To determine the viscosity of bitumen by tar viscometer. In viscosity grade viscosity test are conducted at 60 c and 5 c which represents the temperature of road surface during summer and mixing temperature. Earlier, hyne 1986 showed that the reduction of heavy oilbitumen viscosity is not only due to the high temperature effect but also a series of chemical reactions. In this experiment, we aim to determine the viscosity of bitumen. For instruments that offer automation, the results of a 3min integration shall be acceptable. Viscosity bitumen bitumina a global bitumen company. Do store at the temperature specified for the particular grade. Lecture 5b grading of bituminous materials quality control. A manual viscosity bath is used for the measurement of bitumen. Pdf physical properties of agbabu and yegbata bitumen in. At high fluidity or low viscosity, bitumen binder simply lubricates the aggregate particles instead of providing an uniform film thickness for binding action. Modified asphalt binders or asphalt binders that have been conditioned or recovered are typically nonnewtonian under the conditions of this test. By definition, the specific gravity of bitumen, the tar. It is applicable to all the emulsified asphalts specified in specifications d977 and.
The viscosity of a binder is a measure of its flow characteristics, and the performance of a bituminous mix is greatly affected by its viscosity. Bitumen properties the bitumen sample from athabasca has api gravitiy of around 8. Viscosity grade bitumen asphalt is a standard grade bitumen usually used as a paving. A basic introduction to rheology technology networks. Viscosity denotes the fluid property of the bituminous material and it is a measure of resistance to flow. There are several ways to determine the specific gravity of asphalt on all these methods, is archimedes law. Material is heated to 20c above the test temperature and material is allowed to cool. It may be necessary to apply a form factor to yield the actual dynamic viscosity at the test temperature. At the application temperature, this characteristic greatly influences the strength of resulting paving mixes. A basic introduction to rheology rheology and viscosity introduction rheometry refers to the experimental technique used to determine the rheological properties of materials. Can grade a bitumen when provided a list of parameters can choose the bitumen for the particular application knows how the grading systems were developed and knows the direction towards which. Viscosity grade bitumen is specified by astm standard d338109 and aashto m22680 2008. Viscosity is one of the most important parameter to describe the flow behavior of the binder. Impact of climate change on rheological properties of bitumen.
Viscosity grade bitumen asphalt aashto designation. Astm d7496 18 standard test method for viscosity of. Viscosity grades bitumen are categorized according to viscosity degree of fluidity grading. Bitumen is an essential component of any pavement and is used widely throughout the world. Vg 10 is an alternative for bitumen 80100 penetration grade. If viscosity of bitumen is higher, compactive effort of bitumen reduces and heterogeneous mixture arises. Experience in using bitumen in engineering projects has led to the adoption of certain test procedures that are indicative of the characteristics that identify adequate performance levels.
Assessing low shear viscosity as the new bitumen softening. The advantage of using the viscosity test as compared with the penetration test is that the viscosity test measures a fundamental physical property rather than an empirical value. Low fluidity or high viscosity does not enable the bitumen to coat the entire surface of aggregate in the mix easily and also resists the compactive effort and resulting mix is. The higher the viscosity of the bitumen more time will be required for a quantity to flow out. Determination of the viscosity of bitumen or mortar measured by the. Viscosity grade of bitumen orinoco oil corporation, s. The bitumen is placed in to a standard tar viscometer or efflux viscometer and its temperature. The torque value is then changed using calibration factors to yield the viscosity of the bitumen. Standard test method for kinematic viscosity of asphalts. The present work investigated the properties of the commonly used butimen for road construction in nigeria 6070 pen. In viscosity grade viscosity test are conducted at 60 c and 5 c which represents the temperature of road surface during summer and mixing temperature respectively.
Saybolt furol viscosity test is used to determine viscosity of liquid bitumens. Standard test method for viscosity of asphalts by vacuum. Prismatic samples with suitably large dimensions enable tensile retardation tests to measurement the viscosity of bituminous binders as well as the. That is it influences the fluid property of bitumen. The district materials coordinator will test the emulsified asphalt samples for sieve and viscosity only according to tests listed in aashto t 59, emulsified asphalts. To determine the viscosity of bitumen using tar viscometer apparatus. Pdf viscosity as a possible supplement to the empirical tests of. To determine the bitumen resisting for penetration. Viscosity test for cutback bitumen the constructor.
D92 test method for flash and fire points by cleveland open cup tester. Both the viscosity test and the penetration test measure the consistency of an asphalt at some specified temperatures and are used to designate grades of asphalts. Tar viscometer with 4mm and 10mm orifices the apparatus consists of main parts. Objectives for rp15 the objectives of the project are.
The sample bitumen 6070 penetration grade was obtained from dantata and sawoe asphalt plant, this binder has been commonly been used in nigeria. As per the specifications there are four grades vg10, vg20, vg30, and vg40. Tar viscometer, cup, valve, receiver, thermometer etc. Your browser does not currently recognize any of the video formats available. Click here to visit our frequently asked questions about html5. Tap water or a combination with the external tamson. D341 practice for viscositytemperature charts for liquid petroleum products.
Exp 8 penetration test of bitumen civil engineers pk. Test results showed that the specific gravity for the bitumen sampleswas 1. To determine the viscosity of bitumen by tar viscometer as per. Tests applied on bitumen procedure of tests on asphalt.
Its defined as fluid property of the material as resistance to flow aim. Viscosity is the property of bitumen which influences the ability of bitumen to spread, penetrate into the voids and also coat the aggregates. Specified test which is used only to measure the viscosity of liquid bituminous material. Viscosity reduction of heavy oilbitumen using micro and. Various lab tests on bitumen for pavement construction. The committee responsible for this standard is na 0620332 ga gemeinschaftsausschuss. The time is measured for a fixed volume of liquid to flow under gravity through the capillary of a. Viscosity of asphalts by vacuum capillary viscometer. The viscosity expressed in seconds is the time taken by the 50 ml bitumen material to pass through the orifice of a cup, under standard test conditions and specified temperature.
The following testing equipment is needed to measure absolute viscosity of viscosity graded paving bitumen is. Asphalt is also known as bitumen, is a sticky, black and highly viscous liquid or semisolid form of. The results are very sensitive to test conditions and bitumen specimen preparation and the requirements of the appropriate standard must be rigidly adhered to. Standard test method for viscosity determination of. Assessing low shear viscosity as the new bitumen softening point test s. Viscosity grade bitumen, bitumen vg 20, vg 30, vg 40.
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