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2014SumShotcreteEMag

ASA President’s Message But Shotcrete IS Concrete… By Charles S. Hanskat Have you ever been asked how shotcrete such as accelerators or hydration control, and we commonly will perform in a particular application or use silica fume along with the cement, these are well-docu- exposure condition, and the answer is simply mented concrete supplements that can be and are routinely used “it’s the same as any other concrete”? I am in normal cast concrete, too. constantly running into this question in my Unfortunately, convincing the specifier or inspector of consulting practice and in reviewing tech- shotcrete’s equivalence to concrete sometimes requires a lot nical inquiries that come to ASA. Somehow, of time and effort to substantiate shotcrete’s performance. If there is a fundamental misconception by we added up all the times you and I, along with all the rest otherwise concrete-knowledgeable engineers, architects, and of the shotcrete industry, have had to make this argument in inspectors that shotcrete is a different material than concrete, e-mails, letters, reports, meetings, and phone calls, I’d bet yet we know it really isn’t. we’d find over 10,000 worker-hours and dollars were spent. We mix portland cement, sand, and gravel with water to And this is where an association like ASA has distinct initiate hydration and ultimately create hardened concrete. benefit to all of us in the industry. We can be the central Simply shooting concrete in place using high velocity does not conduit to feed this knowledge to the construction industry. change the basic properties of our materials. While it is true Many of the things we do now support this. We have a system that some of our applications require specialized admixtures, to receive, review, and answer technical inquiries. We conduct on-site seminars upon request about shotcrete. We facilitate annual seminars at World of Concrete. We answer questions at shows where we exhibit. These things help, but the basic problem of lack of shotcrete knowledge and awareness is still quite prevalent. We obviously aren’t reaching everyone in the construction world. Looking forward, some of our upcoming ASA programs will help. We are establishing a shotcrete inspector training session. The first one is to be held at World of Concrete 2015. We also recently helped fund a basic research effort in shotcrete durability evaluation. But can we do more? It would be great to get shotcrete adequately covered (or at least mentioned) in civil engineering and construction college classes, so young engineers and construction managers have at least heard some of the facts about shotcrete. Perhaps we should consider actively reaching out to engineering and architecture groups doing concrete structures, such as the American Society of Civil Engineers (ASCE), National Council of Structural Engineers Associations (NCSEA), the American Institute of Architects (AIA), state Departments of Transportation (DOTs), and contractor associations such as the Associated General Contractors of America (AGC), Associated Builders & Contractors (ABC), and the Design-Build Institute of America (DBIA) to provide shotcrete education sessions. We as an association must constantly work to improve the recognition and accurate knowledge of shotcrete to users and specifiers. If you have some ideas you’d like to share with me on ways we can achieve this, I’d welcome your comments via e-mail at CHanskat@HanskatCG.com. 2 Shotcrete • Summer 2014


2014SumShotcreteEMag
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