Identifying Reinforcements: A Guide to Steel Bar Specifications and Markings, Summaries of Political Philosophy

Download Identifying Reinforcements: A Guide to Steel Bar Specifications and Markings and more Summaries Political Philosophy in PDF only on Docsity!

R S B I n s t a l l a t i o n C o u r s e

M o d u l e 2 :

I d e nti f y i n g

Re i nfo rc e m e nt s

Learning

Outomes

Identify the different grade, size and type of steel of RSB based on their marking 1 Familiarize with Philippine National Standards for Steel 2 Familiarize with the chemical composition and mechanical properties of steel 3 Describe the dimension and mass tolerances of reinforcing steel bars 4

IDENTIFYING REINFORCEMENT

PNS 49: 2002 –Steel bars for concrete reinforcement – Specifications

• This standard specifies the requirements for

deformed steel bars for concrete reinforcement.

It applies to steel bars manufactured from prime

billets or ingots, supplied as-rolled or hot-rolled

with subsequent quenching and self-tempering.

• Six grades of steel bars are defined, namely;

Grades 230, 275, 415, 230W, 275W and 415W.

“W” grade steel requires a maximum carbon

equivalent of 0.55 and maximum carbon 0.3%.

D I M E N S I O N A N D M A S S T O L E R A N C E

1. The nominal dimensions and mass of steel bars shall conform to table 3.
2. The standard length of steel bars shall be 6.0, 7.5, 9.0, 10.5 and 12.0 meters.
3. The tolerance on the mass of one piece of steel bar shall ± 6 percent.
4. The tolerance on the mass of one lot of steel bars shall be ± 4 percent.

D I M E N S I O N A N D M A S S T O L E R A N C E The average spacing between lugs measured on the same side of deformed bars shall not exceed 70 percent of the nominal diameter of the bar.

6. The height of lugs on deformed bars, in relation to the nominal diameter, shall not be less than the values specified.

V I S U A L L Y I D E N T I F Y I N G R E I N F O R C E M E N T S / M A R K I N G S The manufacturer's identifying mark, bar size and grade shall be clearly embossed in each bar. The system of marking shall be as given above and as shown. A. Manufacturer's identifying mark – a logo or symbol registered or to be registered with the Philippine Patent Office and published in the Official Gazette. B. Bar size – Arabic number reflecting the nominal diameter C. Grade – Dash (parallel to the rib) or the grade number itself.

V I S U A L L Y I D E N T I F Y I N G R E I N F O R C E M E N T S / M A R K I N G S The manufacturer's identifying mark, bar size and grade shall be clearly embossed in each bar. The system of marking shall be as given above and as shown. A. Manufacturer's identifying mark – a logo or symbol registered or to be registered with the Philippine Patent Office and published in the Official Gazette. B. Bar size – Arabic number reflecting the nominal diameter C. Grade – Dash (parallel to the rib) or the grade number itself.

THANK YOU