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
www.williamshawaii.com
Extreme spalling on
exposed aggregate
fluted concrete due to
porous rock and bad
rebar placement
C-13039
30
April-May 2014
BMH
www.buildingmanagementhawaii.com
http://www.williamshawaii.com
http://www.buildingmanagementhawaii.com
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
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