CN104777078A - Stability testing device for self-compact concrete mixture of filling layer and testing method of stability testing device - Google Patents
Stability testing device for self-compact concrete mixture of filling layer and testing method of stability testing device Download PDFInfo
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Abstract
The invention discloses a stability testing device for a self-compact concrete mixture of a filling layer and a testing method of the stability testing device. The stability testing device is composed of a support, a surface layer slurry thickness tester (2) and a cylindrical barrel. The cylindrical barrel is arranged at the center of the bottom of the support. The surface layer slurry thickness tester (2) is located right above the cylindrical barrel, vertically arranged in a hollow conduit (6) at the central position of the support, and fixed through a fastener. The surface layer slurry thickness tester (2) can freely fall downwards along the support after the fastener is loosened. The stability testing device has the advantages of being easy to operate, convenient to use, scientific, reasonable and the like, is wide in application range and particularly suitable for controlling the quality of the self-compact concrete construction of a CRTSIII plate type ballastless track filling layer or like structures.
Description
Technical field
The present invention relates to a kind of performance test and evaluation method of railway engineering materials, be specifically related to a kind of experiment test device and evaluation method of the autodensing concrete almixture stability for rapid transit railway III-type plate non-fragment orbit filling bed.
Background technology
China Express Railway building technology achieves remarkable achievement, construction operation mileage the first in the world.At present, China Express Railway track structure mainly adopts non-fragment orbit technology, and wherein cover the multiple platy ballastless track structure patterns such as CRTSI type, CRTS II type and CRTSIII type, filling bed is critical component and the core technology of above-mentioned track structure.CRTSI type, CRTS II plate-type non-fragment orbit adopt cement emulsified asphalt mortar filling bed technology, are a kind of by introducing, absorbing, digest the non-fragment orbit technology innovated again; CRTSIII plate-type ballastless track structure adopts self-compacting concrete filling layer technology, and be the ballastless track structure new technology having China's independent intellectual property right, its structural shape as shown in Figure 1.
Can clearly be seen by Fig. 1, the transversal section of CRTSIII plate-type ballastless track structure is made up of concrete support layer 8, self-compacting concrete packed layer 9, precast track plate 10 and a few part such as fastener and rail from bottom to up, wherein self-compacting concrete filling layer is its key stratum structure, bear the functions such as adjustment, supporting, power transmission, self-compacting concrete filling layer quality concerns the performance of whole track structure.Self-compacting concrete filling layer has been constructed in bottom support layer, top precast track plate carries out having constructed after placing leveling and two collateral good templates.Obviously, being carried out to concrete pouring construction in the airtight horizontal space that an all around and upper and lower 6 faces are all closed is the abnormal difficult thing of part, and also there is the obstructions such as bar-mat reinforcement in confined space, external force is not allowed to vibrate in work progress, can only rely on the whole confined space of concrete self gravitation filling, this will look for novelty and mix self-compacting concrete and have very excellent serviceability.Therefore, the autodensing concrete almixture performance that rational evaluation can be used for pouring into high-quality filling bed seems very crucial.
Autodensing concrete almixture need to possess high mobility and gap by the stability of property and excellence (namely casting process or after being poured into mould in mixture each component there is not excessive relative motion, keep overall uniform character), could realize nothing vibrate under condition build closely knit shaping.For ensureing its high-quality construction, Chinese scholars has carried out a lot of valuable work with regard to the quantitative test of the above-mentioned performance of autodensing concrete almixture and evaluation, and develop many proving installations and method [1], as proving installation and methods such as slump cone, L-type instrument, U-shaped instrument, v-shaped funnel, J-ring, jumping table test, wet screening, infiltration methods.At present except for the mobility of autodensing concrete almixture, gap by the slump cone method, L-type instrument, U-shaped instrument, v-shaped funnel, J-ring etc. of property comparatively receive by everybody except, method of testing about autodensing concrete almixture stability need further exploration, and particularly these methods are mainly for the self-compacting concrete for construction work.For scientific evaluation is used for the workability of CRTSIII slab track filling bed self-compacting concrete, relevant unit of China is as China Academy of Railways Sciences, the researchist of Central South University has made many effort, work out " the provisional technical conditions of high-speed railway CRTSIII plate-type ballastless track filling bed self-compacting concrete " [2], propose employing slump cone, L-type instrument, J-ring, the test units such as cartridge [3] come the mobility (fillibility) of test evaluation autodensing concrete almixture and gap by property etc., but there is not the specific aim test and evaluation method of autodensing concrete almixture stability in these methods.Obviously, construction object involved in the present invention---slab track filling bed is the special structure of a class, to Performance of Self-compacting Concrete particularly stability propose more harsh requirement, self-compacting concrete after building must bond well with the high strength precast concrete rail plate of top layer, this just requires that the overall homogeneity of the filling bed self-compacting concrete after building is good, upper surface is unlikely there is layer of slurry or bubble layer etc., adopts above-mentioned existing method cannot evaluate the aforementioned stable of autodensing concrete almixture.For this reason, in conjunction with relevant existing Research foundation, the present invention is by a large amount of practice, for science, the quantitative evaluation difficult problem of CRTSIII plate-type track filling bed with autodensing concrete almixture stability, test unit and the method for the corresponding autodensing concrete almixture stability of a kind of test evaluation are invented, thus ensure the high-quality construction of filling bed self-compacting concrete, guarantee ballastless track of high-speed railway structure military service performance and operation security.
List of references:
[1] Long Guangcheng. self-compacting concrete. Chinese railway science publishing house, 2013.7.
[2] the provisional technical conditions of high-speed railway CRTSIII plate-type ballastless track filling bed self-compacting concrete [the total science and technology 2013 (125) of iron], China Railway Press, 2013.
[3] Chinese invention patent: self-compacting concrete filling performance testing device (ZL201010229119.8).
Summary of the invention
First technical matters to be solved by this invention be to provide a kind of can the stability of test evaluation autodensing concrete almixture fast and accurately, ensure the filling bed self-dense concrete mixture stability testing device of self-compacting concrete filling layer construction quality.
Second technical matters to be solved by this invention is to provide a kind of method of testing of this filling bed self-dense concrete mixture stability testing device.
In order to solve upper first technical matters, filling bed self-dense concrete mixture stability testing device provided by the invention, be made up of a support, top layer paste thickness tester and cylindrical drum three part, described cylindrical drum is placed in the bottom center of described support, fix with securing member in the hollow tubing conductor that described top layer paste thickness tester is in the center being vertically arranged on described support directly over described cylindrical drum, after unclamping described securing member, described top layer paste thickness tester can along described support slide downward.
Described top layer paste thickness tester is made up of center-pole with a scale and 4 blades, blade described in 4 is fixedly installed in the lower end of described center-pole, the adjacent described mutual layout in 90 ° of blade, the bottom of described center-pole is radially concordant with the bottom of described blade, and described center-pole is sleeved in described hollow tubing conductor.
Blade described in 4 is welded in the lower end of described center-pole.
Described blade and described center-pole form by stainless steel.
Described center-pole is the stainless steel cylindrical bar of diameter Ф 5mm, length 180mm, and round bar top is with scale, and minimum scale is 1mm; The physical dimension of described blade is long 75mm, wide 10mm, thickness 1mm.
Described support is three-legged support.
Described three-legged support adopts stainless steel material to make, 3 pin become 120 ° of layouts, the height of described three-legged support is 250mm, between three stent foots of described three-legged support, lower horizontal distance is 300mm, upper level distance for 100mm, and the center upper portion of described three-legged support arranges that aperture is Ф 6mm, length is 20mm hollow tubing conductor.
Described cylindrical drum is stainless steel cylindrical drum, and the physical dimension of described stainless steel cylindrical drum is cylinder internal diameter is Ф 200mm, highly for 110mm, wall thickness are 2mm.
Described securing member is bolt.
In order to solve above-mentioned second technical matters, the method for testing of filling bed self-dense concrete mixture stability testing device provided by the invention, step is as follows:
(1), by top layer paste thickness tester be installed on support central authorities, then loaded in cylindrical drum by concrete mix sample continuous uniform to be measured good for mixing, the upper surface of concrete mix sample to be measured is 8mm ~ 12mm from cylindrical drum coboundary;
(2), adjustment top layer paste thickness tester, make bottom its center-pole and the upper surface of blade bottom just contact measured concrete mix sample, read and records center bar and intersection, hollow tubing conductor upper end scale reading L1 simultaneously;
(3), after concrete mix sample loading cylindrical drum to be measured leaves standstill 15min, loosening fasteners reads the coboundary intersection scale reading L2 of center-pole and hollow tubing conductor in making the center-pole of top layer paste thickness tester along hollow tubing conductor free-falling to concrete mix sample to be measured after 30s;
(4), autodensing concrete almixture stability index and top layer layer of slurry thickness: L=L2-L1; When mixture stability index L is not more than 7.5mm, having good stability of evaluation autodensing concrete almixture.
Adopt filling bed self-dense concrete mixture stability testing device and the method for testing thereof of technique scheme, catch the self-compacting concrete filling layer surface quality state after the problem-build of self-compacting concrete filling layer construction quality core the most, surface quality is directly connected to the adhesive property between filling bed and precast track plate, top layer layer of slurry thickness has directly reacted the stability of autodensing concrete almixture, the stability of mixture is good, filling bed homogeneity after then building is good, and top layer layer of slurry thickness is little.Adopt the autodensing concrete almixture stability test evaluating apparatus of technique scheme, first top layer paste thickness analyzer is installed on three-legged support central authorities, then concrete mix sample continuous uniform is loaded in stainless steel cylindrical drum, mixture height is about 100mm (upper surface is about 10mm from cylindrical drum coboundary), then mixture upper surface is contacted bottom the center-pole of top layer paste thickness analyzer with blade bottom, after mixture loading cylindrical drum leaves standstill 15min, open duct valve by top layer paste thickness instrument center-pole along conduit free-falling in mixture, top layer paste thickness analyzer to sink in mixture after 30s, test center's bar drop, top layer paste thickness is represented with this.
The present invention with China's mass rapid railway construction for background, solve the technical barrier existed in high-speed railway plate type ballastless track structure filling layer or the quality control of similar structures self-compact concrete in construction, guarantee that self-compacting concrete filling layer (or similar structures) construction quality after pouring construction and military service performance meet design requirement.
The science of proving installation, validity and with the comparing of existing method of testing:
This device is the actual features of the horizontal plank frame based on ballastless track of high-speed railway structure filling bed, and the construction technology of self-compacting concrete is poured into a mould in conjunction with actual field, investigated and shop experiment by a large amount of engineering site, to simulate in the static condition of the autodensing concrete almixture after actual having built and this standing process the relative motion state up and down (stability of mixture) of aggregate and slurry in mixture in filling bed, the layer of slurry thickness with the autodensing concrete almixture top layer under filling bed simulated condition tested by design top layer paste thickness analyzer, thus after grasp pouring construction to initial set the relative motion state up and down of aggregate and slurry and stability in filling bed self-compacting concrete in this time period, reasonable assessment build after self-compacting concrete filling layer quality, thus this device has significant rationality and science.Simultaneously, this device is compared with the method such as wet screening, jumping table method, infiltration method of original evaluation autodensing concrete almixture stability, reflect the stability of autodensing concrete almixture in airtight horizontal thin layer structure and homogeneity more targetedly, the overall homogeneity of accurate evaluation filling bed self-compacting concrete.Thus, this device has stronger specific aim, compensate for the deficiency in existing method of testing, science, exactly assessment can be used for the workability of the autodensing concrete almixture of CRTSIII slab track filling bed, for the quality control on construction of CRTSIII slab track self-compacting concrete filling layer provides powerful support.
The susceptibility of proving installation:
Practice shows, the test evaluation susceptibility of this device to autodensing concrete almixture stability is high.Testing the parameter such as super plasticizer, water consumption by changing appreciable impact autodensing concrete almixture performance, reaching and changing autodensing concrete almixture performance, compare the stability of autodensing concrete almixture under different condition.This device to test result is adopted to show, the stability of autodensing concrete almixture is by its additive, water consumption sensitive, particularly there is good corresponding relation in the stability parameter of autodensing concrete almixture and its slump flow test, T50 time, demonstrates the validity of this device to test evaluation method further.
Advantage of the present invention and good effect:
1, the inventive method can objective, exactly test obtain the stability of autodensing concrete almixture for CRTSIII slab track filling bed, thus accurately reflect the quality on the self-compacting concrete filling layer top layer after building and overall homogeneity, guarantee the adhesive property between filling bed and its top precast track plate;
2, this method (device) can be used for laboratory or the site operation performance test evaluation of high-speed railway plate type ballastless track filling bed or similar horizontal layer structural elements autodensing concrete almixture stability, advantageously ensures the construction quality of this kind of special component;
3, the inventive method (device) is simple to operate, and reliability is high; The mixture amount that test needs is few; Avoid a large amount of human and material resources needed for on-the-spot entity full scale model test.
In sum, the present invention be a kind of can the stability of test evaluation autodensing concrete almixture fast and accurately, ensure the construction quality of self-compacting concrete filling layer and structure is simple, the autodensing concrete almixture stability experiment test device of dependable performance and evaluation method.
Accompanying drawing explanation
Fig. 1 is high-speed railway plate type ballastless track structural shape schematic diagram.
Fig. 2 is schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
See Fig. 2, filling bed self-dense concrete mixture stability testing device, be made up of a three-legged support 1, top layer paste thickness tester 2 and stainless steel cylindrical drum 3 three part, three-legged support 1 adopts stainless steel material to make, 3 pin become 120 ° of layouts, the height of three-legged support 1 is 250mm, between three stent foots of three-legged support 1, lower horizontal distance is 300mm, upper level distance for 100mm, and the center upper portion of three-legged support 1 arranges that aperture is Ф 6mm, length is 20mm hollow tubing conductor 6, the physical dimension of stainless steel cylindrical drum 3 is cylinder internal diameter is Ф 200mm, be highly 110mm, wall thickness is 2mm, stainless steel cylindrical drum 3 is placed in the bottom center of three-legged support 1, top layer paste thickness tester 2 is made up of center-pole 4 with a scale and 4 blades 5, 4 blades 5 are welded and fixed the lower end being installed on center-pole 4, the mutual layout in 90 ° of adjacent blades 5, blade 5 and center-pole 4 form by stainless steel, the bottom of center-pole 4 is radially concordant with the bottom of blade 5, center-pole 4 is diameter Ф 5mm, the stainless steel cylindrical bar of length 180mm, center-pole 4 top is with scale, minimum scale is 0.5mm, the physical dimension of blade 5 is long 75mm, wide 10mm, thickness 1mm, top layer paste thickness tester 2 is in directly over stainless steel cylindrical drum 3, and center-pole 4 is vertically sleeved in hollow tubing conductor 6 and also fixes with bolt 7, and after unclamping bolt 7, top layer paste thickness tester 2 can along three-legged support 1 slide downward.
See Fig. 2, use the method for testing of filling bed self-dense concrete mixture stability testing device, step is as follows:
(1), top layer paste thickness tester 2 is installed on three-legged support 1 central authorities, then concrete mix sample continuous uniform to be measured good for mixing is loaded in stainless steel cylindrical drum 3, concrete mix specimen height to be measured is about 100mm, concrete mix sample upper surface to be measured, from the coboundary 8mm ~ 12mm of stainless steel cylindrical drum 3, is preferably 10mm;
(2) cylindrical drum of having contained mixture is placed in the bottom center of tripod, adjustment top layer paste thickness tester 2, to make bottom its center-pole 4 and the upper surface of just contact measured concrete mix sample bottom blade 5, read and intersection, the upper end scale reading L1 of records center bar 4 and hollow tubing conductor 6 simultaneously;
(3) after concrete mix sample loading stainless steel cylindrical drum 3 to be measured leaves standstill 15min, unclamping bolt 7 makes the center-pole 4 of top layer paste thickness tester 2 along in hollow tubing conductor 6 free-falling extremely concrete mix sample to be measured, reads the coboundary intersection scale reading L2 of center-pole 4 and hollow tubing conductor 6 after 30s;
(4) autodensing concrete almixture stability index (top layer layer of slurry thickness) L=L2-L1.When mixture stability index L is not more than 7.5mm, having good stability of autodensing concrete almixture can be evaluated.
Claims (10)
1. a filling bed self-dense concrete mixture stability testing device, it is characterized in that: be made up of a support, top layer paste thickness tester (2) and cylindrical drum three part, described cylindrical drum is placed in the bottom center of described support, fix with securing member in the hollow tubing conductor (6) that described top layer paste thickness tester (2) is in the center being vertically arranged on described support directly over described cylindrical drum, after unclamping described securing member, described top layer paste thickness tester (2) can the downward free-falling along described support.
2. filling bed self-dense concrete mixture stability testing device according to claim 1, it is characterized in that: described top layer paste thickness tester (2) is made up of center-pole (4) with a scale and 4 blades (5), blade (5) described in 4 is fixedly installed in the lower end of described center-pole (4), the adjacent described mutual layout in 90 ° of blade (5), the bottom of described center-pole (4) is radially concordant with the bottom of described blade (5), described center-pole (4) is sleeved in described hollow tubing conductor (6).
3. filling bed self-dense concrete mixture stability testing device according to claim 2, is characterized in that: described blade (5) and described center-pole (4) form by stainless steel.
4. filling bed self-dense concrete mixture stability testing device according to claim 2, is characterized in that: the blade (5) described in 4 is welded in the lower end of described center-pole (4).
5. filling bed self-dense concrete mixture stability testing device according to claim 2, it is characterized in that: the stainless steel cylindrical bar that described center-pole (4) is diameter Ф 5mm, length 180mm, round bar top is with scale, and minimum scale is 0.5mm; The physical dimension of described blade (5) is long 75mm, wide 10mm, thickness 1mm.
6. filling bed self-dense concrete mixture stability testing device according to claim 1 and 2, is characterized in that: described support is three-legged support (1).
7. filling bed self-dense concrete mixture stability testing device according to claim 6, it is characterized in that: described three-legged support (1) adopts stainless steel material to make, 3 pin become 120 ° of layouts, the height of described three-legged support (1) is 250mm, between three stent foots of described three-legged support (1), lower horizontal distance is 300mm, upper level distance for 100mm, and the center upper portion of described three-legged support (1) arranges that aperture is Ф 6mm, length is 20mm hollow tubing conductor (6).
8. filling bed self-dense concrete mixture stability testing device according to claim 1 and 2, it is characterized in that: described cylindrical drum is stainless steel cylindrical drum (3), the physical dimension of described stainless steel cylindrical drum (3) is cylinder internal diameter is Ф 200mm, highly for 110mm, wall thickness are 2mm.
9. filling bed self-dense concrete mixture stability testing device according to claim 1 and 2, is characterized in that: described securing member is bolt (7).
10. use the method for testing of the filling bed self-dense concrete mixture stability testing device described in claim 1, it is characterized in that: step is as follows:
(1), by top layer paste thickness tester be installed on support central authorities, then loaded in cylindrical drum by concrete mix sample continuous uniform to be measured good for mixing, the upper surface of concrete mix sample to be measured is 8mm ~ 12mm from cylindrical drum coboundary;
(2), adjustment top layer paste thickness tester, make bottom its center-pole and the upper surface of blade bottom just contact measured concrete mix sample, read and records center bar and intersection, hollow tubing conductor upper end scale reading L1 simultaneously;
(3), after concrete mix sample loading cylindrical drum to be measured leaves standstill 15min, loosening fasteners reads the coboundary intersection scale reading L2 of center-pole and hollow tubing conductor in making the center-pole of top layer paste thickness tester along hollow tubing conductor free-falling to concrete mix sample to be measured after 30s;
(4), autodensing concrete almixture stability index and top layer layer of slurry thickness: L=L2-L1; When mixture stability index L is not more than 7.5mm, having good stability of evaluation autodensing concrete almixture.
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