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Sustainability This enhances sustainability because we can use less mate- rial and labor to produce the same structural element. • “Limestone Cement in Shotcrete” looked at the growing use of ground limestone “filler” as partial portland cement replacement in shotcrete mixtures. Although the amount of limestone “filler” that can produce equal durability in com- bination with lesser amounts of portland cement is being widely debated, the substitution of any amount of cement has sustainability benefits due to the reduced production of greenhouse gases associated with cement production. • “The Use of Recycled Glass in Shotcrete,” by Isabelle Fily- Paré and Marc Jolin, looked at replacement of a portion of portland cement in our mixtures with recycled glass. Cutting cement and the greenhouse gases associated with cement production and recycling glass that may otherwise go into a landfill are both factors that lead to enhanced sustainability. Take a moment to review our Top 10 list on the previous page… When you look closely, it is clearly evident that nearly everything we do with the shotcrete process is more sustainable than normal cast-in-place concrete. Shotcrete inherently creates enhanced sustainability because we have: Shoring, forming, and casting this repair would be extremely • Fewer forms, and when we use forms they create much difficult, but shotcrete makes it easy lighter construction; • Easy construction of curved or vari- able-thickness shapes, which allows maximum structural efficiency with the least amount of material; • Less heavy equipment on the job site; • Substantially less labor with the reduc- tion in formwork activities; • Less material and labor, which equates to faster completion of a given struc- tural section; and • Adaptability to nearly any repair, renovation, or repurposing of a struc- ture, which means we can substantially prolong the life of existing concrete structures with more durable shotcrete rather than require demolition and rebuilding of the structure that uses more resources. If you find yourself promoting the use of shotcrete in lieu of cast concrete on a project, pull out this Top 10 List, our ASA Sustainability brochure, or go to the shot- crete sustainability web link, shotcrete. org/pages/why-shotcrete/sustainability. htm, to prove that not only will the project have cost and time benefits but by enhancing the sustainability, you will also ultimately help preserve our world for future generations. It’s clear from everything we do as an industry: Shotcrete = Sustainability. Shotcrete • Winter 2014 57


2014WinShotcreteEMag
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