CN114397198A - Novel test method for Z-shaped precast crack concrete shear strength test specimen - Google Patents
Novel test method for Z-shaped precast crack concrete shear strength test specimen Download PDFInfo
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- CN114397198A CN114397198A CN202210043184.4A CN202210043184A CN114397198A CN 114397198 A CN114397198 A CN 114397198A CN 202210043184 A CN202210043184 A CN 202210043184A CN 114397198 A CN114397198 A CN 114397198A
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- 238000012360 testing method Methods 0.000 title claims abstract description 67
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000002474 experimental method Methods 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 2
- 238000009415 formwork Methods 0.000 claims 9
- 238000003754 machining Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 238000010008 shearing Methods 0.000 abstract description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0064—Initiation of crack
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a test method of a novel Z-shaped precast crack concrete shear strength test piece, which comprises the following test processes: firstly, a Z-shaped test piece is integrally poured by a preparation mould; symmetrically processing vertically-oriented prefabricated cracks on the left side and the right side of the test specimen through cutting equipment; uniformly distributed pressure is applied to the upper side and the lower side of the test specimen through hydraulic equipment; and fourthly, when the test specimen cracks between the prefabricated cracks on the two sides, the experiment is completed. The invention is mainly used for testing the shear strength of large-size rock-fill concrete materials, and if a beam type test piece is manufactured, the size of the test piece is overlarge, the requirement on test conditions is overhigh, and the shear failure process is difficult to control. According to the preparation of traditional Z type test piece, because the rock-fill concrete can not dispose the reinforcing bar, can not realize ideal shearing failure face. Due to the stress concentration effect, the depth of the prefabricated crack can be controlled by comparing with the shear test result of the beam type test piece, and the precision of the experimental method can be revised.
Description
Technical Field
The invention relates to the technical field of large-scale rockfill concrete mechanical property testing, in particular to a testing method of a novel Z-shaped precast crack concrete shear strength testing test piece.
Background
The self-compacting rock-fill concrete is used for building large dams, and the shear strength of the self-compacting rock-fill concrete is an important mechanical property index. Because the aggregate diameter is large and generally exceeds 250mm, the size of the manufactured test specimen is overlarge, the material is wasted, and the test is difficult. Since the steel bars cannot be arranged inside the test specimen, it is almost impossible to manufacture other relatively small shear test specimens except the beam shear specimen.
Therefore, a test piece which ensures that the size of the test piece is not large as much as possible and is convenient to test needs to be found, and the requirements of the traditional test conditions and analysis methods can be met.
Disclosure of Invention
The invention aims to provide a novel test method for a Z-shaped precast crack concrete shear strength test specimen, which aims to overcome the defects caused in the prior art.
A test method of a novel Z-shaped precast crack concrete shear strength test piece comprises the following test steps:
step 1: taking self-compacting rock-fill concrete as a filling material, and integrally pouring a Z-shaped test piece through a preparation mould;
step 2: symmetrically processing vertically-oriented prefabricated cracks on the left side and the right side of a test specimen through cutting equipment;
and step 3: uniformly distributing pressure on the upper side and the lower side of a test specimen through hydraulic equipment;
and 4, step 4: when the test specimen cracks between the prefabricated cracks on both sides, the experiment is completed.
Preferably, the preparation mould comprises a side mould plate and a lower mould plate, wherein:
the side templates are provided with four side templates which are distributed in a circular array, the side templates are vertically arranged, two rows of hinged seats are symmetrically distributed on the left and right of the outer wall of each side template, J-shaped placing hooks are horizontally hinged on the hinged seats, dumbbell clamping and placing rods are horizontally lapped on a pair of adjacent placing hooks on a pair of adjacent side templates, clamping and placing strips made of angle steel are vertically clamped at the edges of a pair of adjacent side templates, right-angled triangular clamping and placing blocks are clamped between the clamping and placing rods, and right-angled triangular technological convex plates are symmetrically connected to the centers of the inner walls of the front side template and the rear side template;
the lower template is horizontally arranged, an annular clamping groove is formed in the upper side of the lower template, the four positioning plates are distributed in a circular array, the positioning plates are vertically arranged, the lower portions of the positioning plates are correspondingly inserted into the clamping groove, and lifting pieces are welded on the outer wall of each positioning plate in the middle.
Compared with the prior art, the invention has the following advantages:
the test method of the novel Z-shaped precast crack concrete shear strength test piece is suitable for the shear strength test of the self-compacting rock-fill concrete material. The self-compaction rock-fill concrete and the preparation of the recycled aggregate self-compaction rock-fill concrete are characterized in that two prefabricated cracks are formed on the side surface of a traditional Z-shaped test piece, the position where the shear crack is expected to be located is located in the same shear plane, the shear rigidity is small, a weak shear plane is formed, but the weak shear plane and the crack are not broken, the test piece is subjected to shear failure along the shear plane, and the average shear strength of the shear plane can be obtained by dividing the actual shear area by the failure load. The invention is mainly used for testing the shear strength of large-size rock-fill concrete materials, and if a beam type test piece is manufactured, the size of the test piece is overlarge, the requirement on test conditions is overhigh, and the shear failure process is difficult to control. The precision of the experimental method can be revised by comparing with the shear test result of the beam type test piece.
Drawings
Fig. 1 is a schematic structural view of a preparation mold in the present invention.
Fig. 2 and 3 are schematic views of the construction of sideforms in a preparation mould.
Fig. 4 and 5 are schematic structural views of a lower template in a preparation mold.
Fig. 6 is a schematic structural view of a test piece in the present invention.
Wherein:
10-preparing a mould; 101-sideform; 102-a hinged seat; 103-placing a hook; 104-clamping and releasing rod; 105-card placing strip; 106-clamping block; 107-technological convex plate; 108-a lower template; 108 a-card slot; 109-a positioning plate; 110-lifting and placing sheets;
20-testing the test piece; 20 a-process gap; 20 b-pre-crack.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 6, a method for testing a novel Z-shaped precast crack shear strength test specimen includes the following steps:
step 1: taking self-compacting rock-fill concrete as a filling material, and integrally pouring a Z-shaped test specimen 20 through a preparation mold 10;
step 2: symmetrically processing vertically-oriented prefabricated cracks 20a on the left side and the right side of the test specimen 20 through cutting equipment;
and step 3: uniformly distributed pressure is applied to the upper side and the lower side of the test specimen 20 through hydraulic equipment;
and 4, step 4: the experiment was completed when the test piece 20 cracked between the two side prepared cracks 20 a.
After the novel Z-shaped precast crack concrete shear strength test piece 20 is formed by integral casting, two precast cracks with the same depth need to be symmetrically processed on the left side surface and the right side surface of the test piece 20, so that the shear crack surface of the processed test piece 20 is smaller than that of the original test piece 20, in the longitudinal loading process, the shear surface bears the direct shearing action and is the same as that of the original test piece 20, the shear effect of the direct shear surface is not influenced by the prefabricated longitudinal cracks, the fracture effect cannot be generated, but the shear rigidity of the shear surface is larger than that of the shear surface due to partial materials except the shear surface, the shear damage can only occur at the shear surface, the cracking direction is ensured to occur along the shear surface, and the effect of limiting the crack direction by reinforcing bars is achieved.
In this embodiment, the preparation mold 10 includes a side mold plate 101 and a lower mold plate 108, wherein:
the four side templates 101 are distributed in a circular array, the side templates 101 are vertically arranged, two rows of hinged seats 102 are symmetrically distributed on the outer wall of each side template 101 in a left-right mode, J-shaped placing hooks 103 are horizontally hinged to the hinged seats 102, dumbbell clamping and placing rods 104 are horizontally placed on a pair of adjacent placing hooks 103 on a pair of adjacent side templates 101, clamping and placing strips 105 made of angle steel are vertically clamped at edges of the pair of adjacent side templates 101, right-angled triangle clamping and placing blocks 106 are clamped between the clamping and placing rods 104 and the clamping and placing strips 105, and right-angled triangle technological convex plates 107 are symmetrically connected to the centers of the inner walls of the front side template 101 and the rear side template 101;
the lower bolster 108 sets up horizontally and its upside is equipped with annular card and puts groove 108a, locating plate 109 is equipped with four and is circular array distribution, locating plate 109 sets up perpendicularly and its lower part corresponds to be inserted and put in card puts groove 108a, it has lifting piece 110 to weld between two parties on the outer wall of locating plate 109.
When the preparation mould of the novel Z-shaped precast crack concrete shear strength test specimen is actually applied, the preparation mould comprises the following operation steps:
step 1: uniformly brushing a release agent on the upper surface of the lower template 108 and the inner surfaces of the four side templates 101;
step 2: sequentially clamping and installing four positioning plates 109 in a clamping groove 108a of the lower template 108, sequentially stacking the four side templates 101 on the inner sides of the four positioning plates 109, wherein the bottom ends of the four side templates are vertically abutted against the upper side of the lower template 108, and the outer surfaces of the lower parts of the four side templates are abutted against the inner surfaces of the positioning plates 109 in parallel;
and step 3: horizontally putting a clamping and placing rod 104 on a pair of close placing hooks 103 on a pair of adjacent side templates 101, vertically clamping and placing a clamping and placing strip 105 at the edge of the pair of adjacent side templates 101, and clamping and placing blocks 106 between the clamping and placing rod 104 and the clamping and placing strip 105;
and 4, step 4: the Z-shaped test specimen 20 is integrally cast by using self-compacting rock-fill concrete as a filling material through a preparation mold 10.
The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (2)
1. A novel test method for a Z-shaped precast crack concrete shear strength test specimen is characterized by comprising the following steps: the method comprises the following testing steps:
step 1: taking self-compacting rock-fill concrete as a filling material, and integrally pouring a Z-shaped test specimen (20) through a preparation mould (10);
step 2: machining vertically-oriented prefabricated cracks (20a) on the left side and the right side of a test specimen (20) symmetrically by using cutting equipment;
and step 3: uniformly distributed pressure is applied to the upper side and the lower side of a test specimen (20) through hydraulic equipment;
and 4, step 4: when the test piece (20) cracks between the two-sided pre-cracks (20a), the experiment is completed.
2. The test method of the novel Z-shaped precast crack concrete shear strength test piece according to claim 1, characterized in that: the preparation mould (10) comprises a side mould plate (101) and a lower mould plate (108), wherein:
the dumbbell type side formwork comprises side formworks (101), wherein the side formworks (101) are arranged in a circular array, the side formworks (101) are vertically arranged, two rows of hinged seats (102) are symmetrically distributed on the outer wall of the side formworks in the left-right direction, J-shaped placing hooks (103) are horizontally hinged on the hinged seats (102), dumbbell clamping and placing rods (104) are horizontally arranged on a pair of adjacent placing hooks (103) on a pair of adjacent side formworks (101), clamping and placing strips (105) made of angle steel are vertically clamped at edges of the pair of adjacent side formworks (101), right-angled triangular clamping and placing blocks (106) are clamped between the clamping and placing rods (104) and the clamping and placing strips (105), and right-angled triangular technological convex plates (107) are symmetrically connected to the centers of the inner walls of the front side formwork and the rear side formwork (101);
lower bolster (108) level setting and its upside are equipped with annular card and put groove (108a), locating plate (109) are equipped with four and are circular array distribution, locating plate (109) set up perpendicularly and its lower part corresponds to be inserted in card and put groove (108a), the welding is placed in the middle on the outer wall of locating plate (109) has lifting piece (110).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210043184.4A CN114397198A (en) | 2022-01-14 | 2022-01-14 | Novel test method for Z-shaped precast crack concrete shear strength test specimen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210043184.4A CN114397198A (en) | 2022-01-14 | 2022-01-14 | Novel test method for Z-shaped precast crack concrete shear strength test specimen |
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| CN114397198A true CN114397198A (en) | 2022-04-26 |
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| CN202210043184.4A Pending CN114397198A (en) | 2022-01-14 | 2022-01-14 | Novel test method for Z-shaped precast crack concrete shear strength test specimen |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200372305Y1 (en) * | 2004-10-02 | 2005-01-10 | 이상학 | Concrete structure curing formwork apparatus |
| CN101074560A (en) * | 2007-06-08 | 2007-11-21 | 清华大学 | Method for constructing normal piled concrete |
| CN106092769A (en) * | 2016-06-02 | 2016-11-09 | 长沙理工大学 | Concrete fatigue test system under bending shear stress state |
| CN208283199U (en) * | 2018-03-06 | 2018-12-25 | 同济大学 | A kind of removable external constraint test specimen for direct shear test |
| CN209624242U (en) * | 2019-02-21 | 2019-11-12 | 中国三峡建设管理有限公司 | Edge splitting method test concrete fracture performance pours mold |
| CN112268815A (en) * | 2020-09-02 | 2021-01-26 | 西安理工大学 | Test method for ice pulling force of concrete dam in cold region |
| CN112326464A (en) * | 2020-11-25 | 2021-02-05 | 湖南科技大学 | Double-gap rock shear strength testing device and testing method |
| CN214472182U (en) * | 2021-04-01 | 2021-10-22 | 西京学院 | Concrete standard sample making devices convenient to dismantle |
| CN216782194U (en) * | 2022-01-14 | 2022-06-21 | 南通理工学院 | Preparation mould of prefabricated crack Z type concrete shear strength test piece |
-
2022
- 2022-01-14 CN CN202210043184.4A patent/CN114397198A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200372305Y1 (en) * | 2004-10-02 | 2005-01-10 | 이상학 | Concrete structure curing formwork apparatus |
| CN101074560A (en) * | 2007-06-08 | 2007-11-21 | 清华大学 | Method for constructing normal piled concrete |
| CN106092769A (en) * | 2016-06-02 | 2016-11-09 | 长沙理工大学 | Concrete fatigue test system under bending shear stress state |
| CN208283199U (en) * | 2018-03-06 | 2018-12-25 | 同济大学 | A kind of removable external constraint test specimen for direct shear test |
| CN209624242U (en) * | 2019-02-21 | 2019-11-12 | 中国三峡建设管理有限公司 | Edge splitting method test concrete fracture performance pours mold |
| CN112268815A (en) * | 2020-09-02 | 2021-01-26 | 西安理工大学 | Test method for ice pulling force of concrete dam in cold region |
| CN112326464A (en) * | 2020-11-25 | 2021-02-05 | 湖南科技大学 | Double-gap rock shear strength testing device and testing method |
| CN214472182U (en) * | 2021-04-01 | 2021-10-22 | 西京学院 | Concrete standard sample making devices convenient to dismantle |
| CN216782194U (en) * | 2022-01-14 | 2022-06-21 | 南通理工学院 | Preparation mould of prefabricated crack Z type concrete shear strength test piece |
Non-Patent Citations (3)
| Title |
|---|
| ESTEFANÍA CUENCA 等: "Shear Behavior of Self-Compacting Concrete and Fiber-Reinforced Concrete Push-Off Specimens", 《DESIGN, PRODUCTION AND PLACEMENT OF SELF-CONSOLIDATING CONCRETE》, pages 429 - 438 * |
| HU ZHOU 等: "Effect of rock shear keys on the shear performance of cold joints in rock-filled concrete structures _Experimental and numerical investigation", 《CONSTRUCTION AND BUILDING MATERIALS》, pages 1 - 15 * |
| 任明倩 等: "堆石骨料对混凝土层面剪切性能影响的试验研究", 《清华大学学报(自然科学版)》, pages 967 - 974 * |
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