CN203259386U - Apparatus for making natural cracks of concrete test piece - Google Patents
Apparatus for making natural cracks of concrete test piece Download PDFInfo
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- CN203259386U CN203259386U CN 201320124126 CN201320124126U CN203259386U CN 203259386 U CN203259386 U CN 203259386U CN 201320124126 CN201320124126 CN 201320124126 CN 201320124126 U CN201320124126 U CN 201320124126U CN 203259386 U CN203259386 U CN 203259386U
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- 239000004567 concrete Substances 0.000 title claims abstract description 142
- 238000012360 testing method Methods 0.000 title claims abstract description 65
- 238000011068 loading method Methods 0.000 claims abstract description 50
- 239000002184 metal Substances 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 8
- 239000011888 foil Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 7
- 238000011160 research Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000035882 stress Effects 0.000 description 17
- 238000005336 cracking Methods 0.000 description 13
- 230000009429 distress Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to an apparatus for making the natural cracks of a concrete test piece, and aims at providing an apparatus for accurately controlling the widths of the concrete cracks according to test requirements. The apparatus for making the natural cracks of the concrete test piece comprises a concrete test pre-stress loading system, a concrete crack expansion control system and a test system. The apparatus can stably stimulate the crack developing process on the concrete test piece, and can accurately control the widths of the cracks of the concrete test piece according to the test requirements. The apparatus has the advantages of simplicity, simple operation, low price and maintaining convenience, can be widely used for making crack concrete test pieces, and provides a test basis for the researches on the durability and service performances of crack concrete.
Description
Technical field
The utility model is the device about making concrete sample dry, particularly a kind of device that can accurately control according to the requirement of test concrete crack width.
Background technology
Concrete is one of building materials the most frequently used in the modern construction engineering, improves the military service performance of concrete material to having very important significance the serviceable life of improving building structure.At present, be the focus of civil engineering work research to the theoretical and experimental investigations of concrete material permanance.But, present research is mostly for intact xoncrete structure, and is at present also fewer for the research of the xoncrete structure behind the cracking and material, and in fact, xoncrete structure the non-stress crack that the reasons such as Yin Wendu, contraction cause just occurs easily in the construction stage.In operational phase, owing to reasons such as load actions, also stressed crack can appear, so most xoncrete structure in fact all is work with cracking.Therefore, in the concrete material experimental study, mechanical property and the permanance of studying concrete material under the cracking state by the concrete sample in default crack have very important significance to the service life of predicting xoncrete structure.
The heterogeneous composite material that concrete is comprised of aggregate, mortar and interface, and also exist a certain amount of hole defective in the maturing.Various material components and the defective stochastic distribution in concrete also causes the crack growth path of distress in concrete to have randomness, simultaneously, under load action, there is a micro-crack district in the distress in concrete tip location, and does not all have load action in the fracture area in the concrete.Present theoretical research shows, the most advanced and sophisticated micro-crack of distress in concrete district, crack tortuosity, sides of fracture surface roughness and concrete are that the diffusion in cracked concrete has material impact to the aggressivity ion for load action in the fracture area.Therefore, study permanance and the military service performance of cracked concrete material, just must at first prepare the concrete sample with dry, but because concrete is a kind of hard brittle material, the brittle rupture that often causes concrete sample by simply applying the method for drawing load, can't effectively control the production process in crack in the concrete, also can't accurately control fracture width according to testing requirements.Therefore, common employing method of pre-buried certain thickness steel disc in concrete sample is copied the concrete sample with dry in the present experimental study, but the concrete sample of preparation can't reflect the concrete FRACTURE CHARACTERISTICS of natural cracking and the stress state of natural cracking inside concrete by this method.
The utility model content
Fundamental purpose of the present utility model is to overcome deficiency of the prior art, and a kind of novel and easy device that can make concrete sample dry is provided.For solving the problems of the technologies described above, solution of the present utility model is:
A kind of device of making concrete sample dry is provided, comprise concrete sample prestress loading system, concrete crack expansion control system and test macro, described concrete sample prestress loading system comprises that prestress loads steel plate, load nut, prestress loads screw rod, foil gauge and strain testing instrument, two prestress load steel plate and load the screw rod connection by prestress, and load nut and be located at the junction that prestress loads steel plate and prestress loading screw rod, strain gauge adhesion loads on the screw rod at prestress, and is connected with the strain testing instrument by wire; Described concrete crack expansion control system comprises I class pre-embedded bolt, control screw rod and the control nut that is embedded in the concrete sample bottom surface, two I class pre-embedded bolts connect by the control screw rod, and the control nut is located at the junction of I class pre-embedded bolt and control screw rod; Described test macro comprises two II class pre-embedded bolts, test screw rod, hold-doun nut and the digital dial gauge that is embedded in the concrete sample side, be fixed with the test screw rod by hold-doun nut on the II class pre-embedded bolt, be fixed with digital dial gauge by hold-doun nut on another II class pre-embedded bolt;
Described I class pre-embedded bolt comprises Metallic rod and nut, and described nut is welded on an end of Metallic rod, and the diameter of nut is greater than the diameter of control screw rod; Described II class pre-embedded bolt comprises Metallic rod A and metal cap, the end of Metallic rod A is provided with the hole of Metallic rod A vertical direction with along the screw of Metallic rod A direction, metal cap comprises Metallic rod B and metal screw, Metallic rod B and metal screw are welded and fixed, the diameter of Metallic rod B is greater than the diameter of metal screw, the diameter of metal screw is less than the upper screwhole diameter along Metallic rod A direction of Metallic rod A, and one section of metal screw is installed in Metallic rod A along in the screw of Metallic rod A direction.
As further improvement, the line of described two II class pre-embedded bolts is parallel with the concrete sample bottom surface.
As further improvement, described loading nut is used for loading the load that the position control prestress of nut on prestress loading screw rod loads screw rod by adjusting.
As further improvement, described control nut is used for by adjusting the width in the distance control concrete sample crack between two I class pre-embedded bolts.
As further improvement, the bore dia of described Metallic rod A vertical direction is greater than the diameter of digital dial gauge with the test screw rod.
As further improvement, described concrete sample and concrete sample prestress loading system are arranged on the loading tester, and loading tester is used for providing three point loading effects to concrete sample.
Principle of work of the present utility model is:
The utility model loads the position of nut on prestress loading screw rod by adjusting, control prestress loads the distance between the steel plate, concrete sample is applied press loading effect, make and produce initial compressive stress in the concrete, by the size of the load action in foil gauge and the strain testing instrument monitored concrete.
The utility model is placed in concrete sample and concrete sample prestress loading system on the loading tester, adopts 3 Loading Method to the effect of concrete sample load application.Because there is initial compressive stress in concrete sample inside, under 3 loading effects, the concrete of test specimen bottom will change tension state into gradually by pressured state, until cracking.Because the effect of initial compressive stress in the concrete, the cracking of distress in concrete and expansion process are all very slow, have effectively avoided the brittle cracking of concrete sample to destroy.When loading, by test macro, can accurately control the width of distress in concrete to satisfy the requirement of test.
The concrete crack expansion control system that the utility model is designed, control the width in crack by adjusting the control screw rod, guarantee that the width in cracked concrete crack can satisfy the requirement of test, and guarantee that the stress state of cracked concrete test specimen inside is identical with the stress state of the concrete sample inside of true cracking.Adopt the control nut will control the screw rod locking, the fracture width in the maintenance concrete sample and the stress state of test specimen inside are constant.
Compared with prior art, the beneficial effects of the utility model are:
The utility model can stably simulate the process of crack developing at concrete sample.Adopt the crack in the concrete sample of crack and true stressed cracking of cracked concrete test specimen of the utility model preparation to have identical profile and crack growth path, and the stress state in the cracked concrete test specimen is identical with stress state in the concrete sample of true stressed cracking, and has simultaneously crack tip micro-crack district, crack tortuosity and the sides of fracture surface roughness identical with the concrete sample of true stressed cracking.The more important thing is that the utility model can accurately be controlled according to the demand of test the crack width of cracked concrete test specimen.The utility model device is simple, and is easy and simple to handle, cheap, easy to maintenance, can be widely used in preparation cracked concrete test specimen, for permanance and the military service performance of studying cracked concrete provides experimental basis.
Description of drawings
Fig. 1 is positive elevational schematic view of the present utility model.
Fig. 2 is side elevation synoptic diagram of the present utility model.
Fig. 3 is the positive elevational schematic view of utilizing the utility model prefabricated crack on concrete sample.
Fig. 4 is the side elevation synoptic diagram that utilizes the utility model prefabricated crack on concrete sample.
Fig. 5 utilizes the utility model in the fixing positive elevational schematic view in crack of concrete sample.
Fig. 6 utilizes the utility model at the fixing side elevation synoptic diagram in crack of concrete sample.
Fig. 7 is the I class pre-embedded bolt vertical view in the utility model.
Fig. 8 is the I class pre-embedded bolt side view in the utility model.
Fig. 9 is the II class pre-embedded bolt Metallic rod A vertical view in the utility model.
Figure 10 is the II class pre-embedded bolt Metallic rod A side view in the utility model.
Figure 11 is the II class pre-embedded bolt metal cap synoptic diagram in the utility model.
Figure 12 is the II class pre-embedded bolt metal cap synoptic diagram in the utility model.
Figure 13 is the II class pre-embedded bolt synoptic diagram in the utility model.
Reference numeral among the figure is: 1 prestress loads steel plate; 2 load nut; 3 prestress load screw rod; 4 I class pre-embedded bolts; 5 control screw rods; 6 control nuts; 7 test screw rods; 8 II class pre-embedded bolts; 9 hold-doun nuts; 10 digital dial gauges; 11 foil gauges; 12 strain testing instrument; 13 testing machine loading heads; 14 bearings; 15 concrete samples; 16 distress in concretes.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
The device of the making concrete sample dry among Fig. 1, Fig. 2 comprises concrete sample prestress loading system, concrete crack expansion control system and test macro.Described concrete sample prestress loading system comprises that prestress loads steel plate 1, loading nut 2, prestress loading screw rod 3, foil gauge 11 and strain testing instrument 12, two prestress load steel plate 1 and load screw rod 3 connections by prestress, and load nut 2 and be located at the junction that prestress loads steel plate 1 and prestress loading screw rod 3, load the position of nut 2 on prestress loading screw rod 3 by adjusting, the concrete sample 15 that prestress is loaded between the steel plate 1 applies prefabricating load, thereby can adjust the initial compressive stress size of concrete sample 15 inner generations.Foil gauge 11 sticks on prestress and loads on the screw rod 3, and is connected with strain testing instrument 12 by wire.Described concrete crack expansion control system comprises I class pre-embedded bolt 4, control screw rod 5 and the control nut 6 that is embedded in concrete sample 15 bottom surfaces, two I class pre-embedded bolts 4 connect by control screw rod 5, and control nut 6 is located at the junction of I class pre-embedded bolt 4 and control screw rod 5, by the distance between two I class pre-embedded bolts 4 of control nut 6 adjustment, thus control distress in concrete 16 width.Described test macro comprises two II class pre-embedded bolts 8, test screw rod 7, hold-doun nut 9 and the digital dial gauge 10 that is embedded in concrete sample 15 sides, be fixed with test screw rod 7 by hold-doun nut 9 on the II class pre-embedded bolt 8, it is parallel with concrete sample 15 bottom surfaces to be fixed with the line of 10, two II classes of digital dial gauge pre-embedded bolt 8 by hold-doun nut 9 on another II class pre-embedded bolt 8.Test macro can be placed in differing heights position, concrete sample 15 side, thereby can measure according to testing requirements distress in concrete 16 width of concrete sample 15 differing heights positions.
Such as Fig. 7, shown in Figure 8, I class pre-embedded bolt 4 comprises Metallic rod and nut, and nut is welded on an end of Metallic rod, and the diameter of nut is a bit larger tham the diameter of controlling screw rod 5, and is supporting with the diameter of control screw rod 5.Extremely shown in Figure 13 such as Fig. 9, II class pre-embedded bolt 8 comprises Metallic rod A and metal cap, the end of Metallic rod A is provided with the hole of Metallic rod A vertical direction with along the screw of Metallic rod A direction, the bore dia of Metallic rod A vertical direction is convenient to install digital dial gauge 10 bars greater than the diameter of digital dial gauge 10 with test screw rod 7.Metal cap comprises Metallic rod B and metal screw, Metallic rod B and metal screw are welded and fixed, the diameter of Metallic rod B is greater than the diameter of metal screw, the diameter of metal screw is slightly smaller than the upper screwhole diameter along Metallic rod A direction of Metallic rod A, make metal screw diameter and screwhole diameter coupling, one section of metal screw is installed in Metallic rod A along in the screw of Metallic rod A direction.
When trial-production is standby; the 6mm that foil gauge 11 employing Huangyan testing tool factories produce * 4mm resistance strain gage; strain testing instrument 12 adopts the DN3815 type electric wire strain gauge of east, Jiangsu magnificent measuring technology incorporated company; the river board one-tenth amount digital display dial gauge that digital dial gauge 10 adopts fair, Guangzhou benefit Hardwear Pty Ltd. to produce, loading tester adopts the universal testing machine of the imperial 500kN of Shanghai China.The concrete sample 15 that the cracked concrete testing requirements is adopted is of a size of 75mm * 150mm * 400mm, and width prefabricated is the distress in concrete 16 of 0.80mm near concrete sample 15 span centres.The detailed process of cracked concrete test specimen 15 is as follows:
Load the position of nut 2 on prestress loading screw rod 3 by adjusting, control prestress loads the distance between the steel plate 1, and concrete sample 15 is applied press loading effect, makes and produces initial compressive stress in the concrete.Employing foil gauge 11 is monitored the strain deformation that applies prestress loading screw rod 3 in the prestress process with strain testing instrument 12, loads the load action size of stress-strain relation calculated prestressing force loading screw rod 3 inside of screw rod 3 by the prestress that records in advance.This time in the implementation process, the stress and strain pass that prestress loads screw rod 3 is:
ε?=?48.51?f?–?409.23；
In the formula: ε is that prestress loads screw rod strain, unit 10
-6F is that prestress loads the load in the screw rod 3, the kN of unit.
The compressive pre-stress of controlling in the concrete sample 15 by the load of analyzing in the prestress loading screw rod 3 is 3MPa, guarantees that the compressive stress in the concrete sample 15 is no more than concrete limit of elasticity value 20MPa in this enforcement.
As shown in Figure 3, Figure 4, concrete sample 15 and concrete sample prestress loading system are placed on the loading tester mounting test system on concrete sample 15 sides.Adopt 3 Loading Method to concrete sample 15 load application effects, and the loading velocity of control load, guarantee that generation and the expansion process of concrete sample 15 basal cracks is all very slow, effectively avoid the brittle cracking of concrete sample 15 to destroy.By test macro monitoring distress in concrete 16 width, when fracture width reached test design fracture width desired value 0.80mm, loading tester stopped to load and unloading.Concrete sample 15 and concrete sample prestress loading system are taken off from loading tester.
Such as Fig. 5, shown in Figure 6, concrete sample prestress loading system is removed from concrete sample 15.Install control screw rod 5 in concrete sample 15 bottoms, adopt control nut 6 to fix control screw rod 5 left ends, the distance by between two pre-embedded bolts of control nut 6 controls of adjusting control screw rod 5 right-hand members is opened the crack on the concrete sample 15 again.By the fracture width of test macro monitoring concrete sample 15, control screw rod 5 stops the rotation when fracture width reaches test design fracture width desired value 0.80mm.Adopt control nut 6 to fix control screw rod 5 right-hand members, thereby keep the width of distress in concrete 16 no longer to change.At this moment, the fracture width of cracked concrete test specimen 15 satisfies test design fracture width desired value 0.80mm, and the stress state of inside was identical when concrete sample 15 truly ftractureed when the stress state of cracked concrete test specimen 15 inside loaded with loading tester simultaneously.Concrete sample 15 preparations with dry are finished.
At last, it should be noted that above what enumerate only is specific embodiment of the utility model.Obviously, the utility model is not limited to above embodiment, and a lot of distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection domain of the present utility model.
Claims (6)
1. device of making concrete sample dry, comprise concrete sample prestress loading system, concrete crack expansion control system and test macro, it is characterized in that, described concrete sample prestress loading system comprises that prestress loads steel plate, load nut, prestress loads screw rod, foil gauge and strain testing instrument, two prestress load steel plate and load the screw rod connection by prestress, and load nut and be located at the junction that prestress loads steel plate and prestress loading screw rod, strain gauge adhesion loads on the screw rod at prestress, and is connected with the strain testing instrument by wire; Described concrete crack expansion control system comprises I class pre-embedded bolt, control screw rod and the control nut that is embedded in the concrete sample bottom surface, two I class pre-embedded bolts connect by the control screw rod, and the control nut is located at the junction of I class pre-embedded bolt and control screw rod; Described test macro comprises two II class pre-embedded bolts, test screw rod, hold-doun nut and the digital dial gauge that is embedded in the concrete sample side, be fixed with the test screw rod by hold-doun nut on the II class pre-embedded bolt, be fixed with digital dial gauge by hold-doun nut on another II class pre-embedded bolt;
Described I class pre-embedded bolt comprises Metallic rod and nut, and described nut is welded on an end of Metallic rod, and the diameter of nut is greater than the diameter of control screw rod; Described II class pre-embedded bolt comprises Metallic rod A and metal cap, the end of Metallic rod A is provided with the hole of Metallic rod A vertical direction with along the screw of Metallic rod A direction, metal cap comprises Metallic rod B and metal screw, Metallic rod B and metal screw are welded and fixed, the diameter of Metallic rod B is greater than the diameter of metal screw, the diameter of metal screw is less than the upper screwhole diameter along Metallic rod A direction of Metallic rod A, and one section of metal screw is installed in Metallic rod A along in the screw of Metallic rod A direction.
2. the device of making concrete sample dry according to claim 1 is characterized in that, the line of described two II class pre-embedded bolts is parallel with the concrete sample bottom surface.
3. the device of making concrete sample dry according to claim 1 is characterized in that, described loading nut is used for loading the load that the position control prestress of nut on prestress loading screw rod loads screw rod by adjusting.
4. the device of making concrete sample dry according to claim 1 is characterized in that, described control nut is used for by adjusting the width in the distance control concrete sample crack between two I class pre-embedded bolts.
5. the device of making concrete sample dry according to claim 1 is characterized in that, the bore dia of described Metallic rod A vertical direction is greater than the diameter of digital dial gauge with the test screw rod.
6. according to claim 1 to the device of the described making concrete sample of 5 any one dry, it is characterized in that, described concrete sample and concrete sample prestress loading system are arranged on the loading tester, and loading tester is used for providing three point loading effects to concrete sample.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320124126 CN203259386U (en) | 2013-03-18 | 2013-03-18 | Apparatus for making natural cracks of concrete test piece |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320124126 CN203259386U (en) | 2013-03-18 | 2013-03-18 | Apparatus for making natural cracks of concrete test piece |
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| CN203259386U true CN203259386U (en) | 2013-10-30 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175721A (en) * | 2013-03-18 | 2013-06-26 | 浙江大学 | Device for making natural cracks of concrete sample |
| CN104827550A (en) * | 2015-05-13 | 2015-08-12 | 中南大学 | Precracking rebar concrete sample molding die and sample molding method |
| CN106441054A (en) * | 2016-12-16 | 2017-02-22 | 中国建筑材料科学研究总院 | Wall structure deformation measuring device |
| CN106556529A (en) * | 2016-11-01 | 2017-04-05 | 许昌学院 | Crack-resistant performance of concrete assay device |
| CN112415175A (en) * | 2020-12-15 | 2021-02-26 | 中国路桥工程有限责任公司 | Physical model test device for ground fissure |
-
2013
- 2013-03-18 CN CN 201320124126 patent/CN203259386U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175721A (en) * | 2013-03-18 | 2013-06-26 | 浙江大学 | Device for making natural cracks of concrete sample |
| CN103175721B (en) * | 2013-03-18 | 2015-04-08 | 浙江大学 | Device for making natural cracks of concrete sample |
| CN104827550A (en) * | 2015-05-13 | 2015-08-12 | 中南大学 | Precracking rebar concrete sample molding die and sample molding method |
| CN104827550B (en) * | 2015-05-13 | 2017-02-22 | 中南大学 | Precracking rebar concrete sample molding die and sample molding method |
| CN106556529A (en) * | 2016-11-01 | 2017-04-05 | 许昌学院 | Crack-resistant performance of concrete assay device |
| CN106441054A (en) * | 2016-12-16 | 2017-02-22 | 中国建筑材料科学研究总院 | Wall structure deformation measuring device |
| CN112415175A (en) * | 2020-12-15 | 2021-02-26 | 中国路桥工程有限责任公司 | Physical model test device for ground fissure |
| CN112415175B (en) * | 2020-12-15 | 2023-01-06 | 中国路桥工程有限责任公司 | Physical model test device for ground fissure |
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