Effect of Heat Aging on Properties and Structure of SBS Modified Bitumen Waterproof Membrane

Abstract:

The properties of SBS modified bitumen waterproof membrane (SMBM) will deteriorate under the action of heat. In this paper, SBS modified bitumen (SMB) and SMBM were aged at 80 °C for different times (0,10,20,30,40 days). The low temperature flexibility, softening point, viscosity and mass changes ratio of SMB and mechanical properties of SMBM before and after aging were tested, the microstructure and chemical structure of SMB were investigated by fluorescence microscope (FM) and Fourier transform infrared spectroscopy (FTIR). The results show that the low temperature flexibility, softening point and viscosity of SMB decrease significantly at the initial stage of heat aging (10 days), especially the influence of heat aging on the low temperature flexibility and viscosity of SMB is more obvious, and their properties degradation rate slowdown in the later stage of aging. The mass changes ratio of SMB first decreases and then increases with aging time. FM shows that the network crosslinking structure of SMB is destroyed gradually with the extension of aging time. The network crosslinking structure disappears after 40 days of heat aging. FTIR shows that carbonyl and sulfoxide compounds are increasing after aging, more carbonyl compounds than sulfoxide compounds are formed after aging for 10 days, and the degradation rate of SBS decreases. The maximum tension of SMBM first increases and then decreases, the elongation at maximum tension decreases with aging time.

• Periodical: Materials Science Forum (Volume 1035)
• Pages: 951-957
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1035.951
• Online since: June 2021
• Authors: Yan Heng He, Zhi Long Cao, Yang Yang Ge*, Zhao Yang Liu, Jiang Ting Li, Jian Ying Yu
• Keywords: Heat Aging, Physical Properties, SBS Modified Bitumen, Structure, Waterproof Membrane

References

[1] Hsu Y T, Wang W H, Hung W H. Architectural sustainability and efficiency of enhanced waterproof coating from utilization of waterborne poly (Siloxane-Imide-Urethane) copolymers on roof surfaces [J]. Sustainability, 2020, 12: 1-17.

DOI: 10.3390/su12114411

[2] Marques J A, Lopes J G, Correia J R. Durability of the adhesion between bituminous coatings and self-protection mineral granules of waterproofing membranes [J]. Construction & Building Materials, 2011, 25(1):138-144.

DOI: 10.1016/j.conbuildmat.2010.06.047

[3] Rodriguez I, Dutt O, Paroli R M, et al. Effect of heat-ageing on the thermal and mechanical properties of APP-and SBS-modified bituminous roofing membranes [J]. Materials & Structures, 1993, 26(6): 355-361.

DOI: 10.1007/bf02472961

[4] Wei C W, Duan H H, Zhang H L, et al. Influence of SBS modifier on aging behaviors of SBS-modified asphalt[J]. Journal of Materials in Civil Engineering. 2019, 31(9): 1-8.

DOI: 10.1061/(asce)mt.1943-5533.0002832

[5] Airey G D. Rheological properties of styrene butadiene styrene polymer modified road bitumens[J]. Fuel Guildford, 2003, 82: 1709–1719.

DOI: 10.1016/s0016-2361(03)00146-7

[6] Yan C Q, Huang W D, Lin P, et al. Chemical and rheological evaluation of aging properties of high dosage SBS polymer modified asphalt [J]. Fuel, 2019, 252: 417-426.

DOI: 10.1016/j.fuel.2019.04.022

[7] Oba K, Bjoerk F. Wind load resistance of heat-welded seams in polymer-modified bituminous roofing membrane[J]. Construction and Building Materials, 1996, 10(2): 161-168.

DOI: 10.1016/0950-0618(95)00023-2

[8] Gonçalves M, Lopes J G, Brito J D. Mechanical performance of lap joints of flat roof waterproofing membrane[J]. Experimental Techniques, 2007, 32(1): 50-57.

DOI: 10.1111/j.1747-1567.2007.00226.x

[9] Lopes J G, Correia J R, Machado M X B. Dimensional stability of waterproofing bituminous sheets used in low slope roofs[J]. Construction and Building Materials, 2011, 25(8): 3229-3235.

DOI: 10.1016/j.conbuildmat.2011.03.009

[10] Baskaran A, Katsman R, Sexton M, et al. Investigation of thermally induced loads in modified bituminous roofing membrane[J]. Construction & Building Materials, 2003, 17(3): 153-164.

DOI: 10.1016/s0950-0618(02)00109-5

[11] Xu S, Dan W, Li W Z, et al. Performance evaluation of SBS modified bituminous roofing membrane containing layered double hydroxides[J]. Key Engineering Materials, 2014, 599: 203-207.

DOI: 10.4028/www.scientific.net/kem.599.203

[12] Lin P, Yan C, Huang W, et al. Rheological, chemical and aging characteristics of high content polymer modified asphalt[J]. Construction and Building Materials, 2019, 207: 616-629.

DOI: 10.1016/j.conbuildmat.2019.02.086

[13] Zeng W, Wu S, Wen J, et al. The temperature effects in aging index of asphalt during UV aging process [J]. Construction and Building Materials, 2015, 93: 1125-1131.

DOI: 10.1016/j.conbuildmat.2015.05.022

[14] Zhang H L, Chen Z H, Xu G Q, et al. Physical, rheological and chemical characterization of aging behaviors of thermochromic asphalt binder[J]. Fuel, 2018, 211: 50-858.

DOI: 10.1016/j.fuel.2017.09.111