April 1995 Table of Contents

Features Tilt-Up Goes Upscale

Tilt-up panels with elaborate designs are being used to build homes in the Rockies, retail shops on the West Coast, and hotels in Florida. The big news is the increasing popularity of tilt-up construction for large distribution centers, often vast structures ranging from several hundred to over a million square feet. Read more

Features Specifying Architectural Cast-in-Place Concrete

To achieve the desired color and texture in exposed cast-in-place concrete surfaces, architects and engineers must specify several steps and precautions in addition to those used for structural concrete. Read more

Features Creating Concrete Rock and Waterscapes

Landscaping with artificial rocks requires more than knowledge of suitable materials and techniques; it also calls for artistic ability and knowledge of geology. Read more

Features Custom Forms Enhance Bridge Pier Design

Graceful arches and rustications highlight the concrete piers of a 3,840-foot bridge being constructed over the Tolomato River in Vilano Beach, Fla., near St. Augustine. Because the $15.6 million bridge is located in a busy recreational area, the Florida Department of Transportation calls for the highly visible piers to be elegant as well as efficient. The piers feature soaring half-arches on the exterior, a cathedral arch between the columns, and rustication of the columns and portions of the cap. Read more

Features Proposed Changes to ACI Building Code for Reinforced Concrete

Members of ACI committee 318, Building Code Requirements for Reinforced Concrete, met in March 1995 to discuss proposed changes to the code and comments on the changes from the concrete industry and other interested parties. The changes most likely to affect concrete construction contractors will be new requirements for shoring and reshoring plans and schedules for multistory construction. Under the proposed changes, contractors will be fully responsible for developing a plan and schedule for removing shores and installing reshores. The contractor will also be responsible for calculating the loads transferred to the structure during the construction process. Read more

Features Contractor's Checklist for Quality Control of Integrally Colored Concrete Flatwork

Integrally colored concrete is not different or mysterious; it is simply normal concrete with a coloring agent added. Working with integrally colored concrete, therefore, requires no special tools or skills. What it does require is: Read more

Features PCA Announces 1994 Concrete Building Competition Winners

Selected by a jury of three architects, the five winning entries in the 1994 Concrete Building Awards sponsored by the Portland Cement Association (PCA) illustrate the use of concrete as a sculptural, structural, and unifying design element. The winning architects chose concrete for such attributes as aesthetics, cost effectiveness, energy efficiency, and environmental considerations. The winning projects range in size from a two-story hillside residence to a 12-acre, $220 million wastewater treatment plant. Read more

Features 1995 Tilt-Up Achievement Award Winners

The common denominator of the six 1995 Tilt-Up Achievement Award winners is the striking architectural design of each building. The structures all demonstrate the ability of tilt-up concrete contractors to produce unique design features. Projects range from a 27,400-square-foot office headquarters erected in just a day and a half to a 1.5 million-square-foot distribution center completed in 195 working days. Read more

Problem Clinic Plastic Shrinkage Crack Prediction

I'm familiar with what causes plastic shrinkage cracks the evaporation of moisture from the surface. Read more

Problem Clinic Tolerances for Footings

I am being asked to remove a footing that I placed because it is not level. What is the allowable tolerance? Read more

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