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Fig. 2: First layer is ready to receive its final Fig. 4: The final layer shot and cut, waiting to layer once SSD is achieved receive steel trowel finish Fig. 5: The steel troweled final finish amount of forming kept us moving fast, and Fig. 3: A core sample from the pool wall where the fact that we did not have to deal with any layering was done. Shows excellent reinforcing honeycombing or form irregularities on the bar encapsulation and no actual layers interior finish wall allowed us to not do any work twice. The layering technique allowed us shot against fresh concrete/shotcrete. A blow pipe to maintain an accurate, smooth finish that, would be used to keep the receiving surface once complete, provided an excellent look with immediately ahead of the nozzleman clean of the final coat of paint. Our shotcrete success rebound. The blow pipe would continue to be used in both the wet and dry process would not have throughout construction as the wall reinforcing been possible if it were not for the support of was No. 4 and 5 (No. 13M and 16M) bars in a 12 the American Shotcrete Association, ACI Cer- x 12 in. (300 x 300 mm) pattern with both front tified Nozzlemen, and ASA’s highly knowl- and back layers. To use the layering technique, edgeable members. the first layer of wall would be shot to just cover the first layer of reinforcing bar, leaving about 1.5 to 2 in. (36 to 90 mm) of thickness to go. Because shotcrete bonds so well to itself and other con- Mason Guarino started in the crete, using shotcrete made this process very easy pool industry when he was 14, (refer to Fig. 3). The layering technique allowed learning how to install rein- the material to be installed faster and for the fin- forcing bar. Since then, he has ishers to work with a uniform concrete material worked on all phases of swim- that set up nicely and was predictable. This ming pool construction. Gua- allowed the finishers to work roughly three times rino has been with South Shore faster than if we shot the full thickness of the wall Gunite Pools & Spas, Inc., at one time. This method also made it easier for full-time since graduating from the Wentworth the finishers to achieve a straighter more accurate Institute of Technology with his BS in construc- wall (refer to Fig. 4 and 5). tion management in 2009. Guarino currently Shotcrete was key to building a quickly serves on ASA’s Board of Direction and is an ACI executed, profitable project. The limited Certified Nozzleman. 16 Shotcrete • Summer 2015


2015SummerShotcreteEMag
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