Concrete construction keeps evolving, and so do its governing standards. The American Concrete Institute (ACI), for example, has added an important tool to its toolbox for both architects and specifiers with ACI 563-18, Specifications for Repair of Concrete in Buildings.
Compressive strength is a clearly defined property that can be measured directly at a particular point in time using standardized test methods. On the other hand, the properties making concrete durable are many in number. Therefore, durability is more complex to define, measure, and specify.
Concrete slab pour 1B was supposed to be routine, occurring early in the construction of a parking garage in the Midwest. However, low compressive strength issues led to lengthy and costly project delays, as well as some interesting theories about the causes.
The theme of transportation was dominant when architecture firm Leo A. Daly designed a five-building distribution center for Dollar General in Bessemer, Alabama. Rather than opting for a conventional finish on the warehouse’s precast exterior walls, the Omaha-based design firm sought a visual way to bring the theme to life.
While heating exterior penetrations wastes energy and increases carbon emissions and operating costs, chilling interior structures reduces comfort and allows condensation and mold to form on adjacent surfaces. Therefore, one must look for an alternative solution.