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 extractor for extracting the compacted specimen from the mold.
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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 extractor for extracting the compacted specimen from the mold. A suitable bar is required to transfer load from the extension collar to the upper proving ring attachment while extracting the specimen.
Compaction hammer having a flat circular tamping face 4. Mold holder is provided consisting of spring tension device designed to hold compaction mould in place on compaction pedestal. Breaking head: this consists of upper and lower cylindrical segments or test heads having a inside radius curvature of 5 cm.
Loading Machine: It is provided with a gear system to lift the upward direction. Pre-calibrated proving ring of 5 tones capacity is fixed on the upper end of the machine, specimen contained in the test head is placed in between the base and the proving ring. The load jack produces a uniform vertical moment of 5 cm per minute. Machine is capable of reversing its moment downward also.
This facilitates adequate space for placing test head system after one specimen has been tested. Flow meter consists of guide, sieve and gauge. The activating pin of the gauge slides inside the guide sleeve with a slight amount of frictional resistance. Least count of 0. The flow value refers to the total vertical upward movement from the initial position at zero loads to value at maximum load. The dial gauge of the flow meter should be able to measure accurately the total vertical moment upward.
Preparation of Test Specimen grams of aggregate blended in the desired proportions is measured and heated in the oven to the mixing temperature. The materials are mixed in a heated pan with heated mixing tools. The mixture is then placed in a heated Marshall mould with a collar and base and the mixture is spaded around the sides of the mould. A filter paper is placed under the sample and on top of the sample. The mould is placed in the Marshall Compaction pedestal.
The material is compacted with 50 blows of the hammer or as specified , and the sample is inverted and compacted in the the other face with same number of blows.
After compaction, the mold is inverted. With collar on the bottom, the base is removed and the sample is extracted by pushing it out the extractor. The sample is allowed to stand for the few hours to cool. The mass of the sample in air and when submerged is used to measure the density of specimen, so as to allow, calculation of the void properties. The specimens are removed from the water bath or oven and place in lower segment of the breaking head.
The upper segment of the breaking head of the specimen is placed in position and the complete assembly is placed in position on the testing machine. The flow meter is placed over one of the post and is adjusted to read zero. Load is applied at a rate of 50 mm per minute until the maximum load reading is obtained. The maximum load reading in Newton is observed. At the same instant the flow as recorded on the flow meter in units of mm was also noted. Stay informed - subscribe to our newsletter.
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Kazilabar 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. However, these results may not compare with results from laboratory-prepared specimens and shall not be used for speci? Typical Cross Section of Highways Roadways. Machine is capable of reversing its moment downward also. Marshall stability and flow may also be used to relatively evaluate different mixes and the effects of conditioning such as with water. Originally approved in This data involved test results from between and d testing mm 4-in. The load jack, DC motor and controls are housed in an ergonomic cabinet.
ASTM D6927 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.
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