Power packed

摘要

With pneumatically applied concrete, the velocity at which the material is shot at the substrate is of great importance - the faster the better.rnToo many crews are equipped with compressors rated at pressures of less than 250 cfm, but the best I know work at 375 cfm because the higher application velocities they allow have the effect of ensuring greater encapsulation around bars - especially when there are double curtains of steel. By contrast, working at lower pressures can result in poor concrete density with greater shadowing and porosity inside the wall that will allow mix water to evaporate or bleed away.