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Determination method for indoor rapid freeze-thaw cycle and natural freeze-thaw cycle relation of concrete

A freeze-thaw cycle and determination method technology, applied to measuring devices, instruments, scientific instruments, etc., can solve the problem of not considering the impact of concrete freeze-thaw damage

Active Publication Date: 2018-10-26
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for determining the relationship between the rapid freeze-thaw cycle and the natural freeze-thaw cycle in the concrete chamber, which can solve the problem that the existing method does not consider the influence of the freeze-thaw cycle temperature history on the freeze-thaw damage of concrete. The freeze-thaw cycle temperature and cycle time are comprehensively analyzed, and a bridge between indoor rapid freeze-thaw and natural freeze-thaw is built, which can quantitatively guide the indoor rapid freeze-thaw to the natural freeze-thaw degradation of on-site water engineering

Method used

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  • Determination method for indoor rapid freeze-thaw cycle and natural freeze-thaw cycle relation of concrete
  • Determination method for indoor rapid freeze-thaw cycle and natural freeze-thaw cycle relation of concrete
  • Determination method for indoor rapid freeze-thaw cycle and natural freeze-thaw cycle relation of concrete

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Embodiment 1

[0051] A method for determining the relationship between a concrete indoor rapid freeze-thaw cycle and a natural freeze-thaw cycle, the method comprising the following steps:

[0052] Step 1: Select the concrete water project to be investigated, and obtain the design mix ratio and strength grade of the hydraulic concrete of the concrete water project;

[0053] Step 2: Design and carry out N types of freeze-thaw tests, N≥3, and the lowest temperature of different freeze-thaw cycles in combination with the design mix ratio of the hydraulic concrete of the concrete water project to be investigated, and obtain concrete deterioration test data under different freeze-thaw cycles, and study The effect of the minimum temperature of different freeze-thaw cycles on the freeze-thaw damage of concrete;

[0054] Step 3: In analogy to the equivalent age theory of concrete, a formula for calculating the equivalent damage age of concrete considering the temperature history of freeze-thaw cycl...

Embodiment 2

[0085] Case Analysis

[0086] Step 1: Select the concrete water project to be investigated, and obtain the design mix ratio and strength grade of the hydraulic concrete of the concrete water project;

[0087] Taking a large-scale aqueduct project as the object of investigation and analysis, the concrete water project was completed in 1995, and it had been in operation for 18 years until the on-site inspection of the aqueduct body concrete. The concrete strength grade of the aqueduct body is R300, referring to the standard value of the 28-day age compressive strength of R300 concrete in the Code for Design of Hydraulic Reinforced Concrete Structures (SDJ 20-78) is 20.58MPa. Since there is no hydraulic concrete mix ratio for this concrete water project, the concrete mix ratio is determined by the concrete compressive strength grade.

[0088] Step 2: Design and carry out N types of freeze-thaw tests, N≥3, and the lowest temperature of different freeze-thaw cycles in combination wi...

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Abstract

The invention provides a determination method for an indoor rapid freeze-thaw cycle and natural freeze-thaw cycle relation of concrete. The method comprises the following steps: step 1: obtaining a design matching ratio and a strength grade of hydraulic concrete of a concrete water conservancy; step 2: deigning and expanding N types of freeze-thaw tests of different freeze-thaw cycles at the lowest temperature, wherein N is greater than or equal to 3, so as to obtain concrete degradation testing data under different freeze-thaw times; step 3: establishing a concrete freeze-thaw injury model ofa freeze-thaw cycle temperature procedure; step 4: establishing a relation between an indoor rapid freeze-thaw cycle and a natural freeze-thaw cycle of the concrete. According to the determination method for the indoor rapid freeze-thaw cycle and natural freeze-thaw cycle relation of the concrete, provided by the invention, the problem of an existing method that influences, caused by the freeze-thaw cycle temperature procedure, on concrete freeze-thaw injuries can be solved, and natural freeze-thaw degradation of an on-site water conservancy can be quantitatively guided by indoor rapid freezing and thawing.

Description

technical field [0001] The invention relates to the field of hydraulic concrete structure design, in particular to a method for determining the relationship between a rapid freeze-thaw cycle and a natural freeze-thaw cycle in a concrete chamber. Background technique [0002] Hydraulic concrete will gradually deteriorate under the action of complex factors such as freeze-thaw and temperature fatigue. Therefore, in the design of hydraulic concrete structures, concrete frost resistance is an important durability index. At present, the frost resistance of hydraulic concrete is mainly determined based on laboratory rapid freeze-thaw or slow freeze tests. Since the deterioration mechanism of the actual hydraulic concrete structure under natural freeze-thaw is very complicated, and the temperature amplitude and cycle time of indoor rapid freeze-thaw are quite different from those of natural freeze-thaw, therefore, the number of concrete freeze-thaw cycles obtained indoors , cannot...

Claims

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Application Information

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IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 黄耀英袁斌肖磊王嵛丁宇刘钰
Owner CHINA THREE GORGES UNIV
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