Assessing low shear viscosity as the new bitumen softening. Astm d7496 18 standard test method for viscosity of. Standard test method for kinematic viscosity of asphalts. Bitumen properties the bitumen sample from athabasca has api gravitiy of around 8. Tests applied on bitumen procedure of tests on asphalt. Exp 8 penetration test of bitumen civil engineers pk.
To determine the viscosity of bitumen by tar viscometer. 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. Viscosity grade of bitumen are categorized according to viscosity degree of fluidity grading. To determine the viscosity of bitumen using tar viscometer apparatus. For instruments that offer automation, the results of a 3min integration shall be acceptable. The sample bitumen 6070 penetration grade was obtained from dantata and sawoe asphalt plant, this binder has been commonly been used in nigeria.
Tap water or a combination with the external tamson. Standard test method for viscosity of asphalts by vacuum. At the application temperature, this characteristic greatly influences the strength of resulting paving mixes. 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. As per the specifications there are four grades vg10, vg20, vg30, and vg40. D92 test method for flash and fire points by cleveland open cup tester. A basic introduction to rheology rheology and viscosity introduction rheometry refers to the experimental technique used to determine the rheological properties of materials.
This viscosity grade bitumen is mostly used in spraying applications such as paving in cold regions. Click here to visit our frequently asked questions about html5. Pdf viscosity as a possible supplement to the empirical tests of. Viscosity grade of bitumen orinoco oil corporation, s. Viscosity denotes the fluid property of the bituminous material and it is a measure of resistance to flow. Its defined as fluid property of the material as resistance to flow aim. The present work investigated the properties of the commonly used butimen for road construction in nigeria 6070 pen.
The higher the viscosity of the bitumen more time will be required for a quantity to flow out. Specified test which is used only to measure the viscosity of liquid bituminous material. Viscosity test for cutback bitumen the constructor. Impact of climate change on rheological properties of bitumen. Determination of the viscosity of bitumen or mortar measured by the. D341 practice for viscositytemperature charts for liquid petroleum products. Pdf physical properties of agbabu and yegbata bitumen in. Viscosity grade bitumen asphalt is a standard grade bitumen usually used as a paving. Tar viscometer with 4mm and 10mm orifices the apparatus consists of main parts. Viscosity grades bitumen are categorized according to viscosity degree of fluidity grading.
Viscosity grade bitumen is specified by astm standard d338109 and aashto m22680 2008. Viscosity of asphalts by vacuum capillary viscometer. The bitumen is placed in to a standard tar viscometer or efflux viscometer and its temperature. There are several ways to determine the specific gravity of asphalt on all these methods, is archimedes law. Vg 10 is an alternative for bitumen 80100 penetration grade. A manual viscosity bath is used for the measurement of bitumen. Test results showed that the specific gravity for the bitumen sampleswas 1. Viscosity is one of the most important parameter to describe the flow behavior of the binder. Viscosity reduction of heavy oilbitumen using micro and. 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. Standard test method for viscosity determination of. If viscosity of bitumen is higher, compactive effort of bitumen reduces and heterogeneous mixture arises.
In this experiment, we aim to determine the viscosity of bitumen. The results are very sensitive to test conditions and bitumen specimen preparation and the requirements of the appropriate standard must be rigidly adhered to. Material is heated to 20c above the test temperature and material is allowed to cool. Various lab tests on bitumen for pavement construction. 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. 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. To determine the bitumen resisting for penetration. Prismatic samples with suitably large dimensions enable tensile retardation tests to measurement the viscosity of bituminous binders as well as the. Tar viscometer, cup, valve, receiver, thermometer etc. By definition, the specific gravity of bitumen, the tar. Asphalt is also known as bitumen, is a sticky, black and highly viscous liquid or semisolid form of. Viscosity bitumen bitumina a global bitumen company.
Bitumen is an essential component of any pavement and is used widely throughout the world. Saybolt furol viscosity test is used to determine viscosity of liquid bitumens. 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. Viscosity grade bitumen asphalt aashto designation. 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. Do store at the temperature specified for the particular grade. Lecture 5b grading of bituminous materials quality control. Kinematic viscosity of asphalts bitumen astm d2170 eniso 12595 cooling fluid can be pumped through the cooling coil inside the apparatus. Viscosity is the property of bitumen which influences the ability of bitumen to spread, penetrate into the voids and also coat the aggregates. 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. 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. The time is measured for a fixed volume of liquid to flow under gravity through the capillary of a. Viscosity grade bitumen, bitumen vg 20, vg 30, vg 40.
That is it influences the fluid property of bitumen. To determine the viscosity of bitumen by tar viscometer as per. 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. Low or high viscosity during compaction or mixing has been observed to result in lower stability values. Your browser does not currently recognize any of the video formats available. At high fluidity or low viscosity, bitumen binder simply lubricates the aggregate particles instead of providing an uniform film thickness for binding action. The torque value is then changed using calibration factors to yield the viscosity of the bitumen. The following testing equipment is needed to measure absolute viscosity of viscosity graded paving bitumen is. It may be necessary to apply a form factor to yield the actual dynamic viscosity at the test temperature. 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. Modified asphalt binders or asphalt binders that have been conditioned or recovered are typically nonnewtonian under the conditions of this test.
1215 1287 935 1353 298 1418 507 1254 345 782 918 752 1515 710 1219 974 339 152 229 1043 1240 452 431 620 1134 491 1128 1407 564 943 1231 1038 380 750 1002 1442 759 1226 1150 725 290 559 1097