CN107817266A - A kind of method for measuring concrete overall process linear expansion coefficient - Google Patents

A kind of method for measuring concrete overall process linear expansion coefficient Download PDF

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Publication number
CN107817266A
CN107817266A CN201711121082.5A CN201711121082A CN107817266A CN 107817266 A CN107817266 A CN 107817266A CN 201711121082 A CN201711121082 A CN 201711121082A CN 107817266 A CN107817266 A CN 107817266A
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China
Prior art keywords
concrete
temperature
linear expansion
expansion coefficient
environmental cabinet
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CN201711121082.5A
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Chinese (zh)
Inventor
王振红
张国新
刘毅
辛建达
张磊
朱振泱
汪娟
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China Institute of Water Resources and Hydropower Research
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China Institute of Water Resources and Hydropower Research
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Priority to CN201711121082.5A priority Critical patent/CN107817266A/en
Publication of CN107817266A publication Critical patent/CN107817266A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00Investigating or analyzing materials by the use of thermal means
    • G01N25/16Investigating or analyzing materials by the use of thermal means by investigating thermal coefficient of expansion

Abstract

A kind of method for measuring concrete overall process linear expansion coefficient, concrete raw material is stirred according to corresponding proportioning, is poured into accommodation space, is formed test specimen, cover and covered in temperature template;Temperature sensor is inserted respectively in the middle part of test specimen in trisection point, and environmental cabinet thermometer hole;Installation displacement transducer in the middle part of test specimen, and fixed with positioning tool, keep its position constant;Set the temperature history curve of corresponding temperature template and environmental cabinet;Positioning tool is removed after concrete initial set, starts to test, measures the contraction data of concrete.Before 1 day age, the linear expansion coefficient of concrete is determined by the linear expansion coefficient and aggregate ratio of cement mortar and aggregate;After 1 day age, the deflection under being changed by measurement temperature, to calculate the linear expansion coefficient of material.The present invention can be tested overall process linear expansion coefficient of the concrete under temperature change development condition, produced to grasp mechanical performance of concrete and crack preventing and provided reliable basis.

Description

A kind of method for measuring concrete overall process linear expansion coefficient
Technical field
The invention belongs to the technical field of Hydraulic and Hydro-Power Engineering, particularly a kind of measurement concrete overall process linear expansion coefficient Method.
Background technology
The crack problem of mass concrete always perplexs an important problem of domestic and international project circle, distress in concrete Appearance, not only affect the presentation quality of structure, also drastically influence the service life and safety of engineering, and then threaten people The lives and properties of the people.Therefore, the possibility for how avoiding the generation in crack or reducing crack generation just turns into engineering construction person institute Concern, particularly large volume concrete structural, thermal cracking are main crack forms.Up to now, to large volume The thermal cracking of concrete prevents from mainly in terms of following three setting about:(1) optimised coagulation soil structure, mechanical characteristic is improved;(2) material Improved in terms of material, optimised coagulation soil match ratio, improve the material property of concrete, it is true to grasp concrete heat mechanical characteristic;(3) Working measure is taken, reduces concrete temperature, prevents concrete from producing the excessive temperature difference.
Linear expansion coefficient is an important parameter of concrete, and the whether accurate of it directly affects concrete authentic material The control of performance, assess, affect the size of concrete for hydraulic structure calculation of temperature stresses, or even affect concrete for hydraulic structure temperature control and arrange The formulation and decision-making applied.Up to now, the measure of concrete for hydraulic structure linear expansion coefficient mainly passes through automatic controlled thermostat water tank With differential type strain ga(u)ge, the water temperature of concrete sample is submerged in insulating box by controlling to control the deformation of concrete, from And obtain the linear expansion coefficient of concrete.But the experimental provision and method also have the shortcomings that following several objective:1) by not having Enter the temperature of water to change the temperature of concrete, this method inherently changes concrete actual working environment, and concrete exists Soaking water and do not have performance of regimen condition itself can different, this method can not reflect that engineering is actual;2) current test specimen is at least It can be put into after 7d is conserved in thermostatted water, namely the concrete wire coefficient of expansion after 7d after age can only be done, it is impossible to which experiment is early The linear expansion coefficient of age concrete;3) current test method can only measure the linear expansion coefficient of concrete several ages, no The linear expansion coefficient of concrete overall process can be measured, it is impossible to more truly reflect the expansion characteristics of concrete.Therefore, a kind of water conservancy project The measurement apparatus and method of concrete overall process linear expansion coefficient just turn into needed for engineering construction.
The content of the invention
It is an object of the invention to provide a kind of method for measuring concrete overall process linear expansion coefficient, it can improve existing The limitation and deficiency of concrete for hydraulic structure overall process linear expansion coefficient test method, to concrete under temperature change development condition Overall process linear expansion coefficient is tested, for grasp mechanical performance of concrete and crack preventing produce provide reliably according to According to.
To achieve the above object, the present invention takes following technical scheme:
A kind of method for measuring concrete overall process linear expansion coefficient, it utilizes an experimental rig, the experimental rig bag A base is included, an environmental cabinet for being used to completely cut off external environment is provided with the base, being provided with concrete sample in the environmental cabinet holds Put device;
The concrete sample accommodating device includes fixed chuck, active chuck, two side templates, and split forms a upper end The open accommodation space of open or upper and lower side, the fixed chuck are fixedly installed on the environmental cabinet one end, and the active chuck can The environmental cabinet other end is movably arranged at along the axis of the length direction of the accommodation space, and two side templates are parallel, and to be placed in this solid Between clamp head and active chuck;The environmental cabinet or the environmental cabinet and the accommodation space set temperature sensor and humidity sensor Device;The environmental cabinet and concrete sample accommodating device are additionally provided with temperature-adjusting device and humidity control apparatus;
Also include a loading system;The loading system includes a reaction frame, a transmission device and one carries reductor Servomotor, the reaction frame are fixedly installed on the base, the environmental cabinet are surrounded;The transmission device includes being located at the counter-force Active leading screw on framework, the active leading screw end connection constraints axle, the constraint axle are worn and the work through the environmental cabinet and end Dynamic chuck connection, and the active chuck position is fixed or is moved in the axis direction;The servomotor and the active leading screw Connection;Measurement top is provided with the top of the constraint axle, displacement transducer is provided between the measurement top and the environmental cabinet;The transmission device is set There is strain gauge;
The temperature sensor, humidity sensor, displacement transducer, strain gauge are connected to the input of Measurement and Control System End, the temperature-adjusting device, humidity control apparatus and the servomotor are connected to the output end of Measurement and Control System;
During be poured into hardening, day age of important change, particularly 1 can occur concrete for its linear expansion coefficient Before phase and after 1 day age, the coefficient-of-linear-expansion difference of concrete is larger.Research shows that before 1 day age, concrete compares Softer, its linear expansion coefficient is had a great influence by water, and after 1 day age, its value is obviously reduced.
During experiment:
Concrete raw material is stirred according to corresponding proportioning, is poured into accommodation space, is formed test specimen, cover in temperature template Lid;Temperature sensor is inserted respectively in the middle part of test specimen in trisection point, and environmental cabinet thermometer hole;Installation displacement passes in the middle part of test specimen Sensor, and fixed with positioning tool, keep its position constant;The temperature history for setting corresponding temperature template and environmental cabinet is bent Line;Positioning tool is removed after concrete initial set, starts to test, measures the contraction data of concrete.
The measure equation of the linear expansion coefficient of the present invention carries out mathematical description according to formula below:
In formula, α is concrete whole process linear expansion coefficient, 10-6/ DEG C;CCFor the volume ratio of cement mortar in concrete, nothing Dimension;αaFor the linear expansion coefficient of aggregate in concrete, 10-6/ DEG C;CaFor the volume ratio of aggregate in concrete, dimensionless;t For the age of concrete, day;Δ ε be concrete deformation, dimensionless;Δ T is the temperature variation of concrete, DEG C.
Before 1 day age, the linear expansion coefficient of concrete by the linear expansion coefficient and aggregate ratio of cement mortar and aggregate come It is determined that;After 1 day age, the deflection under being changed by measurement temperature, to calculate the linear expansion coefficient of material.
Further, it is additionally provided with the environmental cabinet in solar radiation sensor, rainfall sensor and air velocity transducer At least one, it is respectively connecting to the input of the Measurement and Control System;Solar radiation tune is also correspondingly provided with the environmental cabinet At least one of regulating device, rainfall adjusting means and wind-speed adjusting device, are respectively connecting to the defeated of the Measurement and Control System Go out end;In measurement process, according to the actual change situation of construction ground illumination, rainfall and wind-force, adjusted by Measurement and Control System Save solar radiation, rainfall and the wind speed in environmental cabinet.
Further, before the test specimen is poured, " work " font is set between the fixed chuck and active chuck Keeper, the both ends of the keeper are fixedly connected with fixed chuck with active chuck by alignment pin respectively;And pouring examination Remove the keeper within 3 hours after part.
Further, in the process, for the simulation of true environment, using at least one in following steps:
1. environment temperature
Depending on the situation of locality, that is, the locality of true environment is simulated, above monthly mean temperature data is fitted to one Bar cosine curve, following formula (1) are the calculation formula after fitting:
In formula, TaFor temperature, TamFor average temperature of the whole year, AaFor temperature year luffing, τ is the time (moon), τ0For maximum temperature Time (moon).
Consider temperature diurnal variation, calculated using following formula (2):
In formula,For daily temperature, TaFor monthly mean temperature, A is temperature diurnal variation amplitude, at the time of t is in 1 day (when) Depending on the Various Seasonal of different regions;
2. solar radiant heat
Often under solar radiation, it has a major impact concrete structure to concrete temperature.Unit The heat that solar radiation comes in unit area in time is S, wherein the part by concrete absorption is set as R, remainder quilt Reflect away, then:
R=αs S (3)
In formula, αsFor absorption coefficient, also referred to as coefficient of blackness, concrete surface typically takes 0.65.
S=S0(1 kn) (4)
In formula, S0For fine day solar radiant heat, n is cloud amount, and k is coefficient, and these three numerical value can be provided by local weather station.
The influence of sunshine increases Δ T equivalent to the temperature of surrounding aira,
ΔTa=R/ β (5)
In formula, β is concrete surface exothermic coefficient, can be calculated according to surface roughness and wind speed.
3. precipitation
The precipitation of engineering location meteorological department is inquired about, by precipitation apparatus and precipitation amount controller come simulated precipitation;
And precipitation is calculated by formula (6),
Ps=Pt{1-exp[-(Ta-Tr)/(Tr-Ts)]2}+, Tr≥Ts
Pr=Pt-Ps (6)
P in formulasFor snowfall, PrFor rainfall, PtFor gross precipitation, TaFor daily mean temperature, TrFor the critical temperature of rainfall, TsFor the critical temperature of snowfall.
4. wind speed
Inquire about the wind speed of the meteorological department in engineering location, threshold wind velocity analogue means, to draw concrete according to wind speed Surface coefficient of heat transfer.
The beneficial effects of the invention are as follows:The method of present invention measurement concrete overall process linear expansion coefficient, it can be improved The limitation and deficiency of existing concrete for hydraulic structure overall process linear expansion coefficient test method, concrete is changed in actual environment condition Overall process linear expansion coefficient under development condition is tested, and is produced to grasp mechanical performance of concrete and crack preventing Reliable basis are provided.
Brief description of the drawings
Fig. 1 is the structural representation for the experimental provision that the method for present invention measurement concrete overall process linear expansion coefficient uses Figure.
Fig. 2 is the enlarged diagram at A in Fig. 1.
Fig. 3 is the knot of the keeper for the experimental provision that the method for present invention measurement concrete overall process linear expansion coefficient uses Structure schematic diagram.
Embodiment
Below only with the possible embodiment aspect of the embodiment explanation present invention, but and it is not used to limit the present invention and is intended to protect Category, first give chat it is bright.
As shown in Figure 1 and Figure 2, the present invention provides a kind of method for measuring concrete overall process linear expansion coefficient, and it utilizes one Individual experimental rig, the experimental rig include a base 1, and an environmental cabinet 2 for being used to completely cut off external environment is provided with the base 1, Concrete sample accommodating device is provided with the environmental cabinet 2.
The concrete sample accommodating device includes 4, two fixed chuck 3, active chuck side templates 5, and split forms one The accommodation space that upper end is open or upper and lower side is open, the fixed chuck 3 are fixedly installed on the one end of environmental cabinet 2, the activity Chuck 4 can be movably arranged at the other end of environmental cabinet 2 along the axis of the length direction of the accommodation space, and two side templates 5 are flat Row is placed between the fixed chuck 3 and active chuck 4.The environmental cabinet 2 or the environmental cabinet 2 and the accommodation space set temperature to pass Sensor and humidity sensor.The environmental cabinet 2 and concrete sample accommodating device are additionally provided with temperature-adjusting device and humidity regulation dress Put.
The experimental provision also includes a loading system.The loading system includes a reaction frame 6, a transmission device and a band There is the servomotor 7 of reductor, the reaction frame 6 is fixedly installed on the base 1, and the environmental cabinet 2 is surrounded.The transmission device Including the active leading screw on the reaction frame 6, the active leading screw end connection constraints axle 8, the constraint axle 8 passes through the environment Case 2 and end are worn to be connected with the active chuck 4, and causes the position of active chuck 4 to fix or moved in the axis direction.This is watched Motor 7 is taken to be connected with the active leading screw.The top of constraint axle 8 is provided with measurement top 9, is provided between the measurement top 9 and the environmental cabinet Displacement transducer 10, the transmission device are provided with strain gauge 11.
The temperature sensor, humidity sensor, displacement transducer 10, strain gauge 11 are connected to Measurement and Control System Input, the temperature-adjusting device, humidity control apparatus and the servomotor 7 are connected to the output end of Measurement and Control System.
During measurement, concrete raw material is stirred according to corresponding proportioning, is poured into accommodation space, is formed test specimen, cover temperature Covered in degree template;Temperature sensor is inserted respectively in the middle part of test specimen in trisection point, and environmental cabinet thermometer hole;Pacify in the middle part of test specimen Displacement transducer is filled, and is fixed with positioning tool, keeps its position constant;Set corresponding temperature template and the temperature of environmental cabinet Degree course curve;Positioning tool is removed after concrete initial set, starts to test, measures the contraction data of concrete.
The measure equation of the linear expansion coefficient of the present invention carries out mathematical description according to formula below:
In formula, α is concrete whole process linear expansion coefficient, 10-6/ DEG C;CCFor the volume ratio of cement mortar in concrete, nothing Dimension;αaFor the linear expansion coefficient of aggregate in concrete, 10-6/ DEG C;CaFor the volume ratio of aggregate in concrete, dimensionless;t For the age of concrete, day;Δ ε be concrete deformation, dimensionless;Δ T is the temperature variation of concrete, DEG C.
Before 1 day age, the linear expansion coefficient of concrete by the linear expansion coefficient and aggregate ratio of cement mortar and aggregate come It is determined that;After 1 day age, the deflection under being changed by measurement temperature, to calculate the linear expansion coefficient of material.
For more accurately construction simulation environment, solar radiation sensor, rainfall sensor are additionally provided with the environmental cabinet 2 At least one of with air velocity transducer, the input of the Measurement and Control System is respectively connecting to.It is also corresponding in the environmental cabinet 2 to set There are at least one of solar radiation adjusting means, rainfall adjusting means and wind-speed adjusting device, be respectively connecting to the measurement control The output end of system processed.In measurement process, according to the actual change situation of construction ground illumination, rainfall and wind-force, pass through measurement Solar radiation, rainfall and wind speed in control system adjusting ambient case 2.
In the process, for the simulation of true environment, using at least one in following steps:
1. environment temperature
Depending on the situation of locality, that is, the locality of true environment is simulated, above monthly mean temperature data is fitted to one Bar cosine curve, following formula (1) are the calculation formula after fitting:
In formula, TaFor temperature, TamFor average temperature of the whole year, AaFor temperature year luffing, τ is the time (moon), τ0For maximum temperature Time (moon).
Consider temperature diurnal variation, calculated using following formula (2):
In formula,For daily temperature, Ta is monthly mean temperature, and A is temperature diurnal variation amplitude, at the time of t is in 1 day (when) Depending on the Various Seasonal of different regions;
2. solar radiant heat
Often under solar radiation, it has a major impact concrete structure to concrete temperature.Unit The heat that solar radiation comes in unit area in time is S, wherein the part by concrete absorption is set as R, remainder quilt Reflect away, then:
R=αs S (3)
In formula, αsFor absorption coefficient, also referred to as coefficient of blackness, concrete surface typically takes 0.65.
S=S0(1 kn) (4)
In formula, S0For fine day solar radiant heat, n is cloud amount, and k is coefficient, and these three numerical value can be provided by local weather station.
The influence of sunshine increases Δ T equivalent to the temperature of surrounding aira,
ΔTa=R/ β (5)
In formula, β is concrete surface exothermic coefficient, can be calculated according to surface roughness and wind speed.
3. precipitation
The precipitation of engineering location meteorological department is inquired about, by precipitation apparatus and precipitation amount controller come simulated precipitation;
And precipitation is calculated by formula (6),
Ps=Pt{1-exp[-(Ta-Tr)/(Tr-Ts)]2}+, Tr≥Ts
Pr=PT-Ps (6)
P in formulasFor snowfall, PrFor rainfall, PtFor gross precipitation, TaFor daily mean temperature, TrFor the critical temperature of rainfall, TsFor the critical temperature of snowfall.
4. wind speed
Inquire about the wind speed of the meteorological department in engineering location, threshold wind velocity analogue means, to draw concrete according to wind speed Surface coefficient of heat transfer.
In order to keep test specimen consistent, as shown in figure 3, before the test specimen is poured, in the fixed chuck 3 and active chuck 4 Between set " work " font keeper 12, the both ends of the keeper pass through alignment pin with fixed chuck 3 and active chuck 4 respectively It is fixedly connected.And 3 hours after test specimen is poured remove the keeper 12.
The present invention compared with prior art, has following advantages:
1st, experimental rig of the present invention can the actual working environment of simulation concrete completely, concrete can be tested from pouring The evolution of its linear expansion coefficient, the evolution of particularly early age linear expansion coefficient into hardening overall process.
2nd, experimental rig of the present invention and method, can simulate the natural environment temperature residing for concrete for hydraulic structure, and reflection is true Engineering actual environment, draw the concrete for hydraulic structure linear expansion coefficient evolution under true environment temperature condition.
3rd, experimental rig of the present invention and method, the modulus of elasticity of concrete under any age can be tested out, it is particularly early The modulus of elasticity of age concrete linear expansion coefficient, important support is provided for the Concrete Temperature Control anticracking of early stage.
4th, experimental rig of the present invention and method, can be concrete with the linear expansion coefficient of experimental test concrete overall process Overall process thermodynamic behaviour control provide support.
The present invention is limited with described claim.But this is based on, one of ordinary skill in the art can do Go out a variety of obvious changes or change, all should be within the main spirits and protection domain of the present invention.

Claims (4)

  1. A kind of 1. method for measuring concrete overall process linear expansion coefficient, it is characterised in that it utilizes an experimental rig, the examination Experiment device includes a base, and an environmental cabinet for being used to completely cut off external environment is provided with the base, coagulation is provided with the environmental cabinet Native test specimen accommodating device;
    The concrete sample accommodating device includes fixed chuck, active chuck, two side templates, and split forms a upper end opening Or the accommodation space that upper and lower side is open, the fixed chuck are fixedly installed on the environmental cabinet one end, the active chuck can be along this The axis of the length direction of accommodation space is movably arranged at the environmental cabinet other end, and two side templates are parallel to be placed in the geometrical clamp Between head and active chuck;The environmental cabinet or the environmental cabinet and the accommodation space set temperature sensor and humidity sensor; The environmental cabinet and concrete sample accommodating device are additionally provided with temperature-adjusting device and humidity control apparatus;
    Also include a loading system;The loading system includes a reaction frame, a transmission device and a servo with reductor Motor, the reaction frame are fixedly installed on the base, the environmental cabinet are surrounded;The transmission device includes being located at the reaction frame On active leading screw, the active leading screw end connection constraints axle, the constraint axle is worn through the environmental cabinet and end and activity folder Head connection, and the active chuck position is fixed or is moved in the axis direction;The servomotor is connected with the active leading screw; Measurement top is provided with the top of the constraint axle, displacement transducer is provided between the measurement top and the environmental cabinet;The transmission device is provided with should Force snesor;
    The temperature sensor, humidity sensor, displacement transducer, strain gauge are connected to the input of Measurement and Control System, The temperature-adjusting device, humidity control apparatus and the servomotor are connected to the output end of Measurement and Control System;
    Concrete raw material is stirred according to corresponding proportioning, is poured into accommodation space, is formed test specimen, cover and covered in temperature template; Temperature sensor is inserted respectively in the middle part of test specimen in trisection point, and environmental cabinet thermometer hole;Installation displacement sensing in the middle part of test specimen Device, and fixed with positioning tool, keep its position constant;The temperature history for setting corresponding temperature template and environmental cabinet is bent Line;Positioning tool is removed after concrete initial set, starts to test, measures the contraction data of concrete;
    The measure equation of the linear expansion coefficient of the present invention carries out mathematical description according to formula below:
    In formula, α is concrete whole process linear expansion coefficient, 10-6/ DEG C;CCFor the volume ratio of cement mortar in concrete, dimensionless; αaFor the linear expansion coefficient of aggregate in concrete, 10-6/ DEG C;CaFor the volume ratio of aggregate in concrete, dimensionless;T is coagulation The age of soil, day;Δ ε be concrete deformation, dimensionless;Δ T is the temperature variation of concrete, DEG C;
    Before 1 day age, the linear expansion coefficient of concrete is determined by the linear expansion coefficient and aggregate ratio of cement mortar and aggregate; After 1 day age, the deflection under being changed by measurement temperature, to calculate the linear expansion coefficient of material.
  2. 2. the method for measurement concrete overall process linear expansion coefficient according to claim 1, it is characterised in that the environment At least one of solar radiation sensor, rainfall sensor and air velocity transducer are additionally provided with case, is respectively connecting to the survey The input of amount control system;Solar radiation adjusting means, rainfall adjusting means and wind speed are also correspondingly provided with the environmental cabinet At least one of adjusting means, it is respectively connecting to the output end of the Measurement and Control System;In measurement process, according to construction The actual change situation of ground illumination, rainfall and wind-force, by the solar radiation in Measurement and Control System adjusting ambient case, rainfall and Wind speed.
  3. 3. the method for measurement concrete overall process linear expansion coefficient according to claim 1, it is characterised in that pouring Before stating test specimen, the keeper of " work " font, the both ends point of the keeper are set between the fixed chuck and active chuck Not be fixedly connected with fixed chuck with active chuck by alignment pin;And 3 hours after test specimen is poured remove the keeper.
  4. 4. the method for measurement concrete overall process linear expansion coefficient according to claim 1, it is characterised in that in the side In method, the simulation for true environment, using at least one in following steps:
    1. environment temperature
    Depending on the situation of locality, that is, the locality of true environment is simulated, monthly mean temperature data is fitted to a cosine song Line, following formula (1) are the calculation formula after fitting:
    In formula, TaFor temperature, TamFor average temperature of the whole year, AaFor temperature year luffing, τ is the time (moon), τ0For the time of maximum temperature (moon).
    Consider temperature diurnal variation, calculated using following formula:
    In formula,For daily temperature, TaFor monthly mean temperature, A is temperature diurnal variation amplitude, at the time of t is in 1 day (when) according to not Depending on Various Seasonal with area;
    2. solar radiant heat
    The heat that solar radiation comes in unit area in unit interval is S, wherein setting the part by concrete absorption as R, is remained Remaining part point is reflected, then:
    R=αs S (3)
    In formula, αsFor absorption coefficient, concrete surface takes 0.65.
    S=S0(1 kn) (4)
    In formula, S0For fine day solar radiant heat, n is cloud amount, and k is coefficient.
    The influence of sunshine increases Δ T equivalent to the temperature of surrounding aira,
    ΔTa=R/ β (5)
    In formula, β is concrete surface exothermic coefficient, is calculated according to surface roughness and wind speed.
    3. precipitation
    The precipitation of engineering location meteorological department is inquired about, by precipitation apparatus and precipitation amount controller come simulated precipitation;
    And precipitation is calculated by formula (6),
    Ps=Pt{1-exp[-(Ta-Tr)/(Tr-Ts)]2}+, Tr≥Ts
    Pr=Pt-Ps (6)
    P in formulasFor snowfall, PrFor rainfall, PtFor gross precipitation, TaFor daily mean temperature, TrFor the critical temperature of rainfall, TsFor The critical temperature of snowfall.
    4. wind speed
    Inquire about the wind speed of the meteorological department in engineering location, threshold wind velocity analogue means, to draw concrete surface according to wind speed Coefficient of heat transfer.
CN201711121082.5A 2017-11-14 2017-11-14 A kind of method for measuring concrete overall process linear expansion coefficient Pending CN107817266A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102183540A (en) * 2011-01-24 2011-09-14 国网电力科学研究院 Stress-free strain related analysis method in concrete stress strain monitoring
CN104050387A (en) * 2014-06-27 2014-09-17 南京工程学院 Concrete thermal expansion coefficient prediction model construction method
CN105352876A (en) * 2015-09-09 2016-02-24 中国水利水电科学研究院 Real environment-based concrete cracking whole process test apparatus and method
CN105572027A (en) * 2016-02-19 2016-05-11 中国水利水电科学研究院 Concrete cracking whole-process simulating tester
CN105737784A (en) * 2016-02-19 2016-07-06 中国水利水电科学研究院 Testing machine displacement deformation measurement device
CN103837413B (en) * 2014-03-07 2017-01-25 中南大学 Concrete tensile creep testing device and concrete shrinkage stress creep testing method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102183540A (en) * 2011-01-24 2011-09-14 国网电力科学研究院 Stress-free strain related analysis method in concrete stress strain monitoring
CN103837413B (en) * 2014-03-07 2017-01-25 中南大学 Concrete tensile creep testing device and concrete shrinkage stress creep testing method
CN104050387A (en) * 2014-06-27 2014-09-17 南京工程学院 Concrete thermal expansion coefficient prediction model construction method
CN105352876A (en) * 2015-09-09 2016-02-24 中国水利水电科学研究院 Real environment-based concrete cracking whole process test apparatus and method
CN105572027A (en) * 2016-02-19 2016-05-11 中国水利水电科学研究院 Concrete cracking whole-process simulating tester
CN105737784A (en) * 2016-02-19 2016-07-06 中国水利水电科学研究院 Testing machine displacement deformation measurement device

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