CN109030794A - A kind of concrete temperature rise rapid detection method - Google Patents
A kind of concrete temperature rise rapid detection method Download PDFInfo
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- CN109030794A CN109030794A CN201810826374.7A CN201810826374A CN109030794A CN 109030794 A CN109030794 A CN 109030794A CN 201810826374 A CN201810826374 A CN 201810826374A CN 109030794 A CN109030794 A CN 109030794A
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- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 238000009413 insulation Methods 0.000 claims abstract description 60
- 239000010410 layer Substances 0.000 claims abstract description 26
- 239000012774 insulation material Substances 0.000 claims abstract description 22
- 239000002356 single layer Substances 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 238000004364 calculation method Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 13
- 239000004793 Polystyrene Substances 0.000 claims description 9
- 229920002223 polystyrene Polymers 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 230000002209 hydrophobic effect Effects 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 11
- 238000011534 incubation Methods 0.000 abstract description 5
- 238000004088 simulation Methods 0.000 description 9
- 239000011490 mineral wool Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000004227 thermal cracking Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 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
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The present invention discloses a kind of concrete temperature rise rapid detection method, firstly, selecting one or more thermal insulation materials, and calculates the thickness of each layer thermal insulation material, and single-layer or multi-layer insulation board is made in fitting；Secondly, insulation board to be cut to by certain size and assembled the heat insulation mould of squarely, make the internal capacity of heat insulation mould having a size of 400~500mm square；Finally, using composition of raw materials identical with concrete to be measured, preparation method, enter mould condition, the casting concrete in heat insulation mould；Then temperature sensor is embedded in concrete, covers the upper cover of heat insulation mould, recorded concrete internal temperature by set test interval, draw temperature rise curve.This method is using the XPS insulation board with a thickness of 100mm as standard incubation mold, thickness needed for calculating the insulation board using other thermal insulation materials using thermal resistance calculation formula, it is applicable not only to single layer, multilayer insulant is applied also for, the variation of concrete internal temperature can be evaluated more reliable, true, comprehensive, scientifically.
Description
Technical field
The invention belongs to technical field of concrete preparation, especially a kind of concrete temperature rise rapid detection method.
Background technique
In recent years, with to strength grade of concrete, the raising that mixture working performance requires, cementitious material in concrete
Dosage increases, and all kinds of additives introduce, so that the complication of gelling system, causes concrete structure early stage, later period non-load
Crack constantly occurs the phenomenon that increasing, quite a few is since the heat of cementitious material hydration reaction generation is quick among these
Accumulation, so that inside concrete heating is too fast excessively high, thermal cracking caused by concrete structure internal-external temperature difference is excessive, greatly
Affect concrete structure self waterproofing and long durability energy.
Current common detection method has hydrated cementitious thermal method, Adiabatic temperature rise of concrete method, the test of both detection methods
Period is longer, and usual 7-28 days, and also it is high to the precision of instrument and equipment, stability requirement, but cannot intuitively, quickly, completely
Reflect engineering site concrete temperature rise process.However, passing through thermometric, detection match ratio in engineering site concrete solid structure
Optimize, the effect after additive use, not only heavy workload, and the security performance of concrete structure is adversely affected.Institute
To develop a kind of concrete temperature rise rapid detection method in a laboratory environment, for Design and optimization concrete mix, close
Reason uses concrete admixture, reduces inside concrete temperature rise, reduces internal-external temperature difference, the generation of thermal cracking is reduced, to coagulation
The raising of the quality of native building can play a positive role.
In the prior art, be mostly the component of the similar functions such as temperature sensor is just synchronized in concreting it is embedded
In concrete, such as a kind of patent " CFST Arch Bridge pipe inner concrete temperature point of Patent No. 2017209276336
The measuring system of cloth " sets multiple retaining rings in steel pipe inner wall, and each retaining ring is equipped with temperature sensor for measuring figure solidification and supporting
Temperature change when shield.On-site actual situations when in order to meet concrete setting and maintenance, this test are needed in construction work
Ground scene is completed, and experimental enviroment is harsh, and cumbersome complexity is very high to the technical requirements of testing crew.In another example Patent No.
2015204144789 patent " concrete temperature rise test incubation chamber ", devises a kind of relatively small incubation chamber, is used for
The temperature rise situation of experimental situation Imitating concrete on construction site solidification and maintenance processes indoors, to prejudge construction site
Inside concrete temperature rise change procedure.Although this incubation chamber has certain innovation in structure, with regard to how truly to simulate
In terms of the environment of construction site, which is not disclosed corresponding technical method.In another example Patent No. 201410086731.2
Patent " a kind of method of inverting Adiabatic temperature rise of concrete ", mainly has studied the temperature of inside concrete different location at any time
Changing rule, and be directed to different sizes and shapes concrete, how using thermal insulation material composition size suitably keep the temperature
Box, has reached most accurate simulation effect, which lacks research.If having lacked this research, the mould of selected simulation
The size and material category of tool are just difficult to scientifically be fitted with actual conditions, cause the result of simulation test that can not react coagulation
True internal temperature rise situation when soil solidification and maintenance.
Summary of the invention
In order to reach in concrete temperature rise simulation test, the heat insulation mould of selection to practical concrete temperature rise process most
Good fitting effect, the present invention provides a kind of concrete temperature rise rapid detection methods, realize especially by following technology.
A kind of concrete temperature rise rapid detection method, comprising the following steps:
S1, the one or more thermal insulation materials of selection, and the thickness of each layer thermal insulation material is calculated, single-layer or multi-layer is made in fitting
Insulation board；
S2, the insulation board is cut to by certain size and is assembled the heat insulation mould of squarely, make the heat insulation mould
Internal capacity is having a size of 400~500mm square；
S3, using composition of raw materials identical with concrete to be measured, preparation method, enter mould condition, in the heat insulation mould
Casting concrete；Then temperature sensor is embedded in concrete, the upper cover of the heat insulation mould is covered, by between specific time
Every record concrete internal temperature, temperature rise curve is drawn；
Wherein, the calculation method of the thickness of each layer thermal insulation material in step S1 is as follows:
(1) the thermal resistance value R of standard x PS insulation board is calculatedXPS:
XPS insulation board, that is, extrusion molding polystyrene polyfoam for heat insulation plate；It is known when XPS insulation board is with a thickness of 100mm,
When the size of concrete cube is 400~500mm, concrete centre temperature rise curve with it is to be measured mixed having a size of 1000mm
The temperature rise curve in solidifying soil cube centre is equivalent；Utilize thermal resistance calculation formula
RXPS=δ0/λ0
Calculate RXPS, δ0For the thickness of XPS insulation board, i.e. 100mm；λ0It is known normal for the thermal coefficient of XPS insulation board
Number；
(2) the thickness δ of single-layer or multi-layer insulation board to be selected is calculatedIt is single:
1. Single-layer Insulation plate: according to thermal resistance calculation formula
RXPS=δIt is single/λIt is single
Calculate δIt is single, δIt is single、λIt is singleThe respectively thickness and thermal coefficient of thermal insulation material selected by Single-layer Insulation plate；
2. multi-layer heat preserving plate: the thickness δ of each layer thermal insulation material of any selection multi-layer heat preserving plate1、δ2...δn, and each layer is protected
The thickness of adiabator meets equation
RXPS=R1+R2+…+Rn=δ1/λ1+δ2/λ2+…+δn/λn；
Wherein, R1、R2...RnFor the thermal resistance value of each layer thermal insulation material of multi-layer heat preserving plate；λ1、λ2...λnFor multi-layer heat preserving
The thermal coefficient of each layer thermal insulation material of plate.
Preferably, in step S2, film is also closely covered in the heat insulation mould.
It is highly preferred that the material of the film is hydrophobic, material impervious to water, heat resisting temperature is not less than 90 DEG C.
It is further preferred that the film is any one of polyvinyl chloride, polyethylene, polypropylene, polystyrene.
Preferably, in step S3, the casting concrete in the heat insulation mould pours the time no more than 30min.
Preferably, in step S3, the embedding manner of the temperature sensor are as follows: be fixed on temperature sensor with a scale
Temperature sensor is inserted into concrete by the upper cover that the rod passes through the heat insulation mould by one end of rod, and the rod is logical
Buckle is crossed to be fixed on the upper lid of the heat insulation mould.
Preferably, in step S3, test interval is not less than 1 time/hour.
Compared with prior art, the invention has the beneficial effects that:
1, the whole detection complete temperature history of concrete, is provided especially for research and using mass concrete
Reliably, really, comprehensive scientific basis, evaluate the variation of concrete internal temperature, preferably for concrete mix optimization, outer
The effect for adding agent to apply provides data and supports；
2, it is standard incubation mold using the extrusion molding polystyrene polyfoam for heat insulation plate with a thickness of 100mm, calculates choosing
Required thermal insulation material thickness, is applicable not only to single layer when with other thermal insulation materials, applies also for multilayer insulant, thickness
Calculation is scientific and reasonable；
3, test data is fast, and workload is smaller, and normal concrete laboratory can be implemented, and concrete starts to survey after entering mould
Amount, acquisition include being reduced to the entire temperature history of room temperature from entering mould-Wen Feng-temperature.Test heat insulation mould can Reusability,
Experimental condition can be bonded engineering site actual conditions, can remove several heat preservation faces according to the engineering practice that need to be simulated, disappear
Influence except demoulding to the temperature history of concrete, test can directly be implemented in engineer application field test room, and former material is used in test
Material, ambient temperature condition are identical as live holding.
Detailed description of the invention
Fig. 1 is the simulation temperature rise curve of the concrete of embodiment 1；
Fig. 2 is the simulation temperature rise curve of the concrete of embodiment 2；
Fig. 3 is the simulation temperature rise curve of the concrete of embodiment 3；
Fig. 4 is the simulation temperature rise curve of the concrete of embodiment 4；
Fig. 5 is the simulation temperature rise curve of the concrete of comparative example 1.
Fig. 6 is the structural schematic diagram of heat insulation mould used by Examples 1 to 4.
Label in Fig. 6 is as follows:
1, Single-layer Insulation plate；2, upper cover；3, concrete；4, temperature sensor；5, rod.
Specific embodiment
Technical solution of the present invention will be clearly and completely described below, it is clear that described embodiment is only
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained, shall fall within the protection scope of the present invention under the conditions of not making creative work.
As shown in fig. 6, heat insulation mould selected by following embodiment selects single layer rock wool board as thermal insulation material, single layer rock
The thickness of cotton plate is calculated as 150mm through thermal resistance calculation formula, and the volume inside heat insulation mould is 450mm square, single layer rock wool board
Thickness specific calculating process it is as follows:
(1) the thermal resistance value R of standard x PS insulation board is calculatedXPS:
XPS insulation board, that is, extrusion molding polystyrene polyfoam for heat insulation plate；It is known when XPS insulation board is with a thickness of 100mm,
When the size of concrete cube is 450mm, concrete centre temperature rise curve and the concrete to be measured having a size of 1000mm
The temperature rise curve in cube centre is equivalent；Utilize thermal resistance calculation formula
RXPS=δ0/λ0
Calculate RXPS, δ0For the thickness of XPS insulation board, i.e. 100mm (0.1m)；λ0For the thermal coefficient of XPS insulation board, it is
Known constant takes 0.03W/mk；Therefore RXPSIt is calculated as 3.33 DEG C/W (retaining two-decimal)；
(2) the thickness δ of single layer rock wool board is calculatedRock wool
According to thermal resistance calculation formula
RXPS=δRock wool/λRock wool
Known λRock woolTake 0.045W/mk, therefore, δRock woolIt is calculated as 150mm.
Embodiment 1
Concrete selected by the present embodiment, strength grade C50, concrete mix is as shown in table 1, adding manner
First to carry out mix with cementitious material, additive, coarse-fine aggregate, water, water-reducing agent are added, duration of mixing is no less than 150 seconds, is mixed
In 200 ± 20mm, concrete center measuring point buries 2 data lines simultaneously for solidifying soil slump control, detects complete from concrete
Start after entering mould, detection frequency is 2 times/min.Since engineering site construction usually forms heat dissipation in left and right form removal for 24 hours
Condition, for close to scene, concrete removes the thermal insulation material at the top of test heat insulation mould when entering mould for 24 hours.The temperature rise drawn
Curve is as shown in Figure 1.
1 embodiment of table, 1 concrete mix
Embodiment 2
Concrete selected by the present embodiment, it is substantially the same manner as Example 1, the difference is that, it is also added into raw material
Commercially available retarder I (phosphoric acid salt), additional amount are the 0.07% of binder total amount.The temperature rise curve drawn is as shown in Figure 2.
Embodiment 3
Concrete selected by the present embodiment, it is substantially the same manner as Example 1, the difference is that, it is also added into raw material
Commercially available retarder I (glucose), additional amount are the 0.07% of binder total amount.The temperature rise curve drawn is as shown in Figure 3.
Embodiment 4
Concrete selected by the present embodiment, it is substantially the same manner as Example 1, the difference is that, it is also added into raw material
Hydration inhibitors (hydroxy carboxylic acids, Wuhan Sanyuan Special Building Materials Co., Ltd.), additional amount is cementitious material
The 1.00% of total amount.The temperature rise curve drawn is as shown in Figure 4.
Comparative example 1
This comparative example is used to detect the temperature rise curve of practical concrete, compares the difference with embodiment 1.Selected by this comparative example
Concrete material formula, detection method for temperature rise are substantially the same manner as Example 1.The difference is that: this comparative example mold is adopted
With the wooden template of mechanism, template thickness 12mm, template periphery is supported with the flitch of 40*60mm and is fixed, other are such as wooden mould
Selection, the construction production of plate are carried out referring to the regulation of JGJ162 " building construction formwork technical specification of security ", and mould inside holds
Product is 1000mm square, that is, the side length of the concrete cube poured is 1000mm.The temperature rise curve drawn is as shown in Figure 5.
By the concrete temperature rise curve of comparative example 1 and comparative example 1, i.e. comparison diagram 1 and Fig. 5, the temperature of the two becomes
It is essentially identical to change curve.It follows that can effectively simulate reality using heat insulation mould provided by the invention and detection method for temperature rise
Temperature change of the border concrete when pouring, condensing.
Claims (7)
1. a kind of concrete temperature rise rapid detection method, which comprises the following steps:
S1, the one or more thermal insulation materials of selection, and the thickness of each layer thermal insulation material is calculated, single-layer or multi-layer heat preservation is made in fitting
Plate；
S2, the insulation board is cut to by certain size and is assembled the heat insulation mould of squarely, make the inside of the heat insulation mould
Volume size is 400~500mm square；
S3, using composition of raw materials identical with concrete to be measured, preparation method, enter mould condition, poured in the heat insulation mould
Concrete；Then temperature sensor is embedded in concrete, covers the upper cover of the heat insulation mould, remembered by test interval
Concrete internal temperature is recorded, temperature rise curve is drawn；
Wherein, the calculation method of the thickness of each layer thermal insulation material in step S1 is as follows:
(1) the thermal resistance value R of standard x PS insulation board is calculatedXPS:
XPS insulation board, that is, extrusion molding polystyrene polyfoam for heat insulation plate；It is known when XPS insulation board is with a thickness of 100mm, coagulation
When the size of native cube is 400~500mm, concrete centre temperature rise curve and the concrete to be measured having a size of 1000mm
The temperature rise curve in cube centre is equivalent；Utilize thermal resistance calculation formula
RXPS=δ0/λ0
Calculate RXPS, δ0For the thickness of XPS insulation board, i.e. 100mm；λ0It is known constant for the thermal coefficient of XPS insulation board；
(2) the thickness δ of single-layer or multi-layer insulation board to be selected is calculatedIt is single:
1. Single-layer Insulation plate: according to thermal resistance calculation formula
RXPS=δIt is single/λIt is single
Calculate δIt is single, δIt is single、λIt is singleThe respectively thickness and thermal coefficient of thermal insulation material selected by Single-layer Insulation plate；
2. multi-layer heat preserving plate: the thickness δ of each layer thermal insulation material of any selection multi-layer heat preserving plate1、δ2...δn, and each layer thermal insulating material
The thickness of material meets equation
RXPS=R1+R2+…+Rn=δ1/λ1+δ2/λ2+…+δn/λn；
Wherein, R1、R2...RnFor the thermal resistance value of each layer thermal insulation material of multi-layer heat preserving plate；λ1、λ2...λnFor multi-layer heat preserving plate
The thermal coefficient of each layer thermal insulation material.
2. a kind of concrete temperature rise rapid detection method according to claim 1, which is characterized in that in step S2, in institute
It states and is also closely covered with film in heat insulation mould.
3. a kind of concrete temperature rise rapid detection method according to claim 2, which is characterized in that the material of the film
For hydrophobic, material impervious to water, heat resisting temperature is not less than 90 DEG C.
4. according to a kind of described in any item concrete temperature rise rapid detection methods of claim 3, which is characterized in that the film
For any one of polyvinyl chloride, polyethylene, polypropylene, polystyrene.
5. a kind of concrete temperature rise rapid detection method according to claim 1, which is characterized in that in step S3, in institute
Casting concrete in heat insulation mould is stated, pours the time no more than 30min.
6. a kind of concrete temperature rise rapid detection method according to claim 1, which is characterized in that described in step S3
The embedding manner of temperature sensor are as follows: temperature sensor is fixed on to one end of rod with a scale, the rod is passed through into institute
Temperature sensor is inserted into concrete by the upper cover for stating heat insulation mould, and the rod is fixed by snap in the upper of the heat insulation mould
It covers.
7. a kind of concrete temperature rise rapid detection method according to claim 1, which is characterized in that in step S3, test
Time interval is not less than 1 time/hour.
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| CN112835393A (en) * | 2021-01-06 | 2021-05-25 | 中铁大桥局集团有限公司 | Mass concrete temperature control system and method |
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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 |
| CN112835393A (en) * | 2021-01-06 | 2021-05-25 | 中铁大桥局集团有限公司 | Mass concrete temperature control system and method |
| CN112835393B (en) * | 2021-01-06 | 2022-04-01 | 中铁大桥局集团有限公司 | Mass concrete temperature control system and method |
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