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Method for maintaining high-performance concrete under severe environment

A high-performance concrete and harsh environment technology, applied in the field of concrete, can solve problems such as hard maintenance methods to be effective, and achieve good thermal insulation, good effect, and no pollution to the environment

Inactive Publication Date: 2011-04-27
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In special environments, such as the harsh climate along the Lanzhou-Xinjiang Second Line, conventional maintenance methods are difficult to be effective

Method used

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  • Method for maintaining high-performance concrete under severe environment
  • Method for maintaining high-performance concrete under severe environment
  • Method for maintaining high-performance concrete under severe environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The maintenance materials used in the heat preservation and moisturizing maintenance method are: rubber-plastic board + geotextile.

[0027] Procedures and precautions of heat preservation, moisturizing and maintenance methods:

[0028] 1. After the concrete is poured, immediately cover the top surface of the concrete and the surface of the concrete exposed to the air with a rubber-plastic plate or geotextile or reserve 5cm on the top of the formwork, and water it for curing to prevent exposure to the atmosphere The moisture on the concrete surface evaporates too fast and shrinkage cracks appear;

[0029] 2. When the strength of the poured concrete meets the requirements of form removal and the temperature of the concrete center begins to drop, the form removal can be carried out; the time of form removal should not be too early or too late, and the premature removal of the form will lead to the failure of the concrete strength and elastic modulus If the design require...

Embodiment 2

[0042] This embodiment provides a comparative test of curing using the curing method of the present invention.

[0043](1) Purpose: The L (beam) type, D (pier) type and Z (pile) type concrete mixed with anti-cracking compacting agent were prepared, and the strength and chloride ion penetration resistance test specimens were made, and tested under standard conditions. For curing, the strength value of 7d, 28d and 56d and the electric flux of 28d and 56d were tested respectively; the test results were compared with the optimized concrete without concrete anti-cracking and densifying agent, and the effect of anti-cracking and densifying agent on concrete was analyzed. Strength, compactness and crack resistance.

[0044] (2) Scheme: Curing the specimen under standard conditions for 1 day. After demoulding, wrap the plastic film for curing (denoted as CT) and wrap the heat-preserving and moisturizing film (denoted as WS) for curing. ~15℃ and -10~20℃ three kinds of curing temperatu...

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Abstract

The invention discloses a method for maintaining high-performance concrete under a severe environment, comprising the following steps of: after concrete pouring is completed, immediately covering a rubber and plastic plate or a geotextile or reserving a space on the top end of a template after the top surface of the concrete or the surface of concrete exposed to the air is closed, and watering in the space for maintenance; when the strength of the poured concrete achieves the requirements for mould removal and the central temperature of the concrete starts to be reduced, carrying out the mould removal; packing heat-preserving and moisture-preserving materials for the maintenance during the mould removal; and maintaining in the way of double packing with a heat-preserving and moisture-preserving material in the maintaining process.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a maintenance method for high-performance concrete in harsh environments. Background technique [0002] During the construction of mass concrete, due to the heat of cement hydration, the temperature difference inside the concrete pouring body changes drastically, which causes the early plastic shrinkage of the concrete pouring body and the shrinkage during the hardening process of the concrete, which is the drastic change of the temperature-shrinkage stress inside the concrete pouring body , which leads to the appearance of cracks in concrete pouring bodies or components. Practice has shown that most of the common cracks in concrete are surface cracks of different depths. In the early stage, due to the high temperature rise in the concrete due to the heat of cement hydration, the surface temperature is low after the formwork is removed, and the temperature difference between the...

Claims

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Application Information

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IPC IPC(8): B28B11/24
Inventor 王起才张戎令拉有玉刘树红杨斌张粉芹于本田周立霞
Owner LANZHOU JIAOTONG UNIV
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