ASTM D5849-07(R2020) pdf free download

ASTM D5849-07(R2020) pdf free download.Standard Test Method for Evaluating Resistance of Modified Bituminous Roofing Membrane to Cyclic Fatigue (Joint Displacement)
1. Scope
1.1 This test method determines the effect ofconstant cyclic displacement on polymer-modified bituminous membrane specimens. In this test method, a relatively low travel rate of cycling is used and the material is tested for a specified number of cycles under conditions of increased amplitude or lower temperature. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Summary of Test Method
4.1 This test method measures the ability of an unaged polymer-modified bituminous membrane material to resist deterioration during 500 cycles (Note 1) at predetermined temperature and cycle amplitude conditions. If the specimen passes the test under the selected conditions, the severity ofthe test is raised by either lowering the temperature or increasing the amplitude of the cycle, or both (see Table 1). Similarly, heat-aged specimens are subjected to 200 cycles (Note 1) under the same conditions of temperature and cycle amplitude. Test the membrane until failure or until Test Condition No. 5 is achieved. N OTE 1—Other numbers ofcycles may be used depending on the reason for conducting the test, for example, to determine the number of cycles necessary to produce failure.
5. Significance and Use
5.1 This test method provides data on classifying polymer- modified bituminous membranes by their performance related to the fatigue conditions to which they are subjected. 5.2 This test method is applicable to testing specimens consisting of a single ply of the polymer-modified bitumen material or a multiple-ply composite that includes the polymer- modified bitumen material. 5.3 This test method is conducted on both unaged and heat-aged specimens to determine the effect of heat exposure on the membrane material’s ability to resist deterioration from cyclic strain. This test method may also be conducted on specimens subjected to other laboratory exposure conditions that are not specified herein.
6. Apparatus
6.1 Any fatigue apparatus capable ofproducing cyclic strain at the selected test temperature is suitable. The apparatus shall be capable of applying sufficient load to the specimens to achieve the specified displacement. The apparatus shall be capable ofchanging cycle amplitude depending on the selected conditions. It has been found that an apparatus using a cam-driven mechanism is suitable for this purpose. The am- plitude of the cycle is altered by changing the lift of the cam. 6.2 The apparatus shall be capable of cycling the specimens at 16 mm/h [0.011 in./min]. 6.3 Two concrete slabs (Note 2), 150 by 150 by 50 mm [6 by 6 by 2 in.] minimum thickness are attached to the fatigue apparatus such that one moves continuously back and forth in relation to the other. The gap between the slabs forms the joint over which the specimen cycling occurs. Alternatively, two wooden panels 150 by 150 by 38 mm [6 by 6 by 1.5 in.] or steel plates 150 by 150 by 6 mm [6 by 6 by 0.25 in.] minimum may be used. The substrate shall be conditioned at 23 6 1 °C [73 6 2 °F] and 50 % relative humidity until the slabs, panels, or plates have reached constant moisture content. N OTE 2—The concrete slabs are molded, according to usual practice, using a mix design as follows: one part ordinary portland cement; two parts sand, 5 mm [0.2 in.] or less particle size; four parts course aggregate consisting of one third 10 mm [0.4 in.] and two thirds 20 mm [0.8 in.] aggregate size. (The water cement ratio is 0.6.) 6.3.1 The surface of the slabs to which the specimen is applied shall be that taken from the bottom of the mold. 6.3.2 Braces (metal battens) shall be attached to the sides of the slabs, panels, or plates to hold them rigid and to set the joint between the slabs during placement of the test specimens on them, and for placing the slabs in the fatigue apparatus.