Ultrahigh-strength self-compacting concrete for giant special-shaped steel pipe column and preparation method thereof

A technology of dense concrete and special-shaped steel pipes, which is applied in the field of new building materials to achieve excellent performance

Inactive Publication Date: 2019-12-24
CHONGQING CONSTR ENG NEW BUILDING MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an ultra-high-strength self-compacting concrete suitable for giant special-shaped steel pipe columns and a preparation method thereof. The working performance of the concrete meets the first-level self-compacting performance requirements, and the clearance is good, which solves the problem of ultra-high-strength concrete. pumping problem

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0039] The invention provides an ultra-high-strength self-compacting concrete suitable for giant special-shaped steel pipe columns, which is made of the following raw materials in parts by weight: 375 parts of cement, 100 parts of fly ash, 60 parts of mineral powder, 40 parts of silica fume, and 45 parts of expansion agent 1050 parts of gravel, 660 parts of mixed sand, 1.24 parts of super absorbent resin, 140 parts of water, and 16.2 parts of admixture.

[0040] The cement is 52.5R ordinary Portland cement, and the 28d compressive strength is ≥52.5MPa;

[0041] Fly ash is Class I F fly ash, fineness ≤ 12.0%, water demand ≤ 95%, loss on ignition ≤ 5.0%;

[0042] Slag powder is S75 finely ground blast furnace slag powder, 28d activity index ≥ 75%, fluidity ratio ≥ 95%;

[0043] Silica fume SiO 2 Content ≥ 85.0%, water demand ratio ≤ 120%, 7d activity index ≥ 105%;

[0044] The expansion agent is a calcium oxide-magnesia composite expansion agent;

[0045]The particle size of...

Embodiment 2

[0050] The invention provides an ultra-high-strength self-compacting concrete suitable for giant special-shaped steel pipe columns, which is made of the following raw materials in parts by weight: 400 parts of cement, 85 parts of fly ash, 50 parts of mineral powder, 35 parts of silica fume, and 50 parts of expansion agent 1050 parts of gravel, 660 parts of mixed sand, 1.24 parts of superabsorbent resin, 15.8 parts of admixture, and 140 parts of water.

[0051] The cement is 52.5R ordinary Portland cement, and the 28d compressive strength is ≥52.5MPa;

[0052] Fly ash is Class I F fly ash, fineness ≤ 12.0%, water demand ≤ 95%, loss on ignition ≤ 5.0%;

[0053] Slag powder is S75 finely ground blast furnace slag powder, 28d activity index ≥ 75%, fluidity ratio ≥ 95%;

[0054] Silica fume SiO 2 Content ≥ 85.0%, water demand ratio ≤ 120%, 7d activity index ≥ 105%;

[0055] The expansion agent is a calcium oxide-magnesia composite expansion agent;

[0056] The particle size of ...

Embodiment 3

[0061] The invention provides an ultra-high-strength self-compacting concrete suitable for giant special-shaped steel pipe columns, which is made of the following raw materials in parts by weight: 425 parts of cement, 70 parts of fly ash, 40 parts of mineral powder, 30 parts of silica fume, and 55 parts of expansion agent 1050 parts of gravel, 660 parts of mixed sand, 1.24 parts of super absorbent resin, 16.5 parts of admixture, and 140 parts of water.

[0062] The cement is 52.5R ordinary Portland cement, and the 28d compressive strength is ≥52.5MPa;

[0063] Fly ash is Class I F fly ash, fineness ≤ 12.0%, water demand ≤ 95%, loss on ignition ≤ 5.0%;

[0064] Slag powder is S75 finely ground blast furnace slag powder, 28d activity index ≥ 75%, fluidity ratio ≥ 95%;

[0065] Silica fume SiO 2 Content ≥ 85.0%, water demand ratio ≤ 120%, 7d activity index ≥ 105%;

[0066] The expansion agent is a calcium oxide-magnesia composite expansion agent;

[0067] The particle size of...

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to ultrahigh-strength self-compacting concrete suitable for a giant special-shaped steel pipe column and apreparation method thereof. The ultrahigh-strength self-compacting concrete comprises a cementing material, aggregate, super absorbent resin, an additive and water; wherein the cementing material is prepared from 375 to 425 parts of cement, 70 to 120 parts of fly ash, 30 to 60 parts of mineral powder, 30 to 40 parts of silica fume and 45 to 55 parts of expanding agent; the aggregate is prepared from 1000 to 1055 parts of crushed stone and 660 to 710 parts of mixed sand; the super absorbent resin accounts for 0.2% of the total mass part of the cementing material; the concrete also includes 15.8to 16.5 parts of the additive, and 135 to 140 parts of the water. According to the invention, the working performance of the ultrahigh-strength self-compacting concrete meets the first-grade self-compacting performance requirement, the gap passing ability is good, and the ultrahigh-layer pumping problem of the ultrahigh-strength concrete is solved.

Description

technical field [0001] The invention belongs to the technical field of new building materials, and in particular relates to superhigh-strength self-compacting concrete suitable for giant special-shaped steel pipe columns and a preparation method thereof. Background technique [0002] Compared with ordinary concrete, steel pipe concrete has better structural stability and overcomes the weakness of ordinary concrete, so it was popularized and applied all over the world at the end of the 19th century. Our country introduced steel pipe concrete technology in 1960, and more and more steel pipe-concrete composite structures are used in super high-rise buildings and highway bridge construction projects in mountainous areas. With the development of pumping construction technology and construction technology, more and more super high-rise buildings appear, the requirements for the compressive strength of steel tube concrete are getting higher and higher, and the building shape is bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/08C04B18/141C04B18/146C04B22/064C04B22/066C04B14/02C04B14/06C04B24/26C04B2103/302C04B2103/304C04B2103/22
Inventor 石从黎赵海红陈敬李城高艳娜樊先平王春兰
Owner CHONGQING CONSTR ENG NEW BUILDING MATERIALS
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