Residential Building Material Reuse in Sustainable Construction
Olson, Brent David
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Social concerns about resource utilization and energy consumption have resulted in an expanding view of our common sustainable future, one that is being shaped by a growing need to improve environmental performance with an eye toward the economy. The role of residential deconstruction in reuse and recycling was examined within the broader context of material and energy conservation in sustainable development. The life cycle of residential building products was examined to identify potentially high impact opportunities to address sustainability. The service life of residential structures was estimated as 99 to 110 years through fitting Wiebull and Gompertz curves to U.S. census housing data. The service life of oriented strand board (OSB) was assumed to be the same as residential structures, and the Weibull curves for service life were used to estimate housing losses as well as an upper bound for the OSB waste stream. The estimate of the potential OSB waste stream serves to indicate that the future OSB waste stream may contain a significant volume of materials. The volume of OSB waste presents an opportunity to address material and energy conservation through reuse and recycling. Removable hollow fasteners that can deform under load may help overcome some of the barriers to reuse by providing a means to reduce bearing substrate damage and ease material separation. Hollow fasteners were subjected to shear loading in test fixtures and in lap-joints to determine fastener and joint behavior. Damage to LSL substrates resulting from joint yield was reduced when hollow fasteners buckled during joint yield. Regression techniques were used to model hollow fastener behavior as impacted by fastener diameter and wall thickness. A displaced volume method in combination with dowel bearing test results was used to model laminated strand lumber (LSL) deformation under loaded fasteners. Through application of the models, LSL lap-joints can be designed such that the primary mode of initial joint yield is due to deformation in the hollow fasteners.