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C10 self-compacting concrete and preparation method for same

A self-compacting concrete and concrete technology, applied in the field of building materials, can solve the problems of easily damaged machinery and cutter head, unfavorable shield and pipe jacking construction, and high compressive strength, and achieves a wide range of uses, guarantees work performance, guarantees The effect of construction quality

Inactive Publication Date: 2012-06-20
GUANGDONG FOUND NEW CENTURY CONCRETE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary concrete is made by mixing cement, admixtures, sand, water and admixtures, etc. Generally, it has poor fluidity and high compressive strength (over 20MPa), and it is easy to damage machinery and cutter heads, etc., which is not conducive to shield tunneling. and pipe jacking construction

Method used

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  • C10 self-compacting concrete and preparation method for same
  • C10 self-compacting concrete and preparation method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Concrete mix ratio: 60kg of cement, 250kg of fly ash, 900kg of medium sand, 920kg of 5-10mm stone, 20kg of bentonite, 220kg of water, and 3.3kg of high-performance water reducer. The concrete prepared according to this mix ratio has been applied in the underground pipe jacking enclosure structure of the Nangui Road Station Crossing Tunnel Project of the Guangzhou-Foshan Intercity Rail Transit, with a total production of 600m 3 . The concrete has good workability, the slump reaches 250mm, and the 28-day compressive strength reaches 10.6MPa. There is no water seepage in the concrete diaphragm wall, the jacking machine is normal, and there is no abnormal damage to the cutter head.

Embodiment 2

[0024] Concrete mix ratio: 150kg of cement, 150kg of fly ash, 930kg of medium sand, 940kg of 5-10mm stone, 10kg of bentonite, 190kg of water, and 2.9kg of high-performance water reducer. The concrete prepared according to this mix ratio is used in the GZH-12 standard shield construction of Guangdong Guanhui Intercity Rail Transit Passenger Dedicated Line, and the total production of concrete is about 6500m 3 , the shield machine advances normally, and there is no abnormal damage to the cutter head and cutter head. The slump reaches 240mm, the standard curing is 28 days, and the compressive strength reaches 16.1MPa.

Embodiment 3

[0026] Concrete mix ratio: 50kg of cement, 300kg of fly ash, 850kg of medium sand, 870kg of 5-10mm stone, 50kg of clay powder, 250kg of water, and 4.2kg of high-performance water reducer. The concrete prepared according to this mix ratio has been applied in the pipe jacking ground reinforcement structure of the 220KV Kexiang Road high-voltage overhead line relocation project in Guangzhou City, with a total production of 1500m 3 . The concrete has good workability, the slump reaches 260mm, and the 28-day compressive strength reaches 9.8MPa. There is no water seepage in the concrete diaphragm wall, the jacking machine is normal, and there is no abnormal damage to the cutter head.

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Abstract

The invention discloses C10 self-compacting concrete and a preparation method for the same. The concrete in per cubic meter comprises components in weight of 50-150kg of cement, 150-300kg of fly ash, 10-50kg of bentonite or clay and 190-250kg of water. The compression strength value of the concrete in 28 days ranges from 9MPa to 18MPa, and the initial slump of the concrete exceeds 250mm. In the concrete, a small amount of cement is utilized, a great amount of fly ash is mixed, cohesiveness of the concrete is enhanced by the bentonite or clay powder, and the use amount of aggregate is reasonably adjusted, so that activity effect of the aggregate in the concrete is fully utilized, the working performance and the construction quality of the aggregate are guaranteed, waste resources are effectively utilized, and production cost and environmental pollution are reduced. The C10 self-compacting concrete is wide in application, can be applied to various project positions, and is particularly applicable to projects of a temporary structure and an underground reinforced structure.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a C10 self-compacting concrete and a preparation method thereof. Background technique [0002] Self-compacting concrete (Self Compacting Conctete or Self-Consolidating Concrete referred to as SCC) refers to the ability to flow and compact under its own gravity, even if there are dense steel bars, it can completely fill the formwork, while obtaining good homogeneity, and does not require additional vibrating concrete. [0003] my country uses the symbol C and the standard value of cubic compressive strength (in N / mm 2 or MPa) to indicate the concrete compressive strength grade, a cube with a side length of 150mm is used as the standard size specimen of concrete compressive strength, in humid air or water with a temperature of (20±2)°C and a relative humidity above 95%. After 28 days of medium curing, the compressive strength with a guarantee rate of 95% measured accor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/08
CPCY02W30/91
Inventor 詹国良邓旭华杨智荣彭瑞鸿邱茂生
Owner GUANGDONG FOUND NEW CENTURY CONCRETE
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