The water baths are available in three different dimensions: 30, 56 and liters capacity. Digital thermoregulator and temperature display, internal and external outer case A limit switch is provided for the bottom limit of travel. The machine is supplied complete with load ring, 30 kN cap. The machine is fit with a precision strain gauge load cell and displacement transducer, both connected to the Digimax Easy to
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Yozshumuro Marshall compaction moulds All moulds are made from steel, protected against corrosion. Posted by SatyaPrasad at 1: Prior to the test, the operator can marshll travel limits for automatically ending the test. All the accessories have to be ordered separately. Marshall Stability and Flow values: The load jack, DC motor and controls are housed in an ergonomic cabinet.
All moving parts are protected with safety guard, which stop automatically the compactor when opened and the control panel is fit with an emergency stop red When the test is completed, marzhall sharpest slope of the graph is calculated. Two compaction hammers are recommended. Test reports can be instantly printed using an optional thermal printer.
Software can be used to get additional advanges described in the d below. The compaction mould assembly and hammer are cleaned and kept pre-heated to a temperature of 0 C to 0 C. The machine comprises of a robust, ashm two column bench type compression frame with adjustable upper cross beam.
The firmware allows performance of transducer calibrations and setting of up to 10 test profiles, saving data onboard. Six graphs are plotted with values of bitumen content against the values of: Least count of 0. The mixing temperature may be 0 to 0 C.
The loss of stability on immersion in water at 60 0 C. A limit switch is provided for the bottom limit of travel. The machine has built-in data acquisition with four channels dedicated to two strain gauge load cells and two potentiometric linear transducers; one of each can be used during the test. The software supports SI, Imperial and kgf unit system. Mould holder provided consisting of spring tension device designed to hold compaction mould centered in place on compaction pedestal.
Three specimens should be prepared at each trial bitumen content, which may be varied at 0. This will normally be about gm 2. Mixes with high Marshall stability values and very low Flow values are not desirable as the pavements of such mixes may be brittle and are likely to crack under heavy traffic.
Machine is capable of reversing its movement downward also. In the Marshall method each compacted test specimen is subjected to the following tests and analysis in the order listed below: The specific gravity and apparent specific gravity values of the different aggregates, filler and bitumen used are determined first.
Furthermore, the test stroke can be set at the beginning of the test with automatic stop, avoiding to overload the machine and the specimen, thus assuring the operator safety. The machine is fit with a precision strain gauge load cell and displacement transducer, both connected to the Digimax Each test requires a list of accessories depending on the type of test and on the reference standard.
The front panel is also fitted with an emergency button and two operating led: Determination of Optimum Bitumen Content: Take the sample as mentioned above, and heated to a temperature of 0 to 0 C. The main advantage of this machine is its high flexibility as a general purpose testing system, ensured by its generous dimensions which allow the placement of an Weigh into separate pans for each test specimen the amount of each size fraction required to produce a batch that will result in a compacted specimen Home To top Share.
The software includes control of machine, acquisition of load and displacement data, saving them and generating reports. To determine the stability, flow, voids, voids in mineral aggregates, voids filled with asphalt and density of the asphalt mixture by Marshall stability test. In case the mix designed does not fulfill any one or more of the design requirements, the gradation of the aggregates or filler content or bitumen content or combination of these are altered and the design tests are repeated till all the requirements are simultaneously fulfilled.
General lab — Ovens and hot plates: Let the bitumen contents corresponding to maximum density be B1, corresponding to maximum stability be B2 and that corresponding to the specified voids content Va 4.
At least three samples are prepared for each binder content. The bitumen is heated to temperature of 0 to 0 C and the required quantity of first trial percentage of bitumen say, 3. Automatic Marshall Stability Test Machine The pedestal should be installed on concrete slab so that the post marsahll plumb and the cap is level. Bruce Marshall, a former Bituminous Engineer with the Mississippi State Highway Department, formulated the concepts of the Marshall method of designing paving mixtures.
Amrshall aggregate size more than 25mm use the Modified Marshall method. The measuring system consists of a 50 kN capacity strain gauge load cell fitted to the upper cross beam and a 25 x 0.
Newer Post Older Post Home. The software accepts specimen diameter and height as an input parameter. All the design values of Marshall stability, flow, voids and VFB are checked at the Optimum Bitumen Content, with the specified design requirements of the mix.
More D In addition, Marshall stability and flow can be used to monitor the plant process of producing asphalt mixture. Marshall stability and flow may also be used to relatively evaluate different mixes and the effects of conditioning such as with water. The Marshall Test can be conducted with two different types of equipment: 1 Method A—using a loading frame with a load ring and a dial gauge for deformation or flow meter Traditional Method or 2 Method B—using a load-deformation recorder in conjunction with a load cell and linear variable differential transducer LVDT or other automatic recording device Automated Method. However, depending on the composition and behavior of the mixture, a less defined type of failure has been observed, as illustrated in Fig. As an alternative method, Marshall stability can also be defined as the load obtained, when the rate of loading increase begins to decrease, such that the curve starts to become horizontal, as shown in the bottom graph of Fig. The magnitude of Marshall Stability varies with aggregate type and grading and bitumen type, grade and amount.
In India, bituminous concrete mix is commonly designed by Marshall Method. This test is extensively used in routine test programmes for the paving jobs. The stability of the mix is defined as a maximum load carried by a compacted specimen at a standard test temperature of 6. The flow is measured as the deformation in units of 0. This test attempts to get the optimum binder content for the aggregate mix type and traffic intensity. This is the test which helps us to draw Marshall Stability vs. Specimen mould assembly comprising mould cylinders 1.