Critical problems with using the asphalt ductility test as a. Ductility tester ductility test apparatus for bitumen. Tensile strength and ductility of specimens can be measured concurrently with the addition of the force ductility kits. The first, which is the most practical, consists in identifying the limits imposed on the requisites of certain tests, performed on bitumen and its mix, as a function of the minimum and maximum. May 12, 20 while the test is in operation, it is checked whether the sample is immersed in water at depth of at least 10 mm. The test is conducted at 27c and at a rate of pull of 50mm per minute. Ductility test is conducted to determine the amount bitumen will stretch at temperature below its softening point. Determine ductility of bitumen and its suitability for road construction. In the absence of any specified variations in the test method, the test procedure as.
Various laboratory tests on bitumen is conducted to check quality and different properties of bitumen for pavement construction. When a lowtemperature ductility test is desired, the test should be run at a temperature of 39. Therefore it is important to carry out the ductility tests on bitumenous material. This test is done to determine the ductility of distillation residue of cutback bitumen, blown type bitumen and other bituminous products as per is. Mould the mould similar in design to that shown in the figure and made of brass. The ductility test gives a measure of adhesive property of bitumen and its ability to stretch.
Apparatus required, theory, procedure, precautions, observations, reporting and recommended values of bitumen ductility is discussed in this article. At least three determinations shall be made for each test. The ductility test is used to describe the ductile and tensile behavior of bituminous binders. Bitumen is a black or brown mixture of hydrocarbons obtained by partial distillation of crude petroleum. A briquette having a cross sectional area of 1 in 2 is placed in a tester at 77 f. Determine ductility of bitumen and its suitability for road. Apparatus required, theory, procedure, precautions, observations, reporting and recommended values of bitumen ductility is. The binder material not of sufficient ductility renderspervious pavement surface and leads to development of cracks. Note 2the precision statement for ductility, as presented in fig. Marshall stability is the resistance to plastic flow of cylindrical specimens of a bituminous mixture loaded on the lateral surface. Performance tests on bitumen and bituminous mixes vincenzo buccino pietro ferrari three levels of interpretation may be identified in this article. Exp 11 ductility test on asphalt civil engineers pk. The average penetration value of 3 tests of a given bitumen sample is reported.
To measure the ductility of a given bitumen sample. Ductility test apparatus conducts ductility tests of bituminous materials to measure the elongation of a binder specimen before failure. An analysis of the primary factors governing the ductility of bitumens, as determined by the well. Read a detailed procedure of bitumen penetration test with sample data. Mar 23, 2018 ductility is the property of bitumen that permits it to undergo great deformation or elongation.
It is generally considered that an asphalt with a very low ductility will have poor adhesive properties and thus poor performance in service. Consistency of a bituminous material expressed as the distance in tenths of a millimeter that a standard needle vertically penetrates a sample of the material under known conditions of loading, time, and temperature. In viscosity grade viscosity test are conducted at 60 c and 5 c which represents the temperature of road surface during summer and. The test, which is normally performed at ambient temperature, is believed to reflect the homogeneity of the binder and its ability to flow. Ductility testing apparatus, ductility testing equipment. In elastic pavement design, it is important that binder has to create a shrill ductile film round aggregates so that physical interconnecting of the aggregates is amended. Ductility is a key component of overall weldability since weld cracking is often associated with an exhaustion of available ductility. One of these is the ductility test this test was originally developed to demonstrate the good properties of fluidity andor homogeneity of the bitumen, but when this is modified with polymers, the.
The distance at which the bitumen thread of each specimen breaks is recorded in cm to report as ductility value. Ductility test on bitumen measures the distance in centimeters to which it elongates before breaking. The hotductility test simulates the metallurgical degradation that occurs during a weld thermal cycle and provides a measure of the ductility of the alloy at high temperatures. Faculty of civil engineering pavement laboratory ductility test introduction. It is generally considered that an asphalt with a very low ductility will have. Melt the bitumen to be tested to a temperature of 75 to c above its approximate softening point till it becomes fluid. Ductility values ranges from 0 to over 150 depending on the type of bitumen. This dish of at least 350 ml capacity is fitted with a suitable support to hold the sample container firm and level during testing. To obtain the ductility value of bituminous sample. Astm d5 astm d, 1992, astm d36 standard a, 2009, astm d1 statements b, 2008, and astm d4402 astm d, 2006, respectively. Ductility is defined as the distance in cm, to which a standard sample or briquette of the material will be elongated without breaking. Ductility of bitumen is its property to elongate under traffic load without getting cracked in road construction works. The bitumen sample is heated and poured in the molds assembly placed on a plate. The instrument for measuring the hardness of bitumen.
The ends band b being known as clips, and the parts a and a as sides of the mould. To perform ductility test on bitumen civil engineering. The temperature of the penetration test was 25c, the ductility tests of the binders 90a and sbs ma were. This test is done to determine the ductility of distillation residue of cutback bitumen, blown. The ductility test is a measure of the distance to which a bituminous material will elongate before breaking when two ends of a standard specimen are pulled apart at a uniform rate.
Ductility machines are used to determine the ductility of formed asphaltcement or semisolid bitumen by measuring the distance of elongation before. What is the importance of the ductility test of bitumen. The asphalt ductility test, as currently carried out in accordance to the astm d17 specification 1, is a measure of the ultimate elongation of an asphalt binder sample at a constant rate and. Ductility test report report the average of three normal tests as ductility of the sample, provided that. Physical performances of asphalt binders such as penetration, softening point, ductility, and viscosity were tested according to the following standards. Dimension of the briquette thus formed is exactly 1 cm square. First, asphalt test, ductility test on bitumen tester introduction asphalt ductility tester is commonly used petroleum testing equipment. The stretched distance in centimeters at breaking is then reported as ductility. While the test is in operation, it is checked whether the sample is immersed in water at depth of at least 10 mm. In flexible pavement design, it is necessary that binder should form a thin ductile film around aggregates so that physical interlocking of the aggregates is improved binder material having insufficient ductility gets cracked when subjected to repeated traffic. Standard test method for ductility of bituminous materials.
The ductility test is performed for determining the ductility of bituminous materials by measuring the elongation before breaking when two ends of briquette specimens are. Penetration and ductility cannot be replaced each other. Ductility test this test measure the adhesive properly of bitumen and its ability to stretch. It composes 87% carbon, 11% hydrogen and 2% oxygen by weight. Bitumen is binder of pavement construction, which binds from ductility thin films around the aggregates. The ductility test is a measure of the distance to which a bituminous material. The ductility test is performed for determining the ductility of bituminous materials by measuring the elongation before breaking when two ends of briquette specimens are pulled apart at a specified speed and temperature. There are many tests which are conducted to check the quality of bitumen. Tests applied on bitumen procedure of tests on asphalt. The ductility test figure 1 measures asphalt binder ductility by stretching a standardsized briquette of asphalt binder figure 2 to its breaking point. Penetration test the penetration test determines the hardness or softness of bitumen. To determine the suitability of bitumen for its use in road construction apparatus.
The following tests are usually conducted to evaluate different properties of bituminous materials. The ductility test is measure of cohesiveness and elasticity of the bitumen. We know that the ductility of a material is the ability of that material to undergo plastic deformation permanent deformation before the rupturing breaking of that material. The ductility of a bituminous material is defined as the distance in centimeters, to which it will elongate before breaking when two ends of a briquet specimen of the material, are pulled apart at a specified speed and a specified temperature. A study on the significance of the ductility test for bitumen. Theory of ductility test on bitumen the ductility test gives a measure of adhesive property of bitumen and its ability to stretch. The suggested method of test is covered by astm d1 and aashto t51. Tests on bitumen there are a number of tests to assess the properties of bituminous materials. Bitumen tests ductility test ductility is the property of bitumen that permits it to undergo great deformation or elongation. The ductility of a bituminous material is measured by the distance in cm to which it will elongate before breaking when a standard briquette specimen of the material is pulled. Ductility is the property of bitumen that permits it to undergo great deformation or elongation. The bitumen sample is melted to a temperature of 75 to 100 c above the approximate.
Jun 17, 2016 the ductility test gives a measure of adhesive property of bitumen and its ability to stretch. To determine the marshall stability of bituminous mixture as per astm d 1559. Ductility test the ductility test astm dll3 measures the distance a standard asphalt sample will stretch without breaking under a standard testing condition 5 emmin at 25 c. The ductility of a bituminous material is measured by the distance in cm to which it will elongate before breaking when a standard briquette specimen of the. The instrument is based on the prc standard gb t 4508 asphalt ductility test, peoples republic of industry standard jtg e202011 road asphalt and asphalt testing procedures in the t 06052011 asphalt. The new viscosity grading system conforms to is 732006 paving bitumenspecification third revision. Learn about ductility testing and the material testing solutions we provide for ductility testing. If the road surface can stretch a little under heavy loads, it is bound to last for a while without repairs. Apr 09, 2017 the ductility provides the extent of adhesive nature or the properties possessed of bitumen and its capacity to stretch. Ductility test of bitumen 22 jan 2018 1 apr 2018 aim. The viscosity of bitumen is reduced some times by a volatile diluents this material is called cutback.
Ductility test report report the average of three normal. Nado rinchen dhendup tashi pemba tshering rigesh lama rohit adhikari. Many tests are done to ensure the quality of bitumen. Standard ductilometer for ductility test ductimeter. Pdf critical problems with using the asphalt ductility. To determine the ductility of distillation residue of cutback bitumen, blown type bitumen and other bituminous products as per is. A study on the significance of the ductility test for. To determine the suitability of bitumen for its use in road construction.
The hot ductility test simulates the metallurgical degradation that occurs during a weld thermal cycle and provides a measure of the ductility of the alloy at high temperatures. Determine ductility of bitumen and its suitability for. The ductility test astm d1 measures the distance a standard asphalt sample will stretch without breaking under a standard testing condition 5 cmmin at 25 c. Determining the ductility of bitumen civil engineering portal. Melt the bitumen to be tested to a temperature of 75 to c above its. Viscosity grade bitumen is categorized according to viscosity.
An analysis of the primary factors governing the ductility of bitumens, as determined by the wellknown test, is given. Various lab tests on bitumen for pavement construction. Nov 20, 2017 since roads involve vehicular traffic and heavy loads, they need to be built to last for a while. This test method describes the procedure for determining the ductility of a bituminous material measured by. Ductility is defined as distance in cms to which a standard briquette of bitumen can be stretched before the thread breaks. Standard test method for ductility of asphalt materials. In flexible pavement design, it is necessary that binder should form a thin ductile film around. The ductility is expressed as the distance in cm to which a standard briquette of bitumen can be stretched. Ductility test of bitumen is one of the main testes that you need to do during road construction. Aim to determine the ductility of the given bitumen sample apparatus 1. Bitumen is very important component of many construction sites like roads, highways. The ends of a molded specimen are pulled apart in a liquidfilled trough at specified speed and temperature.
Sep 20, 2017 penetration test the penetration test determines the hardness or softness of bitumen. D 186related theory ductility test on asphalt, ductility. The ductility of a bituminous material is measured by the distance in cm to which it will elongate before breaking when a standard briquette. What is the procedure for the marshall stability test of. The precision of tests on residues, such as those obtained by test methods d 1754 and d 2872. Ductility test ductility is the property of bitumen that permits it to undergo great deformation or elongation. Determining the ductility of bitumen civil engineering. The ductility can be described as the distance of elongation to which a bitumen. Exp 8 penetration test of bitumen civil engineers pk.
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