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Slice sampling method used for determining recycled concrete carbonization zone microstructure

A technology of recycled concrete and carbonized area, which is applied in sampling, sampling device, preparation of test samples, etc., can solve the problem of differentiating sampling of old and new mortar, and achieve the effect of ensuring representativeness

Inactive Publication Date: 2018-11-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: Aiming at the problem that traditional methods are difficult to distinguish between new and old mortars with different carbonation depths in recycled concrete, the present invention provides a method for slice sampling for measuring the microstructure of carbonized areas of recycled concrete, which can effectively obtain regeneration New and old hardened cement slurry samples of concrete in different carbonation depth intervals to ensure the representativeness of sampling and the accuracy of test results

Method used

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  • Slice sampling method used for determining recycled concrete carbonization zone microstructure
  • Slice sampling method used for determining recycled concrete carbonization zone microstructure
  • Slice sampling method used for determining recycled concrete carbonization zone microstructure

Examples

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Embodiment 1

[0036] A slice sampling method for determining the phase composition of the carbonation zone of recycled concrete, comprising the following steps:

[0037] (1) Forming C30 recycled concrete specimens, wherein the recycled aggregate is obtained by crushing C20 primary concrete (mixed with 0.5% iron oxide red) prepared in the laboratory, and the replacement rate of recycled aggregate is 100%. ℃, relative humidity 70%, CO 2 Carbonization for 28 days in an environment with a concentration of 20%;

[0038] (2) slice: such as figure 1 , along the one-dimensional carbonization direction, from the intersection point of the front carbonization surface and the upper non-carbonization surface to the center of the concrete at an interval of 5mm vertical slices;

[0039](3) Sampling: The sampling locations are 0-5mm, 5-10mm, 10-15mm, 15-20mm, 20-25mm, 25-30mm, 30-35mm. Knock out the new mortar particles in this area with a small hammer, and after further crushing, put them into a mortar...

Embodiment 2

[0041] A slice sampling method for determining the phase composition of the carbonation zone of recycled concrete, comprising the following steps:

[0042] (1) Forming C30 recycled concrete specimens, wherein the recycled aggregate is obtained by crushing C20 primary concrete (mixed with 0.5% iron oxide red) prepared in the laboratory, and the replacement rate of recycled aggregate is 100%. ℃, relative humidity 70%, CO 2 Carbonization for 28 days in an environment with a concentration of 20%;

[0043] (2) slice: such as figure 1 , along the one-dimensional carbonization direction, from the intersection point of the front carbonization surface and the upper non-carbonization surface to the center of the concrete at an interval of 5mm vertical slices;

[0044] (3) Sampling: The sampling locations are 0-5mm, 5-10mm, 10-15mm, 15-20mm, 20-25mm, 25-30mm, 30-35mm. Knock out the old mortar particles in this area with a small hammer, and after further crushing, put them into a morta...

Embodiment 3

[0046] A slice sampling method for determining the phase composition of the carbonation zone of recycled concrete, comprising the following steps:

[0047] (1) Forming C30 recycled concrete specimens, wherein the recycled aggregate is obtained by crushing C20 primary concrete (mixed with 0.5% iron oxide red) prepared in the laboratory, and the replacement rate of recycled aggregate is 70%. ℃, relative humidity 70%, CO 2 Carbonization for 28 days in an environment with a concentration of 20%;

[0048] (2) slice: such as figure 1 , along the one-dimensional carbonization direction, from the intersection point of the front carbonization surface and the upper non-carbonization surface to the center of the concrete at an interval of 5mm vertical slices;

[0049] (3) Sampling: The sampling locations are 0-5mm, 5-10mm, 10-15mm, 15-20mm, 20-25mm, 25-30mm, 30-35mm. Knock out the new mortar particles in this area with a small hammer, and after further crushing, put them into a mortar...

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Abstract

The invention discloses a slice sampling method used for determining a recycled concrete carbonization zone microstructure. The method includes the following steps: (1) molding a recycled concrete test piece, and performing one-dimensional carbonization after demolding and maintenance; (2) performing vertically slicing from an intersection point of a front carbonized surface and an upper non-carbonized surface to the center of the test piece at intervals along the one-dimensional carbonization direction of the test piece so that test piece slices with different carbonization depth can be obtained; and (3) performing sampling, knocking out new and old mortar particles in each test piece slice, and performing carbonized zone microscopic test after performing further crushing and vacuum drying. The method can control slice intervals according to actual carbonization depth, so that new and old hardened cement slurry samples of recycled concrete in different carbonization depth sections canbe obtained; and the method can separately analyze the carbonization depth, the division of carbonization areas and microstructure of the new and old mortar in the recycled concrete, and therefore, reference can be provided for accurate carbonation life prediction of the recycled concrete and other sampling methods for durability studies.

Description

technical field [0001] The invention relates to a sampling method, in particular to a slice sampling method for measuring the microstructure of the carbonation zone of recycled concrete, and belongs to the field of building material detection. Background technique [0002] Similar to ordinary concrete, the carbonation of recycled concrete (RAC) is a series of complex physical and chemical reactions. During the carbonization process, corresponding to different carbonization depths, the microstructure of RAC, that is, the phase composition, pore structure and interface properties of the matrix will change. Exploring the change law of the microstructure of recycled concrete in different carbonized areas is of great significance for judging the size of partially carbonized areas and predicting the life of recycled concrete. [0003] However, recycled aggregate (RCA) usually has a layer of old mortar attached to it, and its performance is quite different from that of new mortar ...

Claims

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Application Information

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IPC IPC(8): G01N1/06G01N1/28G01N33/38
CPCG01N1/06G01N1/286G01N33/383G01N2001/2866
Inventor 潘钢华匡桐糜人杰
Owner SOUTHEAST UNIV
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