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ACI WEB SESSIONS
The Art of Concrete
ACI Spring 2012 ConventionMarch 18 – 21, Dallas, TX
ACI WEB SESSIONS
James Shilstone (Jay) is the 3rd generation of Shilstones to be involved in concrete quality control and follows after his father, Jim, in working with architectural concrete. Jay has been involved in architectural concrete projects worldwide with an accumulated value of over $4,000,000,000. His most recent efforts involve the development of performance
specifications for architectural concrete. Jay is a member of ACI 303, Architectural Concrete, as well as multiple ACI, NRMCA, ASTM and TRB committees dealing with concrete and quality control.
Making Architectural Concrete Work
ACI Spring 2012 Convention“The Art of Concrete”
‐ James M. Shilstone, Jr., FACI
1962 – Jim Shilstone formed Architectural Concrete Consultants
Concrete construction is the only manufacturing process that occurs on the construction site
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Concrete: The Ultimate in Functional Artistry
• Understand Concrete
– Plastic
– Hardened
• Understand the Concrete Process
• Know the Materials available
• Recognize the limitations of the Material and the Process
• Stone vs. wood vs. concrete
Drawings & Specs
• PPPPPP – BRE (1975) – 500 bldgs– 60% of problems originate from design
– 35% from workmanship– 10% from materials
• Constructability• Prebid conference• Preconstruction conference
• Mockups
Construct-ability
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“Exposed” concrete is the most difficult finish to achieve.
Performance Architectural Specs
Mixture Ingredients Aggregate Grading
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Material Color Beware of Contamination
Limitless possibilities Finish impacts appearance
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Gap Graded Mixes
Reinforcing steel congestion
BIM can help but it isn’t the entire answer
Understand tolerances
Cover on Reinforcing Steel The Devil in the Details
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Steel directs the vibrator
The Mirror of the Form Formwork
Formwork Materials Formwork Problems
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Release Agent Formwork – Sealing Joints
Form Butt Joint Location Form Stripping Control
Form Ties ‐ Installation
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Placement Equipment Placement
Placement Technique
Consolidation Equipment Reinforcing Steel Clear Space
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Consolidation‐ Training
Consolidation Problems
Finishing Equipment & Technique Uniform equipment & technique
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Impact Hammer
• Scale (light)
• Bush (medium)
• Jack (heavy)
• Tool (heavy)
Patching
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Case Histories
Southern Bell, Atlanta
White CementGranite sandWhite & black granite stoneSteel FormsBushhammer finish
1515 Poydras, New Orleans Kennedy Memorial, Dallas
Cast in placeWhite cementNeedle scaled finishPost Tensioned
Park West, Dallas
Cast in place matched precastType III and Type I cement
with fly ashTan sandTan stoneLight sandblast
One Main Place, Dallas
White CementWhite and Black GraniteArbeton methodHeavy Sandblast
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Summer Palace, Iran
Preplaced aggregateInjected grout
Mississippi Power & Light, Gulfport
Water Gardens, Ft. Worth, TX
Tan CementRiver GravelHeavy Sandblast
Park Central, Dallas
Blue-gray cementAs Cast FinishLater painted
Thank you for your attention.