ASTM D7379/D7379M-08 (R2021) pdf free download.Standard Test Methods for Strength of Modified Bitumen Sheet Material Laps Using Cold Process Adhesive.
1.1 These test methods cover the procedure for sampling and testing the strength of laps formed with adhesive used with polymer-rnoditied bituminous sheet materials.
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 nonconformance with the standard.
3. Significance and Use
3.1 These tests are useful in sampling and testing combinations of modified bitumen sheet materials used with cold- applied adhesives.
4. Sampling
4.1 From each shipment or fraction thereof, select at random a number of modified bitumen rolls and containers of adhesive in accordance with the following. Determine the number of adhesive containers to be sampled in accordance with Practice D140/DI4OM. Determine the number of rolls to be selected in accordance with Section 3. Sampling, of Test Methods D 146/ D146M.
5. Conditioning
5. 1 Condition test materials for a minimum of 4 h at 23 ± 2 °C [73.4 ± 3.6 °F] and 50 ± 5 % relative humidity before preparing specimens for testing.
6. Lap T-Peel Strength
6.1 This test method covers the determination of the T-peel strength of polymer-modified bituminous sheet material and cold-applied adhesive combinations.
6. 1. 1 Modified Bitumen Swnples for Testing—Samples for testing shall consist of two 140 by 152-mm 15.5 by 6-111.1 test panels of modified bitumen, bonded with the adhesive to be tested, and cut into 25-mm [1-in.] specimens as shown in 1. Cut the modified bitumen sheet materials and mate the sides to he bonded facing each other.
6.1.2 Sides to be bonded shall he prepared in the same fashion as a field seam is constructed with the bottom side of a top panel bonded to the top side (selvage) of the bottom panel using the adhesive to he tested.
6.2 Stir the adhesive to be tested until it is uniform. Spread 5.0 0.3 g of the adhesive evenly over the selvage portion of a bottom panel. Place the top panel over the adhesive-coated area of the bottom panel (as shown in Fig. 1) in the same manner, as a field lap would be made.
6.3 Roll the freshly prepared panel combination three times with a back-and-forth motion, taking care not to move the pancis during the rolling process. ASTM D7379/D7379M pdf download.