =V g ×ρ g =0.3782×2710=1025kg. (2) Determine the volume of fine machine-made sand (V s ) and mass (m s ), m s =V s ×ρ s =0.3108×2700=839kg. (3)...

example 2

[0076] The C35 metakaolin concrete used for super-large volume structures is composed of crushed stone, high-quality machine-made sand, P O42.5 cement, class II fly ash, S75 slag powder, metakaolin, type I UEA expansion agent, polypropylene fiber, retarding Type polycarboxylate superplasticizer and water are mixed according to a certain ratio. The mass ratio of each component of unilateral concrete is as follows: crushed stone 1031kg, high-quality machine-made sand 830kg, P·O42.5 cement 233kg, grade II powder Coal ash 40kg, S75 slag powder 80kg, metakaolin 24kg, type I UEA expansion agent 24kg, polypropylene fiber 0.9kg, retarded polycarboxylate superplasticizer 7.22kg, water 172kg. The mix ratio design of concrete is carried out in the following steps: (1) Determine the volume of crushed stone (V g ) and mass (m g ), m g =V g ×ρ g =0.3763×2740=1031kg. (2) Determine the volume of fine machine-made sand (V s ) and mass (m s ), m s =V s ×ρ s =0.3061×2710=830kg. ...

example 3

[0078] The C40 metakaolin concrete used for super-large volume structures is composed of crushed stone, high-quality machine-made sand, P O42.5 cement, class II fly ash, S75 slag powder, metakaolin, type I UEA expansion agent, polypropylene fiber, retarding Type polycarboxylate superplasticizer and water are mixed according to a certain ratio. The mass ratio of each component of unilateral concrete is as follows: crushed stone 1016kg, high-quality machine-made sand 825kg, P·O42.5 cement 267kg, grade II powder 42kg of coal ash, 64kg of S75 slag powder, 25kg of metakaolin, 25kg of type I UEA expansion agent, 0.9kg of polypropylene fiber, 7.61kg of retarded polycarboxylate superplasticizer, and 168kg of water. The mix ratio design of concrete is carried out in the following steps: (1) Determine the volume of crushed stone (V g ) and mass (mg), m g =V g ×ρ g =0.3764×2700=1016kg. (2) Determine the volume of fine machine-made sand (V s ) and mass (m s ), m s =V s ×ρ s...

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Abstract

The invention discloses metakaolin concrete for oversized structure and a mixing proportion designing method. The metakaolin concrete is prepared by mixing 1016-1072kg of gravel, 825-848kg of refined machine-made sand, 213-282kg of P.O42.5 cement, 37-43kg of II-grade coal ash, 51-80kg of S75 slag powder, 22-26kg of metakaolin, 22-26kg of I-type UEA expanding agent, 0.6-1.5kg of polypropylene fiber, 6.26-8.13kg of coagulation-delaying polycarboxylate superplasticizer and 163-176kg of water. An aggregate close packing model is adopted, and a designing method based on wrapping and filling gravel gaps through mortar and wrapping and filling refined machine-made sand gaps through binding material slurry is adopted, so that close packing of components of the concrete is realized, improvement on strength and fluidity of the concrete is facilitated, and binding material consumption and system hydration heat can be reduced.

Description

technical field [0001] The invention relates to the technical field of concrete preparation, in particular to metakaolin concrete for super-large-volume structures and a design method for its mixing ratio. Background technique [0002] The super-large-volume concrete structure has a large size, and the amount of concrete poured at one time is large. The heat released by cement hydration is difficult to release, which can easily cause the temperature of the internal structure to rise. When a large internal and external temperature difference is formed, cracks will occur inside or on the surface of the concrete. This temperature crack is one of the main factors for early cracking of concrete, and it is often a penetrating harmful crack, which is very detrimental to the impermeability, integrity, durability and even bearing capacity of the structure. In recent years, with the development of super high-rise buildings and industrial buildings, a large number of large raft foundat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C05D11/00C04B103/30
CPCC04B28/04C04B40/0039C04B2103/302G05D11/00C04B18/08C04B18/141C04B14/041C04B16/0633C04B14/02C04B14/06C04B2103/308C04B24/10C04B2103/304C04B2103/50
Inventor 李世华李章建梁丽敏马敏超李翔田帅焦岩赵彦林培仁何云曹蓉姜敏李锐桂进峰
Owner 云南建投绿色高性能混凝土股份有限公司
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