ASTM D1559 MARSHALL PDF

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.

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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. Various agencies have criteria for Marshall stability. In both types of failure, the Marshall flow is the total sample deformation from the point where the projected tangent of the linear part of the curve intersects the x-axis deformation to the point where the curve starts to become horizontal.

As shown in Fig. There is no ideal value but there are acceptable limits. 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. 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.

The binder content range is generally selected on the basis of experience and historical testing data of the component materials, but may involve trial and error to include the desirable range of mix properties.

Dense-graded mixtures will generally show a peak in stability within the range of binder contents tested. Stability, flow, density, air voids, and voids filled with asphalt binder, may be plotted against binder content to allow selection of an optimum binder content for the mixture. The above test properties may also be weighted differently to reflect a particular mix design philosophy. In addition, a mixture design may be required to meet minimum voids in the mineral aggregate based on nominal maximum aggregate size in the mixture.

This includes mixing efficiency and aging. The source of the variation should be resolved and the problem corrected. Other types of compaction may cause specimens to have different stress strain characteristics than specimens prepared by Marshall impact compaction.

Marshall stability and flow may also be determined using field cores from in situ pavement for information or evaluation. One source of error in testing field cores arises when the side of the core is not smooth or perpendicular to the core faces. Such conditions can create stress concentrations in loading and low Marshall stability. Users of this standard are cautioned that compliance with Specification D alone does not completely assure reliable results.

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.

Scope 1. This test method is for use with dense graded asphalt mixtures prepared with asphalt cement modified and unmodified , cutback asphalt, tar, and tar-rubber with maximum size aggregate up to 1 in. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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.

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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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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.

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