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2017SummerShotcreteEMag

| SHOTCRETE CORNER Shotcrete—The Blindside Waterproofing Solution By Ross King The large cities of the world are growing and being rebuilt like never before. This city rebuilding and densification is increasing below-grade construction complexity and challenges due to smaller sites, close proximity to adjacent buildings, and traffic congestion. One of the most recent and rapidly growing solutions to deal with this boom in urban basement construction is the use of structural shotcrete. A particularly efficient and economical use is in place of traditional form-and-pour concrete construction for one-sided walls built at the building perimeter against excavation shoring tight to property lines, also known as blindside wall construction. The performance demands for blindside waterproofing increase as the uses of these below-grade structures change. More buildings situated downtown are using the below-grade areas not just for parking, but for finished, occupied spaces that are far more sensitive to water intrusion (refer to Fig. 1). Add to this the boom in urban condominium construction and a resident lawyer on every condominium council, and water leaks can become very costly. A new challenge in below-grade construction is rising in cities such as Toronto and Seattle, where the city is prohibiting groundwater discharge from basement drainage systems, or imposing an expensive metered charge Fig. 1: Downtown high-rise hospital, below-grade blindside walls, with shoring rakers and densely reinforced high-strength pilasters supporting 20 floors 46 Shotcrete | Summer 2017 www.shotcrete.org


2017SummerShotcreteEMag
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