CN111650364A - Method for judging crack age of concrete member - Google Patents
Method for judging crack age of concrete member Download PDFInfo
- Publication number
- CN111650364A CN111650364A CN202010537833.7A CN202010537833A CN111650364A CN 111650364 A CN111650364 A CN 111650364A CN 202010537833 A CN202010537833 A CN 202010537833A CN 111650364 A CN111650364 A CN 111650364A
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- Prior art keywords
- crack
- concrete
- age
- section
- concrete member
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000003763 carbonization Methods 0.000 claims abstract description 39
- 238000005553 drilling Methods 0.000 claims abstract description 3
- 238000000465 moulding Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention provides a method for judging the crack age of a concrete member, which comprises the steps of drilling a core sample at a crack of concrete, and splitting the core sample along the crack; and respectively selecting positions on the surface of the crack section after the core sample is split and the non-crack surface D of the concrete for carrying out a carbonization depth test, comparing the carbonization depths of the crack section and the non-crack surface D of the concrete, and judging the age of the crack by using the age of the concrete member. The problems that the traditional method is difficult to operate practically and low in judgment precision are solved. Belongs to the field of building engineering detection.
Description
Technical Field
The invention provides a method for judging the crack age of a concrete member, and belongs to the field of constructional engineering detection.
Background
The construction engineering detection field often meets the crack problem, generally needs to know the time when the crack approximately appears, and then studies and judges the reason and mechanism of the crack, thereby judging whether the structure is safe.
Judging the occurrence time of the cracks of the concrete member is always a difficult problem in the industry, the traditional judging method is to survey dust in the cracks, and the crack formation time is judged according to the thickness of the deposited dust, so that the method is difficult to actually operate, and particularly for the cracks with the width less than 1 mm; in addition, because the influence of the environment (dust) where the crack is located is large, the judgment precision is often not high, and an intuitive, simple and easy-to-operate method is urgently needed to be found.
Disclosure of Invention
The invention aims to: the method for judging the crack age of the concrete member is provided, and the problems that the actual operation is difficult and the judgment precision is low in the traditional method are solved.
In order to solve the above problems, the method for determining the crack age of the concrete member is specifically as follows: drilling a core sample at the crack of the concrete, and splitting the core sample along the crack; and respectively selecting positions on the surface of the crack section after the core sample is split and the non-crack surface D of the concrete for carrying out a carbonization depth test, comparing the carbonization depths of the crack section and the non-crack surface D of the concrete, and judging the age of the crack by using the age of the concrete member.
If the selected carbonization depth of the crack section is the same as the carbonization depth of the non-crack surface, the crack appears when the concrete member is formed, and the age of the crack can be judged according to the forming time of the concrete member;
the carbonization depth of the crack section is obviously smaller than that of the non-crack surface, so that the crack can be judged to appear later than that of the concrete member during molding, the concrete carbonization depth of the crack section is compared with that of the non-crack surface, the crack age can be judged according to the molding time of the concrete member, and the carbonization depth is in direct proportion to the square root of the concrete age.
A, B, C three positions are sequentially selected from the direction from the crack end to the other end of the crack section surface of the concrete after the core sample is split for a carbonization depth test, if the carbonization depth of the crack section A, B, C is gradually reduced after the crack is split, the crack is unstable and gradually develops, and the time of crack occurrence and the time of crack ending or crack development to the current time can be judged by comparing the carbonization depth of the crack section A, C with the carbonization depth of the non-crack surface D.
The principle is as follows: CO in air2(II)Carbon oxide) gas permeates into concrete and reacts with alkaline substances to generate carbonate and water, so that the alkalinity of the concrete is reduced (carbonization) and the chemical reaction is carried out
Is Ca (OH)2+CO2＝CaCO3+H2O; the concrete is neutral after carbonization and does not change color when acted with phenolphthalein indicator. After the concrete member cracks, CO in the air2The (carbon dioxide) must be filled in the crack to generate carbonization reaction, and the occurrence time of the crack, namely the age of the crack, can be known according to the comparison between the reaction degree (depth) and the carbonization degree (depth) of the surface of a normal component.
Compared with the prior art, the method for judging the age of the crack by using the concrete carbonization degree (depth) in the crack is compared with the carbonization degree (depth) of the normal surface of the concrete, and the age of the crack is judged by using the age of the existing concrete member, so that the problems that the traditional judging method is difficult to operate and has large error are thoroughly solved.
Drawings
FIG. 1 is a schematic structural view of a concrete member;
FIG. 2 is a schematic view of the structure of a core sample;
FIG. 3 is a schematic view of a core sample sampling position.
Detailed Description
In order that the present invention may be more clearly and clearly described, reference will now be made in detail to the present invention as illustrated in the accompanying drawings.
Examples
Referring to fig. 1 to 3, wherein reference numeral 3 denotes a crack stop line, and 4 denotes a crack-free section, the present embodiment provides a method for determining the crack age of a concrete member, in which a core sample is drilled at a crack 1 of the concrete, and a core sample 2 is split along the crack 1; and respectively selecting positions on the surface of the crack section after the core sample 2 is split and the non-crack surface D of the concrete for carrying out a carbonization depth test, comparing the carbonization depths of the crack section and the non-crack surface D of the concrete, and judging the age of the crack by using the age of the concrete member.
If the selected carbonization depth of the crack section is the same as the carbonization depth of the non-crack surface, the crack 1 appears when the concrete member is formed, and the age of the crack can be judged according to the forming time of the concrete member;
the carbonization depth of the crack section is obviously smaller than that of the non-crack surface, so that the crack can be judged to appear later than that of the concrete member during molding, the carbonization depth of the concrete of the crack section is compared with that of the non-crack surface, and the crack age can be judged according to the molding time of the concrete member.
A, B, C three positions are sequentially selected from the direction from the crack end to the other end of the crack section surface of the concrete after the core sample 2 is split for carrying out a carbonization depth test, if the carbonization depth of the crack section A, B, C is gradually reduced after the crack 1 is split, the crack is unstable and gradually develops after appearing, and the appearance time and the finish time or the development time to the current time of the crack can be judged by comparing the carbonization depth of the crack section A, C with the carbonization depth of the non-crack surface D.
Claims (2)
1. A method for judging the crack age of a concrete member is characterized by comprising the following steps: drilling a core sample at the crack (1) of the concrete, and splitting the core sample (2) along the crack (1); and respectively selecting positions on the surface of the fractured section after the core sample (2) is split and the non-fractured surface D of the concrete for carrying out a carbonization depth test, comparing the carbonization depths of the fractured section and the non-fractured surface D of the concrete, and judging the age of the fracture by using the age of the concrete member.
If the selected carbonization depth of the crack section is the same as the carbonization depth of the non-crack surface, the crack (1) appears when the concrete member is formed, and the age of the crack can be judged according to the forming time of the concrete member;
the carbonization depth of the crack section is obviously smaller than that of the non-crack surface, so that the crack can be judged to appear later than that of the concrete member during molding, the carbonization depth of the concrete of the crack section is compared with that of the non-crack surface, and the crack age can be judged according to the molding time of the concrete member.
2. The method for determining the crack age of a concrete member according to claim 1, wherein: a, B, C three positions are sequentially selected from the direction from the crack end to the other end of the crack section surface of the concrete after the core sample (2) is split for a carbonization depth test, if the carbonization depth of the crack section A, B, C is gradually reduced after the crack (1) is split, the crack is unstable and gradually develops, and the time for the crack to appear and end or the time for the crack to develop to the current time can be judged by comparing the carbonization depth of the crack section A, C with the carbonization depth of the non-crack surface D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010537833.7A CN111650364A (en) | 2020-06-12 | 2020-06-12 | Method for judging crack age of concrete member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010537833.7A CN111650364A (en) | 2020-06-12 | 2020-06-12 | Method for judging crack age of concrete member |
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| Publication Number | Publication Date |
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| CN111650364A true CN111650364A (en) | 2020-09-11 |
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| CN202010537833.7A Pending CN111650364A (en) | 2020-06-12 | 2020-06-12 | Method for judging crack age of concrete member |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080195330A1 (en) * | 2004-11-02 | 2008-08-14 | Tooru Hara | Concrete Structure Crack Inspection Device and Crack Inspection Method |
| CN101377464A (en) * | 2008-09-19 | 2009-03-04 | 孙炳全 | Method for non-destroyed real time continuously testing concrete carbonization depth |
| CN103713023A (en) * | 2013-12-17 | 2014-04-09 | 深圳大学 | Method for testing carbonation depth of cement-base material |
| WO2014137035A1 (en) * | 2013-03-05 | 2014-09-12 | 한국건설기술연구원 | Method for semi-quantitatively evaluating concrete carbonation and apparatus therefor |
| CN110362856A (en) * | 2019-05-31 | 2019-10-22 | 南京航空航天大学 | Regenerated coarse aggregate concrete carbonization depth calculation method under load |
-
2020
- 2020-06-12 CN CN202010537833.7A patent/CN111650364A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080195330A1 (en) * | 2004-11-02 | 2008-08-14 | Tooru Hara | Concrete Structure Crack Inspection Device and Crack Inspection Method |
| CN101377464A (en) * | 2008-09-19 | 2009-03-04 | 孙炳全 | Method for non-destroyed real time continuously testing concrete carbonization depth |
| WO2014137035A1 (en) * | 2013-03-05 | 2014-09-12 | 한국건설기술연구원 | Method for semi-quantitatively evaluating concrete carbonation and apparatus therefor |
| US20150168369A1 (en) * | 2013-03-05 | 2015-06-18 | Korea Institute Of Construction Technology | Method for evaluating semi-quantitatively of concrete carbonization and evaluating apparatus using the same |
| CN103713023A (en) * | 2013-12-17 | 2014-04-09 | 深圳大学 | Method for testing carbonation depth of cement-base material |
| CN110362856A (en) * | 2019-05-31 | 2019-10-22 | 南京航空航天大学 | Regenerated coarse aggregate concrete carbonization depth calculation method under load |
Non-Patent Citations (1)
| Title |
|---|
| 黄海新 等: "带裂缝混凝土碳化深度预测模型", 《混凝土》 * |
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Application publication date: 20200911 |