2009 Virginia Uniform Statewide Building Code USBC Concrete

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 1. The law (people with handcuffs). 2. Detail Code requirements on concrete. 3. 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

Deadline: March 1, 2012 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

“Cal” – calcium chloride 1. Reinforced: yes, when dry or protected 2. Plain: yes, all conditions 3. “ 2. 0% by weight of cementitious materials” • 450 pcy*2% < 9 pcy • 530 pcy*2% < 10. 6 pcy 4. Molecular weight: calcium chloride 2 X chloride ion • ACI 332 -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

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 1. Residential concrete construction is governed by a Code that is as tough as commercial concrete construction. 2. Concrete exposed to deicing chemicals, such as driveways, requires 4500 psi concrete. East Region - RM Concrete

Questions ? East Region - RM Concrete