Building Management Hawaii April/May 2014 - (Page 30)

ConCrete Restoring Exposed Aggregate Patch matching is nearly impossible when concrete restoration involves an exposed aggregate surface; the real magic is to make the work undistinguishable. By Brent Cullinan C oncrete is one of the most widely used construction materials in Hawaii. Many buildings have an appearance called architectural or decorative exposed aggregate finish, which allows for both an aesthetic finish and structural capabilities in one. This concrete is made to be seen. Whether creating broad expanses or minute details, concrete permanently captures the chosen look. Achieving an architectural or decorative appearance usually requires that something different be done to the concrete. Whether that involves special forms, special finishing techniques or special ingredients, the variety of effects is almost unlimited. There is a distinctive Hawaiian-style look to exposed aggregate finishes in our Island buildings. We have two unique types of rock here rarely used in the Mainland: coral and basalt, or lava rock. These two elements provide the texture and color that many architects look for when designing a Hawaiian-style structure. For years, these rocks have been sourced from local quarries from all islands. Oahu is famous for its "blue rock" basalt. Kauai is known for its fossilized coral. Molokai has an almost infinite supply of beach sand and red cinder. Maui still supplies sand to local concrete companies. And the Big Island provides fresh black lava, used as a veneer to clad many iconic Hawaiian office buildings. The Hawaiian-style structure can, however, create long-term maintenance problems often not found in standard structural concrete buildings. The majority of our office and condo buildings are painted just after they're built. Paint provides more than just color to the exterior. It acts to prevent the underlying substrate from a variety of ailments. Paint stops moisture, promotes anticarbonation, stops erosion and keeps your building looking clean. A concrete building that is painted is resistant to water infiltration. OVER 30 YEARS of professional CONCRETE RESTORATION Spall Repairs Crack Repairs Leak Repairs Waterproofing Painting Coatings WIL L IAMS HAWAII , INC. C O N C R E T E R E P A I R & C O A T I N G S Ph: (808) 455-5303 * Fax: (808) 455-5829 Extreme spalling on exposed aggregate fluted concrete due to porous rock and bad rebar placement C-13039 30 April-May 2014 BMH

Table of Contents for the Digital Edition of Building Management Hawaii April/May 2014

Editor’s Note By Stacy Pope
Hawaiiana Hits The Big Five-0
CONCRETE Restoration and Repairs: Maintaining A Strong Foundation
Concrete Spalls, Cracks And Leaks
Should You Repair Or Replace?
Restoring Exposed Aggregate Surfaces
Preserving A Historic Treasure
ELEVATOR Modernization: Are You Losing Energy?
Greening Your Elevators
Upgrading On A Budget
INSURANCE: Locking Down The Leaks
Navigating Property Insurance
COOLING TOWERS: HVAC Chemical Feed Pumps
Waikiki’s Oldest Hotel Keeps It Cool
Industry News or Movers & Shakers
On Site: Self-Management 101

Building Management Hawaii April/May 2014