CN102879266B - Method for testing uniaxial compression elasticity modulus of inorganic binder stabilizing material - Google Patents
Method for testing uniaxial compression elasticity modulus of inorganic binder stabilizing material Download PDFInfo
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- CN102879266B CN102879266B CN201210343703.5A CN201210343703A CN102879266B CN 102879266 B CN102879266 B CN 102879266B CN 201210343703 A CN201210343703 A CN 201210343703A CN 102879266 B CN102879266 B CN 102879266B
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Abstract
The invention discloses a method and a device for testing indoor uniaxial compression elasticity modulus of an inorganic binder stabilizing material and belongs to the field of road engineering tests. The method comprises the following steps of: continuously and uniformly applying axial pressure to a cylindrical test piece made of the inorganic binder stabilizing material in a monotonic loading mode by using a press until the maximum acting force which can be borne by the test piece is reached; and measuring axial deformation of an intermediate section of the test piece by utilizing an axial displacement sensor arranged on an intermediate section on a side face of the cylindrical test piece in the loading process, and determining the uniaxial compression elasticity modulus of the test piece in a linear range at the initial loading stage according to a stress-strain curve. Compared with the conventional testing method, the method for testing the indoor uniaxial compression elasticity modulus of the inorganic binder stabilizing material has the advantages that the adverse effect of an end face effect is eliminated, and the method has the characteristics of high measuring precision, high reproducibility, simplicity in test and the like and has high popularization and application value.
Description
Technical field
The present invention relates to road engineering test field, specifically a kind of uniaxial compression elasticity modulus test method in stabilized with inorganic binder usable material chamber.
Background technology
Stabilized with inorganic binder material plays a part very important in highway in China pavement construction, and it, as the main bearing stratum of pavement structure, decides the length of service life of road surface.The elastic modulus of material is as pavement structure main design parameters, and rationality and the economy of the accuracy road pavement structural design of its value have material impact.
Compression rebound modulu test method in existing stabilized with inorganic binder usable material chamber, test specimen axial deformation measurement point is positioned at bottom surface, test specimen top, adopts the load mode of successive loading off-load.Due to the impact of test specimen effect of end surface in loading procedure, the test specimen top bottom surface axial deformation recorded is made to be greater than actual axial deformation, thus make the elastic modulus recorded be less than the actual elastic modulus of material, add the load mode of complicated successive loading off-load, the poor repeatability of test, is difficult to draw true, reliable with consistent result.
The true elastic modulus how quick and precisely recording stabilized with inorganic binder class material has become one of road communications vocation focal issue urgently to be resolved hurrily.
Summary of the invention
Technical assignment of the present invention is for above-mentioned the deficiencies in the prior art, provides that a kind of measuring accuracy is high, repeatability good, uniaxial compression elasticity modulus test method in stabilized with inorganic binder usable material chamber easy and simple to handle.Utilize this test method can obtain reflecting the compressive modulus of elasticity of stabilized with inorganic binder material true strain-stress relation.
Technical assignment of the present invention realizes in the following manner: uniaxial compression elasticity modulus test method in stabilized with inorganic binder usable material chamber, be characterized in: with pressing machine, by dull load mode continuous uniform, axle pressure is applied to stabilized with inorganic binder material right cylinder test specimen, until reach the maximum force that test specimen can bear
In loading procedure, the shaft position sensor being arranged on right cylinder test specimen side interlude is utilized to measure the axial deflection of test specimen interlude, and according to the uniaxial compression elastic mould value of stress-strain curve at the range of linearity determination test specimen at the initial stage of loading.
In loading procedure, from starting loading, to last the maximum force reaching test specimen and can bear for 30 ~ 60 seconds.
Three shaft position sensors are placed in the middle part of test specimen side by fixture, shaft position sensor is vertical with test specimen end face, and equidistantly settle (namely every two shaft position sensors are at a distance of 120 °) along test specimen circumferencial direction, in loading procedure, the compress variation of test specimen interlude falls in the measurement range of shaft position sensor, and the axial deflection of test specimen interlude is the mean value that three shaft position sensors record compression deformation.
Described fixture is formed primarily of stiffening ring, bolt and detachable screw rod.
Two stiffening rings are fixed on test specimen side interlude respectively by bolt, and detachable screw rod is arranged between two stiffening rings, for determining two stiffening ring initial separation, i.e. and test specimen axial deformation measurement point spacing.
The end of described bolt is preferably semisphere, in order to avoid bolt injection is inner to test specimen, affects measuring accuracy.
The initial separation of two stiffening rings and the spacing of test specimen axial deformation measurement point are preferably 0.45 ~ 0.5 times of height of specimen.
The axial deformation of adopt microcomputer automatically to record in loading procedure load that test specimen bears every 0.001s after starting to load and generation.
Its elastic mould value is determined by stress and strain during 0.25 ~ 0.35 maximum force.
The diameter of described right cylinder test specimen is 1:1.2 ~ 1:1.8 with the ratio of height, and test specimen diameter is 100mm ~ 150mm.
Indoor employing vibration or hydrostatic profile right cylinder test specimen, right cylinder test specimen is prepared by boring core in scene, and right cylinder test specimen should meet design strength requirement.
Stabilized with inorganic binder material uniaxial compression elasticity modulus test method of the present invention compared with prior art has following outstanding beneficial effect:
1, interlude deformation measurement method overcomes the effect of end surface problem of bottom surface, existing test method top deformation measurement, obtains the compressive modulus of elasticity of reflection true strain-stress relation;
2, replace the load mode of existing test method successive loading off-load with dull linear loading, improve measuring accuracy, reproducibility of test is good, easy and simple to handle, the test period is short.
Accompanying drawing explanation
Accompanying drawing 1 is uniaxial compression elasticity modulus test apparatus structure schematic diagram of the present invention;
Accompanying drawing 2 is that front elevation installed by uniaxial compression elasticity modulus test sensor of the present invention;
Accompanying drawing 3 is that vertical view installed by uniaxial compression elasticity modulus test sensor of the present invention;
Accompanying drawing 4 is load in the embodiment of the present invention-strain curve figure.
Embodiment
Uniaxial compression elasticity modulus test method and device in stabilized with inorganic binder usable material chamber of the present invention are described in detail below with specific embodiment with reference to Figure of description.
Embodiment:
Test unit:
As shown in Figure 1, the test unit involved by process of the test and parts are mainly loading equipemtn, loading disc 1, LVDT sensor 2, stiffening ring 3, bolt 4, hinged bolt 5 and control system.
Test procedure:
A) test material preparation processing is tested
Adopt vibration or hydrostatic profile equipment is shaping or bore the right cylinder test specimen that diameter 100mm ~ 150mm prepared by core, diameter and the ratio of height are 1:1.2 ~ 1:1.8 at the scene, through indoor or on-the-spot health, shaping or drilling core needs to reach design strength requirement.
B) strain transducer is installed
As shown in accompanying drawing 2,3, two stiffening rings 3 are fixed in the middle part of right cylinder test specimen 6 respectively by three bolts 4,0.45 ~ 0.5 times that the initial separation (i.e. the spacing of axial deformation measurement point) of two stiffening rings 3 is height of specimen.Three LVDT sensors 2 are installed on the side in the middle part of test specimen 6 by stiffening ring 3.LVDT sensor 2 is vertical with test specimen end face, and equidistantly settles (namely every 2 apart 120 °) along test specimen circumferencial direction.Bolt 4 end is that semisphere is in order to avoid injection is inner to test specimen 6.In loading procedure, the mean value that three LVDT sensors 2 record compression deformation is the average axial deflection of test specimen interlude
, obtain strain stress thus.
Hinged bolt 5 is arranged between two stiffening rings 3.The length of hinged bolt 5 part between two stiffening rings 3 is identical with the spacing of LVDT sensor 2 measurement point, for determining the initial separation of two stiffening rings 3.
C) load application and data acquisition and procession
Loading disc 1 adopts hard steel plate or processed high strength aluminium sheet, and diameter is equal to or greater than the diameter of test specimen 6.Two loading discs 1 are placed in bottom and the top of test specimen 6 respectively, are used for load to pass to test specimen 6 from loading equipemtn.Need loading equipemtn to adopt dull load mode according to the loading velocity continuous uniform ground load application of setting, must not pause in loading procedure.
The determination of loading velocity: estimate the maximum force that test specimen can bear before loading, then does load test and makes to destroy in test specimen 30 ~ 60s, determine loading velocity thus.
Data acquisition: in process of the test, control system adopts microcomputer to control, the axial deformation of the load that record test specimen bears every 0.001s after starting to load and generation, and draws load-strain curve, as shown in Figure 4.
Data according to the curve record in Fig. 4 obtain
with 0.3
time corresponding strain
.
Data processing: according to the data gathered, elastic modulus
can be calculated by formula i.
Formula i:
: test specimen elastic modulus, MPa;
: the maximum force that test specimen bears, N;
: load reaches 0.3
time corresponding strain value, dimensionless;
: test specimen diameter, mm.
Claims (8)
1. stabilized with inorganic binder material uniaxial compression elasticity modulus test method, it is characterized in that: with pressing machine, by dull load mode continuous uniform, axle pressure is applied to stabilized with inorganic binder material right cylinder test specimen, until reach the maximum force that test specimen can bear
In loading procedure, the shaft position sensor being arranged on right cylinder test specimen side interlude is utilized to measure the axial deflection of test specimen interlude, and according to the uniaxial compression elastic mould value of stress-strain curve at the range of linearity determination test specimen at the initial stage of loading,
The measuring method of the axial deflection of described test specimen interlude: three shaft position sensors are placed in the middle part of test specimen side by fixture, shaft position sensor is vertical with test specimen end face, and equidistantly settle along test specimen circumferencial direction, in loading procedure, the compress variation of test specimen interlude falls in the measurement range of shaft position sensor, and the axial deflection of test specimen interlude is the mean value that three shaft position sensors record compression deformation.
2. stabilized with inorganic binder material uniaxial compression elasticity modulus test method according to claim 1, is characterized in that, in loading procedure, from starting to last the maximum force reaching test specimen and can bear for 30 ~ 60 seconds loading.
3. stabilized with inorganic binder material uniaxial compression elasticity modulus test method according to claim 1, is characterized in that, described fixture is formed primarily of stiffening ring, bolt and detachable screw rod,
Two stiffening rings are fixed on test specimen side interlude respectively by bolt, and detachable screw rod is arranged between two stiffening rings, for determining two stiffening ring initial separation.
4. stabilized with inorganic binder material uniaxial compression elasticity modulus test method according to claim 3, it is characterized in that, the initial separation of two stiffening rings is 0.45 ~ 0.5 times of height of specimen.
5. stabilized with inorganic binder material uniaxial compression elasticity modulus test method according to claim 1, is characterized in that, the axial deformation of adopt microcomputer automatically to record in loading procedure load that test specimen bears every 0.001s after starting to load and generation.
6. stabilized with inorganic binder material uniaxial compression elasticity modulus test method according to claim 1, is characterized in that, determine its elastic mould value by stress and strain during 0.25 ~ 0.35 maximum force.
7. stabilized with inorganic binder material uniaxial compression elasticity modulus test method according to claim 1, it is characterized in that, the diameter of described right cylinder test specimen is 1:1.2 ~ 1:1.8 with the ratio of height, and test specimen diameter is 100mm ~ 150mm.
8. stabilized with inorganic binder material uniaxial compression elasticity modulus test method according to claim 7, it is characterized in that, indoor employing vibration or hydrostatic profile right cylinder test specimen, right cylinder test specimen is prepared by boring core in scene, and right cylinder test specimen should meet design strength requirement.
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| CN110455621B (en) * | 2019-08-06 | 2022-03-22 | 深圳市市政工程总公司 | Method for testing compressive strength of building waste mixture with stable inorganic binder |
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