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A kind of airtight concrete material and preparation method thereof

A concrete and airtight technology, applied in the field of building construction materials, to achieve the effects of inhibiting the overflow of toxic and harmful gases such as gas, excellent frost resistance, and compact structure

Active Publication Date: 2021-01-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult for traditional ordinary concrete or commonly used high-performance concrete to meet this special requirement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: The volume ratio of coarse aggregate in the described airtight concrete material is 39.1%, the volume ratio of fine aggregate is 29.4%, the volume ratio of cement is 10.8%, and the volume ratio of ground mineral powder is 1.8% %, the volume ratio of fly ash is 2.5%, the volume ratio of water is 14.6%, the volume ratio of water reducer and special air-entraining agent is 1.4% in total, and the volume ratio of voids or pores is 0.4%. .

Embodiment 2

[0023] Embodiment 2: The volume ratio of coarse aggregate in the described airtight concrete material is 37.5%, the volume ratio of fine aggregate is 28.2%, the volume ratio of cement is 12.1%, and the volume ratio of ground mineral powder is 1.9% %, the volume ratio of Class II fly ash is 3.4%, the volume ratio of water is 15.1%, the volume ratio of water reducing agent and special air-entraining agent is 1.5% in total, and the volume ratio of voids or pores is 0.3%.

[0024] The continuous gradation of limestone coarse aggregate in the above-mentioned examples 1 and 2 has a particle size of 5-25 mm; the fineness modulus of the clean middle river sand is 2.6-2.8, and the continuous gradation; the ground fine mineral powder is F grade ; The fly ash is grade II ash, and the main chemical components of mineral powder, fly ash, etc. are CaO, SiO 2 、Al 2 o 3 , Fe 2 o 3 etc.; the cement is ordinary Portland cement (P.O), with a strength grade of about 42.5MPa, 2CaO·SiO 2 and 3...

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PUM

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Abstract

The invention discloses an airtight concrete material, wherein the preparation method comprises: stirring continuous graded limestone coarse aggregate, clean medium river sand, grinded mineral powder,II-grade fly ash, ordinary Portland cement, an efficient water reducing agent, a special air entraining agent and water, carrying out compact molding, and carrying out standard curing, and the airtight concrete material is the main concrete material of tunnel secondary lining structures in environments with overflowing of coal gas and other toxic and harmful gases. According to the invention, theairtight concrete material has the main characteristic of compactness, wherein the elastic gas bubbles exist in the capillary pores in the substructure, so that the gas permeation resistance, the impermeability, the alkali-aggregate reaction resistance, the crack resistance, the frost resistance and the like are excellent; and the raw materials excluding the special air entraining agent are widein the sources, and the preparation process is simple.

Description

technical field [0001] The invention relates to the technical field of building construction materials, in particular to an airtight concrete material and a preparation method thereof. Background technique [0002] Building structures such as railway tunnels, highway tunnels, and urban underground passages are composed of surrounding rock, primary support, waterproof layer, and secondary lining concrete. For the secondary lining concrete, its main function is to provide structural safety reserves and prevent surface water or groundwater from seeping into the inner space of the tunnel. When the temperature is below zero, the seeping water may cause traffic safety hazards due to freezing. Therefore, it is generally required that the tunnel secondary lining concrete has suitable compressive and tensile strength, good deformation capacity, anti-penetration capacity against pressure water penetration, good durability and long-term performance. Guizhou, Chongqing, and Yunnan in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B38/10C04B24/34C04B103/30C04B111/20C04B111/27
CPCC04B28/04C04B40/0039C04B2103/304C04B2111/00275C04B2111/00724C04B2111/20C04B2111/27C04B2111/29C04B2201/20C04B2201/50C04B14/28C04B18/08C04B18/141C04B2103/302C04B14/068C04B38/10C04B24/34C04B24/20C04B24/16C04B24/163
Inventor 华渊连俊英张聪刘文化
Owner JIANGNAN UNIV
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