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Method for non-destroyed real time continuously testing concrete carbonization depth

A carbonation depth and concrete technology, which is applied in mechanical depth measurement, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem that the limit of reagent discoloration is not easy to determine, and it is not conducive to the establishment of carbonization model. and inspection, limited sampling times, etc., to achieve the effect of facilitating multiple sampling tests, facilitating long-term testing, and simplifying processes and equipment

Inactive Publication Date: 2009-03-04
孙炳全
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  • Application Information

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Problems solved by technology

This test method has the following deficiencies: 1) There are differences in the concrete structure (aperture, porosity, etc.) near different splitting places, so the detection data lacks identity, and the detection data at different times lacks continuity
2) The roughness and unevenness of the cleavage surface make it difficult to determine the color change limit of the reagent 3) The number of sampling is limited, which is not conducive to the establishment and inspection of the carbonization model

Method used

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  • Method for non-destroyed real time continuously testing concrete carbonization depth
  • Method for non-destroyed real time continuously testing concrete carbonization depth
  • Method for non-destroyed real time continuously testing concrete carbonization depth

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Embodiment 1

[0019] Select the following raw materials and mix ratio: 525 ordinary Portland cement; artificial limestone crushed stone, the maximum particle size is 20mm, and the apparent density is 2680kg / m 3 ;Natural river sand, fineness modulus 2.9, apparent density 2610kg / m 3 ; Class II fly ash. The mix ratio is 0.30 water-binder ratio, 30% fly ash, and 385kg / m cement 3 , gravel 1030kg / m 3 , sand 687kg / m 3 , tap water 165kg / m 3 . Manufacture the test block to be tested; the size of the test block is 160×160×55 mm, the test block has a hemispherical concave surface from the upper surface, and the radius of the hemispherical concave surface is 50 mm. After curing the test piece to the age of 28 days, carry out drying treatment, except for a bottom surface, the rest of the surface is sealed with heated paraffin; the test piece is put into the carbonization box, and the CO in the box is 2 The concentration is kept at 20% ± 3%, the relative humidity is 75% ± 5%, and the temperature is...

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Abstract

A non-destructive real-time continuous concrete carbonation depth testing method comprises the following steps: firstly making concrete test block with spherical concave, having drying process after test block curing, sealing all surfaces with the heated paraffin except a bottom surface, placing the test block in a carbonization box, taking the test block out at different days to test the carbonation depth thereof, having groove-catching process upon the segmental paraffin-sealed surface of the test blcok, injecting R alizarin yellow reagent, draining the reagent, after confirming the discolouring interface, selecting the testing points, measuring the chordal distance of each point of the four laterals, calculating the carbonation depth value for each point, taking the mean value as the testing value and drawing the relation curve between the carbonation time and the carbonation depth with the carbonation depths tested at different days to express the development rule of the concrete under the condition. The invention can test the carbonation depth continuously in real time with high precision, which is beneficial for the study of concrete durability.

Description

technical field [0001] The invention belongs to concrete test and analysis technology, and relates to a non-destructive real-time continuous measurement method for concrete carbonation by using an arc-shaped test block. Background technique [0002] Concrete carbonation depth is an important index to evaluate the durability of reinforced concrete structures. The essence of concrete carbonation is CO in the air 2 Constantly passing through the coarse capillary channels in the concrete that are not completely filled with water, the air diffuses to the Ca(OH) dissolved in the pore fluid in the capillary pores filled with water inside the concrete 2 A phenomenon in which a neutralization reaction is carried out to generate carbonate or other substances. As the alkalinity continues to decrease, it will cause the continuous decomposition of hydrated silicate and aluminate, which will cause the disintegration of cement stone. When the carbonation reaches the surface of the steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N33/38G01B5/18
Inventor 孙炳全
Owner 孙炳全
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