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  February 2015  
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Concrete International February 2015 No. 2 Complete Issue
Concrete International February 2015 No. 2 Complete Issue

Glen Elder Dam and Fort Randall Dam Spillway Repairs
The Glen Elder Dam, completed in 1968, is located at the confluence of the North and South Forks of the Solomon River in north-central Kansas, near Glen Elder, KS. The Fort Randall Dam, completed in 1952, is located on the Missouri River in southeast South Dakota, near Pickstown. The spillway inlet apron slab at the Glen Elder Dam underwent significant renovation in early 2010. The spillway outlet apron slab at the Fort Randall Dam underwent significant renovation in 2013. This article highlights damage evaluation and repair of spillway slabs in both structures, including extensive use of hydrodemolition and a shrinkage reducing/compensating additive in the repair concrete.

A Top-Down Approach
To meet the demands of Internet retailing, landlords holding expiring leases on vintage low-rise buildings are exploring the feasibility of raising the roofs of these buildings to clear heights upwards of 45 ft (13.5 m). What comes next is an evaluation of an existing conventional interior concrete slab-on-ground installed in the facility several decades ago and selection of one of the options available to increase structural capacity of this floor. These options, including bonded concrete toppings, bonded epoxy mortar overlay, unbonded concrete overlay, and removal and replacement of an existing slab, are discussed in the article.

Products & Practice Spotlight: Transit Center Construction Stays on Track
Accurately monitoring concrete maturity can be critical on large construction projects. To determine the temperature of the concrete after it has been placed, a system containing radio frequency identification tags with built-in sensors, as well as handheld readers and software to interpret the collected data were used during the construction of the Transbay Transit Center in San Francisco, CA. The collected data allowed significant reductions in the construction schedule relative to estimates based on the concrete mixture properties and ambient conditions. Since its installation at the onset of the 3-year project, the system paid for itself three to four times over.

The Highest of Technical Standards
After 30 years of service, Basile G. Rabbat has retired as the secretary of ACI Committee 318. This article touches on some of the key activities and events that led to his appointment and that took place during his tenure as secretary. His responses to a brief set of questions are also providing, giving his personal perspective on becoming an engineer and serving on the committee as well as his plans for the future.

ACPA 25th Annual Excellence in Concrete Pavement Awards
The American Concrete Pavement Association (ACPA) announced the recipients of its 25th Annual Excellence in Concrete Pavements awards, recognizing quality concrete pavements constructed in the United States and Canada.

Always Advancing and Spanning the Globe
Highlights of the ACI Fall 2014 Convention

Concrete Q & A: Winter Maintenance of a New Concrete Parking Lot
Are there any ACI standards that discuss winter maintenance of concrete parking lots?


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