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Members of ACI Committee 330 have questioned the applicability of ACI 117-10(15) tolerances for concrete slabs-on-ground (typically interior slabs with horizontal top and bottom surfaces) for sloped slabs-on-ground. The article discusses thickness variations evaluated for 32 slab-on-ground parking lot pavement placements. Based on the data, the authors propose thickness tolerances for adoption by Joint ACI-ASCC Committee 117 and ACI Committee 330.
Available in the following language(s): Spanish
Q.Who is responsible for coordinating construction tolerances on a project: the designer or the contractor?
Available in the following language(s): Spanish
Volume change is a challenging aspect of reinforced concrete and post-tensioned construction. If no measures are taken to minimize restraint to shortening from columns, braced frames, moment frames, and shear walls, strains resulting from concrete shrinkage, creep, temperature, and elastic shortening associated with post-tensioning can result in high tensile stresses and significant cracking. In an elevated slab, the common solution is to use a pour strip. An innovative pour strip design based on the use of mechanical couplers is discussed.
Available in the following language(s): Spanish
The conversion of a historic brewery in Bavaria, Germany, into an office and events space posed a challenge: the need to replace five large stone window frames while retaining the original aesthetic of the façade. Using computer-aided design files specifying the geometry of the window frames, digital patterns were created to print polymer formwork elements that were successfully used to cast the window frame elements.
Available in the following language(s): Spanish
A unique feature of the Port of Seattle’s expanded International Arrivals Facility main terminal building at the Seattle-Tacoma International Airport is the incorporation of 37 precast concrete shear walls along the west side of the structure. These walls are exposed to view, so a quality finish was essential. All walls were cast horizontally, with formed surfaces on one long side and the two radiused ends. The other long side was manually completed with a hard-troweled finish.
Available in the following language(s): Spanish