CN101387634A - Uniaxial tension loading unit for testing concrete carbonizing performance under tensile stress and testing method - Google Patents
Uniaxial tension loading unit for testing concrete carbonizing performance under tensile stress and testing method Download PDFInfo
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- CN101387634A CN101387634A CNA2008101558931A CN200810155893A CN101387634A CN 101387634 A CN101387634 A CN 101387634A CN A2008101558931 A CNA2008101558931 A CN A2008101558931A CN 200810155893 A CN200810155893 A CN 200810155893A CN 101387634 A CN101387634 A CN 101387634A
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Abstract
The invention discloses a single shaft tension loading device for testing the carbonation property of the concrete under tensile stress and a test method, wherein the hex nuts pre-embedded at the axis of two ends of the tested element connect the cylinder or rectangle tested element between two parallel steel plates, four same compressed springs are sheathed on four steel columns of the diameters smaller than the inner diameter of the springs, the two steel plates can parallel move between the four steel columns, the material parameters and the compressed quantity of the springs can be used to calculate the axial tensile load on the tested element, the tested element is axially patched with three stress sheets to find the actual tensile stress at different parts. The characteristic parameters of the springs can be changed to obtain the carbonation test parameters under different tensile stresses.
Description
Technical field
The present invention relates to a kind of concrete carbonizing performance method of testing and charger thereof, particularly a kind ofly can make the concrete sample that is under the continuous uniaxial tension state carry out the performance test and the test unit thereof of testing laboratory's accelerated carbonation under the different tensile stress level conditions.
Background technology
Concrete is the material of inadequate natural endowment band crack work, and the Study on Deformation of its microcosmic under action of compressive stress and microscopical structure is a lot, but fine sight structural change The Characteristics is relatively limited under the drawing stress effect.At present, the research of the tension that concrete sample is applied mainly is to realize by the device of bending stress, and simple uniaxial tension charger does not also have relevant report.A key reason is exactly to realize that the difficulty of concrete uniaxial tension state is bigger, and uniaxial tension stress and carbonization are carried out coupling test, because complicated just more difficult realization of charger, so the research of this respect rarely has report especially.
Summary of the invention
The shortcoming following to the lasting maintenance of concrete sample uniaxial tension state and that carbonization test is coupled that is difficult at the prior art existence, the invention provides the uniaxial tension method of testing and the charger thereof of concrete carbonizing performance under a kind of tension, can make concrete sample under lasting uniaxial tension state, test the carbonization Changing Pattern and influence mechanism.
Technical scheme of the present invention is: the uniaxial tension charger of concrete carbonizing performance under a kind of tension, described device is made up of two block plates up and down, four jiaos of places at two block plates respectively are provided with a hole, the steel pipe that is provided with screw thread by four radicles interconnects upper steel plate and lower steel plate, last lower steel plate can prolong the steel pipe parallel sliding, also be with four springs with same characteristic features parameter on bolt upper steel plate and lower steel plate are separated, steel pipe cooperates the fixation steel plate position with nut; The pre-embedded bolt that is provided with a hole and concrete sample two ends at the place, axis of two steel plates up and down respectively cooperatively interacts, and pre-embedded bolt is fixed by nut and last lower steel plate.
Use the method for testing of the uniaxial tension charger test concrete pulling stress of concrete carbonizing performance under described a kind of tension, step is:
The first step is made concrete sample, during moulding pre-embedded bolt is imbedded the central axis at concrete sample two ends, and length of embedment is 4.0-5.0cm;
Second step, the concrete sample that makes is loaded on the uniaxial tension charger, spring is exerted pressure, tighten the nut on the steel column on four jiaos of the upper steel plates, two surfaces up and down of lower steel plate and concrete sample are contacted, and the pre-embedded bolt by the concrete sample two ends is fixed on concrete sample between the lower steel plate;
The 3rd step, on the axial direction of the middle part of concrete sample, stick three foil gauges, then electric wire strain gauge is received on the foil gauge of concrete sample, the electric wire strain gauge zeroing, nut on four steel pipes on four jiaos of the uniaxial tension chargers is unscrewed, after a period of stabilisation, read the strain value of this moment;
The 4th goes on foot, and whole charger is put into carried out carbonization in the accelerated carbonation case, and in the carbonization length of time that is required by different tests to determine, 1/3rd usefulness epoxy resin on test specimen surface are sealed, until reaching the carbonization length of time that experiment is set;
The 5th step, take out charger, change one group of spring again, repeated test step then with different characteristic parameter.Described concrete sample is right cylinder or long cube.When concrete sample is rectangular parallelepiped, the both ends of the surface up and down of rectangular parallelepiped and two opposite epoxy sealings wherein.
Cardinal principle: according to the Hooke's law principle, make the system of being spring-loaded, load by spring to the test specimen load application.Measure spring rate earlier, control the size of tension by the compress variation of control spring.By the pre-embedded bolt at two ends, concrete sample axis right cylinder or cuboid concrete sample are connected between two sections parallel steel plates, the upper and lower surface of last lower steel plate and concrete sample closely contacts.Four compression springs with same characteristic features parameter are enclosed within four diameters slightly than on the little steel column of spring inside diameter, in the time of test, the nut of bolt on four jiaos of two block plates is unscrewed, this moment, at this moment compressed four springs just began to continue to two block plate load applications because concrete sample has been fixed in up and down between two block plates by pre-embedded bolt.Decrement according to spring material parameter and spring can calculate the axial tension load that acts on the test specimen, adopts this method load application, and stress relaxation is to the almost not influence of test specimen load-bearing in the experimentation.As long as change the spring on four columns of angles, just can apply different load.In order to determine the actual tension of test specimen different parts, paste three foil gauges at the concrete sample axial direction, can determine the tension that test specimen is subjected to according to the strain value under the different pulling force effects.
Beneficial effect: 1. can make concrete be in lasting uniaxial tension state.According to Hooke's law, when spring reduced from compressive state, the screen resilience and the compress variation that are provided were directly proportional, so the present invention can make concrete be in lasting uniaxial tension state when experiment.
2. the tension of different stress levels can be provided, thus the purpose that realization is estimated the anti-carbonization permanance of xoncrete structure under the tension coupling.As long as change the spring of the parameter that takes on a different character simultaneously, just can provide the tension of different stress levels.
3. easy to operate.Simple in structure, easy to operate.
4. adopt device load application of the present invention, stress relaxation is to almost not influence of test specimen in the experimentation.
5. by the foil gauge on the test specimen, can determine the actual tension of test specimen different parts.
Description of drawings
Fig. 1 is a concrete in uniaxial tensile loading device front view.
Wherein 1. steel columns, 2. steel column nut, 3. spring, 4. steel plate, 5. test specimen, 6. pre-embedded bolt, 7. nut
Fig. 2 is a concrete in uniaxial tensile loading device vertical view.
Embodiment
Embodiment 1
The first step adopts circular pvc pipe, and length is 300mm, and the diameter of pipe is 100mm, as the cover die of making concrete cylindrical shape test specimen; During moulding pre-embedded bolt is imbedded the central shaft position at test specimen two ends, length of embedment is 4cm.The mode moulding that concrete adopts layering to vibrate, moulding form removal after a day, maintenance was taken out after testing requirements length of time.
Second step, four steel pipes are inserted in four holes at four jiaos of places of lower steel plate, and it is four springs with same characteristic features parameter are placed on it, the cylinder bodily form concrete sample that makes is placed on the lower steel plate, allow the pre-embedded bolt of lower surface of concrete sample from the hole of lower steel plate axis, pass, and then with putting upper steel plate, spring is exerted pressure makes upper steel plate closely contact with the upper surface of test specimen, tightens the nut on four jiaos the steel column.Tighten the nut on the pre-embedded bolt at concrete sample two ends, be fixed between lower steel plate.
The 3rd step, on the axial direction of the middle part of concrete sample, stick three foil gauges, then electric wire strain gauge is received on the foil gauge of concrete sample, the electric wire strain gauge zeroing, nut on outside four steel columns is unscrewed, the spring that compress this moment begins resilience, the pressure of continuing for last lower steel plate, and pressure is given the continual axial tension stress of test specimen by the pre-embedded bolt that is embedded in two ends, test specimen center.After a period of stabilisation, read the strain value of this moment.
The 4th step, whole charger put into carry out carbonization in the accelerated carbonation case, and in the carbonization length of time of necessarily determining by the different tests purpose, / 3rd usefulness epoxy resin of test specimen outside surface are sealed, before reaching whole carbonization length of time of expection, test specimen is placed on carbonization in the carbonization case always, continues carbonization, until the whole carbonization length of time that reaches expection.
The 5th step, take out charger, change one group of spring again, the repeated test step, just concrete sample is loaded on the uniaxial tension charger, spring is exerted pressure, tighten the nut on the steel column on four jiaos of the upper steel plates, lower steel plate is contacted with the upper and lower surface of concrete sample, by the pre-embedded bolt that mixes your his test specimen two ends concrete sample is fixed and gone up between the lower steel plate again; Then electric wire strain gauge is received on the foil gauge of concrete sample, the nut on four jiaos of the uniaxial tension chargers is unscrewed in electric wire strain gauge zeroing, stable after, read the strain value of this moment; Whole charger put into carry out carbonization in the accelerated carbonation case,, test by testing requirements.By adjust changing spring, just can measure under the different tensions single shaft tensile load to the influence of concrete anti-carbonation properties with different characteristic parameter.
Embodiment 2
The first step adopts 100 * 100 * 300 cube three gang mould tool moulding rectangular parallelepiped test specimens.During moulding pre-embedded bolt is imbedded the central shaft position at test specimen two ends, length of embedment is 7cm.The mode moulding that concrete adopts layering to vibrate, moulding form removal after a day, maintenance was taken out after the length of time of testing requirements, and curing age is to determine according to different tests.With two opposites of rectangular parallelepiped test specimen and up and down two end faces shut with epoxy resin, only stay two opposites.
Second step, as depicted in figs. 1 and 2, four steel pipes are inserted in four holes at four jiaos of places of lower steel plate, and it is four springs with same characteristic features parameter are placed on it, the cuboid concrete sample that makes is placed on the lower steel plate, allow the pre-embedded bolt of lower surface of concrete sample from the hole of lower steel plate axis, pass, and then with putting upper steel plate, spring exerted pressure makes upper steel plate closely contact with the upper surface of test specimen, tightens the nut on four jiaos the steel column.Tighten the nut on the pre-embedded bolt at concrete sample two ends, be fixed between lower steel plate.
The 3rd step, on the axial direction of the middle part of concrete sample, stick three foil gauges, then electric wire strain gauge is received on the foil gauge of concrete sample, the electric wire strain gauge zeroing, nut on outside four steel columns is unscrewed, the spring that compress this moment begins resilience, the pressure of continuing for last lower steel plate, and pressure is given the continual axial tension stress of test specimen by the pre-embedded bolt that is embedded in two ends, test specimen center.After a period of stabilisation, read the strain value of this moment.
In the 4th step, whole charger put into carry out carbonization in the accelerated carbonation case, and, 1/3rd usefulness epoxy resin of test specimen outside surface are sealed, until the whole carbonization length of time that reaches expection in certain carbonization length of time of determining by the different tests purpose.
The 5th step, take out charger, change one group of spring again, repeated test step then.By adjust changing spring, just can measure under the different tensions single shaft tensile load to the influence of concrete anti-carbonation properties with different characteristic parameter.
Claims (4)
1. the uniaxial tension charger of concrete carbonizing performance under the tension, it is characterized in that described device is made up of two block plates up and down, four jiaos of places at two block plates respectively are provided with a hole, the steel pipe that is provided with screw thread by four radicles interconnects upper steel plate and lower steel plate, last lower steel plate can prolong the steel pipe parallel sliding, also be with four springs with same characteristic features parameter on bolt upper steel plate and lower steel plate are separated, steel pipe cooperates the fixation steel plate position with nut; The pre-embedded bolt that is provided with a hole and concrete sample two ends at the place, axis of two steel plates up and down respectively cooperatively interacts, and pre-embedded bolt is fixed by nut and last lower steel plate.
2. application rights requires the method for testing of the uniaxial tension charger test concrete pulling stress of concrete carbonizing performance under 1 described a kind of tension, it is characterized in that step is:
The first step is made concrete sample, during moulding pre-embedded bolt is imbedded the central axis at concrete sample two ends, and length of embedment is 4.0-5.0cm;
Second step, the concrete sample that makes is loaded on the uniaxial tension charger, spring is exerted pressure, tighten the nut on the steel column on four jiaos of the upper steel plates, two surfaces up and down of lower steel plate and concrete sample are contacted, and the pre-embedded bolt by the concrete sample two ends is fixed on concrete sample between the lower steel plate;
The 3rd step, on the axial direction of the middle part of concrete sample, stick three foil gauges, then electric wire strain gauge is received on the foil gauge of concrete sample, the electric wire strain gauge zeroing, nut on four steel pipes on four jiaos of the uniaxial tension chargers is unscrewed, after a period of stabilisation, read the strain value of this moment;
The 4th goes on foot, and whole charger is put into carried out carbonization in the accelerated carbonation case, and in the carbonization length of time that is required by different tests to determine, 1/3rd usefulness epoxy resin on test specimen surface are sealed, until reaching the carbonization length of time that experiment is set;
The 5th step, take out charger, change one group of spring again, repeated test step then with different characteristic parameter.
3. the method for testing of the uniaxial tension charger of concrete carbonizing performance test concrete pulling stress is characterized in that described concrete sample is right cylinder or long cube under a kind of tension as claimed in claim 2.
4. the method for testing of the uniaxial tension charger of concrete carbonizing performance test concrete pulling stress under a kind of tension as claimed in claim 3, it is characterized in that when concrete sample is rectangular parallelepiped the both ends of the surface up and down of rectangular parallelepiped and two opposite epoxy sealings wherein.
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