CRSI and Reinforcing Steel Update - CPTech · PDF fileCRSI and Reinforcing Steel Update Bob Risser, P.E. ... Proceeding for ACI 301 Reference ... design life for the

CRSI and Reinforcing Steel Update

Bob Risser, P.E. President & CEO

1

TTCC / National Concrete Consortium Fall 2012 Seattle, Washington

Agenda

CRSI – The Organization Bar Markings CRSI “Mythbusters”

CRSI – The Organization

The Concrete Reinforcing Steel Institute (CRSI) was founded in 1924, making it one of America’s oldest construction industry trade associations.


CRSI membership: Reinforcing steel producers Fabricators Placing contractors Accessories manufacturers

(splice, couplers, bar supports).


Associate members include: Epoxy coaters Equipment manufacturers Concrete contractors Other companies engaged in

reinforced concrete construction.


Professional members include: Engineers Architects Construction managers Students

CRSI Membership Represents the Industry

90+% of all U.S. domestic rebar, smooth dowel, and wire production.

80+% of fabricated rebar tonnage.

Most dowel baskets manufactured by CRSI members.

Transportation Efforts

Bridges » Danielle Kleinhans, PhD, P.E.,

Structural/Transportation Engineer » Official Concrete Rep to LTBP » Chair of NCBC

Pavements » Partnership with ACPA » Cooperative Agreement with FHWA

on CRCP

Certification

Epoxy Coating Plant » 20th Year » Proceeding toward ANSI

Accreditation Adhesive Anchor Installer

» Joint ACI-CRSI program » Launched in 2011

The Strength in Reinforced Concrete 9

CRSI as SDO

10 The Strength in Reinforced Concrete

Member of ANSI Standards Committee formed Next steps

» Policy Document ~ » ANSI Application Submitted -

Approval » Ballot Proposed Standards

Proposed Standards

Bar Supports Conversion of curret Manual of

Standard Practice

Proceeding for ACI 301 Reference (Specifications of Structural Concrete)


MSP Moving Forward

Standards for the Usage of Reinforcing Steel in Concrete Construction » ANSI Standard

Guide to Common Reinforcing Steel Industry Practice » Guide and commentary


Working Titles

Bar Markings ~ back to in-lbs


CRSI Board of Directors :

CRSI producer members revert back to the in.-lb marking system » November 9, 2011 meeting

Phase-in target date is January 1, 2014


Why Change Markings?

FHWA no longer mandates metric system on Federal-Aid projects » Memorandum - November 25, 2008

Key ACI documents never converted to soft metric designations

CONFUSION IN INDUSTRY


Bar Markings

Contained in CRSI MSP 2009

Present reference to metric marks


ID Examples


Inspection in Interim Period

Confusion with mill / bar markings?

Should not be a basis for rejection


Planned Monthly Web Updates



Myth #1

All steel reinforcing bar is made with virgin iron ore from the Mesabi Iron Range whose cost is stable over long periods.


Myth Buster #1

Steel reinforcing bar is made of 95 to 98 % scrap steel

Scrap is now a worldwide commodity


Electric Arc Furnace (EAF)

Forming Billets

Cooling Steel Billets

Deformation Machine

Cooling Rack

The New Reality: Volatility

>55% of Rebar Cost is Scrap

28

Figure 1 29

Scrap Prices – 1970 – 2011

$0$50

$100$150$200$250$300$350$400$450$500$550$600

1970 1975 1980 1985 1990 1995 2000 2005 2010

Source: American Metal Market

AMM #1 HMS Composite - $/GT

$35

$125 $125 $115 $145

$65

Jul-08 $519

Aug-11 $419

Nov-08 $101

Mar-04 $250

30

Scrap Prices – 2003-2011

$0$50

$100$150$200$250$300$350$400$450$500$550$600

2003 2004 2005 2006 2007 2008 2009 2010 2011

Source: American Metal Market

AMM #1 HMS Composite - $/GT Jul-08 $519

Aug-11 $419

Nov-08 $101

Mar-04 $250

Figure 2

Myth #2

An ASTM designated product means it is readily available in the marketplace.


Myth Buster #2

Yes, for: » A615, Grade 60 » A706, Grade 60 » Epoxy - coated

Others may be a mill order with a minimum weight (in tons)


Myth #3

Stainless steel reinforcing bar refers to one product.

OR Any stainless steel alloy is

available as reinforcing bar.


Myth Buster #3

There are hundreds of grades & sub grades of Stainless Steel

Stainless Steel » Large family of alloys » Different properties for the application

Reinforcing bar available in 5 to 6 of the alloys


Myth #4

Changing the reinforcing bar type in a bridge deck will guarantee a 75-year design life for the DOT.


Myth Buster #4


Reinforcing steel

Placing conditions

Concrete mix

Curing

Aggregate durability

Myth Buster #4 (cont.)

Bridge decks are made of many interrelated components

It is a system All chain links must have

comparable service lives » Reinforcing steel is but 1 component


Myth #5


CRSI doesn’t participate in research

Myth Buster #5


CRSI R&D Committee

CRSI Research and Education Foundation

Completed Projects

Project University Use of Ultrahigh-Strength Reinforcement in Columns of Frames to Resist Seismic Loads

Purdue University

Evaluation of the Orientation of 90° and 180° Reinforcing Bar Hooks in Wide Members

Missouri University of Science & Technology


• Research Notes being prepared

Lap Splices in Thin Members

School Purdue University Principal Investigator Dr. Santiago Pujol Matching Funds Purdue Foundation Erico Status - Ongoing


Spiral Stirrups

School University of Cincinnati Principal Investigator Dr. Bahram Shahrooz Funding Pankow Foundation CRSI and PCI Status - Pending


dogleg

Bar Bending

School NC State University Principal Investigator Dr. Rudolf Seracino Funding CRSI & NC State Foundation Status - Starting


High-Strength Bar Hooks

School University of Kansas Principal Investigator Drs. David Darwin &

JoAnne Browning Funding EPRI, CRSI, KDOT, Pankow Status - Ongoing 44 The Strength in Reinforced Concrete

High-Strength Rebar

Classed as yield (fy ) ≥ 80 ksi Collaborative research

consortium?


High-Strength Rebar

Economic analysis Develop generic material

requirements (ASTM spec) Structural research Code adoption


High-Strength Rebar

What questions does the industry need / want to be answered?

Is it a viable product? Will its availability expand / open

markets for concrete construction?


Myth #6


CRSI has no local presence, just an office in Chicago

CRSI Regions

THANK YOU!

www.crsi.org

Documents

CRSI and Reinforcing Steel Update - CPTech · PDF fileCRSI and Reinforcing Steel Update Bob Risser, P.E. ... Proceeding for ACI 301 Reference ... design life for the