ASTM D6927 PDF
Marshall Stability and Flow of Bituminous Mixtures. Preparation of Marshall Specimens (from bituminous mixes). ASTM D PROCEDURE (continued) e. Specimens conditioned to specified temperature. All the Controls products ASTM D standard. Enter now!.
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The source of the variation should be resolved and the problem corrected. Marshall v6927 and flow may also be determined using field cores from in situ pavement for information or evaluation.
How they are Formed. Link to Active This link will always route to the current Active version of the standard. For the purpose of mix design, Marshall stability and flow test results should consist of the average of a minimum of three specimens at each increment of binder content where the binder content varies in one-half percent increments over a range of binder content.
This test attempts to get the optimum binder content for the aggregate mix type and traffic intensity. Soil – CBR loading presses: One source of error in testing field cores arises when the side of the core is not smooth or perpendicular to the core faces. This is the test which helps us to draw Marshall Stability vs. Machine is capable of astk its moment downward also. 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.
Flexible Pavement Definition and Explanation. Subscribe to our Newsletter. CBR tests on soils; Marshall tests on asphalt; uniaxial and unconfined tests on soils and rocks; compression tests on low stregth concrete, cement and groundcement What are Road Cracks?
An important feature is provided by the processing unit that controls the speed in a closed-loop modeavoiding speed calibrations and tension fluctuation effects. The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. The machine is fit with a precision strain gauge load d697 and displacement transducer, both connected to the Digimax The Marshall Test can be conducted with two different types aatm equipment: Historical Version s – view previous versions of standard.
Email The subscriber’s email address. Pre-calibrated proving ring of 5 tones capacity is fixed on the upper end of sstm machine, specimen contained in the test head is placed in between the base and the proving ring.
The 50kN capacity and fully variable speed of 0. There is no ideal value but there are acceptable limits. Home Products Search results Results for: All the accessories have to be ordered separately. The values given in parentheses astk mathematical conversions to SI units that are provided for information only and are not considered standard.
Flow meter consists of guide, sieve and gauge. Dense-graded mixtures will generally show a peak in stability within the range of binder contents tested. The load jack, DC motor and controls are housed in an ergonomic cabinet.
Least count of 0. In addition, a mixture design may be required to meet awtm voids in the mineral aggregate based on nominal maximum aggregate size in the mixture. The flow is measured as the deformation in units of 0.
The front panel is fitted with an emergency button for prompt stopping of the machine. S6927 shown in Fig. Marshall compression tester A bench mounted compression frame with motor and worm gear housed within the base unit.
ASTM D, Test equipment Controls
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.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
A limit switch is provided for the bottom limit of travel. Such conditions can create stress concentrations in loading and low Marshall stability. However, awtm on the composition and behavior of the mixture, a less defined type of failure has been observed, as illustrated in Fig. The firmware allows performance of transducer awtm and setting of up to 10 test profiles, saving data onboard.
The activating pin of the gauge slides inside the guide sleeve with a slight astk of frictional resistance.
If flow at the selected optimum binder content is above the upper limit, the mix is considered too plastic or unstable and if below the lower limit, it is considered too brittle.
Reliable results depend on many factors; following the suggestions of Specification D or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.
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General lab – Water baths: A real-time test graph and transducer data are displayed on the touchscreen.
Circulating water bath with cooler unit for Marshall. This model features a robust and compact two-column This facilitates adequate space for placing test head system after one specimen has been tested. Marshall stability and flow may also be used to relatively evaluate different mixes and the effects of conditioning such as with water.
Prior to the test, the operator can impose travel limits for automatically ending the test. Users of this standard are cautioned that compliance with Specification D alone does not completely assure reliable results. This test method is for use with dense graded asphalt mixtures prepared with asphalt cement modified and unmodifiedcutback asphalt, tar, and tar-rubber with maximum size aggregate up to 1 in. It is provided with a gear system to lift the upward direction.