Apr 09, 2017 objective i to compute the ductility of a specific specimen of bitumen ii to assess the suitability of bitumen for its application in road construction. To perform ductility test on bitumen civil engineering. Apparatus required, theory, procedure, precautions, observations, reporting and recommended values of bitumen ductility is. The test is conducted at 27c and at a rate of pull of 50mm per minute. Comparison of ductility test results for different samples 4. Ductility is defined as the distance in cm, to which a standard sample or briquette of the material will be elongated without breaking. Objective i to compute the ductility of a specific specimen of bitumen ii to assess the suitability of bitumen for its application in road construction. Tensile strength and ductility of specimens can be measured concurrently with the addition of the force ductility kits.
Performance tests on bitumen and bituminous mixes vincenzo buccino pietro ferrari three levels of interpretation may be identified in this article. A briquette having a cross sectional area of 1 in 2 is placed in a tester at 77 f. The ductility can be described as the distance of elongation to which a bitumen. Theory of ductility test on bitumen the ductility test gives a measure of adhesive property of bitumen and its ability to stretch. Unless otherwise specified, the test shall be made at a temperature of. Pdf production of hard grade bitumen for using in high modulus. The only standardised method bs en 88 for measuring bitumen cohesive energy in relation to chip retention in chipseals is the vialit pendulum test used in the uk and europe. At least three determinations shall be made for each test. 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. Astm d5 astm d, 1992, astm d36 standard a, 2009, astm d1 statements b, 2008, and astm d4402 astm d, 2006, respectively. Determine ductility of bitumen and its suitability for. Read a detailed procedure of bitumen penetration test with sample data. 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.
A study on the significance of the ductility test for bitumen article in journal of applied chemistry 512. Test that can be used to measrue bitumen behavior at low up to 30c tempeature determines temperature at which bitumen reaches a cirtical temprature and cracks. Exp 8 penetration test of bitumen civil engineers pk. The bitumen quality varies with the variation in crude oil source and refining process, which often cause. Tests on bitumen there are a number of tests to assess the properties of bituminous materials.
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. To measure the ductility of a given bitumen sample. Lecture 5b grading of bituminous materials quality control. In viscosity grade viscosity test are conducted at 60 c and 5 c which represents the temperature of road surface during summer and. It is generally considered that an asphalt with a very low ductility will have poor adhesive properties and thus poor performance in service. The test, which is normally performed at ambient temperature, is believed to reflect the homogeneity of the binder and its ability to flow. Ductility test of bitumen is one of the main testes that you need to do during road construction. Faculty of civil engineering pavement laboratory ductility test introduction. The ductility test figure 1 measures asphalt binder ductility by stretching a standardsized briquette of asphalt binder figure 2 to its breaking point. Ductility tester ductility test apparatus for bitumen. Determining the ductility of bitumen civil engineering. The bureau of indian standards bis introduced paving grade bitumen specifications is. Penetration test the penetration test determines the hardness or softness of bitumen.
If the road surface can stretch a little under heavy loads, it is bound to last for a while without repairs. The instrument is designed and made as per the national standard gbt 4508 test methods for ductility of petroleum asphalt, and t0605 asphalt ductility test in the industry standard jtj052 specification and test methods of bitumen and bituminous mixture for highway engineering. Ductility test report report the average of three normal tests as ductility of the sample, provided that. Note 2the precision statement for ductility, as presented in fig. The ductility test is used to describe the ductile and tensile behavior of bituminous binders. The ductility test is measure of cohesiveness and elasticity of the bitumen. For this purpose, polymermodified bitumen 255555 a and 104065 a from different manufacturers were analyzed using the softening point ring and ball, penetration, force ductility and elastic recovery tests. A steel blaque coated with 0,5 mm bitumen is slowly flexed and released tempeature of the plaque is reduced at 1c per minute until bitumen cracks 25.
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. Bitumen is binder of pavement construction, which binds from ductility thin films around the aggregates. Defintion the ductility of bituminous material is the distance in centimeters to which it will elongate before breaking when a briquette specimen of the materials is pulled at a specified speed and at specified temperature. To determine the suitability of bitumen for its use in road construction apparatus. Ductility of bitumen at a temperature of 25 c drops sharply when recycled.
The stretched distance in centimeters at breaking is then reported as ductility. Aug 19, 2016 ductility testing of bitumen by astm and custom methods in one unit august 19, 2016 august 15, 2016 sophie bryant leave a comment ductility is defined as the ability to undergo great deformation or elongation in testing terms, it is the distance in mm which a standard sample of bitumen may be elongated to before breaking, when stretched at. Bitumen road construction consists of various steps such as preparation of base course, application of bituminous coat, placement of bituminous mix, rolling and check for quality etc. Many tests are done to ensure the quality of bitumen. The bitumen sample is heated and poured in the molds assembly placed on a plate. It is generally considered that an asphalt with a very low ductility will have. Ductility test of bitumen 22 jan 2018 1 apr 2018 aim. Ductility test ductility is the property of bitumen that permits it to undergo great deformation or elongation.
Exp 11 ductility test on asphalt civil engineers pk. Viscosity grade bitumen is categorized according to viscosity. Apparatus required, theory, procedure, precautions, observations, reporting and recommended values of bitumen ductility. Astm d117, standard test method for ductility of asphalt materials. Theoretical introduction bitumen emulsion is defined as a heterogeneous system comprising two or more liquid phases, a continuous phase, water, and, at least, a second liquid phase, bitumen, dispersed as droplets. Dimension of the briquette thus formed is exactly 1 cm square. Standard test method for ductility of asphalt materials. The aggregates were tested for impact value, crushing value, abrasion, water absorption and specific gravity. A library of the relevant papers will be compiled in. An alternative to the penetration test for checking the consistency of bitumen, is the ring and ball softening point test. Make at least three determinations at points on the surface of the sample not less than 10mm apart and not less than 10mm from the side of the dish. What is the importance of the ductility test of bitumen.
The ductility test astm dll3 measures the distance a standard asphalt. D 186related theory ductility test on asphalt, ductility. 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. Learn about ductility testing and the material testing solutions we provide for ductility testing.
Ductility test apparatus conducts ductility tests of bituminous materials to measure the elongation of a binder specimen before failure. Bitumen which has acceptable ductility is more resistant to thermal cracking in low temperatures and shows good adherence so, could perfectly coat aggregates. 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. When a lowtemperature ductility test is desired, the test should be run at a temperature of 39. Definition softening point is the temperature at which the substance attains a particular degree of softening under specified conditions of test. Combining values from the two systems may result in nonconformance with the standard. This test method describes the procedure for determining the ductility of a bituminous material measured by the distance to which it will elongate before. Ductility is the property of bitumen that permits it to undergo great deformation or elongation. Certain additives or blend of additives called as bitumen modifiers can. 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. The instrument for measuring the hardness of bitumen.
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. The temperaturevsstiffness relationship of bitumen is dependent on the source of crude oil and the method of refining. This test is done to determine the ductility of distillation residue of cutback bitumen, blown type bitumen and other bituminous products as per is. To determine the ductility of distillation residue of cutback bitumen, blown type bitumen and other bituminous products as per is. Analysis of available data for validation of bitumen tests bitval. There are many tests which are conducted to check the quality of bitumen. Jun 17, 2016 the ductility test gives a measure of adhesive property of bitumen and its ability to stretch. Concepts used for development of bitumen specifications.
Astm d1 17 standard test method for ductility of asphalt. Critical problems with using the asphalt ductility test as a. It composes 87% carbon, 11% hydrogen and 2% oxygen by weight. Tests applied on bitumen procedure of tests on asphalt. Cutback asphalt is a liquid asphalt which is a blend of asphalt and.
The ends of a molded specimen are pulled apart in a liquidfilled trough at specified speed and temperature. In flexible pavement design, it is necessary that binder should form a thin ductile film around. Pdf physical characterization and temperature susceptibility of. Standard test method for ductility of bituminous materials. Bitumen quality and manufacturing processespast and present. Bitumen quality aspects in view of huge expenditure involved in the construction of new roads and maintenance of the existing road network, the quality considerations of bitumen have become a subject ofinterese4. Bitumen is very important component of many construction sites like roads, highways. Improving quality and durability of bitumen and asphalt.
Ductility is defined as distance in cms to which a standard briquette of bitumen can be stretched before the thread breaks. Standard ductilometer for ductility test ductimeter. The scope of this test is to provide a method for determining the consistency of semisolid and bituminous materials in which the sole or major constituent is either bitumen or tar pitch. Bitumen is a black or brown mixture of hydrocarbons obtained by partial distillation of crude petroleum. 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. 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. The experimental work was carried out to perform the marshall stability test on the prepared bitumen samples. A fundamental problem with the test method, however, is that the configuration of the test specimen holder. Dec 08, 2016 this test is done to determine the ductility of distillation residue of cutback bitumen, blown type bitumen and other bituminous products as per is.
Determine ductility of bitumen and its suitability for road. Ductility test on bitumen measures the distance in centimeters to which it elongates before breaking. To obtain the ductility value of bituminous sample. Melt the bitumen to be tested to a temperature of 75 to c above its. A study on the significance of the ductility test for bitumen. The existing surface is prepared by removing the pot holes or rust if any. Ductility test is no longer mandatory for specification compliance. Nado rinchen dhendup tashi pemba tshering rigesh lama rohit adhikari. Various laboratory tests on bitumen is conducted to check quality and different properties of bitumen for pavement construction. Ductility values ranges from 0 to over 150 depending on the type of bitumen.
The precision of tests on residues, such as those obtained by test methods d 1754 and d 2872. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value. 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. Release the needle for five seconds and measure the distance penetrated. The bitumen of vg30 grade was tested for ductility, softening point, penetration test. This dish of at least 350 ml capacity is fitted with a suitable support to hold the sample container firm. 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 empirical characteristics such as penetration, softening point and viscosity and. Ductility test is conducted to determine the amount bitumen will stretch at temperature below its softening point. The ductility test astm d1 measures the distance a standard asphalt sample will. Effect of different polymermodified bitumen of the same sort.
We know that the ductility of a material is the ability of that material to undergo plastic deformation permanent deformation. The viscosity of bitumen is reduced some times by a volatile diluents this material is called cutback. The new viscosity grading system conforms to is 732006 paving bitumen specification third revision. Bitumen performance tests april 2016 nz transport agency. Test results of initial bitumen and of bitumen modified by 3 % of polyethylene and.
Critical problems with using the asphalt ductility test as. First, asphalt test, ductility test on bitumen tester introduction asphalt ductility tester is commonly used petroleum testing equipment. Penetration, softening point, ductility, rotational viscosity and storage. Ductility test this test measure the adhesive properly of bitumen and its ability to stretch. Ductility of bitumen is its property to elongate under traffic load without getting cracked in road construction works. Ductility testing apparatus, ductility testing equipment. Various lab tests on bitumen for pavement construction. Since roads involve vehicular traffic and heavy loads, they need to be built to last for a while. D117 standard test method for ductility of asphalt materials elongation test specimens asphalt. Physical performances of asphalt binders such as penetration, softening point, ductility, and viscosity were tested according to the following standards. Circular holes are made at ends known as clips to grasp the stationary. Bitumen bitumen is a thermoplastic material and its stiffness is dependent on temperature. 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.
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