A non-destructive method and system for measuring and estimating the durability of concrete

A technology of concrete and durability, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as time-consuming and labor-intensive, failure to meet specifications or design, and achieve the effect of accurate data, clear principles, and accurate deduction

Active Publication Date: 2018-06-08
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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  • A non-destructive method and system for measuring and estimating the durability of concrete
  • A non-destructive method and system for measuring and estimating the durability of concrete
  • A non-destructive method and system for measuring and estimating the durability of concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The purpose of this example is to illustrate the development of a non-destructive measurement and estimation system for the durability of concrete.

[0043] 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.

[0044] Each maturity-chloride ion diffusion coefficient characteristic relationship curve is obtained by the following steps:

[0045] According to the determined concrete raw materials and concrete mix ratio, the RCM test specimens of 1# concrete are formed, and there are 6 ages of 3 days, 7 days, 14 days, 21 days, 28 days and 56 days, and 3 tests are made for each age Specimens, a total of 18 concrete RCM test specimens were pr...

Embodiment 2

[0055] This example is a specific example based on the maturity measurement and deduction of concrete durability.

[0056] The non-destructive measurement of the present invention and the method for estimating the durability of concrete comprise the following steps:

[0057] During the construction process, a maturity tester is embedded in the concrete of the solid component to test the maturity value of the concrete;

[0058] 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;

[0059] 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

[0061] Sample: the existing prefabricated immersed tube concrete mix ratio of the Hong Kong-Zhuhai-Macao Bridge (the amount of cementitious material is 420kg / m 3 , cement, fly ash, granulated blast furnace slag powder respectively account for 45%, 25%, 30% of the cementitious material) as the basic mix ratio, and its mix ratio is shown in Table 3 below.

[0062] Table 3 Test concrete reference ratio (unit: kg / m 3 )

[0063]

[0064] 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.

[0065] 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 the concrete maturity and the concrete chloride io...

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PUM

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Abstract

The invention discloses a non-destructive method for measuring and estimating the durability of concrete, which includes the following steps: (1) draw a certain maturity-chloride ion diffusion coefficient characteristic based on a certain concrete raw material and reinforced concrete with a certain mix ratio Relational curve; (2) Embed a maturity tester in the concrete of the solid component to test the maturity value of the concrete; (3) Rely on the maturity-chloride ion diffusion coefficient characteristic relationship curve in step (1), reversely push out the on-site The chloride ion diffusion coefficient of the concrete corresponding to the maturity values ​​in different periods of the test, compare the chloride ion diffusion coefficient with the specification or design requirements to judge whether the chloride ion diffusion coefficient of the concrete under the site conditions at this time meets the specification Or design requirements, so as to infer the durability of concrete. The method of the invention saves time and effort, can accurately estimate the chloride ion diffusion coefficient of the reinforced concrete member, and has no damage to the 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 Patents(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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