The load jack produces a uniform vertical moment of 5

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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. Bulk density of the compacted specimen: weight in water divided by difference between weights in air and in water. The percent voids in mineral aggregate (VMA): percentage of void spaces between the granular particles in the compacted paving mixture and volume occupied by the effective asphalt content. Percent air voids in compacted mixture: the ratio between the volume of the air voids between the coated particles and the total volume of the mixture X 100%. Optimum binder content : the average binder content for maximum density, maximum stability and specified percent air voids in the total mix.
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Asphalt mixes properties : 1. Resistance to permanent deformation: the mix we have should have high resistance to traffic loads and especially at high temperatures. 2. Fatigue resistance: the mix should not crack/bleed under repeated loads over a period of time. 3. Resistance to low temperature cracking: Important in cold regions. 4. Skid resistance. 5. Durability: the mix should contain sufficient asphalt cement to ensure coating the aggregate particles. The compacted mix should not have very high air voids. 6. Resistance to moisture-induced damage. 7. Workability: the mix must be able of being transported, placed, compacted and finished with reasonable amount of work. 8. Low noise and good drainage properties: If mix to be used for the surface layer of the pavement structure. 1.2 Purpose: The purpose of this experiment is to prepare three marshal specimens of asphalt to check their stability and flowage. Also, the density and percentage of voids are measured in this experiment.
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Instrument Table (1) : instrument Photo Figure 1- Marshal apparatus 2- Containers 3- Gloves 4- Blinder
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3. Procedure: Three samples of coarse and fine aggregates and filler material were weighted on 4.5% bitumen (1200gm), blended, and dried in the oven at 110C. The compaction bowl and rammer were cleaned and put in the oven. Bitumen was heated at temperature 121-138C and added to the heated mix of aggregates.
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