Large-flow-state circumferential inverted arch thin-wall anti-crack concrete and preparation method thereof

A concrete and hoop technology, applied in the field of concrete, can solve problems such as concrete cracking

Active Publication Date: 2021-05-28
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, measures such as adding expansion agents, fibers, and low-heat, low-shrinkage concrete mix ratios are commonly used to prevent the above-mentioned probl

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048]Example 1

[0049]Provides a large-flow ring-to-edge thin-walled anti-crack concrete, according to weight parts, including the following raw materials:

[0050]Ordinary silicate cement, 220 copies;

[0051]Fly ash, 40 copies;

[0052]Mine powder, 80 copies;

[0053]Silica ash, 20 copies;

[0054]Raw bones, 700 copies;

[0055]Modified ceramics, 300 copies;

[0056]Fine aggregate, 600 copies;

[0057]Modified rubber particles, 30 copies;

[0058]Thickener, 1.5 parts;

[0059]Polycarboxylic acid water water reducer, 7.2 parts;

[0060]Polypropylene fiber, 1.6 parts;

[0061]Intensive agent, 3 copies;

[0062]Hydrophone ratio, 0.4;

[0063]In the above formulation, each component parameter index is:

[0064]Preparation of modified cerams: first soaked in water for 24 h, then mixed in a mixture of 42.5 ordinary silicate cement and expansion agents from 1: 0.11, and the mixture of two mass fractions of 0.1% beam-shaped polypropylene mesh fibers. However, the mass ratio of the total mass of the ceramics and cement, expansion, and...

Example Embodiment

[0079]Example 2

[0080]Provides a large-flow ring-to-edge thin-walled anti-crack concrete, according to weight parts, including the following raw materials:

[0081]Ordinary silicate cement, 240 copies;

[0082]Fly ash, 45 copies;

[0083]Mine powder, 90 copies;

[0084]Silica ash, 26 copies;

[0085]Raw bone, 750 copies;

[0086]Modified ceramics, 330 copies;

[0087]Fine aggregate, 700 copies;

[0088]Modified rubber particles, 40 copies;

[0089]Thickener, 2.1 parts;

[0090]Polycarboxylic acid water reducer, 8.1 parts;

[0091]Polypropylene fiber, 2.5 parts;

[0092]Intensive agent, 4 parts;

[0093]Hydrophone ratio, 0.35;

[0094]In the above formulation, each component parameter index is:

[0095]Preparation of modified ceramics: first soaked in water, then mixed in a mixture of 42.5 ordinary silicate cement and expansion agents and two mass fractions of 1: 0.15 and the mixture of bunch of polypropylene fibers in mass than 1: 0.15. However, ceramics, cement, expansion agent, mesophotometric ratio of 19: 1; wherein the cera...

Example Embodiment

[0110]Example 3

[0111]The present invention provides a large flow-state ring to the leaching of thin-walled crack concrete, according to the weight of the part, including the following raw materials:

[0112]Ordinary silicate cement, 260 parts;

[0113]Fly ash, 50 copies;

[0114]Mine powder, 100 parts;

[0115]Silica ash, 35 copies;

[0116]Raw material, 800 copies;

[0117]Modified ceramics, 350 copies;

[0118]Fine aggregate, 800 copies;

[0119]Modified rubber particles, 50 parts;

[0120]Thickener, 2.7 parts;

[0121]Polycarboxylic acid water decrease, 8.9 parts;

[0122]Polypropylene fiber, 3.1 parts;

[0123]Intensive agent, 5 parts;

[0124]Hydrophone ratio, 0.3;

[0125]In the above formulation, each component parameter index is:

[0126]Modified ceramics were prepared: first soaking in water 48 h, then in a mixture of 42.5 ordinary silicate cement and expansion agents 1: 0.2, a mixture of 0.2% beam-shaped polypropylene fibers in a mass ratio of 42.5. Grain and cement, expansion agent, mesh fiber, three: 1; in which th...

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Abstract

The invention discloses large-flow-state circumferential inverted arch thin-wall anti-crack concrete and a preparation method thereof. The concrete is prepared from the following components in parts by weight: 220 to 260 parts of ordinary Portland cement, 40 to 50 parts of fly ash, 80 to 100 parts of mineral powder, 20 to 35 parts of silica fume, 700 to 800 parts of coarse aggregate, 300 to 350 parts of modified ceramsite, 600 to 800 parts of fine aggregate, 30 to 50 parts of modified rubber particles, 1.5 to 2.7 parts of thickening agent, 7.2 to 8.9 parts of polycarboxylic acid water reducing agent, 1.6 to 3.1 parts of polypropylene fiber and 3 to 5 parts of expanding agent, and the water-binder ratio is 0.3 to 0.4. According to the large-flow-state circumferential inverted arch thin-wall anti-crack concrete, rigidity gradient change of a vertical structure is achieved, the anti-crack performance in a circumferential structure is good, and inverted arch disengaging and cracking under circumferential constraint are avoided.

Description

technical field [0001] The invention belongs to the field of concrete, and in particular relates to a large-fluid annular inverted arch thin-wall crack-resistant concrete and a preparation method thereof. Background technique [0002] In engineering projects with arch structures such as tunnels, cast-in-situ concrete with impermeability is often used for the secondary lining structure. Usually, the thickness of this structural layer is between 20-40cm, and the size is small. Due to the constraints of prefabricated segments Due to the action of the concrete and the settlement of the concrete, problems such as cracking and voiding of the vault often occur in the arched structure. [0003] At present, measures such as adding expansion agent, fiber and low-heat and low-shrinkage concrete mix ratio are commonly used to prevent the above problems in vault concrete, but they still cannot solve the concrete cracking under the condition of circumferential constraints, uneven shrinkag...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/02C04B18/22C04B111/34
CPCC04B28/04C04B18/023C04B18/22C04B2111/343C04B18/08C04B18/141C04B18/146C04B14/02C04B2103/44C04B2103/302C04B16/0633C04B22/066C04B22/064Y02W30/91
Inventor 黄暑年王军赵日煦高飞黄汉洋贺中泽
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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