CN102175518A - Method for testing flexural tensile strength of pavement concrete under complete road surface - Google Patents
Method for testing flexural tensile strength of pavement concrete under complete road surface Download PDFInfo
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- CN102175518A CN102175518A CN 201110041782 CN201110041782A CN102175518A CN 102175518 A CN102175518 A CN 102175518A CN 201110041782 CN201110041782 CN 201110041782 CN 201110041782 A CN201110041782 A CN 201110041782A CN 102175518 A CN102175518 A CN 102175518A
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Abstract
The invention discloses a method for testing flexural tensile strength of pavement concrete under a complete road surface, and the method comprises the following steps: symmetrically arranging reverse L-shaped anchoring reinforcing steel bars on two opposite side walls of a square annular mould and fixing the wood mould on a base course through the anchoring reinforcing steel bars; pouring concrete on the base course till the poured height of the concrete is as same as the height of the mould; after finishing pouring, maintaining the road surface under a road surface maintaining condition till reaching a detection period, and then performing a bending test on a concrete block with a preset size by utilizing a pressure tester, thereby acquiring the concrete flexural tensile strength fC; and after taking out the concrete block from the inner cavity of the mould, welding the corresponding anchoring reinforcing steel bars on the opposite side walls of the mould through a support reinforcing steel bar, pouring concrete, and finally vibrating and compacting the road surface. By using the method provided by the invention, the pit can be easily and conveniently repaired after the concrete is taken out, the repairing quality is reliable, the cost is less than the on-site core-drilling cost, the repairing operation is more convenient than the repairing operation after a core is drilled, and the repairing quality is further ensured.
Description
Technical field
The present invention relates to the detection method of mechanical performance of concrete, specifically is a kind of pavement concrete flexural tensile strength detection method.
Background technology
In the highway cement concrete pavement quality control, the intensity of facing concrete is the key index of decision surface layer structure bearing capacity and serviceable life or definite surface layer desired thickness.And pavement strength is to be controlled by cement and concrete pavement flexural tensile strength and two indexs of cleavage strength.In the work progress, generally make the girder test specimen of 150 mm * 150 mm * 550 mm, standard curing 28 d draw the flexural tensile strength index, as the main foundation of judging that pavement strength is whether qualified; After pavement forming, because the girder sample dimensions is bigger, difficult forming and road pavement are destroyed bigger, therefore adopt the right cylinder test specimen, survey its cleavage strength f
Sp, and be converted into flexural tensile strength f
cAs the whether qualified judgment basis of pavement strength.Point out in " highway cement concrete pavement slding form operation technical regulation " (JTJ/T 037.1-2000): do not having under this engineering statistics formula situation, crushed stone concrete intensity conversions such as ls, grouan can be with reference to formula: fc=1.868f
Sp 0.871And highway, Class I highway engineering should obtain the statistical formula of engineering separately by test.In the explanation of " highway engineering cement and cement concrete testing regulations " (JTG E30-2005) clause, point out in addition, owing in aspect world wides such as sample dimensions, loading speed, go back disunity at present, so the bending tensile strength and the conversion relation between the cleavage strength that obtain are also more discrete, still can not draw the conversion relation of be sure oing.
Summary of the invention
The technical problem to be solved in the present invention provides the pavement concrete flexural tensile strength detection method under a kind of complete road surface, and solution has the inaccurate and difficult problem of test back reparation of method of testing now.
Technical scheme of the present invention is:
Pavement concrete flexural tensile strength detection method under a kind of complete road surface comprises the following steps:
The first step, all symmetry is installed the inverted L shape anchor bar on two groups of opposing sidewalls of square annular die, and wooden die is fixed on the sub-surface by anchor bar;
Second step, on sub-surface deposit concrete, concrete cast height is identical with the height of mould; Behind the casting complete, maintenance is to detecting the length of time under the maintenance of surface condition, or under the maintenance of surface condition, from mould, take out concrete block after maintenance 6-8 days and move to and carry out standard curing 28 days in the testing laboratory, concrete block with given size carries out bending test on pressure testing machine then, records concrete flexural tensile strength f
C
The 3rd step, after described concrete block takes out from dies cavity, mould is removed, on the mould opposing sidewalls in twos the anchor bar of correspondence weld by spacer bar, deposit concrete then, the closely knit road surface that shakes down gets final product.
The planar dimension of described wooden die inner chamber is set to 150-160mm * 550-560mm, highly is 150-160mm, and the wooden die inside surface scribbles one deck release agent.
The anchorage length of described inverted L shape anchor bar is 75-85 mm, and the length of its horizontal component is 190-210mm, and vertically the length of part is the height that anchorage length adds 1/2nd wooden die.
Maintenance of surface be pavement concrete build finish after, carry out surface dressing, after concrete final set, adopt straw oversite concrete surface then, and uniform sprinkling, it was kept wet to 7 days, during the maintenance of surface, forbid vehicle, walk.Detect to be apart from the fate of concreting the same day and detect the length of time, generally detecting the length of time is 28 days.
Described standard curing be temperature at 18-24 ℃, relative humidity is the standard curing room maintenance more than 95%.
The present invention is placing mould on the road surface pavement when pavement construction, and cast simultaneously, removes mould and test specimen is used for detection, the flexural tensile strength f that detection method is measured after the expiration at reproduction age
CAccurately and reliably, do not need to convert, and pass through the welding spacer bar after taking out concrete block by formula, and the feasible road surface and in aggregates with peripheral concrete of filling up of the mode of cast, the hole repairing is simple and easy, quick, and repairing quality is reliable; On-the-spot brill core method cost is low than adopting, and simultaneously, more convenient than the patch work behind the brill core, repairing quality more can guarantee.
Description of drawings
Fig. 1 is the mounting structure synoptic diagram of wooden die of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is after wooden die is removed, the syndeton synoptic diagram of anchor bar.
Embodiment
Pavement concrete flexural tensile strength detection method comprises the following steps:
(1), sees Fig. 1, Fig. 2, symmetry is installed three groups of L type anchor bars on one group of opposing sidewalls of square ring-type wooden die, symmetry is installed two groups of L type anchor bars on another group opposing sidewalls, and wooden die 1 is fixed on the sub-surface 1 by anchor bar 3, and anchorage length is 80mm; Wherein, the planar dimension of wooden die 2 inner chambers is set to 150mm * 550mm, highly be 150mm, wooden die 2 inside surfaces scribble one deck release agent, it is the hot rolled ribbed steel bar of 12mm that inverted L shape anchor bar 3 is selected diameter for use, the length of horizontal component is 200mm, and vertically the length of part is the height that anchorage length adds 1/2nd wooden die;
(2), deposit concrete on sub-surface 1, concrete cast height is identical with the height of wooden die 2, before the concrete final set, sheep eye nail is screwed on the concrete of wooden die 2 inner chambers, so that after the concrete final set, portable sheep eye nail takes out the concrete block of wooden die 2 inner chambers; After concrete depositing is finished, maintenance is to detecting the length of time under the maintenance of surface condition, or maintenance after 7 days moves to concrete block and carries out standard curing 28 days in the testing laboratory under the maintenance of surface condition, then concrete block is carried out bending test on pressure testing machine, records concrete flexural tensile strength f
C
(3), after concrete block takes out from wooden die 2 inner chambers, wooden die 2 is removed, anchor bar 3 corresponding in twos on the mould opposing sidewalls welds (see figure 3) by the identical spacer bar 4 of diameter, the concrete of the high strength grade of an amount of micro-expanding agent is mixed in cast then, and the closely knit road surface that shakes down gets final product.
Claims (4)
1. the pavement concrete flexural tensile strength detection method under the complete road surface is characterized in that: comprise the following steps:
The first step, all symmetry is installed the inverted L shape anchor bar on two groups of opposing sidewalls of square annular die, and wooden die is fixed on the sub-surface by anchor bar;
Second step, on sub-surface deposit concrete, concrete cast height is identical with the height of mould; Behind the casting complete, maintenance is to detecting the length of time under the maintenance of surface condition, or under the maintenance of surface condition, from mould, take out concrete block after maintenance 6-8 days and move to and carry out standard curing 28 days in the testing laboratory, concrete block with given size carries out bending test on pressure testing machine then, records concrete flexural tensile strength f
C
The 3rd step, after described concrete block takes out from dies cavity, mould is removed, on the mould opposing sidewalls in twos the anchor bar of correspondence weld by spacer bar, deposit concrete then, the closely knit road surface that shakes down gets final product.
2. pavement concrete flexural tensile strength detection method according to claim 1 is characterized in that: before the described concrete final set, sheep eye nail is screwed on the concrete of dies cavity, the concrete block after the final set takes out from dies cavity by sheep eye nail.
3. pavement concrete flexural tensile strength detection method according to claim 1, it is characterized in that: the planar dimension of described dies cavity is set to 150-160mm * 550-560mm, highly is 150-160mm, and mould inner surface scribbles one deck release agent.
4. pavement concrete flexural tensile strength detection method according to claim 3, it is characterized in that: the anchorage length of described inverted L shape anchor bar is 75-85 mm, the length of its horizontal component is 190-210mm, and vertically the length of part is the height that anchorage length adds 1/2nd wooden die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201110041782 CN102175518A (en) | 2011-02-22 | 2011-02-22 | Method for testing flexural tensile strength of pavement concrete under complete road surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110041782 CN102175518A (en) | 2011-02-22 | 2011-02-22 | Method for testing flexural tensile strength of pavement concrete under complete road surface |
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| CN102175518A true CN102175518A (en) | 2011-09-07 |
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| CN 201110041782 Pending CN102175518A (en) | 2011-02-22 | 2011-02-22 | Method for testing flexural tensile strength of pavement concrete under complete road surface |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183417A (en) * | 2011-03-04 | 2011-09-14 | 安徽省（水利部淮河水利委员会）水利科学研究院 | Method for testing flexural-tensile strength of concrete |
| CN106442121A (en) * | 2016-06-29 | 2017-02-22 | 西安工业大学 | Test device for studying load imposed on anchor rods by separation layer and making method |
| CN110186778A (en) * | 2019-06-12 | 2019-08-30 | 卡本科技集团股份有限公司 | A kind of method for testing and detecting of carbon fiber mesh reinforced concrete beam |
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| CN101021458A (en) * | 2006-11-27 | 2007-08-22 | 青岛建设集团公司 | Large volume concrete structural solid strength detecting method |
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| CN101551380A (en) * | 2009-05-01 | 2009-10-07 | 徐州建筑职业技术学院 | Method for estimating concrete strength of thin-walled structure by using small core sample strength |
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| CN101063344A (en) * | 2006-04-29 | 2007-10-31 | 邱则有 | Reinforced concrete pre-fabricated panels |
| CN101021458A (en) * | 2006-11-27 | 2007-08-22 | 青岛建设集团公司 | Large volume concrete structural solid strength detecting method |
| CN101551380A (en) * | 2009-05-01 | 2009-10-07 | 徐州建筑职业技术学院 | Method for estimating concrete strength of thin-walled structure by using small core sample strength |
| CN101819135A (en) * | 2010-05-13 | 2010-09-01 | 长沙理工大学 | Method for measuring bond strength between high-intensity glass fiber rib and concrete |
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| 《中华人民共和国国家标准 GB/T50081-2002》 20030110 戎君明等 普通混凝土力学性能试验方法 5-6，9-10，21-22 , * |
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| 《长安大学学报(自然科学版)》 20060731 郑木莲等 多孔混凝土的强度特性 20-25 第26卷, 第4期 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183417A (en) * | 2011-03-04 | 2011-09-14 | 安徽省（水利部淮河水利委员会）水利科学研究院 | Method for testing flexural-tensile strength of concrete |
| CN106442121A (en) * | 2016-06-29 | 2017-02-22 | 西安工业大学 | Test device for studying load imposed on anchor rods by separation layer and making method |
| CN106442121B (en) * | 2016-06-29 | 2019-07-19 | 西安工业大学 | A kind of research absciss layer is to the experimental rig and production method of bolt action load |
| CN110186778A (en) * | 2019-06-12 | 2019-08-30 | 卡本科技集团股份有限公司 | A kind of method for testing and detecting of carbon fiber mesh reinforced concrete beam |
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Application publication date: 20110907 |