CN113916177B - Concrete dam carbonization depth full life cycle nondestructive testing method - Google Patents
Concrete dam carbonization depth full life cycle nondestructive testing method Download PDFInfo
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- CN113916177B CN113916177B CN202111150879.4A CN202111150879A CN113916177B CN 113916177 B CN113916177 B CN 113916177B CN 202111150879 A CN202111150879 A CN 202111150879A CN 113916177 B CN113916177 B CN 113916177B
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- 238000003763 carbonization Methods 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 94
- 238000007906 compression Methods 0.000 claims abstract description 6
- 230000006835 compression Effects 0.000 claims abstract description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- 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 claims description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 8
- 239000001569 carbon dioxide Substances 0.000 claims description 8
- 238000010586 diagram Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000012188 paraffin wax Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract description 12
- 208000027418 Wounds and injury Diseases 0.000 abstract description 3
- 208000014674 injury Diseases 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005553 drilling Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/18—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring depth
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
Abstract
The invention discloses a concrete dam carbonization depth full life cycle nondestructive testing method, which comprises the following steps: step 1, preparing a concrete test piece which has the same proportion as the components of a concrete dam to be tested, and establishing a carbonization depth-compressive strength relation curve; step 2, arranging an embedded wireless concrete temperature sensor in the concrete dam to be tested, and detecting the temperature of the concrete; step 3, calculating the maturity and the compressive strength according to the concrete temperature detected in the step 2; and 4, finding out the corresponding carbonization depth on the carbonization depth-compression strength relation curve established in the step 1 according to the compression strength obtained in the step 3, and obtaining the carbonization depth of the concrete dam to be tested. The method solves the problems of large-volume concrete damage and injury caused in the existing concrete dam carbonization depth measuring process and poor measuring result accuracy.
Description
Technical Field
The invention belongs to the technical field of mass concrete detection, and relates to a full life cycle nondestructive detection method for carbonization depth of a concrete dam.
Background
Concrete carbonization mainly affects the rust condition of the steel bars in the concrete. If the carbonization depth of the concrete is too large, the corrosion of the steel bars in the concrete can be accelerated, so that the tensile stress of the structure borne by the steel bars in the mass concrete directly acts on the concrete, and the structure can be damaged in an accelerating way.
The large-volume concrete is mainly applied to high-rise building foundations, large-scale equipment foundations, water conservancy dams, tunnel foundations and the like. The steel bar corrosion caused by concrete carbonization damages the engineering or reduces the service life, so that the engineering has to be reinforced or maintained, and great direct and indirect economic losses are caused.
The measurement of the carbonization depth is beneficial to knowing the durability of mass concrete in advance and clearly knowing the corrosion degree of the steel bar, thereby preventing the corrosion of the steel bar in advance and reducing unnecessary manpower and economic loss.
The currently widely accepted method for measuring the carbonization depth of mass concrete is as follows: (1) Forming a hole with a diameter on the surface of the concrete area by adopting a proper tool, wherein the depth of the hole is larger than the carbonization depth of the concrete; (2) Removing powder and scraps in the holes, and cleaning with water; (3) Dropping 1% phenolphthalein alcohol solution on the surface of the chiseled concrete; (4) When the boundary between carbonized and non-carbonized was clear, the depth of concrete without discoloration was measured with a carbonized depth measuring scale.
The existing method for measuring the carbonization depth still has obvious problems and disadvantages:
(1) The determination is mainly to form a hole with a depth larger than the carbonization depth of concrete on the surface of a concrete area, and the structural damage and damage can be caused to a large-volume concrete facility; (2) Under the condition that the primary carbonization depth is measured and the measurement purpose is not achieved, a plurality of damages and injuries can be caused to the dam body, and the seepage stability of the dam is further affected; (3) Only partial intermittent carbonization conditions can be obtained, and specific carbonization conditions of facilities cannot be well detected; (4) Not only can damage facilities, but also wastes time, and potential safety hazards are easily brought to measuring staff in some areas which are not easy to measure; (5) The concrete carbonization depth measuring ruler is a carbonization depth measuring instrument and a vernier caliper, the maximum measuring range of the carbonization depth measuring instrument is only 8mm, the use requirement cannot be met under many conditions, the measuring range of the vernier caliper is large, although the use requirement can be met, errors are easy to generate during measurement, the measurement result is inaccurate, and the carrying is inconvenient.
Disclosure of Invention
The invention aims to provide a full life cycle nondestructive testing method for the carbonization depth of a concrete dam, which solves the problems of large-volume concrete damage and injury caused in the existing carbonization depth measuring process of the concrete dam and poor accuracy of measuring results.
The technical scheme adopted by the invention is that the full life cycle nondestructive testing method for the carbonization depth of the concrete dam is implemented according to the following steps:
step 1, preparing a concrete test piece which has the same proportion as the components of a concrete dam to be tested, and establishing a carbonization depth-compressive strength relation curve;
step 2, arranging an embedded wireless concrete temperature sensor in the concrete dam to be tested, and detecting the temperature of the concrete;
step 3, calculating the maturity and the compressive strength according to the concrete temperature detected in the step 2;
and 4, finding out the corresponding carbonization depth on the carbonization depth-compression strength relation curve established in the step 1 according to the compression strength obtained in the step 3, and obtaining the carbonization depth of the concrete dam to be tested.
The present invention is also characterized in that,
the step 1 is specifically implemented according to the following steps:
step 1.1, preparing a plurality of cuboid concrete test pieces 1 by adopting raw materials which are the same as components of a concrete dam to be tested and have the same proportion;
step 1.2, placing the concrete test piece prepared in the step 1.1 in a standard curing box for removing carbon dioxide for curing for 28 days;
and step 1.3, performing a carbonization test on the concrete test piece 1 cured in the step 1.2, and measuring carbonization depth and compressive strength to obtain a carbonization depth-compressive strength relation curve.
In step 1.1, the specification of the concrete test piece 1 is determined by the maximum particle size of aggregate in the concrete component, and specifically comprises the following steps:
step 1.3 is specifically implemented according to the following steps:
step 1.3.1, reserving one surface containing long edges of the concrete test piece cured in the step 1.2, and coating 5mm paraffin on the other 5 surfaces for sealing;
step 1.3.2, placing the concrete test piece 1 treated in the step 1.3.1 into a carbonization box for carbonization for 3 days, 7 days, 14 days, 28 days, 54 days, 90 days, 180 days, 270 days, 365 days and 545 days, wherein the intervals among the surfaces left by a plurality of concrete test pieces 1 are not less than 50mm;
step 1.3.3, taking out the concrete test pieces carbonized in the step 1.3.2, cutting each concrete test piece into a plurality of same cube test pieces, cleaning powder on the cross section of each cube test piece, spraying 1% phenolphthalein ethanol solution on the cross section, standing for 30 seconds, measuring carbonization depth of the side surface of each cube test piece, measuring the carbonization depth to be accurate to 1mm, and taking the average value of the carbonization depths of the cube test pieces as the carbonization depth of the corresponding concrete test piece;
step 1.3.4, measuring compressive strength of a plurality of cube test pieces with the carbonization depth measured in step 1.3.3, and taking the average value of the compressive strength of the plurality of cube test pieces as the compressive strength of the corresponding concrete test pieces;
and 1.3.5, forming a scatter diagram by taking the compressive strength of the concrete test piece 1 as an abscissa and the carbonization depth as an ordinate, and fitting each scatter diagram into a curve to obtain a carbonization depth-compressive strength relation curve.
In the step 1.3.2, the concentration of carbon dioxide in the carbonization tank is 20% +/-3%, the humidity is 70% +/-5% and the temperature is 20 ℃ +/-5 ℃ in the carbonization process.
In the step 1.3.3, when coarse aggregate particles are embedded on the boundary line of the carbonization depth measuring point on the side surface of the cube test piece, taking the average value of the carbonization depths at the two sides of the coarse aggregate as the carbonization depth value of the measuring point.
The specific process of the step 2 is as follows: when the concrete dam to be tested is built, a plurality of rows of temperature sensors are distributed in the dam body concrete, the temperature sensors are perpendicular to the dam surface and are respectively arranged at positions 50mm, 100mm, 150mm and 200mm away from the dam surface, each row of temperature sensors is provided with 5 temperature sensors with the interval of 100mm, and the arrangement direction of the 5 temperature sensors in each row is a straight line and parallel to the dam surface.
In step 3, the expression of maturity is:
in the formula (1), M is maturity, and the unit is h; θ is the temperature of the concrete in dt time, in degrees celsius; θ 0 Is a constant, typically-10, in units of deg.c; dt is time and the unit is h.
In step 3, the expression of compressive strength is:
S 2 ＝S 1 +b(log M 2 -log M 1 ) (2)
in the formula (2), S 1 For maturity M 1 A lower compressive strength value; s is S 2 For maturity M 2 A lower compressive strength value; b is the slope of the relationship of the formula.
The invention has the advantages that,
(1) According to the full life cycle nondestructive testing method for the carbonization depth of the concrete dam, the compressive strength of the interior of the concrete is effectively judged through the temperature, so that the damage to the surface structure of the concrete can be prevented, the carbonization depth of the concrete can be rapidly obtained, the purpose of nondestructive testing can be achieved, and the damage to the seepage stability of the mass concrete is avoided;
(2) The full life cycle nondestructive testing method of the carbonization depth of the concrete dam is suitable for measuring the carbonization depth of the large-volume concrete in each stage, and can accurately obtain the full life cycle concrete carbonization depth;
(3) The concrete dam carbonization depth full life cycle nondestructive testing method is low in measuring cost, easy to operate, accurate and reliable.
Drawings
FIG. 1 is a schematic illustration of a concrete test piece in a concrete dam carbonization depth full life cycle nondestructive testing method of the present invention;
FIG. 2 is a schematic diagram of several cube test pieces 2 in a concrete dam carbonization depth full life cycle nondestructive testing method of the present invention;
FIG. 3 is a schematic diagram of temperature sensor layout in a concrete dam carbonization depth full life cycle nondestructive testing method of the present invention;
FIG. 4 is a graph of depth of carbonization versus compressive strength for a concrete dam according to an embodiment of the present invention.
In the figure, 1 a concrete test piece, 2 a cube test piece, 3 a dam concrete and 4 a temperature sensor.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention provides a concrete dam carbonization depth full life cycle nondestructive testing method, which is implemented according to the following steps:
step 1, preparing a concrete test piece 1 (shown in figure 1) with the same proportion as the components of a concrete dam to be tested, and establishing a carbonization depth-compressive strength relation curve;
step 1.1, preparing a plurality of cuboid concrete test pieces 1 by adopting raw materials with the same components and proportions as those of a concrete dam to be tested;
the specification of the concrete test piece 1 is determined by the maximum particle size of aggregate in the concrete component, and is specifically shown in the following table:
TABLE 1 maximum aggregate size and test pattern specification comparison Table
Step 1.2, placing the concrete test piece 1 prepared in the step 1.1 in a standard curing box for removing carbon dioxide for curing for 28 days;
step 1.3, respectively performing carbonization tests on the concrete test piece 1 cured in the step 1.2 for 3 days, 7 days, 14 days, 28 days, 54 days, 90 days, 180 days, 270 days, 365 days and 545 days, and measuring carbonization depth and compressive strength to obtain a carbonization depth-compressive strength relation curve;
the specific process is as follows:
step 1.3.1, reserving one surface containing long edges of the concrete test piece 1 cured in the step 1.2, and coating 5mm paraffin on the other 5 surfaces for sealing;
step 1.3.2, placing the concrete test piece 1 treated in the step 1.3.1 into a carbonization box for carbonization for 3 days, 7 days, 14 days, 28 days, 54 days, 90 days, 180 days, 270 days, 365 days and 545 days, wherein the intervals among the surfaces left by a plurality of concrete test pieces 1 are not less than 50mm;
the carbonization box is in a sealed state, a water seal cannot be adopted, the concentration of carbon dioxide in the carbonization box is 20% +/-3%, the humidity is 70% +/-5% and the temperature is 20 ℃ +/-5 ℃ in the carbonization process;
step 1.3.3, taking out the concrete test pieces 1 carbonized in the step 1.3.2, cutting each concrete test piece 1 into a plurality of identical cube test pieces 2 as shown in fig. 2, cleaning powder on the cross section of the cube test pieces 2, spraying 1% phenolphthalein ethanol solution (1 g phenolphthalein is dissolved in 100ml absolute ethanol) on the cross section, measuring carbonization depth (non-color-changing depth) of each point on the side surface of the cube test pieces 2 after 30s, and taking an average value of carbonization depth at two sides of the coarse aggregate as a depth value of the measuring point if coarse aggregate particles are embedded on a boundary line at the measuring point; the measured value of the carbonization depth is accurate to 1mm, and the average value of the carbonization depths of a plurality of cube test pieces 2 is used as the carbonization depth of the corresponding concrete test piece 1;
step 1.3.4, measuring compressive strength of the plurality of cube test pieces 2 with the carbonization depth measured in the step 1.3.3 by using a pressure testing machine, and taking the average value of the compressive strength of the plurality of cube test pieces 2 as the compressive strength of the corresponding concrete test piece 1;
step 1.3.5, taking the compressive strength of the concrete test piece 1 as an abscissa and the carbonization depth as an ordinate to form a scatter diagram, and fitting each scatter diagram into a curve to obtain a carbonization depth-compressive strength relation curve;
step 2, arranging an embedded wireless concrete temperature sensor 4 in the interior of the concrete dam to be detected, and detecting the temperature of the concrete;
the temperature sensor 4 adopts a platinum resistance temperature sensor of the Lake Shore PT-100 series in the United states;
as shown in fig. 3, when constructing a concrete dam to be tested, arranging a plurality of rows of temperature sensors 4 in the concrete 3 of the dam body, wherein the rows of temperature sensors 4 are perpendicular to the dam surface and are respectively arranged at positions 50mm, 100mm, 150mm and 200mm away from the dam surface, each row of temperature sensors 4 is provided with 5 temperature sensors 4 with an interval of 100mm, and the arrangement direction of the 5 temperature sensors 4 in each row is a straight line and parallel to the dam surface;
step 3, calculating the maturity and the compressive strength according to the concrete temperature detected in the step 2;
the expression of maturity is:
in the formula (1), M is maturity, and the unit is h; θ is the temperature of the concrete in dt time, in degrees celsius; θ 0 Is a constant, typically-10, in units of deg.c; dt is time, in h;
the expression of compressive strength is:
S 2 ＝S 1 +b(log M 2 -log M 1 ) (2)
in the formula (2), S 1 For maturity M 1 A lower compressive strength value; s is S 2 For maturity M 2 A lower compressive strength value; b is the slope of the relationship of the formula;
and 4, finding the corresponding carbonization depth on the carbonization depth-compressive strength relation curve established in the step 1 according to the strength obtained in the step 3, and obtaining the carbonization depth of the concrete dam to be tested.
Examples
Step 1.1, preparing 9 No. 1 cuboid concrete test pieces 1 according to the determined concrete dam components and proportions (see Table 2 for details), and determining the specification of each concrete test piece to be 150 multiplied by 900mm according to the maximum particle size of aggregate in the components;
table 2 1# concrete dam component and proportion
Step 1.2, placing 9 concrete test pieces 1 in a standard curing box for removing carbon dioxide for curing for 28 days;
step 1.3, reserving one 150X 900mm surface of the concrete test piece 1 cured in the step 1.2, and coating 5mm paraffin sealing on the other 5 surfaces; placing the sealed concrete test piece 1 into a carbonization box, and respectively performing carbonization tests on the left surface (surface without paraffin) in the adjacent concrete test piece 1 for 3 days, 7 days, 14 days, 28 days, 54 days, 90 days, 180 days, 270 days, 365 days and 545 days (wherein the carbonization tests are performed according to the specification of the national standard "ordinary concrete long-term durability and durability test method Standard" (GB/T50082-2009)) at intervals of not less than 50mm;
the carbonization box is in a sealed state, a water seal cannot be adopted, the concentration of carbon dioxide in the carbonization box is 20% +/-3%, the humidity is 70% +/-5% and the temperature is 20 ℃ +/-5 ℃ in the carbonization process;
cutting the carbonized concrete test piece 1 into 6 cubic test pieces 2 with the length of 150 multiplied by 150mm, cleaning powder on the cross section of the cubic test piece 2, spraying 1% phenolphthalein ethanol solution on the cross section, standing for 30 seconds, measuring carbonization depth (the measured value is accurate to 1 mm) of each point on the side surface of the cubic test piece 2, and taking the average value of the carbonization depths of the 6 cubic test pieces 2 as the carbonization depth of the corresponding concrete test piece 1; if coarse aggregate particles are embedded on the boundary line of the measuring point, taking the average value of carbonization depths at two sides of the coarse aggregate as the depth value of the measuring point;
the compressive strength of the 6 carbonized cube test pieces 2 is measured by a pressure testing machine, and the average value of the compressive strengths of the 6 cube test pieces 2 is used as the compressive strength of the corresponding concrete test piece 1;
the measured carbonization depth and compressive strength of the concrete test piece 1 in carbonization ages of 3 days, 7 days, 14 days, 28 days, 54 days, 90 days, 180 days, 270 days, 365 days and 545 days are fitted with a carbonization depth-compressive strength relation curve, as shown in fig. 4;
step 2, acquiring a temperature value through a pre-buried temperature sensor;
step 3, calculating compressive strength according to the formula (1) and the formula (2), as shown in the table 3;
table 3 compressive strength of concrete
| Measuring point | Measuring point 1 | Measuring point 2 | Measuring point 3 | Measuring point 4 | Measuring point 5 | Measuring point 6 |
| Compressive strength (Mpa) | 32.5 | 32.7 | 33.1 | 33.5 | 33.1 | 32.4 |
Step 4, finding the corresponding carbonization depth on the carbonization depth-compressive strength relation curve to obtain the carbonization depth of the concrete dam, as shown in table 4;
TABLE 4 carbonization depth of concrete dams obtained by the method of the invention
| Measuring point | Measuring point 1 | Measuring point 2 | Measuring point 3 | Measuring point 4 | Measuring point 5 | Measuring point 6 |
| Depth of carbonization (mm) | 3.95 | 4.02 | 4.20 | 5.10 | 4.20 | 3.94 |
To verify the accuracy and reliability of the method, core drilling and sampling were performed on the concrete dam, and the carbonization depth (i.e., actual carbonization depth) of the downstream surface of the concrete dam was actually measured by a phenolphthalein test method, as shown in table 5:
table 5 carbonization depth measured by core drilling sampling
| Measuring point | Measuring point 1 | Measuring point 2 | Measuring point 3 | Measuring point 4 | Measuring point 5 | Measuring point 6 |
| Depth of carbonization (mm) | 4.11 | 3.84 | 3.87 | 4.56 | 4.03 | 3.75 |
According to the comparison of the carbonization depth data in the table 4 and the table 5, most of the measured carbonization depth errors are not more than 10%, and the prediction results are basically reliable. The reason that the error of the individual measuring points is larger is that the actual service concrete dam is influenced by multiple factors of the environment, so that the actual strength index is inconsistent with the laboratory detection. But in the whole, the method can rapidly estimate the carbonization depth of the concrete dam.
Step 1 of the method can carry out the test on the common conditions according to the common actual components and the common proportion conditions of the concrete dam, and measure the carbonization depth and the compressive strength to obtain a carbonization depth-compressive strength relation curve; and selecting a corresponding carbonization depth-compressive strength relation curve according to the components and the proportion of the concrete dam to be tested in the later stage.
The detection method provided by the invention avoids reserving a large number of maintenance test pieces under the same condition on site, can evaluate the carbonization depth of the concrete without detecting the compressive strength of the reserved test pieces by a universal testing machine, saves time and labor, overcomes the defect that the existing concrete resistivity test can only detect the surface state of the concrete, and can test the strength conditions of different depths of the concrete so as to reduce errors.
Claims (3)
1. The nondestructive testing method for the full life cycle of the carbonization depth of the concrete dam is characterized by comprising the following steps of:
step 1, preparing a concrete test piece (1) which has the same proportion as the components of a concrete dam to be tested, and establishing a carbonization depth-compressive strength relation curve;
the step 1 is specifically implemented according to the following steps:
step 1.1, preparing a plurality of cuboid concrete test pieces (1) by adopting raw materials which are the same as components of a concrete dam to be tested and have the same proportion;
in the step 1.1, the specification of the concrete test piece (1) is determined by the maximum particle size of aggregate in the concrete component, and specifically comprises the following steps:
step 1.2, placing the concrete test piece (1) prepared in the step 1.1 in a standard curing box for removing carbon dioxide for curing for 28 days;
step 1.3, performing a carbonization test on the concrete test piece (1) cured in the step 1.2, and measuring carbonization depth and compressive strength to obtain a carbonization depth-compressive strength relation curve;
step 1.3 is specifically implemented according to the following steps:
step 1.3.1, reserving one surface containing long edges of the concrete test piece (1) cured in the step 1.2, and coating 5mm paraffin on the other 5 surfaces for sealing;
step 1.3.2, placing the concrete test piece (1) treated in the step 1.3.1 into a carbonization box for carbonization for 3 days, 7 days, 14 days, 28 days, 54 days, 90 days, 180 days, 270 days, 365 days and 545 days, wherein the intervals among the surfaces reserved by a plurality of concrete test pieces (1) are not less than 50mm;
step 1.3.3, taking out the concrete test pieces (1) carbonized in the step 1.3.2, cutting each concrete test piece (1) into a plurality of identical cube test pieces (2), cleaning powder on the cross section of each cube test piece (2), spraying 1% phenolphthalein ethanol solution on the cross section, standing for 30 seconds, measuring carbonization depth of the side surface of each cube test piece (2), measuring the carbonization depth to be accurate to 1mm, and taking the average value of the carbonization depths of the cube test pieces (2) as the carbonization depth of the corresponding concrete test piece (1);
step 1.3.4, measuring compressive strength of a plurality of cube test pieces (2) with the carbonization depth measured in step 1.3.3, and taking the average value of the compressive strength of the plurality of cube test pieces (2) as the compressive strength of the corresponding concrete test piece (1);
step 1.3.5, taking the compressive strength of the concrete test piece (1) as an abscissa and the carbonization depth as an ordinate to form a scatter diagram, and fitting each scatter diagram into a curve to obtain a carbonization depth-compressive strength relation curve;
step 2, arranging an embedded wireless concrete temperature sensor (4) in the interior of the concrete dam to be detected, and detecting the temperature of the concrete;
step 3, calculating the maturity and the compressive strength according to the concrete temperature detected in the step 2;
in step 3, the expression of maturity is:
in the formula (1), M is maturity, and the unit is h; θ is the temperature of the concrete within dt time,the units are in degrees Celsius; θ 0 Is constant, θ 0 -10, units are °c; dt is time, in h;
in step 3, the expression of compressive strength is:
S 2 ＝S 1 +b(log M 2 -log M 1 ) (2)
in the formula (2), S 1 For maturity M 1 A lower compressive strength value; s is S 2 For maturity M 2 A lower compressive strength value; b is the slope of the relationship of the formula;
and 4, finding out the corresponding carbonization depth on the carbonization depth-compression strength relation curve established in the step 1 according to the compression strength obtained in the step 3, and obtaining the carbonization depth of the concrete dam to be tested.
2. The nondestructive testing method for the full life cycle of the carbonization depth of the concrete dam according to claim 1, wherein in the step 1.3.2, the concentration of carbon dioxide in a carbonization tank is 20% ± 3%, the humidity is 70% ± 5% and the temperature is 20 ℃ ± 5 ℃.
3. The method for non-destructive testing of the full life cycle of the carbonization depth of a concrete dam according to claim 1, wherein in the step 1.3.3, when coarse aggregate particles are embedded on the boundary line of the carbonization depth measuring point on the side surface of the cubic test piece (2), the average value of the carbonization depths at the two sides of the coarse aggregate is taken as the carbonization depth value of the measuring point.
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