Experiments to determine the properties of Gilsonite:
The percentage of gilsonite ASH is a gilsonite properties that considered to be an important factor in the analysis of natural bitumen, ASH can be classified according to their type:
• Under 5% (suitable for color and ink industries) • Under 10% (suitable for drilling and casting) • Under 15% (suitable for construction, drilling mud, asphalt, casting and insulation) • Under 20% (suitable for construction and insulation) • Under 25% (suitable for construction and insulation) The most standard test available for natural bitumen ASH is ASTM-D3174
With the Gilsonite solubility test the pure bitumen can be obtained by using certain solvents, in such a way that bitumen is dissolved in the solvent and the impurity remains.The solvents used for this work, as well as the type of testing they have been listed below:
Moisture susceptibility is one of the causes of failure of asphalt pavements. Although all damage to asphalt pavements is not due to the presence of water, the presence of water exacerbates the failure of the asphalt, such as cracking, sloping and so on.Extreme weather reduces mechanical strength and hardness of asphalt mixtures and eventually It leads to their failure.Therefore, reducing the factors leading to the sensitivity of asphalt mixtures can have a significant impact on reducing their maintenance costs.Bitumen and sand are two of the main components of asphalt mixes. Moisture in two ways Destroys asphaltic:
1. The bonding between bitumen and mastic (mix of bitumen and filler) with coarse sand aggregate
2. Weakening of stickiness due to the presence of water
The replacement of the coating of bitumen from the surface of sand with water is called nibble.The phenomenon Nibbling depends largely on the chemical composition of bitumen and their desire to absorb each other. Therefore, the intrinsic properties of each sand and bitumen aggregate will have a great effect on the performance of asphalt pavement.Commonly used asbestos mixing techniques reduce bituminous mixing with different additives.Gilsonite is an appropriate additive that, in addition to improving the functional properties of the mixture, Available and economically better.It has been proved by various experiments that adding Gilsonite to asphalt mixtures increases their moisture resistance.Identifying hypersensitive compounds and mixtures is very important. Many experiments have been done to determine the moisture sensitivity of asphalt mixtures, including the testing of the D3173 ASTM.
softening point is the bituminous temperature resistance.The higher the smelting point means, the higher the softening temperature, so it can be used in tropical regions with high temperatures.The lower the smelting point is, the lower the temperature resistance and is more applicable in temperate and cold regions.The softening point of Gilsonite is performed using a Softening Point Tester, or manually, using both the Ring & Ball test method in both methods using the standard ASTM-D36 method to determine the softening point.
• Specific gravity
It is necessary to know the relationship between weight and mass of the product, because it is expressed as a percentage when it comes to the amount of bitumen in asphalt. In fact, the specific gravity of Gilsonite is the ratio of the weight of a given volume of Gilsonite to the weight of water as its volume at a given temperature. Specific gravity is a good tool for identifying the source of Gilsonite.. Specific gravity is measured by the laboratory equipment using ASTM-D3289 or ASTM-D70 standard method.