2009 Virginia Uniform Statewide Building Code (USBC)

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Presentation transcript:

2009 Virginia Uniform Statewide Building Code (USBC) Concrete Specifications By: Teck L. Chua, PE Director - Technical Services NVCAC, April 11, 2013 East Region - RM Concrete

Overview The law (people with handcuffs). Detail Code requirements on concrete. When the Virginia Code provides no details – what’s next? East Region - RM Concrete

Effective March 1, 2011 East Region - RM Concrete

East Region - RM Concrete

East Region - RM Concrete

East Region - RM Concrete

Deadline: March 1, 2012 East Region - RM Concrete

East Region - RM Concrete

East Region - RM Concrete

Code Requirements – the Details on concrete East Region - RM Concrete

Two zones in Virginia East Region - RM Concrete

Should have been named concrete requirements East Region - RM Concrete

Deicing chemical exposure limits content of fly ash, slag cement, other pozzolans Northern Concrete Division www.vulcanmaterials.com/northern_concrete

Material Standards: ACI 318-08 Ch. 3 or ACI 332 The usual ASTMs covering cementitious materials, aggregates, water, admixtures, ready mixed concrete, sampling and testing. Northern Concrete Division www.vulcanmaterials.com/northern_concrete

East Region - RM Concrete

Driveway and Walkway are not mentioned! East Region - RM Concrete

When the Virginia Code has no details – Anything goes? East Region - RM Concrete

What if “generally recognized standards of performance ARE available . . . ?“ East Region - RM Concrete

East Region - RM Concrete

IRC: East Region - RM Concrete

East Region - RM Concrete

East Region - RM Concrete

“Cal” – calcium chloride Reinforced: yes, when dry or protected Plain: yes, all conditions “2.0% by weight of cementitious materials” 450pcy*2% < 9 pcy 530pcy*2% < 10.6 pcy Molecular weight: calcium chloride 2X chloride ion ACI332-2% < ACI 318-0.15%

Placement time > 90 min Northern Concrete Division www.vulcanmaterials.com/northern_concrete

Northern Concrete Division www.vulcanmaterials.com/northern_concrete

Northern Concrete Division www.vulcanmaterials.com/northern_concrete

Northern Concrete Division www.vulcanmaterials.com/northern_concrete

Northern Concrete Division www.vulcanmaterials.com/northern_concrete

Jt. Depth: Min 3.5”*0.25 = 0.875” = 7/8” Northern Concrete Division www.vulcanmaterials.com/northern_concrete

Northern Concrete Division www.vulcanmaterials.com/northern_concrete

WWF – reinforcement? Northern Concrete Division www.vulcanmaterials.com/northern_concrete

Summary Residential concrete construction is governed by a Code that is as tough as commercial concrete construction. Concrete exposed to deicing chemicals, such as driveways, requires 4500psi concrete. East Region - RM Concrete

Questions ? East Region - RM Concrete