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Early-strength dense concrete for shield segment and preparation method of early-strength dense concrete

A technology for compacting concrete and shield segments, which is applied in the field of high-performance concrete, can solve the problems of insufficient concrete slump and expansion, high reinforcement ratio of shield segments, and high price of chemical early-strength agents. effect, increase the difficulty of vibrating, and reduce the effect of steaming time

Pending Publication Date: 2021-01-01
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has some significant disadvantages: high reinforcement ratio in the shield segment, insufficient slump and expansion of concrete or large short-term loss
The price of chemical accelerators is high, and it is impossible to predict whether there will be adverse effects

Method used

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  • Early-strength dense concrete for shield segment and preparation method of early-strength dense concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Mix and stir fly ash, blast furnace slag powder, and water at a mass ratio of 1:2:17 to prepare slurry A, pump slurry A into a vertical stirring ball mill and grind to obtain a median particle size of 0.3-0.5 μm slurry B;

[0031] (2) Get the spherical fly ash after magnetic separation, the slurry B and the homogenizer in the step (1), mix and stir at a mass ratio of 11:20:0.08, and be mixed with a composite slurry mineral admixture C;

[0032] (3) Take 100 parts of ordinary Portland cement, 60 parts of composite slurry mineral admixture C, 48 parts of water, and 0.5 part of water reducer, and fully stir to obtain concrete cementitious material; then add 220 parts of sand and 340 parts of crushed stone in sequence Parts and 0.5 parts of defoaming agent are fully stirred to obtain an early-strength dense concrete for shield segments.

Embodiment 2

[0034](1) Mix and stir fly ash powder, blast furnace slag powder, and water at a mass ratio of 1:2:17 to prepare slurry A, pump slurry A into a vertical stirring ball mill and grind to obtain a median particle size of 0.3-0.5 μm slurry B;

[0035] (2) Get the spherical fly ash after magnetic separation, the slurry B and the homogenizer in the step (1), mix and stir at a mass ratio of 11:20:0.1, and mix it with a composite slurry mineral admixture C;

[0036] (3) Take 130 parts of ordinary Portland cement, 80 parts of composite slurry mineral admixture C, 63 parts of water, and 1.5 parts of water reducing agent, and fully stir to obtain concrete cementitious material; then add 250 parts of sand and 380 parts of crushed stone in sequence 1 part of antifoaming agent and 1 part of defoaming agent are fully stirred to obtain an early-strength compact concrete for shield segment.

Embodiment 3

[0038] (1) Mix and stir fly ash powder, blast furnace slag powder, and water at a mass ratio of 1:2:17 to prepare slurry A, pump slurry A into a vertical stirring ball mill and grind to obtain a median particle size of 0.3-0.5 μm slurry B;

[0039] (2) Get the spherical fly ash after magnetic separation, slurry B and leveling agent in step (1), mix and stir by mass ratio 11:20:0.14, be mixed with composite slurry mineral admixture C;

[0040] (3) Take 120 parts of ordinary Portland cement, 65 parts of composite slurry mineral admixture C, 55 parts of water, and 0.8 parts of water reducer, and stir fully to obtain concrete cementitious material; then add 230 parts of sand and 350 parts of crushed stone in sequence Parts and 0.7 parts of defoaming agent are fully stirred to obtain an early-strength dense concrete for shield segments.

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Abstract

The invention provides early-strength dense concrete for a shield segment and a preparation method of the early-strength dense concrete, and is characterized in that the early-strength dense concretecomprises the following raw materials in parts by weight: 100-130 parts of ordinary Portland cement, 60-80 parts of a composite slurry mineral admixture, 220-250 parts of sand, 340-380 parts of gravels, 0.5-1.5 parts of a water reducer, 48-63 parts of water, 0.5-1 part of a defoamer; and 0.24 to 0.64 part of a homogenizing agent. The concrete for preparing the shield segment has the characteristics of high fluidity, high compactness, excellent impermeability and the like. The early strength of the segment is remarkably improved, the anti-permeability and anti-cracking capacity is high, the steam curing time is shortened, the appearance condition of concrete is improved, and the working performance of the shield segment is guaranteed.

Description

technical field [0001] The invention belongs to the field of high-performance concrete, and in particular relates to an early-strength dense concrete used for a shield segment and a preparation method thereof. Background technique [0002] With the continuous development and expansion of urbanization process and scale. Major cities in our country have successively begun to develop and improve subways and underground spaces, as well as transform urban water conservancy systems. Among them, the shield method construction technology has been widely used in underground tunnel construction due to its advantages of high degree of mechanization, fast construction speed, low impact on the environment and mature technology. The prefabricated shield segment is the main assembly component of shield construction, and is the outermost permanent lining structure of the tunnel, which bears the role of resisting soil pressure, groundwater pressure and some special loads. [0003] As the m...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/02C04B18/08C04B18/14C04B111/34C04B111/27
CPCC04B28/04C04B20/026C04B2201/50C04B2201/52C04B2111/00724C04B2111/27C04B2111/343C04B18/08C04B18/141C04B14/068C04B14/06C04B14/02C04B24/42C04B2103/302C04B24/16Y02W30/91
Inventor 李玉博方娇林贺行洋苏英张权钢张路川雷五宜王迎斌杨进曾三海
Owner HUBEI UNIV OF TECH
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