CN109030794B - Concrete temperature rise rapid detection method - Google Patents
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- CN109030794B CN109030794B CN201810826374.7A CN201810826374A CN109030794B CN 109030794 B CN109030794 B CN 109030794B CN 201810826374 A CN201810826374 A CN 201810826374A CN 109030794 B CN109030794 B CN 109030794B
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- 239000004567 concrete Substances 0.000 title claims abstract description 100
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 238000009413 insulation Methods 0.000 claims abstract description 52
- 239000012774 insulation material Substances 0.000 claims abstract description 25
- 239000010410 layer Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000004321 preservation Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 239000002356 single layer Substances 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 3
- 238000010030 laminating Methods 0.000 claims abstract description 3
- 239000004795 extruded polystyrene foam Substances 0.000 claims description 34
- 239000000463 material Substances 0.000 claims description 10
- -1 polyethylene Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 230000002209 hydrophobic effect Effects 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 claims 2
- 239000010409 thin film Substances 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 7
- 239000011490 mineral wool Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 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
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Abstract
The invention discloses a concrete temperature rise rapid detection method, which comprises the steps of firstly, selecting one or more heat insulation materials, calculating the thickness of each layer of heat insulation material, and laminating to prepare a single-layer or multi-layer heat insulation plate; secondly, cutting the heat-insulating plates according to a certain size and assembling the heat-insulating plates into a square heat-insulating mould, so that the internal volume size of the heat-insulating mould is 400-500 mm square; finally, pouring concrete in the heat-preservation mould by adopting the same raw material formula, preparation method and mould-entering conditions as the concrete to be tested; and then embedding the temperature sensor in the concrete, covering an upper cover of the heat-insulating mould, recording the internal temperature of the concrete according to a set test time interval, and drawing a temperature rise curve. The method takes the XPS insulation board with the thickness of 100mm as a standard insulation mould, and utilizes a thermal resistance calculation formula to calculate the thickness required by the insulation board adopting other insulation materials, so that the method is not only suitable for single-layer insulation materials, but also suitable for multi-layer insulation materials, and can more reliably, truly, comprehensively and scientifically evaluate the change of the internal temperature of the concrete.
Description
Technical Field
The invention belongs to the technical field of concrete preparation, and particularly relates to a rapid detection method for concrete temperature rise.
Background
In recent years, with the improvement of the requirements on the strength grade and the working performance of a mixture of concrete, the using amount of a cementing material in the concrete is increased, various additives are introduced, so that a cementing system is complicated, and the phenomenon of increasing non-load cracks of a concrete structure in the early and later stages is caused continuously.
The current common detection methods comprise a cement hydration heat method and a concrete adiabatic temperature rise method, the two detection methods have long test period, usually 7-28 days, and have high requirements on the precision and stability of instruments and equipment, but cannot intuitively, quickly and completely reflect the temperature rise process of the concrete on the engineering site. However, the effects of temperature measurement, mix proportion optimization detection and additive use in the concrete solid structure on the engineering site are large in workload and have adverse effects on the safety performance of the concrete structure. Therefore, the method for rapidly detecting the temperature rise of the concrete is developed under the condition of a laboratory, and plays a positive role in designing and optimizing the mix proportion of the concrete, reasonably using the concrete admixture, reducing the internal temperature rise of the concrete, reducing the internal and external temperature difference, reducing the generation of temperature cracks and improving the quality of a concrete building.
In the prior art, most of components with similar functions, such as temperature sensors, are synchronously embedded in concrete when the concrete is poured, for example, patent 2017209276336, "a system for measuring the temperature distribution of concrete in a steel pipe concrete arch bridge pipe", includes a plurality of retaining rings arranged on the inner wall of a steel pipe, and each retaining ring is provided with a temperature sensor for measuring the temperature change when the concrete is solidified and maintained. In order to meet the actual field conditions of concrete solidification and maintenance, the test needs to be completed on the site of a construction site, the test environment is harsh, the operation is complicated, and the technical requirements on testers are high. For example, patent No. 2015204144789, "heat preservation box for concrete temperature rise test", it designs a relatively small heat preservation box for simulating the temperature rise condition of the concrete solidification and curing process in the construction site under the indoor experimental environment, thereby prejudging the temperature rise change process in the concrete in the construction site. Although the structure of the heat preservation box is innovative, the patent does not disclose a corresponding technical method in terms of how to truly simulate the environment of a construction site. For example, patent No. 201410086731.2, "a method for inverting the adiabatic temperature rise of concrete", mainly studies the change rule of the temperature at different positions in the concrete along with time, and how to use a thermal insulation box made of thermal insulation materials with a proper size to achieve the most accurate simulation effect for the concrete with different sizes and shapes, is lacking in research. If the research is lacked, the size and the material type of the selected simulation mould are difficult to be scientifically fitted with the actual situation, so that the result of the simulation test cannot reflect the real internal temperature rise situation when the concrete is solidified and maintained.
Disclosure of Invention
In order to achieve the best fitting effect of the selected heat preservation mold on the actual concrete temperature rise process in the concrete temperature rise simulation test, the invention provides a concrete temperature rise rapid detection method, which is realized by the following technology.
A concrete temperature rise rapid detection method comprises the following steps:
s1, selecting one or more heat insulation materials, calculating the thickness of each layer of heat insulation material, and laminating to prepare a single-layer or multi-layer heat insulation board;
s2, cutting the heat-insulation plates according to a certain size and assembling the heat-insulation plates into a square heat-insulation die, so that the internal volume size of the heat-insulation die is 400-500 mm square;
s3, pouring concrete in the heat-preservation mould by adopting the same raw material formula, preparation method and mould-entering conditions as the concrete to be detected; then embedding a temperature sensor in the concrete, covering an upper cover of the heat-insulating mould, recording the internal temperature of the concrete according to a specific time interval, and drawing a temperature rise curve;
the method for calculating the thickness of each layer of heat insulation material in step S1 is as follows:
(1) calculating the thermal resistance R of a standard XPS insulation boardXPS：
The XPS insulation board is an extruded polystyrene foam plastic board for heat insulation; knowing that when the thickness of the XPS insulation board is 100mm and the size of a concrete cube is 400-500 mm, the temperature rise curve of the central part of the concrete is equivalent to the temperature rise curve of the central part of the concrete cube to be detected, wherein the size of the concrete cube is 1000 mm; using calculation formula of thermal resistance
RXPS＝0/λ0
Calculate RXPS，0Is the thickness of the XPS insulation board, namely 100 mm; lambda [ alpha ]0The thermal conductivity coefficient of the XPS insulation board is a known constant;
(2) calculating the thickness of the single-layer or multi-layer heat preservation plate to be selected:
one-layer heat insulation board: according to the calculation formula of thermal resistance
RXPS＝Sheet/λSheet
Calculate outSheet，Sheet、λSheetThe thickness and the heat conductivity coefficient of the heat insulation material selected for the single-layer heat insulation board respectively;
a plurality of layers of insulation boards: the thickness of each layer of heat insulation material of the multilayer heat insulation board is selected randomly1、2...nAnd the thickness of each layer of heat-insulating material satisfies the equation
RXPS＝R1+R2+…+Rn＝1/λ1+2/λ2+…+n/λn；
Wherein R is1、R2...RnThe thermal resistance value of each layer of thermal insulation material of the multilayer thermal insulation board; lambda [ alpha ]1、λ2...λnIs the heat conductivity coefficient of each layer of heat insulation material of the multilayer heat insulation board.
Preferably, in step S2, a film is further closely attached to the inside of the heat-preserving mold.
More preferably, the material of the film is hydrophobic and water-proof material, and the heat-resistant temperature is not lower than 90 ℃.
Further preferably, the film is any one of polyvinyl chloride, polyethylene, polypropylene and polystyrene.
Preferably, in step S3, concrete is poured into the heat preservation mold, and the pouring time is not more than 30 min.
Preferably, in step S3, the temperature sensor is embedded in a manner that: fixing a temperature sensor at one end of a rod with scales, penetrating the rod through an upper cover of the heat-insulation mould, inserting the temperature sensor into concrete, and fixing the rod on the upper cover of the heat-insulation mould through a buckle.
Preferably, in step S3, the test time interval is not less than 1 time/hour.
Compared with the prior art, the invention has the advantages that:
1. the complete temperature history of the concrete is detected in the whole process, a reliable, real and comprehensive scientific basis is provided for researching and using mass concrete, the change of the internal temperature of the concrete is better evaluated, and data support is provided for the effects of optimizing the mix proportion of the concrete and applying an additive;
2. the extruded polystyrene foam plastic board for heat insulation with the thickness of 100mm is used as a standard heat insulation die, the thickness of the heat insulation material required when other heat insulation materials are selected is calculated, the method is not only suitable for single-layer heat insulation materials, but also suitable for multi-layer heat insulation materials, and the calculation mode of the thickness is scientific and reasonable;
3. the test data is fast, the workload is small, the test can be carried out in a common concrete laboratory, the measurement is started after the concrete is put into a mold, and the collection comprises the whole temperature process of lowering the temperature from mold entering to temperature peak to room temperature. The heat preservation mould for the test can be used repeatedly, the test condition can be attached to the actual condition of the engineering field, a plurality of heat preservation surfaces can be removed according to the actual condition of the engineering to be simulated, the influence of mould removal on the temperature process of the concrete is eliminated, the test can be directly implemented in a laboratory of the engineering application field, and the raw materials for the test and the external temperature condition are kept the same as the field.
Drawings
FIG. 1 is a simulated temperature rise curve for the concrete of example 1;
FIG. 2 is a simulated temperature rise curve for the concrete of example 2;
FIG. 3 is a simulated temperature rise curve for the concrete of example 3;
FIG. 4 is a simulated temperature rise curve for the concrete of example 4;
FIG. 5 is a simulated temperature rise curve of the concrete of comparative example 1.
FIG. 6 is a schematic structural view of the heat-insulating mold used in embodiments 1 to 4.
The reference numbers in fig. 6 are as follows:
1. a single layer insulation board; 2. an upper cover; 3. concrete; 4. a temperature sensor; 5. a stick.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 6, the heat preservation mold selected in the following embodiments selects a single-layer rock wool board as a heat preservation material, the thickness of the single-layer rock wool board is 150mm through a thermal resistance calculation formula, the internal volume of the heat preservation mold is 450mm square, and the specific calculation process of the thickness of the single-layer rock wool board is as follows:
(1) calculating the thermal resistance R of a standard XPS insulation boardXPS：
The XPS insulation board is an extruded polystyrene foam plastic board for heat insulation; knowing that when the thickness of the XPS insulation board is 100mm and the size of the concrete cube is 450mm, the temperature rise curve of the central part of the concrete is equivalent to the temperature rise curve of the central part of the concrete cube to be measured, the size of which is 1000 mm; using calculation formula of thermal resistance
RXPS＝0/λ0
Calculate RXPS，0Is the thickness of the XPS insulating plate, namely 100mm (0.1 m); lambda [ alpha ]0The thermal conductivity coefficient of the XPS insulation board is a known constant, and 0.03W/m.k is taken; thus RXPSCalculated as 3.33 ℃/W (two decimal places retained);
(2) calculate the thickness of the single-deck rock wool slabRock wool
According to the calculation formula of thermal resistance
RXPS＝Rock wool/λRock wool
Known as λRock wool0.045W/m.k was taken, and therefore,rock woolCalculated to be 150 mm.
Example 1
The strength grade of the concrete selected in the embodiment is C50, the concrete mixing ratio is shown in Table 1, the concrete is added in a mode that the concrete is mixed with a cementing material, an additive and coarse and fine aggregates, water and a water reducing agent are added, the mixing time is not less than 150 seconds, the concrete slump is controlled to be 200 +/-20 mm, 2 data lines are embedded at the center of the concrete, and the detection frequency is 2 times/min after the concrete is completely molded. As the template is usually removed in about 24 hours in the construction of the engineering site to form a heat dissipation condition, in order to be close to the site, the heat insulation material at the top of the heat insulation mould for the test is removed when the concrete enters the mould for 24 hours. The temperature rise curves plotted are shown in FIG. 1.
Table 1 example 1 concrete mix proportion
Example 2
The concrete used in this example was substantially the same as that used in example 1, except that commercially available retarder i (phosphate salt) was also added to the raw materials in an amount of 0.07% of the total amount of the cementitious material. The temperature rise curve is plotted as shown in FIG. 2.
Example 3
The concrete used in this example was substantially the same as that used in example 1, except that a commercially available retarder i (glucose) was also added to the raw material in an amount of 0.07% of the total amount of the cementitious material. The temperature rise curve is plotted as shown in FIG. 3.
Example 4
The concrete used in this example is substantially the same as that used in example 1, except that a hydration heat inhibitor (hydroxycarboxylic acid compound, Wuhan Sanyuan Special building materials, Inc.) is added to the raw materials in an amount of 1.00% of the total amount of the cementitious material. The temperature rise curve plotted is shown in figure 4.
Comparative example 1
This comparative example was used to examine the temperature rise curve of actual concrete and compared the difference from example 1. The concrete raw material formula and the temperature rise detection method adopted in the comparative example are basically the same as those in the example 1. The difference lies in that: the mould of the comparative example adopts a machined wooden template, the thickness of the template is 12mm, the periphery of the template is supported and fixed by 40-60 mm flitch, the selection and construction of other wooden templates are carried out according to the regulation of JGJ162 building construction template safety technical Specification, the internal volume of the mould is 1000mm square, namely the side length of a poured concrete cube is 1000 mm. The temperature rise curve plotted is shown in figure 5.
The temperature rise curves of the concrete according to comparative example 1 and comparative example 1, i.e., the temperature change curves of the concrete according to comparative fig. 1 and fig. 5 are substantially the same. Therefore, the temperature change of the actual concrete during pouring and condensation can be effectively simulated by adopting the heat-insulating mould and the temperature rise detection method provided by the invention.
Claims (7)
1. A concrete temperature rise rapid detection method is characterized by comprising the following steps:
s1, selecting one or more heat insulation materials, calculating the thickness of each layer of heat insulation material, and laminating to prepare a single-layer or multi-layer heat insulation board;
s2, cutting the heat-insulation plates according to a certain size and assembling the heat-insulation plates into a square heat-insulation die, so that the internal volume size of the heat-insulation die is 400-500 mm square;
s3, pouring concrete in the heat-preservation mould by adopting the same raw material formula, preparation method and mould-entering conditions as the concrete to be detected; then embedding a temperature sensor in the concrete, covering an upper cover of the heat-insulating mould, recording the internal temperature of the concrete according to a test time interval, and drawing a temperature rise curve;
the method for calculating the thickness of each layer of heat insulation material in step S1 is as follows:
(1) calculating the thermal resistance R of a standard XPS insulation boardXPS：
The XPS insulation board is an extruded polystyrene foam plastic board for heat insulation; knowing that when the thickness of the XPS insulation board is 100mm and the size of a concrete cube is 400-500 mm, the temperature rise curve of the central part of the concrete is equivalent to the temperature rise curve of the central part of the concrete cube to be detected, wherein the size of the concrete cube is 1000 mm; using calculation formula of thermal resistance
RXPS＝0/λ0
Calculate RXPS，0Is the thickness of the XPS insulation board, namely 100 mm; lambda [ alpha ]0The thermal conductivity coefficient of the XPS insulation board is a known constant;
(2) calculating the thickness of the single-layer or multi-layer heat preservation plate to be selected:
one-layer heat insulation board: according to the calculation formula of thermal resistance
RXPS＝Sheet/λSheet
Calculate outSheet，Sheet、λSheetThe thickness and the heat conductivity coefficient of the heat insulation material selected for the single-layer heat insulation board respectively;
a plurality of layers of insulation boards: the thickness of each layer of heat insulation material of the multilayer heat insulation board is selected randomly1、2...nAnd the thickness of each layer of heat-insulating material satisfies the equation
RXPS＝R1+R2+…+Rn＝1/λ1+2/λ2+…+n/λn；
Wherein R is1、R2...RnThe thermal resistance value of each layer of thermal insulation material of the multilayer thermal insulation board; lambda [ alpha ]1、λ2...λnIs the heat conductivity coefficient of each layer of heat insulation material of the multilayer heat insulation board.
2. The method for rapidly detecting the temperature rise of the concrete according to claim 1, wherein in step S2, a thin film is closely attached to the inside of the heat-preservation mold.
3. The method for rapidly detecting the temperature rise of the concrete according to claim 2, wherein the film is made of hydrophobic and waterproof materials, and the heat-resistant temperature is not lower than 90 ℃.
4. The method for rapidly detecting the temperature rise of the concrete according to claim 3, wherein the film is any one of polyvinyl chloride, polyethylene, polypropylene and polystyrene.
5. The method for rapidly detecting the temperature rise of concrete according to claim 1, wherein in step S3, concrete is poured in the heat preservation mold for a time period not exceeding 30 min.
6. The method for rapidly detecting the temperature rise of the concrete according to claim 1, wherein in step S3, the temperature sensor is embedded in a manner that: fixing a temperature sensor at one end of a rod with scales, penetrating the rod through an upper cover of the heat-insulation mould, inserting the temperature sensor into concrete, and fixing the rod on the upper cover of the heat-insulation mould through a buckle.
7. The method for rapidly detecting the temperature rise of the concrete according to claim 1, wherein in the step S3, the testing time interval is not less than 1 time/hour.
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| CN111398347A (en) * | 2020-03-02 | 2020-07-10 | 武汉理工大学 | Device and method for measuring temperature rise of carbonization reaction |
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