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Method and system for lossless measurement and concrete durability inference

A technology of concrete and durability, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of not meeting the specifications or design, time-consuming and labor-intensive, etc., and achieve the effect of clear principle, accurate data, and accurate estimation

Active Publication Date: 2015-08-26
CCCC FOURTH HARBOR ENG INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the solid components of the project, when it is necessary to judge whether the performance of the concrete material used in the concrete component has met the requirements of the specification or design, it is necessary to drill a core sample on the solid component, and then send the core sample to the laboratory for cutting and processing, and then carry out a 3-year process. The test of the chloride ion diffusion coefficient of concrete for more than 1 hour is time-consuming and laborious; moreover, when the result of a sampling test cannot meet the requirements of the specification or design, the re-sampling test of the solid component will be difficult to be performed due to the damage to the structure caused by drilling the core sample. Accepted by engineering construction units
So far, there is no non-destructive test method suitable for the field that can well characterize the chloride ion diffusion coefficient of concrete

Method used

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  • Method and system for lossless measurement and concrete durability inference
  • Method and system for lossless measurement and concrete durability inference
  • Method and system for lossless measurement and concrete durability inference

Examples

Experimental program
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Embodiment 1

[0041] The purpose of this example is to illustrate the development of a non-destructive measurement and estimation system for the durability of concrete.

[0042] The system for non-destructive measurement and estimation of concrete durability of the present invention integrates a plurality of maturity-chloride ion diffusion coefficient characteristic relationship curves, and each maturity-chloride ion diffusion coefficient characteristic relationship curve is based on certain concrete raw materials and matching Ratio of reinforced concrete drawn.

[0043] Each maturity-chloride ion diffusion coefficient characteristic relationship curve is obtained by the following steps:

[0044] Form the RCM test specimens of 1# concrete according to the determined concrete raw materials and concrete mix ratio, and make 3 test specimens for each age according to 6 ages of 3d, 7d, 14d, 21d, 28d and 56d, and make a total of 18 Concrete RCM test specimen;

[0045] Embed a maturity tester in...

Embodiment 2

[0054] This example is a specific example based on the maturity measurement and deduction of concrete durability.

[0055] The non-destructive measurement of the present invention and the method for estimating the durability of concrete comprise the following steps:

[0056] During the construction process, a maturity tester is embedded in the concrete of the solid component to test the maturity value of the concrete;

[0057] From the non-destructive measurement described in the implementation one and the system of inferring the durability of concrete, find out the maturity of the concrete that is roughly the same as the concrete material composition and proportioning ratio of this example-chloride ion diffusion coefficient characteristic relationship curve;

[0058] Relying on the above characteristic relationship curve, the chloride ion diffusion coefficient of the corresponding concrete is obtained according to the maturity value obtained from the field test, and the chlor...

specific example

[0060] Sample: the existing prefabricated immersed tube concrete mix ratio of the Hong Kong-Zhuhai-Macao Bridge (the amount of cementitious material is 420kg / m3, cement, fly ash and granulated blast furnace slag powder account for 45%, 25% and 30% of the cementitious material respectively ) is the basic mix ratio, which is shown in Table 3 below.

[0061] Table 3 Test concrete reference ratio (unit: kg / m3)

[0062]

[0063] The relationship between the curing age and maturity value of the above concrete under natural curing and standard curing conditions is as follows figure 1 As shown, and its maturity-chloride ion diffusion coefficient characteristic relationship curve is as follows figure 2 shown.

[0064] Depend on figure 2 It can be seen that the chloride ion diffusion coefficient of concrete decreases with the increase of concrete maturity, and there is an approximate power function relationship between concrete maturity and concrete chloride ion diffusion coeffi...

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Abstract

The invention discloses a method and system for lossless measurement and concrete durability inference. The method comprises the following steps of 1, drawing a determined maturity-chloride ion diffusion coefficient characteristic relationship curve based on reinforced concrete of which raw materials and a raw material ratio are known, 2, embedding a maturity tester into concrete of an entity component and testing concrete maturity, and 3, according to the maturity-chloride ion diffusion coefficient characteristic relationship curve obtained by the step 1, reversely inferring concrete chloride ion diffusion coefficients corresponding to maturity values in different periods in the on-site test, comparing the chloride ion diffusion coefficients and standard or design requirements to determine if the concrete chloride ion diffusion coefficients under the on-site conditions satisfy the standard or design requirements so that concrete durability inference is realized. The system and method save time and labor, realize accurate inference of a reinforced concrete member chloride ion diffusion coefficient and do not damage a concrete member in the whole process.

Description

technical field [0001] The invention relates to a non-destructive method for estimating the durability of concrete based on maturity, and belongs to the technical field of concrete durability quality control. technical background [0002] In marine corrosive environments, the intrusion of chloride ions is the most important factor leading to premature failure of concrete structures. Concrete structures under the conditions of these environmental factors, the key indicator of the durability of concrete - the concrete chloride ion diffusion coefficient must meet the requirements of the specification or design control indicators, otherwise it is difficult to achieve the predetermined design service life, and it is hoped that in actual engineering construction , The actual construction quality of concrete can also truly implement the requirements of the design indicators, so that the construction quality and life of the infrastructure can be improved. The chloride ion permeabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
Inventor 王胜年吕卫清熊建波黎鹏平岑文杰
Owner CCCC FOURTH HARBOR ENG INST
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