CN102226745A - Method and device for testing dynamic shear properties of aggregate-mortar transition region - Google Patents
Method and device for testing dynamic shear properties of aggregate-mortar transition region Download PDFInfo
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Abstract
The invention discloses a method for testing dynamic shear properties of an aggregate-mortar transition region. The test method comprises the following steps of A, manufacturing a test piece divided into two parts of an aggregate part and a cement mortar part along the axial direction, B, applying an axial load to the test piece, applying shear loads to the test piece and measuring corresponding shear displacements simultaneously, and drawing a shear load-shear displacement curve of an aggregate-mortar interfacial layer of the test piece according to the shear loads and the corresponding shear displacements, wherein the shear displacements occur under the axial load, C, adjusting a value of the axial load and repeating the step B to obtain shear bearing capacities under different axial loads, and D, drawing a shear bearing strength line, wherein axial loads are utilized as abscissa values; shear bearing capacities are utilized as ordinate values; an included angle of the shear bearing strength line and its abscissa axis is equal to an internal friction angle of the aggregate-mortar interfacial layer; and the ordinate axis intercept is equal to a cohesive force of the aggregate-mortar interfacial layer. The invention also discloses a device for testing dynamic shear properties of an aggregate-mortar transition region. Through the invention, dynamic shear mechanical properties of a concrete interfacial layer under different strain rates can be determined accurately.
Description
Technical field
The present invention relates to a kind of test method and test unit, relate in particular to a kind of aggregate-mortar zone of transition (being contact bed) dynamic shearing method for testing performance and test unit, be used for research concrete interface layer performance.
Background technology
Concrete is a kind of heterogeneous body heterogeneous composite material, and its macro-mechanical property depends on the material behavior and the interaction of each component of thin sight (aggregate, mortar, contact bed), and wherein contact bed is particularly evident to the influence of xoncrete structure macro-mechanical property.According to the influence of contact bed to the concrete macro-mechanical property, the research to the contact bed performance both at home and abroad mainly is divided into tensile property and cutting performance two classes, and corresponding material test is respectively tension test and shear test.The prism test specimen of aggregate, two ends mortar in the middle of tension test is adopted usually, measure the contact bed tensile property by applying axial tension, shear test then usually the employing center place aggregate, two ends are the cylindrical of mortar or prism test specimen, by exerting pressure correlation parameters such as aggregate " release " test specimen and then mensuration contact bed shear resistances.
Common contact bed experimental study at present focuses mostly in tension test, dabbles less to the research of cutting performance.The mensuration of contact bed cohesive force, angle of friction has been ignored in existing shear test research again researchs of paying close attention to shear resistance, elastic modulus more, and is especially more rare to the research of contact bed dynamic perfromance.Therefore can't carefully see Study on Numerical Simulation for concrete provides a whole set of reasonable, practical contact bed constitutive model, also can't be for providing reliable test support from thin sight level exploration mechanical performance of concrete, failure mechanism.In addition, because the complicacy of contact bed test and to the high request of test specimen, test unit also not have the contact bed testing shear performance research method of seeking unity of standard at present.Therefore, research and develop a kind of test unit and the test method that can accurately measure concrete interface layer moving shearing mechanical property under different strain rate, for all-round exploration concrete destruction mechanism, the realization concrete is carefully seen numerical simulation, and the contact bed testing program of formulating standard is of great practical significance.
Summary of the invention
Technical matters to be solved by this invention is to overcome the deficiency of existing concrete aggregate-mortar zone of transition test method, provides a kind of and can accurately measure concrete interface layer moving test method and corresponding test unit of shearing mechanical property under different strain rate.
Aggregate of the present invention-mortar zone of transition dynamic shearing method for testing performance may further comprise the steps:
Steps A, making test specimen, described test specimen is cylindrical, is divided into aggregate and sand-cement slurry two parts vertically, the aggregate part is directly got core from rock, carry out maintenance then at one end casting cement mortar, and according to the concrete standard curing condition;
Step B, utilize piece fixture that the part of test specimen is clamped, make the axial horizontal fixed of test specimen, another part of test specimen is unsettled;
Step C, test specimen is applied xial feed, after making xial feed reach a fixed value, overhanging portion to test specimen applies perpendicular to the axial shear load of test specimen, adjust shear load and measure the shear displacemant of corresponding test specimen simultaneously, draw this fixedly aggregate-mortar interface layer shear load-shear displacemant curve under the xial feed according to the shear-type load that obtains and corresponding shear displacemant, the shear load peak value in the curve is this fixedly shear-carrying capacity under the xial feed;
The value of step D, adjustment xial feed, and repeat above-mentioned steps C, obtain the shear-carrying capacity under the different xial feeds; With the xial feed is horizontal ordinate, and shear-carrying capacity is that ordinate is drawn the shearing strength line; The angle of gained shearing strength line and horizontal ordinate is the angle of internal friction of aggregate-mortar interface layer, and the intercept of shearing strength line on axis of ordinates is the cohesive strength of aggregate-mortar interface layer.
Further, also comprise after the described step D,
The loading speed of step e, adjustment shear load, repeating said steps B-step D obtains aggregate under the different loading speeds-shear-carrying capacity of mortar interface layer, cohesive strength, angle of internal friction.And then can study the Changing Pattern of aggregate-mortar interface layer cutting performance with loading speed.
In order to implement test method of the present invention, the invention allows for a kind of test unit, this device comprise test platform,
First reaction frame, second reaction frame, test specimen bearing, piece fixture, lifting jack, pressure transducer, shear displacemant measurement mechanism and load testing machine; Described first reaction frame, second reaction frame are H shaped steel frame structure, are fixed on the test platform; Described test specimen bearing is fixed in test platform, and its top has semicircle opening, and the size of semicircle opening and the size of test specimen adapt, and the test specimen bearing is perpendicular to the width of its semicircle opening direction length less than test specimen aggregate part; Described piece fixture is the inverted T-shaped structure, its underpart has semicircle opening, the size of semicircle opening and the size of test specimen adapt, piece fixture is perpendicular to the width of its semicircle opening direction length less than test specimen aggregate part, the piece fixture two ends have screw, can fix by thru-bolt and test platform.
The loading head of common load testing machine is generally tack, when directly cylinder specimen being applied shear load with loading head, and the load skewness.For shear load is evenly distributed on the test specimen, test unit of the present invention also comprises the loading cutter, and described loading cutter upper end is dull and stereotyped, and the lower end has semicircle opening, and the size of semicircle opening and the size of test specimen adapt.
In order to improve the measuring accuracy of shear displacemant, the shear displacemant measurement mechanism that the present invention adopts is two identical displacement meters, is positioned over dull and stereotyped two ends, described loading cutter upper end during test respectively.
When test specimen is applied xial feed, first reaction frame, second reaction frame since the level that is subjected to test specimen and lifting jack respectively to power, can produce slight deformation, may influence test accuracy.For improving test accuracy, both along continuous straight runs can be rigidly fixed connection.For example, girder steel that can between weld horizontal direction, perhaps with the long bolt that passes both with both levels to fixing.A horizontal restraint can be provided like this, prevent the reaction frame stress deformation.
For xial feed is evenly distributed on the test specimen, thus further lifting test precision, this device also comprises a load plate, its area places during test between test specimen and the described pressure transducer greater than the area of test specimen end face.
Test method of the present invention can accurately be measured shear-carrying capacity, cohesive strength and the angle of internal friction of aggregate-mortar interface layer, and is significant for the research of the dynamic shearing performance of aggregate-mortar interface layer.Test unit of the present invention is simple in structure, measuring accuracy is high, and can weighted platform as test platform, further be reduced cost in conjunction with the load testing machine of existing band weighted platform.
Description of drawings
Fig. 1 is the structural representation of aggregate of the present invention-mortar zone of transition dynamic shearing performance test apparatus;
Fig. 2 is for loading the structural representation of cutter;
Fig. 3 is the structural representation of piece fixture;
Fig. 4 is the structural representation of test specimen bearing;
Fig. 5 is the shear load-shear displacemant curve of aggregate-mortar interface layer;
Fig. 6 is the shearing strength line of aggregate-mortar interface layer.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated:
Test unit of the present invention as shown in Figure 1, comprise test platform 1, first reaction frame 2, second reaction frame 3, test specimen bearing 4, piece fixture 5, lifting jack 6, pressure transducer 7,, load testing machine 8, load cutter 9, load plate 10, shear displacemant measurement mechanism 11, sensor anchor clamps 12, lifting jack anchor clamps 13;
Wherein first reaction frame 2 and second reaction frame 3 are H shaped steel frame structure, be fixed on the test platform 1 by the thru-bolt that runs through the steel frame construction middle part, respectively have two screws symmetrically on second reaction frame 3 and first reaction frame 2, both can rigidly fix connection by the screw rod along continuous straight runs.
Test specimen bearing 4 by bolt on test platform 1, its structure as shown in Figure 4, top has semicircle opening, and the size of semicircle opening and the size of test specimen adapt, and test specimen bearing 4 is perpendicular to the width of its semicircle opening direction length less than test specimen aggregate part;
Piece fixture 5 as shown in Figure 3, integral body is the inverted T-shaped structure, its underpart has semicircle opening, the size of semicircle opening and the size of test specimen adapt, piece fixture 5 is perpendicular to the width of its semicircle opening direction length less than test specimen aggregate part, piece fixture 5 two ends have screw, can fix by thru-bolt and test platform;
Load testing machine 8 adopts the MTS load testing machine that has weighted platform, and this testing machine can be regulated loading speed easily, and can be with its weighted platform directly as test platform 1;
Load cutter 9 and can be fixed on the loading head of load testing machine 8, its structure as shown in Figure 2, the lower end has semicircle opening, the size of semicircle opening and the size of test specimen adapt;
Shear displacemant measurement mechanism 11 adopts two identical high precision LVDT(Linear Variable Differential Transformer, linear variable difference transformer), be positioned over dull and stereotyped two ends, described loading cutter upper end during test respectively;
For the warranty test precision, lifting jack 6 and pressure transducer 7 are fixed on the test platform 1 by lifting jack anchor clamps 13, sensor anchor clamps 12 respectively, the size of anchor clamps 13,12 can be according to the size design of lifting jack and pressure transducer, to guarantee lifting jack 6 and the axis of pressure transducer 7 and the axial alignment of test specimen.
When using said apparatus to carry out aggregate-mortar zone of transition dynamic shearing performance test, according to following steps:
The concrete sample that contains aggregate-mortar interface layer that step 1, preparation Pass Test require, described test specimen is cylindrical, be divided into aggregate and sand-cement slurry two parts vertically, the aggregate part is directly got core from rock, carry out the cutting of two ends end faces tie the back aggregate one end fixedly the mortar casting mold pour into a mould mortar, the concrete standard curing condition of maintenance reference of test specimen: temperature is controlled at 20 ± 3 ℃, and relative humidity is more than 95%.Prepared test specimen one end mortar, an end aggregate, two-part intersection is aggregate-mortar zone of transition.
Step 2, as shown in Figure 1, by piece fixture 5 and test specimen bearing 4 concrete sample is fixed on the test platform 1, the aggregate of test specimen-mortar zone of transition should be aimed at the edge of test specimen bearing 4, place lifting jack 6 and pressure transducer 7 at test specimen one end then, lifting jack 6 and pressure transducer 7 are fixed on the test platform 1 by lifting jack anchor clamps 13, sensor anchor clamps 12 respectively, to guarantee lifting jack 6 and the axis of pressure transducer 7 and the axial alignment of test specimen.
Step 4, make an end of lifting jack 6 prop up second reaction frame 3, apply then and carry an xial feed, should guarantee that reaction frame 2,3, lifting jack 6, pressure transducer 7 and test specimen fully contact.
Step 5,6 pairs of test specimens of use lifting jack apply xial feed, and the loaded value by pressure transducer 7 control xial feeds should remain load plate 10 vertically to avoid test specimen inhomogeneous stressed in loading procedure.
Step 6, after xial feed reaches design load, will load cutter 9 and be positioned over the two-part intersection of test specimen, the loading head that puts down load testing machine 8 makes it and loads cutter 9 top plane contact; Apply certain preload earlier to eliminate the gap between each several part, the shear displacemant measurement mechanism is installed then, two LVDT are positioned over the top, two ends that loads cutter 9 respectively, the mean value of getting the shift value that two LVDT record during test is as shear displacemant, it is bigger than normal to eliminate a side displacement that is caused when loading the cutter inclination like this, the situation that a lateral deviation is little.
Shear-type load and corresponding shear displacemant that step 8, basis obtain are drawn fixedly xial feed
Under aggregate-mortar interface layer shear load-shear displacemant curve, the curve that obtains as shown in Figure 5, horizontal ordinate among the figure
Be shear displacemant, ordinate
Be shear load, the shear load peak value in the curve
Be this fixedly xial feed
Under shear-carrying capacity;
The value of step 9, adjustment xial feed, and repeat above-mentioned steps 8, obtain the shear-carrying capacity under the different xial feeds; With xial feed
Be horizontal ordinate, shear-carrying capacity
For ordinate is drawn the shearing strength line; Gained shearing strength line
As shown in Figure 6, the angle of shearing strength line and horizontal ordinate
Be the angle of internal friction of aggregate-mortar interface layer, the intercept of shearing strength line on axis of ordinates is the cohesive strength of aggregate-mortar interface layer
Claims (9)
1. aggregate-mortar zone of transition dynamic shearing method for testing performance is characterized in that, may further comprise the steps:
Steps A, making test specimen, described test specimen is cylindrical, is divided into aggregate and sand-cement slurry two parts vertically, the aggregate part is directly got core from rock, carry out maintenance then at one end casting cement mortar, and according to the concrete standard curing condition;
Step B, utilize piece fixture that the aggregate of test specimen is partly clamped, make the axial horizontal fixed of test specimen, the mortar part of test specimen is unsettled;
Step C, test specimen is applied xial feed, after making xial feed reach a fixed value, overhanging portion to test specimen applies perpendicular to the axial shear load of test specimen, adjust shear load and measure the shear displacemant of corresponding test specimen simultaneously, draw this fixedly aggregate-mortar interface layer shear load-shear displacemant curve under the xial feed according to the shear-type load that obtains and corresponding shear displacemant, the shear load peak value in the curve is this fixedly shear-carrying capacity under the xial feed;
The value of step D, adjustment xial feed, and repeat above-mentioned steps C, obtain the shear-carrying capacity under the different xial feeds; With the xial feed is horizontal ordinate, and shear-carrying capacity is that ordinate is drawn the shearing strength line; The angle of gained shearing strength line and horizontal ordinate is the angle of internal friction of aggregate-mortar interface layer, and the intercept of shearing strength line on axis of ordinates is the cohesive strength of aggregate-mortar interface layer.
2. aggregate-mortar zone of transition dynamic shearing method for testing performance according to claim 1 is characterized in that, also comprise after the described step D,
The loading speed of step e, adjustment shear load, repeating said steps B-step D obtains aggregate under the different loading speeds-shear-carrying capacity of mortar interface layer, cohesive strength, angle of internal friction.
3. aggregate-mortar zone of transition dynamic shearing performance test apparatus, it is characterized in that this device comprises test platform, first reaction frame, second reaction frame, test specimen bearing, piece fixture, lifting jack, pressure transducer, shear displacemant measurement mechanism and load testing machine; Described first reaction frame, second reaction frame are H shaped steel frame structure, are fixed on the test platform; Described test specimen bearing is fixed in test platform, and its top has semicircle opening, and the size of semicircle opening and the size of test specimen adapt, and the test specimen bearing is perpendicular to the width of its semicircle opening direction length less than test specimen aggregate part; Described piece fixture is the inverted T-shaped structure, its underpart has semicircle opening, the size of semicircle opening and the size of test specimen adapt, piece fixture is perpendicular to the width of its semicircle opening direction length less than test specimen aggregate part, the piece fixture two ends have screw, can fix by thru-bolt and test platform.
4. as aggregate-mortar zone of transition dynamic shearing performance test apparatus as described in the claim 3, it is characterized in that this device also comprises the loading cutter, described loading cutter upper end is dull and stereotyped, the lower end has semicircle opening, and the size of semicircle opening and the size of test specimen adapt.
5. as aggregate-mortar zone of transition dynamic shearing performance test apparatus as described in the claim 4, it is characterized in that described shear displacemant measurement mechanism is two identical displacement meters, be positioned over dull and stereotyped two ends, described loading cutter upper end during test respectively.
6. as aggregate-mortar zone of transition dynamic shearing performance test apparatus as described in the claim 3, it is characterized in that described second reaction frame rigidly fixes with the first reaction frame along continuous straight runs and is connected.
7. as aggregate-mortar zone of transition dynamic shearing performance test apparatus as described in the claim 6, it is characterized in that, have screw symmetrically on second reaction frame and first reaction frame, rigidly fix connection by the long bolt along continuous straight runs between the two.
8. as aggregate-mortar zone of transition dynamic shearing performance test apparatus as described in the claim 3, it is characterized in that this device also comprises a load plate, its area places during test between test specimen and the described pressure transducer greater than the area of test specimen end face.
9. as aggregate-mortar zone of transition dynamic shearing performance test apparatus as described in the claim 3, it is characterized in that described load testing machine has weighted platform, described test platform is the weighted platform of load testing machine.
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| CN110031337A (en) * | 2019-04-28 | 2019-07-19 | 南京林业大学 | Roadbed filling and Earthworking reinforced bar interface mechanics characteristic detecting apparatus and measuring method |
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| CN110376031A (en) * | 2019-07-06 | 2019-10-25 | 天津大学 | A kind of test method at simulation coarse aggregate-mortar reduction interface |
| CN113111563A (en) * | 2021-05-21 | 2021-07-13 | 郑州大学 | Method for evaluating adhesive property of interface between geopolymer mortar and concrete |
| CN113111563B (en) * | 2021-05-21 | 2023-02-24 | 郑州大学 | Method for evaluating adhesive property of interface between geopolymer mortar and concrete |
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Application publication date: 20111026 |