Page 56

2017SpringShotcreteEMag

| SUSTAINABILITY the high-velocity, pneumatic application of the concrete impacting over a small area, as opposed to pouring in a form that has fluid pressure along the entire form length. There’s far less pressure at the bottom of a one-sided shotcrete form and the pressure resistance requirement is only to keep the form from moving or vibrating during the shotcrete placement. With the dramatic decrease in form pressure, forms can be much lighter and thinner than traditional form-and-pour panels. And with the need for only a one-sided form rather than a two-sided form factored in, Fig. 7: Tall, light one-sided shoot panels with pinwheeled corners and uneven base; not possible with form and pour overall formwork materials can be reduced by up to 75%. In addition, the reduction in form pressure means that details for corners, intersections, fillers, and bulkheads are easier to produce, resulting in significant material and labor savings. The decreased volume of formwork materials required on the jobsite further reduces storage needs and crane requirements. The number of forms that must be stored offsite and transported to and from the jobsite is lessened; that also reduces costs while accelerating scheduling. By reducing the amount of formwork required and thus eliminating a substantial portion of transport requirements, a shotcrete application reduces the environmental impact of a project and contributes to more sustainable construction. LABOR AND SCHEDULE SAVINGS When the quantity, size, weight, and complexity of onsite formwork are reduced, labor requirements are also minimized. The level of required labor skill is usually also lowered and this often allows skilled labor to be used in other high-demand project areas that are commonly strained during busy times. When labor requirements decrease, schedules accelerate. Schedule acceleration reduces site overhead, which results in less consumption and greater sustainability. The reduction of formwork requirements is especially advantageous in tight urban project sites. Fewer deliveries and materials onsite reduces crane time and frees up lifts for other critical operations, further contributing to schedule Fig. 8: Tall shoot panels braced from the shot side due to property line constrictions 54 Shotcrete | Spring 2017 www.shotcrete.org


2017SpringShotcreteEMag
To see the actual publication please follow the link above