CN107621426A - The test method of cement paste extreme early modulus of elasticity - Google Patents
The test method of cement paste extreme early modulus of elasticity Download PDFInfo
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- CN107621426A CN107621426A CN201711019055.7A CN201711019055A CN107621426A CN 107621426 A CN107621426 A CN 107621426A CN 201711019055 A CN201711019055 A CN 201711019055A CN 107621426 A CN107621426 A CN 107621426A
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Abstract
The invention discloses a kind of cement paste extreme early modulus of elasticity method of testing, belong to building material field, this method obtains cement paste extreme early modulus of elasticity by way of macroscopic view actually measures, cone half-angle is used to be pressed into for 45 ° of mild steel pressure head using micro- force tester in the cement paste of non-form removal, load-displacement curve is obtained, modulus of elasticity is calculated using plunging principle.This method provides necessary mechanics parameter for numerical simulation, and method of testing is simple to operate, and accuracy is high.
Description
Technical field
The invention belongs to building material technical field, and in particular to a kind of experiment side of cement paste extreme early modulus of elasticity
Method.
Background technology
Modulus of elasticity is one of important mechanical property parameters, is reflected between stress suffered by material and produced strain
Relation, it is to weigh the index that material produces elastic deformation complexity.For cement-based material, modulus of elasticity is that structure is carried out
Important parameter necessary to mechanical analysis.The crack of structure, deformation and big can be calculated by the modulus of elasticity of cement-based material
Temperature stress of volume concrete etc..
At present, traditional modulus of elasticity method of testing is to apply load and the test of Light deformation measuring instrument using pressure testing machine
Deformation, the modulus of elasticity of concrete is calculated by the relation of stress and strain afterwards.In addition, some scholars are using ultrasound
Ripple method testing elastic modulus.Above method of testing is the modulus of elasticity tested after cement-based material form removal, for extreme early elasticity
Mould quantifier elimination, domestic and foreign scholars are analyzed from microcosmic angle, then take different modes to estimate its numerical value
Meter.Resistivity method and supercritical ultrasonics technology are combined, analyze hydration reaction, finally with its extreme early springform of resistivity Function Estimation
Amount, but its parameter have it is to be discussed；The time-varying variance after cement-based material initial set is derived from microcosmic angle；Using finite element to cement
The microstructure of sill is simulated, and obtains its extreme early modulus of elasticity.Up to now, do not occur also both at home and abroad a kind of from grand
See the method for testing for the cement-based material extreme early modulus of elasticity that angle is set out.
The content of the invention
The technical problem to be solved in the invention is to provide a kind of test method of cement paste extreme early modulus of elasticity, should
Method is simple to operate, accuracy is high, and provides necessary mechanics parameter for numerical simulation.
To solve the above problems, the technical solution used in the present invention is：
A kind of test method of cement paste extreme early modulus of elasticity, comprises the following steps：
1) concrete paste specimen is prepared
The cement paste of certain water-cement ratio is prepared, then cement paste is poured into mould, concrete paste specimen is made；
2) test specimen extreme early modulus of elasticity is tested using plunging, and records test data
When the cement paste surface in step 1) mould has certain degree of hardness-it is i.e. pre-hardening when, carry out extreme early springform
Measuring examination, test use can record the laboratory apparatus and conical indenter of loading of pressing in and compression distance, during test, conical indenter
Cone alignment concrete paste specimen surface press-in, test data records automatically or manual record；
3) the extreme early modulus of elasticity of calculation testing piece.
The wherein test data of the calculating data of step 3) record in step 2), loading of pressing in is formed by test data
With loading-unloading curve of compression distance, modulus of elasticity is calculated according to unloading curve, comprised the following steps that：
A, choose the 50% of unloading curve top to carry out curve fitting, obtain curvilinear equation
P=B (h-hf)m(1),
Wherein P is compressive load, and h is compression distance, hfFor remaining compression distance, B and m are fitting parameter, are applications
Origin softwares carried out curve fitting to the 50% of unloading curve top gained numerical value；
B, derivation is carried out to formula, obtains contact stiffness S,
Wherein hmaxFor maximum compression distance；
C, ask for contacting depth
Wherein ε is the parameter relevant with indenter shape, for conical indenter, ε=0.73；
D, equivalent elastic modulus E is asked forr(composite modulus determined based on instrumented indentation testing)
β is the parameter relevant with indenter shape, for axial symmetry pressure head β=1, A (ho&p) it is that contact depth is ho&pWhen institute
The corresponding area of indentation；
E, modulus of elasticity is asked for
ν is Poisson's ratio, EiAnd νiThe respectively modulus of elasticity and Poisson's ratio of conical indenter.
Preferably, the laboratory apparatus of step 2) is using the micro- force tester of high accuracy.
Preferably, the conical indenter selection cone half-angle is 45 ° of mild steel pressure head, and the height of conical indenter is 10mm,
For mild steel pressure head, Ei=206 × 103MPa, νi=0.26.
Further, when step 2) plunging is tested, the compression distance of conical indenter is 5mm, and displacement Loading Control is fast
Spend for 5mm/min.
It is using beneficial effect caused by above-mentioned technical proposal：
The present invention is become theory deduction and calculated into experiment, surveyed using the extreme early modulus of elasticity of plunging test cement paste
Method for testing is simple and convenient, and data are accurately reliable, and macroscopical plunging is tested applied to cement-based material extreme early modulus of elasticity, right
Engineering design provides reliable data.
Brief description of the drawings
Fig. 1 is loading of pressing in of the present invention-compression distance curve synoptic diagram；
Fig. 2 is that the cement paste modulus of elasticity that flyash parameter of the present invention is 0% changes over time curve map；
Fig. 3 is that the cement paste modulus of elasticity that flyash parameter of the present invention is 30% changes over time curve map；
Fig. 4 is that the cement paste modulus of elasticity that flyash parameter of the present invention is 60% changes over time curve map.
Embodiment
Invention is described in further detail below in conjunction with the accompanying drawings：
The present invention is a kind of method for testing cement paste extreme early modulus of elasticity, using micro- force tester and conical indenter
Tested, necessary mechanics parameter is provided for numerical simulation, compared with traditional theoretical derivation method, more science.
The test method of the present invention, comprises the following steps：
1) concrete paste specimen is prepared
The cement paste of certain water-cement ratio is prepared, then cement paste is poured into mould, concrete paste specimen is made；
For the ease of being verified to experimental data, the present invention prepares three groups of test specimens that water-cement ratio is respectively 0.25,0.35,0.35, water
Glue is than being pure water cement paste test specimen (binder materials is striaght cement) for 0.25 test specimen, and 2 group 0.35 of test specimen is powder respectively in addition
Coal ash parameter is 30% and 60% concrete paste specimen (binder materials is concrete and coal ash), is respectively charged into diameter 160mm,
High 69mm cylindrical plastic mould, 40mm × 40mm × 160mm steel mold and upper and lower diameter be respectively 65mm and 75mm,
In high 40mm circle mould.Test specimen wherein in cylindrical plastic mould is used for the extreme early springform of plunging test cement paste
Amount, every group of preparation 3.Test specimen in circle mould is used to test setting time, every group 1.Test specimen in steel mold is used to test water
Poisson's ratio during cement paste 12h and there is some strength, the modulus of elasticity after form removal, 6 test specimens of every group of preparation are used for Poisson's ratio
Measure, Poisson's ratio are to calculate the parameter of extreme early modulus of elasticity；In order to verify the accuracy of plunging, certain amount test specimen is prepared
For testing modulus of elasticity after form removal, due to that with striking time and plunging can be used to survey the extreme early modulus of elasticity time
Uncertainty, 9 test specimens of every group of preparation (general test 3-9).
2) test specimen extreme early modulus of elasticity is tested using plunging, and records test data
When the cement paste surface in step 1) mould has certain degree of hardness-it is i.e. pre-hardening when, carry out extreme early springform
Measuring examination, test use can record the laboratory apparatus and conical indenter of loading of pressing in and compression distance, during test, conical indenter
Cone alignment concrete paste specimen surface press-in, test data records automatically or manual record, conical indenter during test
Compression distance be 5mm, displacement Loading Control speed is 5mm/min.Every 1h tests once, until reaching the laboratory apparatus limit
Untill load；Laboratory apparatus is using the micro- force tester of high accuracy, ultimate load 2kN.Conical indenter selection cone half-angle for
45 ° of mild steel pressure head, the height of conical indenter is 10mm, for mild steel pressure head, Ei=206 × 103MPa, νi=0.26.
3) the extreme early modulus of elasticity of calculation testing piece
The test data of data record in the step 2) is calculated, test data is formed into loading of pressing in and compression distance
Loading-unloading curve, modulus of elasticity is calculated according to unloading curve, comprised the following steps that：
A, choose the 50% of unloading curve top to carry out curve fitting, obtain curvilinear equation
P=B (h-hf)m(1),
Wherein P is compressive load, and h is compression distance, hfFor remaining compression distance, B and m are fitting parameter, are applications
Origin softwares carry out curve fitting gained, B and m to the 50% of unloading curve top as the numerical value according to obtained by specific curve,
It can be directly obtained by Origin softwares；Origin softwares are that the more popular professional function plotting that OriginLab companies produce is soft
Part, it is generally acknowledged software easy to learn, operation is flexible, powerful, can both meets the drawing needs of general user, also may be used
With meet advanced level user's data analysis, Function Fitting needs.
B, derivation is carried out to formula, obtains contact stiffness S,
Wherein hmaxFor maximum compression distance；
C, ask for contacting depth
Wherein ε is the parameter relevant with indenter shape, for conical indenter, ε=0.73；
D, equivalent elastic modulus E is asked forr
β is the parameter relevant with indenter shape, for axial symmetry pressure head β=1, A (ho&p) it is that contact depth is ho&pWhen institute
The corresponding area of indentation；
E, modulus of elasticity is asked for
ν is Poisson's ratio, EiAnd νiThe respectively modulus of elasticity and Poisson's ratio of conical indenter.
The present invention is in experimentation, it is necessary to be measured to the setting time of cement paste：Contacted out from cement with water
Beginning timing, record the presetting period of cement paste.
The present invention is in experimentation, it is also necessary to cement paste Poisson's ratio tested, it is specific as follows：
Take the 6 40mm × 40mm × 160mm prepared test specimen, form removal after 12h, wherein 3 test specimens are used to determine axle
Heart compression strength (is used for load and the calculating modulus of elasticity for determining testing elastic modulus pre-pressing stage), and 3 test specimens are pasted in addition
Foil gauge, measure axial direction under pressure and transversely deforming.Applying pressure testing machine and statical strain indicator, according to《Commonly
Mechanical performance of concrete test method standard》Tested, finally draw Poisson's ratio of the cement paste in 12h.
After the extreme early modulus of elasticity of cement paste is calculated, in order to verify the correctness of the experimental method, it is necessary to adopt
It is as follows with the modulus of elasticity of conventional method test cement paste, detailed process：Treat that cement paste has some strength, form removal should
With the deformation of amesdial and WDW-50 micro-controls electronic universal tester test test specimen under stress, modulus of elasticity is calculated.
The extreme early modulus of elasticity of different mixture ratio cement paste is calculated by plunging, as shown in table 1：
Extreme early modulus of elasticity/MPa of the different mixture ratio cement paste of table 1
It is as shown in table 2 that conventional test methodologies measure cement paste modulus of elasticity：
Modulus of elasticity/MPa of the different mixture ratio cement paste of table 2
The cement paste modulus of elasticity time history plot that two kinds of method of testings are tried to achieve is drawn, as in Figure 2-4：
As can be seen that close using the modulus of elasticity numerical value obtained by two kinds of method of testings from Fig. 2-4, its error is respectively less than
15%, illustrate that plunging test cement paste extreme early modulus of elasticity has accuracy.Plunging can apply to test cement
Net slurry extreme early modulus of elasticity, this method scope of application are the cement paste that penetration hardness value is no more than 25MPa.
Claims (5)
1. a kind of test method of cement paste extreme early modulus of elasticity, it is characterised in that comprise the following steps：
1) concrete paste specimen is prepared
The cement paste of certain water-cement ratio is prepared, then cement paste is poured into mould, concrete paste specimen is made；
2) test specimen extreme early modulus of elasticity is tested using plunging, and records test data
When the cement paste surface in step 1) mould has certain degree of hardness-it is i.e. pre-hardening when, carry out extreme early springform measurement
Examination, test use can record the laboratory apparatus and conical indenter of loading of pressing in and compression distance, during test, the cone of conical indenter
The surface press-in of point alignment concrete paste specimen, test data records automatically or manual record；
3) the extreme early modulus of elasticity of calculation testing piece.
2. the test method of cement paste extreme early modulus of elasticity according to claim 1, it is characterised in that：Step 3)
The test data of data record in the step 2) is calculated, test data is formed into the loading of loading of pressing in and compression distance-unload
Curve is carried, modulus of elasticity is calculated according to unloading curve, comprised the following steps that：
A, choose the 50% of unloading curve top to carry out curve fitting, obtain curvilinear equation
P=B (h-hf)m(1),
Wherein P is compressive load, and h is compression distance, hfFor remaining compression distance, B and m are fitting parameter, are soft using origin
Part carried out curve fitting to the 50% of unloading curve top gained numerical value；
B, derivation is carried out to formula, obtains contact stiffness S,
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</mrow>
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</mrow>
Wherein hmaxFor maximum compression distance；
C, ask for contacting depth
Wherein ε is the parameter relevant with indenter shape, for conical indenter, ε=0.73；
D, equivalent elastic modulus E is asked forr
β is the parameter relevant with indenter shape, for axial symmetry pressure head β=1, A (ho&p) it is that contact depth is ho&pWhen it is corresponding
The area of indentation；
E, springform E is asked forr
<mrow>
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<mi>E</mi>
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ν is Poisson's ratio, EiAnd νiThe respectively modulus of elasticity and Poisson's ratio of conical indenter.
3. the test method of cement paste extreme early modulus of elasticity according to claim 1 or 2, it is characterised in that：Step
2) laboratory apparatus is using the micro- force tester of high accuracy.
4. the test method of cement paste extreme early modulus of elasticity according to claim 1 or 2, it is characterised in that：It is described
Conical indenter selection cone half-angle is 45 ° of mild steel pressure head, and the height of conical indenter is 10mm, for mild steel pressure head, Ei=
206×103MPa, νi=0.26.
5. the test method of cement paste extreme early modulus of elasticity according to claim 4, it is characterised in that：Step 2) is pressed
When entering method test, the compression distance of conical indenter is 5mm, and displacement Loading Control speed is 5mm/min.
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Cited By (2)
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| CN109520828A (en) * | 2018-10-11 | 2019-03-26 | 西北工业大学 | The elasticity modulus test method of film |
| CN117538154A (en) * | 2023-11-15 | 2024-02-09 | 东北石油大学 | 3D printing proportioning cement stone ultra-early short-term creep test method based on pressing method |
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| CN101126692A (en) * | 2007-09-18 | 2008-02-20 | 西南交通大学 | Method for ball-shape pressure head for determining shape memory alloy phase change property |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520828A (en) * | 2018-10-11 | 2019-03-26 | 西北工业大学 | The elasticity modulus test method of film |
| CN117538154A (en) * | 2023-11-15 | 2024-02-09 | 东北石油大学 | 3D printing proportioning cement stone ultra-early short-term creep test method based on pressing method |
| CN117538154B (en) * | 2023-11-15 | 2024-04-30 | 东北石油大学 | 3D printing proportioning cement stone ultra-early short-term creep test method based on pressing method |
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Application publication date: 20180123 |