GB2477432A - Roller compactor integrated to a wheel track machine for laboratory tests on bituminous mixes - Google Patents

Roller compactor integrated to a wheel track machine for laboratory tests on bituminous mixes Download PDF

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Publication number
GB2477432A
GB2477432A GB1101739A GB201101739A GB2477432A GB 2477432 A GB2477432 A GB 2477432A GB 1101739 A GB1101739 A GB 1101739A GB 201101739 A GB201101739 A GB 201101739A GB 2477432 A GB2477432 A GB 2477432A
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GB
United Kingdom
Prior art keywords
wheel
mix
disks
mould
slab
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1101739A
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GB201101739D0 (en
Inventor
Mario Mambrini
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MECPART Srl
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MECPART Srl
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Filing date
Publication date
Application filed by MECPART Srl filed Critical MECPART Srl
Priority to GB1101739A priority Critical patent/GB2477432A/en
Publication of GB201101739D0 publication Critical patent/GB201101739D0/en
Publication of GB2477432A publication Critical patent/GB2477432A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0029—Moulds or moulding surfaces not covered by B28B7/0058 - B28B7/36 and B28B7/40 - B28B7/465, e.g. moulds assembled from several parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0094—Moulds for concrete test samples
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/3697—Moulds for making articles of definite length, i.e. discrete articles comprising rollers or belts cooperating with non-rotating mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/242—Moulding mineral aggregates bonded with resin, e.g. resin concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/027—Particular press methods or systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/14—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds on a movable carrier other than a turntable or a rotating drum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
    • 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
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • 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
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • 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
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
    • 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
    • G01N3/56—Investigating resistance to wear or abrasion
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/42—Road-making materials

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Immunology (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)

Abstract

The apparatus is adapted to produce mixes of bitumen for road paving and then to test the bitumen for deforming effects generated by tyres rolling on a road. A mould containing the mix is closed by a slab C which is pressed onto the mix by discs A acting on the extensions B of the slab C. After forming the sample G the slab C is removed and a central wheel F is lowered to engage the surface of the sample.

Description

TITLE: ROLLER COMPACTOR INTEGRATED TO A WHEEL TRACK
MACHINE FOR LABORATORY TESTS ON BITUMINOUS MIXES
DESCRIPTION
FIELD OF THE INVENTION
The present invention refers to the experimental field of the bituminous mixes for road paving, and, more specifically, to the machines adapted to the laboratory manufacturing of controlled compaction slabs for executing on them wheel tracking tests or to be cut in elements adapted to advanced tests.
The viscoelastic and thermoplastic behaviour of the bituminous mixes exposes the outer layers of the road flexible paving to the risk of being permanently deformed (wheel trackings) due to the action of the heavy transport in the areas which are more subjected to the tyres rolling, this effect is augmented by an environment temperature rise.
Such deformations impair the smoothness of a road, and therefore the safety of the vehicles running on it.
For characterising the deterioration, the phenomenon of the permanent deformations is studied by road simulators or wheel track machines, capable of reproducing on a reduced scale and under predetermined test conditions, the action of the vehicle load (rolling wheel) The specimen under test can be directly taken from the p The specimen under test can be directly taken from the road or can be manufactured, in a laboratory, with a slab shape.
For obtaining this slab with the same mechanical characteristics of the paving to be designed, it is necessary another machine, known as "roller compactor", simulating the rolling made in a construction site on the spreaded bituminous mix.
The manufactured slab is also used for other objects: by suitably trimming it, it is possible to obtain specimens adapted to dynamic tests for determining the constitution properties of the material and its fatigue resistance.
The experimental laboratory dedicated to the study of road pavings requires two separate machines: one dedicated to the manufacture of the mix slab for the different tests, the other dedicated to the wheel tracking test on the slab itself.
DISCLOSURE ND ADVANTAGES OF THE INVENTION
The object of the present invention consists of unifying the above mentioned machines.
In brief, the invention consists of an architecture adapted to obtain a single machine having two operations.
The invention refers to a way for integrating two separate machines used in an experimental laboratory which studies bituminous mixes for road paving. Such machines are known respectively as "roller compactor" and "wheel track machine"; the first is for manufacturing controlled-compaction mix slabs, the second for simulating, on a reduced scale, the deforming effect generated by tyres rolling on a road. The reference regulations are EN 12697-33 and EN 12697-22 respectively.
A regulated variant of the roller compactor provides a suitably loaded idle metal cylinder alternatively sliding on a row of slabs freely reciprocally translating in a vertical direction, guided by a.
container containing the mix. These slabs form a flexible interface adapted to transmit shearing stresses to the mixture contained in the mould.
A regulated variant of the wheel track machine comprises a suitably loaded idle wheel horizontally reciprocally sliding on the mix surface for forming a tracking on it, whose depth is the measure to be studied.
The invention comprises the substitution of the conventional cylinder of the compactor with two facing disks located at a distance greater than the size of the mould and the application of two side projecting extensions to the slabs, in order to form sliding tracks of said disks. This arrangement consists of housing between the two disks the wheel dedicated to the wheel tracking. This wheel can be driven to the mix surface once the slabs have been removed, since the distance between the disks is greater than the mould width.
In this way, all the handling, loading, control, and measuring devices are available both for the compaction and the wheel tracking.
The advantage brings about a substantial cost reduction for a laboratory. The measuring and control devices necessary for the wheel tracking operation are also available for the roller compactor, which can also be controlled for performing specific experimental procedures which are not expressively anticipated in the reference regulation.
Said object and advantages are all met by the machine object of the present invention, which is characterized for what it is claims in the attached claims.
0 *. 5
BRIEF DESCRIPTION OF THE DRAWINGS
The attached drawings, as an exemplifying non limiting example, are the reference for the following
description; in particular:
-Figures 1, 2 and 3 show examples of the prior art; -Figure 4 shows the machine of the invention.
PRIOR ART
Referring to the wheel track machine, the EN 12697-22 regulation describes the different possible arrangements and the associated test modes. The more common arrangement, as shown in Figure 1, provides a test room at a controlled temperature, receiving a device (A) generating a constant load on a freely rotating tired wheel (8) around its horizontal axis. Said wheel abuts on the sample (C) which in turn is subjected to cyclical movements along a rectilinear and horizontal path (D) The depth of the tracking formed by the specimen surface after a predetermined number, of passes provides the expected measurement (E) Regarding the roller compactor, the reference regulation EN 12697-33 lists different approaches; the more simple approach, Figure 2, provides the mix (A) inside a mould (B) upwardly closed by a sector of a cylinder (C), on the cylinder rotation axis acts the load device (D). The sector is moved with a pendular motion dragged by the alternative rectilinear motion (E) received by the mould.
The compacting action on the mix is the same as the one performed by a road roller moving backwards and forwards on the spreaded bituminous mix.
The problems of this arrangement are different.
First of all, the cylinder sector does not need to move along the whole mouth of the mould, so it leaves at the ends of the travel a space sufficient for the grains possibly ejected by the mixture; the result is a slab having two edges which are not suitably compacted.
Secondly, the cold surface of the cylinder sector lowers the mix temperature and, consequently, lowers the mobility of the binder inside the contact layer, in this way it increases the non homogeneity in the product.
The regulation itself offers a valid alternative for avoiding said disadvantages, by outlining a flexible interface between the roller and the mix (as shown in Figure 3) There is a pack of metal slabs (A) vertically arranged to close the mould (B) and which can freely reciprocally translate guided by the walls of the latter.
Such system avoids the ejection of the mix grains (C), by allowing the roller (D) to follow the whole path on the slab series when it is performed the movement (E) I. It and, therefore, to subject the whole sample to the effect of the load produced by a jack (F) The slabs pack can then be pre-heated with the mould to the temperature of the mix, in order to have a closed container at a high heat inertia for making negligible the cooling of the bitumen during the compaction.
DESCRIPTION OF THE INVENTION
Figure 4 shows a schematic view of the machine of the invention and substantially illustrates the invention, which consists in an arrangement adapted to obtain a single machine having two operations.
The cylindrical roller characterizing the machines of the prior art is formed by two coaxial facing idle disks A; two side projecting extensions B are added to the rectangular-shaped slabs equipping said machines for obtaining the C shape.
The distance between the disks is such to be greater than the side of the mould D, so that, after the removal of the slabs series and after the mix has been taken to the surface in the container, the jack E can cause the central wheel F to contact the mix surface G, while the disks freely lower besides the upper edge of the mould.
The remaining references indicate the dynamometer H, the vertically sliding guides I, the horizontally sliding guides L and the associated motor M. I. 8 The figure does not comprise the vertical displacement sensor, the power, control and driving devices, the tough frame and the thermostatically-controlled protective covering.
In brief, the slab extensions B form the sliding tracks of the disks A and therefore enable the use of the cited devices for compacting the mix slab; by removing the slabs C, it is possible to obtain the central wheel F which, with the loading, control and measuring devices, allows the wheel tracking test. P. 9

Claims (3)

  1. CLAIMS1. Integrated machine for making, in laboratory, slabs made of a controlled-compaction bituminous mix in a mould and for making wheel tracking tests on the same, the compaction step is performed by two idle disks which slide and press the side extensions of a vertical plates array overlapping the mix, the wheel tracking test is performed by a wheel located between said disks; after having removed the plates array, the wheel can be presented to the mix since the disks are located at a distance greater than the mould width.
  2. 2. Machine according to claim 1, wherein the assembly formed by the facing discs and intermediate wheel is in charge of the reciprocating translating motion, instead of the assembly formed by the mould and plates array.
  3. 3. Machine according to claim 1, wherein the plates and disks have different configurations, however they reproduce the operation principle object of the invention.
GB1101739A 2011-02-01 2011-02-01 Roller compactor integrated to a wheel track machine for laboratory tests on bituminous mixes Withdrawn GB2477432A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1101739A GB2477432A (en) 2011-02-01 2011-02-01 Roller compactor integrated to a wheel track machine for laboratory tests on bituminous mixes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1101739A GB2477432A (en) 2011-02-01 2011-02-01 Roller compactor integrated to a wheel track machine for laboratory tests on bituminous mixes

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GB201101739D0 GB201101739D0 (en) 2011-03-16
GB2477432A true GB2477432A (en) 2011-08-03

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102562909A (en) * 2011-11-23 2012-07-11 中铁三局集团有限公司 Single continuous constant-resistance generator
CN102944488A (en) * 2012-11-19 2013-02-27 长安大学 Method for testing rut resistance of multi-layered combined structure mixtures of bituminous pavements
CN103344497A (en) * 2013-06-19 2013-10-09 福州大学 Method and device for mechanical parameter test on granular aggregate roadbed
CN107764630A (en) * 2017-10-19 2018-03-06 长安大学 A kind of experimental rig for testing bituminous paving failure by shear
CN112858070A (en) * 2021-01-18 2021-05-28 江苏久祥汽车电器集团有限公司 Wear resistance testing device for automobile part die

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108387418B (en) * 2018-02-07 2024-03-15 长安大学 Full-automatic asphalt mixture uniformity testing instrument and testing method
CN109443729B (en) * 2018-12-04 2024-03-19 江苏佳世德检测技术有限公司 Test device and test method for simulating rolling of automobile

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3478572A (en) * 1968-07-12 1969-11-18 John L Mcrae Wall friction device
US5366367A (en) * 1992-05-18 1994-11-22 Koch Materials Company Compacting apparatus
US5641901A (en) * 1995-11-06 1997-06-24 Powell; Raymond Asphalt concrete sample rutting machine
US5911164A (en) * 1998-02-10 1999-06-08 Mcrae; John L. Compaction and pavement design testing machine and method for testing flexible pavement materials
JP2001165831A (en) * 1999-12-14 2001-06-22 Kajima Corp Apparatus and method for manufacturing test piece
GB2378766A (en) * 2001-08-14 2003-02-19 Ele Internat Ltd Apparatus for testing compaction of material samples
JP2009192391A (en) * 2008-02-15 2009-08-27 Kobe Univ Method and device for evaluating asphalt mixture and sample

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3478572A (en) * 1968-07-12 1969-11-18 John L Mcrae Wall friction device
US5366367A (en) * 1992-05-18 1994-11-22 Koch Materials Company Compacting apparatus
US5641901A (en) * 1995-11-06 1997-06-24 Powell; Raymond Asphalt concrete sample rutting machine
US5911164A (en) * 1998-02-10 1999-06-08 Mcrae; John L. Compaction and pavement design testing machine and method for testing flexible pavement materials
JP2001165831A (en) * 1999-12-14 2001-06-22 Kajima Corp Apparatus and method for manufacturing test piece
GB2378766A (en) * 2001-08-14 2003-02-19 Ele Internat Ltd Apparatus for testing compaction of material samples
JP2009192391A (en) * 2008-02-15 2009-08-27 Kobe Univ Method and device for evaluating asphalt mixture and sample

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102562909A (en) * 2011-11-23 2012-07-11 中铁三局集团有限公司 Single continuous constant-resistance generator
CN102562909B (en) * 2011-11-23 2013-06-12 中铁三局集团有限公司 Single continuous constant-resistance generator
CN102944488A (en) * 2012-11-19 2013-02-27 长安大学 Method for testing rut resistance of multi-layered combined structure mixtures of bituminous pavements
CN102944488B (en) * 2012-11-19 2015-04-22 长安大学 Method for testing rut resistance of multi-layered combined structure mixtures of bituminous pavements
CN103344497A (en) * 2013-06-19 2013-10-09 福州大学 Method and device for mechanical parameter test on granular aggregate roadbed
CN103344497B (en) * 2013-06-19 2015-07-01 福州大学 Method and device for mechanical parameter test on granular aggregate roadbed
CN107764630A (en) * 2017-10-19 2018-03-06 长安大学 A kind of experimental rig for testing bituminous paving failure by shear
CN112858070A (en) * 2021-01-18 2021-05-28 江苏久祥汽车电器集团有限公司 Wear resistance testing device for automobile part die

Also Published As

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