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Fig. 2: On-site wet-mix batching setup the shotcrete receiving surface is ready to start Some of the other benefits include saving on shooting on the day we pull in with the equipment, raw materials. A concrete truck will often turn we can typically set up the truck, silo, and exca- around with hundreds of dollars of material that vator, then have the silo filled and aggregate you paid for because you either over-ordered to deliveries made, then calibrate and start shooting ensure completion or misjudged the quantities and by 1 pm at the latest. Using this setup on larger over-ordered by accident. When the portable batch projects really relieves stress for the crew leader trucks are done with the job, you just clean the and allows him to concentrate on the job rather mixing auger and go top off the material bins on than worry about concrete deliveries. In this sce- the truck for the next job. There is never the worry nario, the excavator operator is able to monitor of getting a load of concrete that has been hydrated the raw material quantities and let the crew leader too long or is getting too hot, as none of the mate- know when more of anything is needed or make rials are mixed until you are ready to use them. the orders themselves. Just be sure to swap back Don't worry about the quality of concrete on hot and forth between nozzlemen if shooting for an days or when you have long hauls before it gets extended period of time. to you. These trucks are commonly used by the Our mixtures for the dry-mix trucks are a military and night-time highway work crews for simple concrete sand to cement ratio. The wet-mix placing high-performance concrete, and by SSG trucks are very customizable and can add all the for all of its shotcrete work. We are very happy ingredients that your mixture would need. The with how they work, the flexibility and profit- manufacturers are very eager to provide a product ability they bring to our jobs, and look forward to that will suit your specifications. Our wet-mix using them for years to come. truck has separate fine- and coarse-aggregate bins and a cement bin along with three admixture tanks. We use air-entraining and water-reducing admixtures, as well as an Acti-Gel slurry. We like Mason Guarino, Vice President the Acti-Gel because it provides many of the of South Shore Gunite Pools & benefits of fly ash. Also, when using a batch truck, Spas, Inc. (SSG), started in the using fly ash would require an extra powder pool industry when he was 14, hopper and a separate silo, while the liquid slurry learning how to install rein- Acti-Gel is just added using one of the liquid forcing bar. Since then, he has admixture tanks. worked on all phases of swim- Having about 7 years of experience operating ming pool construction. Guarino the wet-mix batch trucks, we can’t stress enough has worked full time with SSG since receiving his the importance of calibrating and checking the BS in construction management from the Went- settings regularly. There are a significant number worth Institute of Technology, Boston, MA, in of moving parts and calibration items on these 2009. Guarino currently serves on ASA’s Board trucks that can move off setting on their own— of Direction and is an ACI Certified Nozzleman. sometimes when a cobble works its way through the system or even when someone just bumps Tom Norman, Senior Production up against something. Calibrating confirms the Manager at Airplaco Equip- accuracy of the materials in the mixture to ment Company, is ASA’s achieve the desired results but it also makes you Membership Committee Chair. go through all of the moving parts to check that A member since ASA’s inception, everything is working the way it is supposed to. his goal as Chair is to bring The site-batching process makes you put your awareness of ASA’s existence hands on everything to ensure proper operation to the industry and encourage and accuracy. growth in membership. Shotcrete • Fall 2015 21


2015FallShotcreteEMag
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