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2015FallShotcreteEMag

hose. Furthermore, rotor pump hoses do not have vehicles. Together with a spraying arm, you can to withstand more than 1200 psi (8 MPa); there- build your own spraying system without having fore, their design does not need to be as tough as to invest a lot of money. the hoses for piston-pumped concrete. This makes Rotor pumps in general are less prone to prob- rotor pump hoses less rigid, lighter, and above all, lems when the concrete is not continuously good a lot cheaper. quality—that is, oversizes or mixture of the The technology behind a rotor machine is not aggregates. As long as the concrete is not too as sophisticated as with a pump. Maintenance and sticky (fine grain not more than 5%), a rotor operation are very easy; one worker can service machine will be able to convey it. Generally, there the equipment in less than half a day. For the is no problem if the slump is lower than typically actual shotcreting, as few as two operators per used for shooting with piston pumps. Also, there team can manage the feeding of the machine and is no need to keep pipes or hoses lubricated; thus, the shotcrete placement. no line lubricant chemicals are needed. With the relatively small dimensions of the To pump concrete with a piston pump, a higher equipment, they can be mounted on many carrier content of cement is often used for the lubrication Fig. 1: Practicing slope stabilization with wet Fig. 2: Slope stabilization with Aliva-257 in concrete in Arequipa, Perú, with an Aliva-257 Quito, Ecuador. One of the new roads leading to the new airport Fig. 3: Stabilizing rocks with wet concrete with Aliva-257. Here, the new Converto manual spraying gun is used Shotcrete • Fall 2015 27


2015FallShotcreteEMag
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