This paper investigates the effect of loading level and loading rate on the damage development and strength of asphalt mixtures. Indirect tensile strength its test was conducted to analyse strength of the foamed asphalt mixes incorporating reclaimed asphalt pavement. Brewster and thomas richard henry collins and annette m. An acoustic emission ae system with eight recording channels was used to monitor the development of. Determining the flexural strength of asphalt mixtures using. Evaluation of indirect tensile test for determining. The tensile strength can be considered roughly proportional to the compressive strength and, consequently, increasing values of this parameter produces greater emissions of carbon dioxide 10. Nchrp report 530 evaluation of indirect tensile test. May 01, 2014 indirect tensile strength test on asphalt mixture sample at 20 degrees c from the asphalt institute laboratory. Evaluation of indirect tensile tests for assessing stripping.
The peak load was recorded to calculate the indirect tensile strength using eq. Indirect tensile test for the determination of the. The stress at failure generated by the load required to split a cylindrical specimen of height 95mm and of diameter 152mm at a constant displacement rate of 50. In other words, high tensile strength alone does not. Determining indirect tensile strength of compacted bituminous mixtures fop for astm d 6931. Standard test method for indirect tensile idt strength.
The fatigue life of bituminous mixes made with 80% cs and the corresponding reference limestone aggregate was measured using the indirect tensile fatigue test in controlled stress mode, reported in the only study of dawson et al. Bitumen has higher strength in compression as compared to tension. Indirect tensile test idt to determine asphalt mixture performance indicators during quality control testing in new jersey thomas bennert, edwin haas, and edward wass transportation research record 2018 2672. The indirect tensile test on asphalt concrete mixes is a frequently used procedure for assessing likely pavement performance. Evaluation of indirect tensile strength to identify. Standard test method for indirect tensile idt strength of. Comparison of semicircular bending and indirect tensile. Water will cause the binder to not adhere to the aggregate. Indirect tensile strength how is indirect tensile strength. So indirect tensile strength test idt is used to determine tensile properties of the mix which can be further be related to cracking pro. Practical method of conducting the indirect tensile test.
Model 3911 indirect tensile extensometer for asphalt, for testing per aashto tp31 and astm d4123. Mine 323brazilian tensile strength test lab 3 duration. The en 1269712 determination of water sensitivity of bituminous specimens, and en 1269723 determination of the indirect tensile strength of bituminous specimens, require a typical marshall tester fit with the indirect tensile test accessories see 76b0078b and 76b0078c devices, capable of producing a test graph. Evaluation of indirect tensile test idt procedures for low. Evaluation of indirect tensile test idt procedures for lowtemperature performance of hotmix asphalt evaluates the use of the indirect tensile creep and strength test procedures in american association of state highway and transportation officials standard method of test t32203 in mixture and structural design. Indirect tensile strength table 1 shows the influence of the test device, asphalt cement source, mix type, compaction effort, and temperature on the test results. Test result revealed that utilizing bga in asphalt emulsion mixture has proved in improving stability and indirect tensile strength.
The purpose of these tests was to study the stripping process and to evaluate the test procedure for assessing strip ping potential. The tester has a copy of the current procedure on hand. Characteristics and prediction of the low temperature indirect tensile strengths of michigan asphalt mixtures by michael krcmarik thermal cracking is the predominant flexible pavement distress in northern climates, causing transverse cracking perpendicular to the direction of traffic. Determination of the indirect tensile strength of bituminous specimens. Modulus of bituminous mixes determined by the indirect tensile test, conducted according to the en 1269726, annex c and the astm d 4123 standards. The tensile strength can be considered roughly proportional to the compressive strength and, consequently, increasing values of this parameter produces greater emissions of. This paper presents the comparison between the results of the semicircular bending scb test and that of the indirect tensile idt test in characterizing the tensile strength of hotmix asphalt. Stress strain behaviors formed a linear relationship up. This shows that for a given strain value, the fatigue life of the cs mix is higher than that of the limestone mix. The water sample is subjected to vacuum saturation, an optional freeze cycle, followed by a freeze and a warmwater cycle before being tested for indirect tensile strength aashto, 2000a 5.
This testing condition known as dry condition or unconditioned. Experimental analysis on stability and indirect tensile. This paper presents the comparison between the results of the semicircular bending scb test and that of the indirect tensile idt test in characterizing the. Indirect tensile creep tests with different loading levels and strength tests with three loading rates were performed at three low temperatures for ten mixtures. Indirect tensile modulus, creep compliance and strength using onspecimen transducers testing equipment asphalt. Evaluation of indirect tensile strength to identify asphalt concrete rutting potential. The formulas for estimating the tensile strength and poissons ratio from this test were developed by hondros 7. Evaluation of indirect tensile strength to identify asphalt. The modified lottman test basically compares the indirect tensile strength test results of a dry sample and a sample exposed to waterfreezingthawing. Kennedy research report number 9810 evaluation of tensile properties of subbases for use in new rigid pavement design research project 386698 conducted for the texas highway department in cooperation with the lt. Resistance of compacted asphalt mixtures to moistureinduced damage aashto t 283 glossary tensile strength a measure of the force required to pull apart a material. Extensometers for indirect tensile testing of asphalt.
The indirect tensile idt strength test is very useful in. The indirect tensile idt creep and strength tests were developed during the strate gic highway research program shrp to characterize the resistance of hot mix asphalt concrete hma to lowtemperature cracking 1,2. Ipc global specifications indirect tensile jig and upgrade kits. Bonaquist, evaluation of indirect tensile test idt procedures for lowtemperature performance of hot mix asphalt, nchrp report 530. Test results of indirect tensile strength indicated betterment in modifying the proprieties.
Full bridge, 350 ohm strain gaged design for compatibility with nearly any test system. Evaluation of indirect tensile test idt procedures for lowtemperature performance of hotmix asphalt evaluates the use of the indirect tensile creep and strength test procedures in american association of state highway and transportation officials standard method of test t32203 in. Evaluation of indirect tensile tests for assessing. Practical method of conducting the indirect tensile test by james n. While indirect tensile strength test at 25 c is sensitive to changes in mixture properties such as air voids, asphalt binder content, b. Effects of reclaimed asphalt pavement on indirect tensile. Investigation on tensile strength ratio tsr specimen to. The superpave mix design procedure, as implemented at the end of the strategic highway research program shrp does not include any testing to evaluate asphalt mixture for resistance to permanent deformation. Chapter 5 indirect tensile strength characteristics school of engineering, cochin university of science and technology 79 tensile strength test is an indicator of strength and adherence against fatigue, temperature cracking and rutting. Tensile strength of asphalt concrete is a function of the amount of asphalt binder in the mix, mixture stiffness, absorption capacity of the aggregates used, asphalt film thickness at the aggregate interface and total voids in the mix. Nchrp report 530 evaluation of indirect tensile test idt.
While indirect tensile strength test at 25 c is sensitive to changes in mixture properties such as air voids, asphalt binder content, binder grade, aggregate properties angularity, texture, etc. Trbs national cooperative highway research program nchrp report 530. Indirect tensile strength test on asphalt mixture sample at 20 degrees c from the asphalt institute laboratory. Evaluation of indirect tensile test idt procedures for. The hot mix asphalt hma level 1 quality control qc technician course is intended to assure an understanding of the requirements for inspection of asphalt materials at the plant, proper testing procedures, and related scdot specifications. Chapter 2 findings evaluation of indirect tensile test. Scope hma made from certain materials may be sensitive to the presence of water in the finished pavement. Determining the flexural strength of asphalt mixtures. Civil and environmental engineering, school of mining and petroleum engineering 2,2 views. Samples were tested for its after cured in the oven at 40c for 72 hours. D 6931 standard test method for indirect tensile idt strength of bituminous mixtures. Method for determination of indirect tensile fatigue characteristics of bituminous mixtures en 1269724 annex e test methods for hot mix asphalt.
A split tensile test is performed on each sample and the ratio of the indirect tensile strength of the conditioned samples is compared to the control group as a ratio. Indirect tensile test as a simple method for rut resistance. Stress strain behaviors formed a linear relationship up to strain. Caution of indirect tensile strengthonly specifications. Stiffness en 1269744 standard test methods for determination of tensile strength of fracture toughness of an.
Summary indirect tensile strength at 25 c can be a misleading property for asphalt mixtures and yet it is used sometimes to describe a mixtures performance. Astm d693117 standard test method for indirect tensile. Ipc global specifications indirect tensile jig and upgrade. The testing was performed on highperformance bituminous mixtures, including polymer modified basebinder and wearing course asphalt concretes, stone mastic asphalt and porous asphalt. Indirect tensile strength test the indirect tensile strength its of bituminous mixtures is conducted by loading a cylindrical specimen across its vertical diametral plane at 50mmmin deformation rate and 25 oc test temperature.
Fhwaltpp technical support services contractor law pcs a division of law engineering and environmental services, inc. Jul 07, 2017 mine 323brazilian tensile strength test lab 3 duration. Resistance to fatigue en 1269726 annex c test methods for hot mix asphalt. Marshallindirect tensile digital compression tester. An acoustic emission ae system with eight recording channels was used to monitor. Response behavior of asphalt mixtures at low temperatures. Currently, the indirect tensile test is most commonly used for providing information on moisture susceptibility.
The peak load at failure is recorded and used to calculate the idt strength of the specimen 8. Development of a new cracking index for asphalt mixtures. What is the significance of the indirect tensile strength. Kennedy, precision of the moisture susceptibility test method tex531c, project summary report 4909s, november 2000. The mean its was not significantly different between the two devices. Caution of indirect tensile strengthonly specifications for. Indirect tensile tests were performed on asphalt concrete mixes composed of materials common in ala bama. Indirect tensile test idt to determine asphalt mixture. Evaluation of indirect tensile strength to identify asphalt concrete rutting potential geetha srinivasan west virginia university follow this and additional works at. Tensile strength is typically used as sma performance measure for pavements. Recommended citation srinivasan, geetha, evaluation of indirect tensile strength to identify asphalt concrete rutting potential 2004.
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