CN109443635A - The predictor method at Cement Concrete Pavement Slab zero stress moment under general environment - Google Patents
The predictor method at Cement Concrete Pavement Slab zero stress moment under general environment Download PDFInfo
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- CN109443635A CN109443635A CN201811174893.6A CN201811174893A CN109443635A CN 109443635 A CN109443635 A CN 109443635A CN 201811174893 A CN201811174893 A CN 201811174893A CN 109443635 A CN109443635 A CN 109443635A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
Abstract
The invention belongs to highways and urban road cement concrete pavement technical field, it is related to a kind of predictor method that general environment was got down the highway with the urban road Cement Concrete Pavement Slab zero stress moment, the solidification temperature including reduced scale concrete sample under the conditions of 1) calculating constant temperature and humidity；2) solidification temperature of reduced scale concrete sample and the relational model at zero stress moment under the conditions of building constant temperature and humidity；3) the equivalent solidification temperature temperature got down the highway in general environment with urban road Cement Concrete Pavement Slab is calculated；4) it will get down the highway in general environment and substituted into relational model with the equivalent solidification temperature of urban road Cement Concrete Pavement Slab, obtain the zero stress moment got down the highway in general environment with urban road Cement Concrete Pavement Slab.The blindness and parameter can be provided for highway and urban road Cement Concrete Pavement Slab stress accurate measurements that initial time selects when the present invention can overcome in existing Cement Concrete Pavement Slab stress monitoring technology.
Description
Technical field
The invention belongs to highways and urban road cement concrete pavement technical field, are related to a kind of cement concrete pavement
The predictor method at plate zero stress moment more particularly to a kind of general environment are got down the highway and urban road Cement Concrete Pavement Slab zero
The predictor method at stress moment.
Background technique
Cement concrete is a kind of multiphase, multicomponent composite materials, and with the progress of hydration reaction, material is gradually by flowing
State develops to mouldable state, hardening state.In the process, the strain of inside concrete is changing always, but structural stress is until mixed
That time that solidifying soil starts hardening just gradually appears.That is: there is " zero " stress moment in concrete structure, and the moment is with strain
It is different at the time of zero.Therefore, when calculating the elastic stress of Cement Concrete Pavement Slab structure using actual measurement strain, elasticity modulus,
The initial time for surveying strain must match with the zero stress moment.Otherwise, initial time selection is improper, and stress state may go out
Existing severe deviations.
However, in current Cement Concrete Pavement Slab strain monitoring technology, no matter electric resistance wire strain gauge or string formula,
Fiber Bragg grating type strain gauge, initial time are difficult to cooperate with the zero stress moment, and measuring instrument is often reset the moment by user
The initial time as strain acquirement is strained, and using the moment as the strain increment at starting point calculated for subsequent moment, the delta package
Contained creep, inelastic strain caused by shrinkage factor etc..The stress calculated based on the strain increment certainly will be with elasticity
Stress has larger difference.
To solve this problem, Jung proposes the method for replacing the zero stress moment using setting time, also has both at home and abroad
Penetration resistance method, resistivity method measure the report of setting time early stage of concrete.But these methods are confined to constant temperature and humidity
This specific environment.In fact, in addition to environment epidemic disaster, the hardening process of Cement Concrete Pavement Slab under general health environment
Setting time and general ring also by a variety of inherent, external factor complex effects such as material, wind speed, radiation, under specific environment
There are significant differences in border, cannot offer reference for the initial time of strain acquirement.
Summary of the invention
In order to solve the above technical problems in background technology, the present invention provides one kind, and existing cement can be overcome mixed
The blindness that the zero stress moment selects when in solidifying dirt road panel stress monitoring technology into and can be highway and urban road water
Cement concrete road deck stress accurate measurements provide the side of estimating at Cement Concrete Pavement Slab zero stress moment in the environment of parameter
Method.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of predictor method that general environment was got down the highway with the urban road Cement Concrete Pavement Slab zero stress moment, it is special
Sign is: the predictor method the following steps are included:
1) temperature representative value changes with time after reduced scale concrete sample self-forming under the conditions of calculating constant temperature and humidity；
2) the temperature representative value after reduced scale concrete sample self-forming under the conditions of the constant temperature and humidity that step 1) is calculated
On the basis of, it draws temperature representative value, strain from the when varied curve after specimen molding；
3) feature that two obtained curves are drawn according to step 2), determines reduced scale concrete sample under the conditions of constant temperature and humidity
The zero stress moment and the moment corresponding test specimen temperature representative value, the temperature representative value of described moment corresponding test specimen
It is solidification temperature；
4) solidification temperature of reduced scale concrete sample and the relational model at zero stress moment under the conditions of building constant temperature and humidity；
5) principle equivalent according to maturity, calculates the general environment item equivalent with the solidification temperature under the conditions of constant temperature and humidity
The equivalent solidification temperature that part is got down the highway with urban road Cement Concrete Pavement Slab；
6) by step 5) it is obtained general environment condition get down the highway with urban road Cement Concrete Pavement Slab etc.
Effect solidification temperature substitutes into the relational model established of step 4), obtains zero of Cement Concrete Pavement Slab under the conditions of general environment
The stress moment.
Preferably, the specific implementation of step 1) of the present invention is:
1.1) reduced scale test is carried out using raw material identical with cement concrete slab to be measured and match ratio, in constant temperature perseverance
The temperature of wet bar part measurement reduced scale concrete sample different layers position changes with time；
1.2) step 1.1) measurement obtain in constant temperature and humidity under the conditions of reduced scale concrete sample different layers position temperature
On the basis of, using layerwise summation method, determine the temperature representative value of reduced scale concrete sample under the conditions of constant temperature and humidity:
Wherein:
TfIt is the temperature representative value of reduced scale concrete sample, DEG C；
TiIt is the observed temperature at measuring point i, DEG C；
hiIt is the height away from test specimen upper surface at measuring point i, cm；
H is the thickness of reduced scale concrete sample；
N is total number of plies of reduced scale concrete sample, and 1≤i≤N, i are natural numbers；
hi+1It is the height away from test specimen upper surface at measuring point i+1, cm；
Ti+1It is the observed temperature at measuring point i+1, DEG C.
Preferably, the specific implementation of step 2) of the present invention is:
2.1) it under the conditions of step 1.1) measures constant temperature and humidity while the temperature of reduced scale concrete sample different layers position, surveys
Determine the variation of equivalent layer position strain；
2.2) on the basis of the temperature representative value and step 2.1) that step 1.2) obtains obtain strain, reduced scale test specimen is drawn
After molding, strain, temperature representative value versus time curve.
Preferably, the specific embodiment of step 3) of the present invention is:
3.1) based on Glisic it is assumed that temperature representative value, strain by becoming in the same direction on two curves that determining step 2) obtains
Change the transient time to incorgruous variation, which is the zero stress moment of reduced scale concrete sample under the conditions of constant temperature and humidity；
3.2) the corresponding temperature representative value of the transient time is solidification temperature.
Preferably, the specific embodiment of step 4) of the present invention is: changing temperature and humidity conditions, carry out parallel
Test, establishes the relational model of reduced scale concrete sample solidification temperature and zero stress moment under the conditions of constant temperature and humidity.
Preferably, the specific embodiment of step 5) of the present invention is:
5.1) reduced scale concrete sample self-forming started to the zero stress moment under the conditions of calculating constant temperature and humidity using slices method
Between maturity；The maturity be the product of concrete curing time and temperature representative value and；
5.2) it under the conditions of step 1.1) measures constant temperature and humidity while the temperature of reduced scale concrete sample different layers position, surveys
Determine general environment condition and get down the highway to change with time with urban road Cement Concrete Pavement Slab local environment temperature；And it draws
Ambient air temperature versus time curve；
5.3) principle based on equivalent maturity is calculated as follows general environment and gets down the highway and urban road cement concrete
The equivalent solidification temperature of road deck:
Wherein:
Tf,nIt is the equivalent solidification temperature that general environment is got down the highway with urban road Cement Concrete Pavement Slab, DEG C；
Tf,aIt is ambient air temperature, DEG C；
η is correction factor, described
Tf,20It is the temperature representative value of reduced scale concrete sample under the conditions of 20 DEG C of constant humidity, DEG C；
T is the zero stress moment of reduced scale concrete sample under the conditions of 20 DEG C of constant humidity.
The invention has the following advantages that
It gets down the highway The present invention gives general environment and urban road Cement Concrete Pavement Slab zero stress moment is estimated
Method, can be used under general environment Cement Concrete Pavement Slab so that other concrete structure strain monitorings provide parameter according to
According to.Predictor method provided by the present invention is answered when being Cement Concrete Pavement Slab or even other concrete structure stress monitorings
The selection for becoming initial time provides parameter value foundation, solves and in the past answered the strain at measuring instrument clearing moment or factory
It is changed into as offset issue caused by initial strain；For engineering site Cement Concrete Pavement Slab under general environment or even other are mixed
Xtah Crude Clay structure object stress monitoring provides more practical, reliable parameter value method, solves penetration resistance method, resistivity method only
Suitable for constant temperature and humidity condition, the zero stress under the general environment influenced by complicated factors such as material, wind speed, radiation can not be instructed
The determination problem at moment.
Detailed description of the invention
Fig. 1 is the predictor method process at Cement Concrete Pavement Slab zero stress moment under general environment proposed by the present invention；
Fig. 2 is the schematic diagram (unit: cm) that strain, temperature are measured using the reduced scale test of the embodiment of the present invention；
Fig. 3 is the relation curve using characteristic temperature and zero stress moment under the conditions of the embodiment of the present invention constant temperature and humidity.
Specific embodiment
Referring to Fig. 1, gets down the highway the present invention provides a kind of general environment and answered with urban road Cement Concrete Pavement Slab zero
The predictor method at power moment, the predictor method the following steps are included:
1) temperature representative value changes with time after reduced scale concrete sample self-forming under the conditions of calculating constant temperature and humidity:
1.1) reduced scale test is carried out using raw material identical with cement concrete slab to be measured and match ratio, in constant temperature perseverance
The temperature of wet bar part measurement reduced scale concrete sample different layers position changes with time；
1.2) step 1.1) measurement obtain in constant temperature and humidity under the conditions of reduced scale concrete sample different layers position temperature
On the basis of, using layerwise summation method, determine the temperature representative value of reduced scale concrete sample under the conditions of constant temperature and humidity:
Wherein:
TfIt is the temperature representative value of reduced scale concrete sample, DEG C；
TiIt is the observed temperature at measuring point i, DEG C；
hiIt is the height away from test specimen upper surface at measuring point i, cm；
H is the thickness of reduced scale concrete sample；
N is total number of plies of reduced scale concrete sample, and 1≤i≤N, i are natural numbers；
hi+1It is the height away from test specimen upper surface at measuring point i+1, cm；
Ti+1It is the observed temperature at measuring point i+1, DEG C.
2) the temperature representative value after reduced scale concrete sample self-forming under the conditions of the constant temperature and humidity that step 1) is calculated
On the basis of, it draws temperature representative value, strain from the when varied curve after specimen molding:
2.1) it under the conditions of step 1.1) measures constant temperature and humidity while the temperature of reduced scale concrete sample different layers position, surveys
Determine the variation of equivalent layer position strain；
2.2) on the basis of the temperature representative value and step 2.1) that step 1.2) obtains obtain strain, reduced scale test specimen is drawn
After molding, strain, temperature representative value versus time curve.
3) feature that two obtained curves are drawn according to step 2), determines reduced scale concrete sample under the conditions of constant temperature and humidity
The zero stress moment and the moment corresponding test specimen temperature representative value, the temperature representative value of the moment corresponding test specimen is i.e.
Solidification temperature:
3.1) based on Glisic it is assumed that temperature representative value, strain by becoming in the same direction on two curves that determining step 2) obtains
Change the transient time to incorgruous variation, which is the zero stress moment of reduced scale concrete sample under the conditions of constant temperature and humidity；
3.2) the corresponding temperature representative value of the transient time is solidification temperature.
4) solidification temperature of reduced scale concrete sample and the relational model at zero stress moment under the conditions of building constant temperature and humidity；Change
Alternating temperature damp condition carries out parallel test, when establishing reduced scale concrete sample solidification temperature and zero stress under the conditions of constant temperature and humidity
The relational model at quarter.
5) principle equivalent according to maturity, calculates the general environment item equivalent with the solidification temperature under the conditions of constant temperature and humidity
The equivalent solidification temperature that part is got down the highway with urban road Cement Concrete Pavement Slab:
5.1) reduced scale concrete sample self-forming started to the zero stress moment under the conditions of calculating constant temperature and humidity using slices method
Between maturity；Maturity be the product of concrete curing time and temperature representative value and；
5.2) it under the conditions of step 1.1) measures constant temperature and humidity while the temperature of reduced scale concrete sample different layers position, surveys
Determine general environment condition and get down the highway to change with time with urban road Cement Concrete Pavement Slab local environment temperature；And it draws
Ambient air temperature versus time curve；
5.3) principle based on equivalent maturity is calculated as follows general environment and gets down the highway and urban road cement concrete
The equivalent solidification temperature of road deck:
Wherein:
Tf,nIt is the equivalent solidification temperature that general environment is got down the highway with urban road Cement Concrete Pavement Slab, DEG C；
Tf,aIt is ambient air temperature, DEG C；
η is correction factor,
Tf,20It is the temperature representative value of reduced scale concrete sample under the conditions of 20 DEG C of constant humidity, DEG C；
T is the zero stress moment of reduced scale concrete sample under the conditions of 20 DEG C of constant humidity.
6) by step 5) it is obtained general environment condition get down the highway with urban road Cement Concrete Pavement Slab etc.
Effect solidification temperature substitutes into the relational model established of step 4), obtains zero of Cement Concrete Pavement Slab under the conditions of general environment
The stress moment.
Below in conjunction with specific embodiment, technical solution provided by the present invention is described in detail: strain acquirement
The calculating of initial time:
1) calculating of constant temperature and humidity Under Concrete solidification temperature
1.1) 6 groups of concrete are poured according to Fig. 2 illustrated dimension and position using match ratio shown in table 1, buries answer respectively
Become meter and temperature sensor.After the completion of pouring, it is respectively placed in constant temperature (10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C) constant humidity (95%)
Condition and outdoor health.Using 5min as the counting interval, record strain, temperature change with time.
1 match ratio of table
1.2) according to formula 1, when calculating N=5, the temperature representative value of reduced scale concrete sample, is enumerated under the conditions of constant temperature and humidity
The temperature representative value at a certain moment is as shown in table 2:
In formula:
TfFor the temperature representative value of reduced scale concrete sample, DEG C；
TiFor the observed temperature at measuring point i, DEG C；
hiFor the height away from test specimen upper surface at measuring point i, cm；
H is the thickness of test specimen.
Under the conditions of 2 constant temperature and humidity of table when certain moment concrete temperature representative value
2) constant temperature and humidity Under Concrete zero stress moment is estimated
2.1) on the basis of step 1), the strain of reduced scale concrete sample, temperature representative under the conditions of drafting constant temperature and humidity
It is worth versus time curve.
2.2) based on Glisic it is assumed that determining temperature representative value on curve, strain from changing in the same direction to the mistake of incorgruous variation
The moment is crossed, which is the zero stress moment, and the moment, corresponding temperature representative value was solidification temperature.
It is computed, when concrete reaches zero stress state, when maintenance under the conditions of 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C
Between, i.e. the zero stress moment is as shown in table 3:
The zero stress moment of 3 constant temperature and humidity Under Concrete of table
2.3) Matlab is used, fitting obtains the relationship at constant temperature and humidity Under Concrete zero stress moment and solidification temperature
The predictor of model, such as Fig. 3, zero stress moment is as follows:
T=133.7TF, t -0.9(R2=0.95)
In formula: T is the zero stress moment；TF, tFor solidification temperature.
3) under general environment the equivalent solidification temperature of Cement Concrete Pavement Slab calculating
3.1) by 2.2) it is found that 20 DEG C, zero stress moment of 95% Under Concrete be 6.9h；
3.2) ambient air temperature T under the conditions of drafting general environmentf,aVersus time curve, and calculate the section 0h~6.9h
Cement concrete slab maturity；
3.3) principle equivalent based on maturity, by formula 2) calculate general environment under concrete equivalent solidification temperature.
Correction factor
Wherein:
Slices method approximate calculation T can be usedf,20The area that time shaft surrounds in curve and the section 0~T, can also
Fitting function, Integration Solving.This example is calculated using slices method, about 366.7 (DEG C h).
Slices method approximate calculation T can be usedf,aThe area that time shaft surrounds in curve and the section 0~T, can also intend
Close function, Integration Solving.This example is calculated using slices method, about 341.0 (DEG C h)
Then
4) the concrete zero stress moment is estimated under general environment: by TF, n=45.9 DEG C are brought into the relationship that step 2) is established
Model, obtaining the zero stress moment under general environment is 4.27h.
Claims (6)
- The predictor method with the urban road Cement Concrete Pavement Slab zero stress moment 1. a kind of general environment is got down the highway, feature Be: the predictor method the following steps are included:1) temperature representative value changes with time after reduced scale concrete sample self-forming under the conditions of calculating constant temperature and humidity；2) under the conditions of the constant temperature and humidity that step 1) is calculated after reduced scale concrete sample self-forming temperature representative value basis On, it draws temperature representative value, strain from the when varied curve after specimen molding；3) the obtained feature of two curves is drawn according to step 2), determines zero of reduced scale concrete sample under the conditions of constant temperature and humidity The temperature representative value of stress moment and the moment corresponding test specimen, the temperature representative value of described moment corresponding test specimen are solid Change temperature；4) solidification temperature of reduced scale concrete sample and the relational model at zero stress moment under the conditions of building constant temperature and humidity；5) according to the equivalent principle of maturity, under the conditions of calculating the general environment equivalent with the solidification temperature under the conditions of constant temperature and humidity The equivalent solidification temperature of highway and urban road Cement Concrete Pavement Slab；6) by step 5) it is obtained get down the highway in general environment condition it is equivalent solid with urban road Cement Concrete Pavement Slab Change temperature to substitute into the relational model that step 4) is established, obtains the zero stress of Cement Concrete Pavement Slab under the conditions of general environment Moment.
- 2. general environment according to claim 1 is got down the highway and the urban road Cement Concrete Pavement Slab zero stress moment Predictor method, it is characterised in that: the specific implementation of the step 1) is:1.1) reduced scale test is carried out using raw material identical with cement concrete slab to be measured and match ratio, in constant temperature and humidity item The temperature of part measurement reduced scale concrete sample different layers position changes with time；1.2) step 1.1) measurement obtain in constant temperature and humidity under the conditions of reduced scale concrete sample different layers position temperature basis On, using layerwise summation method, determine the temperature representative value of reduced scale concrete sample under the conditions of constant temperature and humidity:Wherein:TfIt is the temperature representative value of reduced scale concrete sample, DEG C；TiIt is the observed temperature at measuring point i, DEG C；hiIt is the height away from test specimen upper surface at measuring point i, cm；H is the thickness of reduced scale concrete sample；N is total number of plies of reduced scale concrete sample, and 1≤i≤N, i are natural numbers；hi+1It is the height away from test specimen upper surface at measuring point i+1, cm；Ti+1It is the observed temperature at measuring point i+1, DEG C.
- 3. general environment according to claim 2 is got down the highway and the urban road Cement Concrete Pavement Slab zero stress moment Predictor method, it is characterised in that: the specific implementation of the step 2) is:2.1) under the conditions of step 1.1) measures constant temperature and humidity while the temperature of reduced scale concrete sample different layers position, phase is measured The variation for answering layer position to strain；2.2) on the basis of the temperature representative value and step 2.1) that step 1.2) obtains obtain strain, reduced scale specimen molding is drawn Afterwards, strain, temperature representative value versus time curve.
- 4. general environment according to claim 3 is got down the highway and the urban road Cement Concrete Pavement Slab zero stress moment Predictor method, it is characterised in that: the specific embodiment of the step 3) is:3.1) based on Glisic it is assumed that determine temperature representative value on obtained two curves of step 2), strain from change in the same direction to The transient time of incorgruous variation, the moment are the zero stress moment of reduced scale concrete sample under the conditions of constant temperature and humidity；3.2) the corresponding temperature representative value of the transient time is solidification temperature.
- 5. general environment according to claim 4 is got down the highway and the urban road Cement Concrete Pavement Slab zero stress moment Predictor method, it is characterised in that: the specific embodiment of the step 4) is: changing temperature and humidity conditions, carries out parallel test, builds The relational model of reduced scale concrete sample solidification temperature and zero stress moment under the conditions of vertical constant temperature and humidity.
- 6. general environment according to claim 5 is got down the highway and the urban road Cement Concrete Pavement Slab zero stress moment Predictor method, it is characterised in that: the specific embodiment of the step 5) is:5.1) reduced scale concrete sample self-forming starts between the zero stress moment under the conditions of calculating constant temperature and humidity using slices method Maturity；The maturity be the product of concrete curing time and temperature representative value and；5.2) under the conditions of step 1.1) measures constant temperature and humidity while the temperature of reduced scale concrete sample different layers position, measurement one As environmental condition get down the highway and change with time with urban road Cement Concrete Pavement Slab local environment temperature；And draw environment Temperature versus time curve；5.3) principle based on equivalent maturity is calculated as follows general environment and gets down the highway and urban road cement concrete pavement The equivalent solidification temperature of plate:Wherein:Tf,nIt is the equivalent solidification temperature that general environment is got down the highway with urban road Cement Concrete Pavement Slab, DEG C；Tf,aIt is ambient air temperature, DEG C；η is correction factor, describedTf,20It is the temperature representative value of reduced scale concrete sample under the conditions of 20 DEG C of constant humidity, DEG C；T is the zero stress moment of reduced scale concrete sample under the conditions of 20 DEG C of constant humidity.
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