Application of Flexi-Wall in Noise Barriers Renewal

This paper presents an experimental study on structural performance of an innovative noise barrier consisting of poly-block, light polyurethane foam (LPF) and polyurea. This wall system (flexi-wall) is intended to be employed as a vertical extension to existing sound barriers in an accelerated construction method. To aid in the wall design, several mechanical tests were conducted on LPF specimens and two full-scale walls were then fabricated employing the same LPF material. The full-scale walls were subjected to lateral loading in order to establish their lateral resistance. A cyclic fatigue test was also performed on a full-scale flexi-wall in order to evaluate the performance of the wall under a repetitive loading condition. The result of the experiments indicated the suitability of flexi-wall in accelerated construction and confirmed that the structural performance of the wall system under lateral loading is satisfactory for the sound barrier application. The experimental results were discussed and a preliminary design procedure for application of flexi-wall in sound barrier applications was also developed.

Authors:

• B. Daee
• H. M. El Naggar

Keywords:

• Noise barrier
• Polyurethane Foam
• Accelerated construction
• Full-scale experiment.

References:

[1] Y. Li, U.S. Kim, J. Shields, and R. Davis, “Controlling polyurethane
foam flammability and mechanical behaviour by tailoring the
composition of clay-based multilayer nanocoatings.” Journal of
Materials Chemistry, A, 1, 12987-12997, 2013.
[2] C. Junco, J. Gadea, A. Rodríguez, S. Gutiérrez-González and V.
Calderón, “Durability of lightweight masonry mortars made with white
recycled polyurethane foam.” Cement & Concrete Composites, Vol. 34,
pp. 1174-1179, 2012.
[3] O. Buzzi, S. Fityus and S.W. Sloan, “Use of expanding polyurethane
resin to remediate expansive soil foundations.” Canadian Geotechnical
Journal, Vol. 47(6), pp. 623-634, 2010.
[4] H. L. Schreyer and Q. H. Zuo, “Anisotropic Plasticity Model for
Foams.” Journal of Engineering Mechanics, Vol. 120, 1913-1930,
(1994).
[5] Canadian Standard Association, “CAN/CSA-G30.18-09 Carbon steel
bars for concrete reinforcement”, Mississauga, Ontario, Canada, 2009.
[6] C. L. Paul, “Is the wind wave frequency spectrum outdated.” Ocean
Engineering, Vol. 27, pp. 577-588, 2000.
[7] Canadian Standard Association, ”CAN/CSA-S6-06 Canadian Highway
Bridge Design Code.” Mississauga, Ontario, Canada, 2006.
[8] NBCC, “National Building Code of Canada”, National Research
Council of Canada (NRC), Ottawa, Canada, 2005.