CN104360047A - Method and device for evaluating dynamic stability of self-compacting concrete of closed die cavity of plate-type ballastless track - Google Patents
Method and device for evaluating dynamic stability of self-compacting concrete of closed die cavity of plate-type ballastless track Download PDFInfo
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Abstract
The invention relates to a method and a device for evaluating dynamic stability of self-compacting concrete of a closed die cavity of a plate-type ballastless track. The method comprises the following testing steps: (1) pouring a self-compacting concrete mixture in a conical hopper 1; (2) allowing the mixture to freely flow in a closed die cavity 2 in which a groove 4 is formed and steel bar meshes 5 are arranged; (3) when the closed die cavity is full of the mixture, continuously pouring at a maintained pressure until the mixture rises 10cm in an observation hole 3, and stopping pouring; (4) weighing a self-compacting concrete mixture which is just prepared and 20cm away from the two ends of the die cavity, sieving by adopting a square hole sieve of which the mesh size is 5mm, and calculating the difference of proportions of the mortars sieved from the two types of mixtures to the concrete; (5) standing for 15 minutes, and testing the penetration depth of the observation hole by adopting a penetrometer 5. The method and the device disclosed by the invention can be used for actually simulating the flowing state of the self-compacting concrete in the closed die cavity in the pouring process, has the characteristics of being convenient to operate, high in test accuracy, applicable to sites and the like, and is applicable to rapid evaluation on dynamic stability of the self-compacting concrete of the plate-type ballastless track.
Description
Technical field:
The invention belongs to the technical field of measurement and test of building materials, be specifically related to a kind of plate-type ballastless track and close die cavity self-compacting concrete dynamic stability evaluation method and device, be applicable to the evaluation of self-compacting concrete, Cracking of High Flowing Concrete dynamic stability, be specially adapted to the evaluation that high-speed railway CRTS II plate-type non-fragment orbit Cha Qu and CRTS type III plate-type ballastless track close die cavity self-compacting concrete dynamic stability.
Background technology:
With concrete material self intelligent power realize structure from filling and self-compaction function be the important technical revolution utilizing material property to solve to be caused by construction factor Structural Endurance Problem.As the concrete Typical Representative of intelligent power---self-compacting concrete can application property, Technical Economy and environment friendly be applied to having in the CRTSIII plate-type ballastless track structure of China's independent intellectual property right because of its height.The version that CRTS type III plate-type ballastless track filling bed is special, proposes new technical requirement to filling bed self-compacting concrete: the filling bed that track plates and base are formed is closed die cavity and determined self-compacting concrete and should have high Self-leveling performance and good foam stability energy.The multiple inhibition such as the limited impression in filling bed closed die cavity space on reinforced mesh, base and the gate muscle at the bottom of track plates requires that filling bed concrete should have good gap by property, from Packing character and education resistance.Bottom filling bed, the water absorption character of geotextile separation layer flexible foundation and great friction coefficient determine filling bed self-compacting concrete and should possess high fluidity and high-moisture-retention.At the self-compacting concrete that this closed die cavity of plate-type ballastless track uses, should consider that self-compacting concrete has enough mobility, self-compacting concrete can pour into whole die cavity; Consider that self-compacting concrete has suitable stability again, at self-compacting concrete filling process and self-compacting concrete quiescing process, the aggregate in autodensing concrete almixture must not be emanated.
Self-compacting concrete stability can be divided into static segregation and dynamically emanate.Static stability refers to after concreting completes, and before sclerosis, interior generation during this period of time, is often vertical direction; Dynamic stability refers at concrete transportation, occurs in casting process, is often horizontal direction.More for the research of static stability at present, also bring in self-compacting concrete relevant criterion.Foreign Japan and American-European self-compacting concrete Specification, China's Specification proposes corresponding index to self-compacting concrete Detection of Stability, propose the test of mixture stability jumping table in " self-compacting concrete direction of design and construction " (CCES 02-2004), propose the requirement that coarse aggregate vibration isolation rate is not more than 10%.Accordingly, " self-dense concrete mixture stability testing device " (ZL 200720062718.9) openly knows clearly and adopts static segregation post method to evaluate the stability of autodensing concrete almixture, this device comprises Detection of Stability cylinder and jumping table, Detection of Stability honor is that measure-alike (diameter is φ 115mm by three joints, height 100mm) right cylinder stack together, descend most pitch circle column casing to be provided with base plate, Detection of Stability cylinder is placed in jumping table.Two cylindrical drum joints are provided with outstanding limit, and fix with bolt.The internal diameter of described cylindrical drum is 115mm, is highly 100mm.Described jumping table amplitude is 25 ± 2mm, vibration per second 1 time, and vibration number is 25 times." self-compacting concrete direction of design and construction " (CCES 02-2004) proposes the requirement that thickness that self-compacting concrete hardenite homogeneity should meet maturing upper surface screed is less than 15mm, but does not provide corresponding detection method." self-compacting concrete application technology code " (CECS203-2006) proposition V-type funnel evaluates self-compacting concrete education resistance by the time, and self-compacting concrete education resistance is divided into Three Estate, one-level: 10-25s, secondary: 7-25s, three grades: 4-25s.The capacity of V-type funnel is about 10L, makes material and can be metal or plastics, is provided with opens fast and have the bottom of watertightness at the position of leak discharging opening." self-compacting concrete application technology code " (JGJ/T 283-2012) proposes and adopts isolation rate and coarse aggregate vibration isolation rate two indices to evaluate the education resistance of self-compacting concrete, isolation rate is divided into two grades, namely 20% and be less than 15% is less than, isolation rate Cleaning Principle under static state sinks based on aggregate in autodensing concrete almixture, in test cylinder (overall height 300mm) upper strata (60mm), mortar accounts for concrete ratio, and mortar is that the square hole screen adopting concrete to cross 5mm obtains; Coarse aggregate vibration isolation rate test method is the same with " self-compacting concrete direction of design and construction " with evaluation criterion.Along with the expansion of self-compacting concrete range of application, the stability of autodensing concrete almixture becomes the key determining its application, and numerous scholars begin one's study self-compacting concrete static stability and dynamic stability gradually.The evaluation of self-compacting concrete stability roughly can be divided into several large class: the first kind is visual estimation of stability, the method is measuring self-compacting concrete divergence while, be four grades according to aggregate distribution in mixture, bleeding ring around by the analysis of stability of self-compacting concrete, the method has the features such as simple, and is included into " TestMethod for Slump Flow of Self-Consolidating Concrete " (ASTM C 1611-2014).Equations of The Second Kind is sieve analysis, get 10 ± 0.5L autodensing concrete almixture and be placed in bucket, and cover lid, the concrete taking a barrel top (4.8 ± 0.2) kg after level place leaves standstill 15min pours square hole screen into from 50 ± 5cm position, sieve top, weighs and gets concrete mass ratio by the mortar of sieve and institute.3rd class is static segregation post method, the method is by the right cylinder of a self-compacting concrete more piece cylindrical shell, the aggregate that static a period of time tests in the superiors and orlop autodensing concrete almixture distributes, and the method is included into " Test Method for Static Segregation of Self-Consolidating Concrete Using ColumnTechnique " (ASTM C1610-2014).4th class additive method, additive method comprises electrical conductivity method, sinks to test method(s) etc., but practical engineering application is not yet carried out in conceptual phase in these method many places.To lack a lot concerning the research that concrete is dynamically emanated compared to static state, but most research all thinks that dynamically segregation is that concrete occurs gradually after flowing through one period relatively grown or distance, or due to the extruding with template in casting process, collision waits effect to occur rapidly, and it depends on the surface characteristics of concrete flow characteristics and suspension medium.Self-compacting concrete dynamic stability method of testing mainly contains: flowing channel process and swing case test method(s) etc.The test philosophy of flowing channel process is the content difference utilizing autodensing concrete almixture to flow through to have aggregate after the skewed slot of certain degree of tilt, autodensing concrete almixture flows through the chute with 7 ° of 1.83m, without any barrier, there is susceptibility difference, be not suitable for the problems such as on-the-spot in the method.Swing the testing procedure of case test method(s): poured in the middle part of swing case by self-compacting concrete, surveying instrument tilts the initial depth of penetration in position, then with the speed of each two seconds, swings back and forth 60 times, finally make instrument keep balance, again measure and tilt position depth of penetration.The advantage of the method utilizes the number of oscillations swinging case can the flow distance of simulation concrete mixture, and shortcoming swings in case and do not place obstacles, and can not reflect the flow state of self-compacting concrete in practical structures.Although have now the research of self-compacting concrete dynamic stability, even do not have any method of testing to gain unanimous acceptance.More not for CRTS type III plate-type ballastless track self-compacting concrete layer close the feature such as die cavity, multiple obstruction (groove, reinforced mesh) the detection method of self-compacting concrete dynamic stability is proposed.
Summary of the invention:
The present invention is directed to and lack the present situation that high-speed railway plate type ballastless track closes the evaluation of die cavity self-compacting concrete dynamic stability, invent a kind of have visual, be applicable to scene and mixture method for estimating stability and the device of flow state in die cavity closed at non-fragment orbit by the board-like self-compacting concrete of objective simulation, to realize the field control to high-speed railway plate type ballastless track autodensing concrete almixture stability, the present invention is proposed.
Technical scheme of the present invention: a kind of plate-type ballastless track closes die cavity self-compacting concrete dynamic stability evaluation method and device, the method testing procedure: 1) pour into autodensing concrete almixture in broach hopper 1; 2) mixture flows freely in the closed die cavity 2 being with fluted 4 and built-in reinforced mesh 5; 3) when being full of mixture in closed die cavity, continuing pressurize perfusion, the 10cm until mixture rises in viewport 3, stopping perfusion; 4) take after just preparation and distance die cavity two ends 20cm autodensing concrete almixture, adopt 5mm square hole screen to sieve, calculate the difference that two kinds of lower mortars of mixture sieve account for concrete ratio; 5) static 15 minutes, penetrometer 5 is adopted to test the needle penetration of viewport.
Described broach hopper 1 is fixing on the frame 6.
Described closed die cavity is of a size of 120cm × 60cm × 10cm, and material is organic glass.
Described closed mold cavity bottoms arranges the groove of 2 10cm × 60cm × 10cm.
The described built-in reinforced mesh of closed die cavity, is of a size of 120cm × 60cm, and reinforced mesh is made up of longitudinally 3, the laterally reinforcing bar of 6 φ 10mm.
The base plate of described closed die cavity can be dismantled, and base plate can lay geotextile.
Described viewport is the right cylinder of φ 8cm × 20cm, is placed in directly over groove.
Described penetrometer is the cylindrical drum of aluminium alloy or plastics, and internal diameter, height and thickness are respectively 75mm, 50mm and 1mm, and weight is 40-60g.
Described pen. test, after pouring into complete static 15 minutes, penetrometer respectively measures 3 points at viewport and fill orifice.
Mechanism of the present invention: by closed die cavity and the perfusion operating mode of realistic simulation plate-type ballastless track self-compacting concrete layer, adopt die cavity to reflect the enclosure space that autodensing concrete almixture flows; Reinforced mesh, groove etc. is established to simulate the obstacle of autodensing concrete almixture flow process in employing; Fully reflect self-compacting concrete flow state in die cavity.Close die cavity and adopt organic glass material, self-compacting concrete flow state can be made visual.
Advantage of the present invention: the flow state of (1) real simulation self-compacting concrete under non-fragment orbit closes die cavity, multiple obstruction state, can objectively respond the essence of self-compacting concrete dynamic stability; (2) testing apparatus is simple, and method of testing is convenient, is not only applicable to testing laboratory's self-compacting concrete preparation, is also applicable to the quality control of working-yard self-compacting concrete; (3) the manufacturability simulation test of CRTS type III plate-type ballastless track self-compacting concrete can be substituted, reduce and take off plate number of times.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is broach hopper and support bracket fastened structural representation in Fig. 1.
Fig. 3 is the structural representation closing die cavity in Fig. 1.
Fig. 4 is the structural representation of penetrometer in Fig. 1.
In figure: 1-broach hopper, 2-fixed support, 3-close die cavity, 4-fill orifice, 5-viewport, 6-penetrometer.
Embodiment:
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is done and further illustrates.
Embodiment: autodensing concrete almixture is encased in broach hopper 1, allow autodensing concrete almixture free-falling from fill orifice 4, enter closed die cavity 3, autodensing concrete almixture flows freely in closed die cavity 3, after self-compacting concrete reaches surrounding, to contact with die cavity upper surface gradually, acquire a certain degree, mixture will overflow from viewport, when mixture exceeds die cavity 10cm, stop perfusion.Take the mixture at the autodensing concrete almixture after just preparation and distance 20cm place, die cavity end, 5mm square hole screen is adopted to sieve, calculate the difference that two kinds of lower mortars of mixture sieve account for concrete ratio, when the difference of slurry is less than 10%, self-compacting concrete dynamic stability is better; After static 15 minutes, test the pen. of viewport and fill orifice with penetrometer 5.After pen. head places 15-20 second, read the depth of penetration of penetrometer, when penetrometer needle penetration is less than 20mm, autodensing concrete almixture has good stability.
Above-mentioned is can understand and apply the invention for ease of those skilled in the art to the description of embodiment.Person skilled in the art obviously easily can make various amendment to these embodiments, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the invention is not restricted to embodiment here, those skilled in the art are according to announcement of the present invention, and the improvement made for the present invention and amendment all should within protection scope of the present invention.
Claims (9)
1. plate-type ballastless track closes die cavity self-compacting concrete dynamic stability evaluation method and a device, it is characterized in that: 1) in broach hopper 1, pour into autodensing concrete almixture; 2) mixture flows freely in the closed die cavity 2 being with fluted 4 and built-in reinforced mesh 5; 3) when being full of mixture in closed die cavity, continuing pressurize perfusion, the 10cm until mixture rises in viewport 3, stopping perfusion; 4) take after just preparation and distance die cavity two ends 20cm autodensing concrete almixture, adopt 5mm square hole screen to sieve, calculate the difference that two kinds of lower mortars of mixture sieve account for concrete ratio; 5) static 15 minutes, penetrometer 5 is adopted to test the needle penetration of viewport.
2. plate-type ballastless track according to claim 1 closes die cavity self-compacting concrete dynamic stability evaluation method and device, it is characterized in that: broach hopper 1 is fixing on the frame 6.
3. plate-type ballastless track according to claim 1 closes die cavity self-compacting concrete dynamic stability evaluation method and device, it is characterized in that: close die cavity and be of a size of 120cm × 60cm × 10cm, material is organic glass.
4. the plate-type ballastless track according to claim 1 and 2 closes die cavity self-compacting concrete dynamic stability evaluation method and device, it is characterized in that: closed mold cavity bottoms arranges the groove of 2 10cm × 60cm × 10cm.
5. the plate-type ballastless track according to claim 1 and 2 closes die cavity self-compacting concrete dynamic stability evaluation method and device, it is characterized in that: close the built-in reinforced mesh of die cavity, be of a size of 120cm × 60cm, reinforced mesh is made up of longitudinally 3, the laterally reinforcing bar of 6 φ 10mm.
6. the plate-type ballastless track according to claim 1 and 2 closes die cavity self-compacting concrete dynamic stability evaluation method and device, it is characterized in that: the base plate closing die cavity can be dismantled, and base plate can lay geotextile.
7. plate-type ballastless track according to claim 1 closes die cavity self-compacting concrete dynamic stability evaluation method and device, it is characterized in that: viewport is the right cylinder of φ 10cm × 20cm, is placed in directly over groove 4.
8. plate-type ballastless track according to claim 1 closes die cavity self-compacting concrete dynamic stability evaluation method and device, it is characterized in that: penetrometer is the cylindrical drum of aluminium alloy or plastics, internal diameter, height and thickness are respectively 75mm, 50mm and 1mm, and weight is 40-60g.
9. plate-type ballastless track according to claim 1 closes die cavity self-compacting concrete dynamic stability evaluation method and device, it is characterized in that: after pouring into complete static 15 minutes, 3 points measured by penetrometer in viewport.
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| CN108548750A (en) * | 2018-04-28 | 2018-09-18 | 中建西部建设西南有限公司 | A kind of device and method of evaluation pervious concrete mix physical performance |
| CN108709824A (en) * | 2018-06-12 | 2018-10-26 | 中国二冶集团有限公司 | Self-compacting concrete bleeding rate test device and test method |
| CN108982820A (en) * | 2018-07-19 | 2018-12-11 | 北京工业大学 | A kind of device and method of construction site detection concrete disintegration rate and stability |
| CN109342267A (en) * | 2018-11-19 | 2019-02-15 | 中铁十七局集团第工程有限公司 | III type non-fragment orbit self-compacting concrete test apparatus of CRTS |
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| CN110672455A (en) * | 2019-10-21 | 2020-01-10 | 武汉美好绿色建筑科技有限公司 | Self-compacting concrete homogeneity testing device and method |
| CN116289353A (en) * | 2023-03-02 | 2023-06-23 | 江苏科技大学 | Device for reducing filling layer self-compaction concrete filling segregation degree and operation method |
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| CN104777078B (en) * | 2015-05-11 | 2017-06-09 | 中南大学 | Filling bed self-dense concrete mixture stability testing device and its method of testing |
| CN104777078A (en) * | 2015-05-11 | 2015-07-15 | 中南大学 | Stability testing device for self-compact concrete mixture of filling layer and testing method of stability testing device |
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| CN108709824A (en) * | 2018-06-12 | 2018-10-26 | 中国二冶集团有限公司 | Self-compacting concrete bleeding rate test device and test method |
| CN108982820A (en) * | 2018-07-19 | 2018-12-11 | 北京工业大学 | A kind of device and method of construction site detection concrete disintegration rate and stability |
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| CN109342267A (en) * | 2018-11-19 | 2019-02-15 | 中铁十七局集团第工程有限公司 | III type non-fragment orbit self-compacting concrete test apparatus of CRTS |
| CN109440652A (en) * | 2018-12-11 | 2019-03-08 | 中交公局集团有限公司 | Assembled capping beam pier pile full scale model and crack pouring construction process using same |
| CN109440652B (en) * | 2018-12-11 | 2024-02-06 | 中交一公局集团有限公司 | Full-scale model of fabricated bent cap pier pile and crack pouring construction process using full-scale model |
| CN110672455B (en) * | 2019-10-21 | 2022-09-30 | 武汉美好绿色建筑科技有限公司 | Self-compacting concrete homogeneity testing device and method |
| CN110672455A (en) * | 2019-10-21 | 2020-01-10 | 武汉美好绿色建筑科技有限公司 | Self-compacting concrete homogeneity testing device and method |
| CN116289353A (en) * | 2023-03-02 | 2023-06-23 | 江苏科技大学 | Device for reducing filling layer self-compaction concrete filling segregation degree and operation method |
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Address after: 100081 Beijing city Haidian District Daliushu Road No. 2 Patentee after: Railway Construction Research Institute of China Railway Research Institute Group Co., Ltd. Address before: 100081 Beijing city Haidian District Daliushu Road No. 2 Patentee before: Railway Construction Institute of China Academy of Railway Sciences |
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