Rebar

	Grade 40

	(40,000 psi minimum yield strength)

	low carbon

	easy to bend

	most common

	Grade 60

	(60,000 psi minimum yield strength)

	higher vertical strength

	dams, nuclear plants

	Size number

	#1 = 1/8"

	Identification

		#1 - 18 			diameter

		rebar deformations	mill

		A 			mill initial

		40			grade

		60

		N			new steel

		A			axle steel

		R			rail steel

		W			low alloy steel

Rebar Tie Wire

	16 gauge annealed steel

	3 1/2 lb coils



Remesh

	saves installation time

	reduces number & size of cracks

	sold in

	rolls

	sheets

	6 x 12 - W 16 x W 8

	longitudinal wire spacing

	      transverse wire spacing

		longitudinal wire size

                                         transverse wire size



Standard Hooks

	90 degree

	180 degree

	D = Finished bend diameter

	is a multiple of the

	d = bar diameter



Stirrups & Tie Hooks

	135 degree

	seismic stirrups



Splices

	ties

	dowel bar splicer system

	mechanical splicing device

Nycon Fibres

	polypropylene fibres

	secondary reinforcement

	reduces plastic shrinkage

	reduces hardened shrinkage cracking

	3/4" long

	1 lb/cubic yard = 34,000,000 firbres

	mix for 3 minutes



Glass Fibres

	late 60's

	limited lifetime in waethering situations

	thermodynamic



Carbon Fibres

	high strength

	good bond

	corrosion free

	expensive



Plastic Mesh

	20 mm web thickness

	145 pcf  (2320 kg/cubic meter) Unreinforced

	150 pcf  (2400 kg/cubic meter) Reinforced

	coarse aggregates 75% of volume

	28 day strength

	>= 2500 lb/sq. inch

	air-dry weight < 115 pcf

	85 - 115 pcf Structural LWC

	50 - 85 pcf Semi Structural Concrete

	10 - 50 pcf Heat Insulation Concrete

	Structural Lightweigth Concrete

		min 2,500 psi

		fibre concrete

		steel, glass, synthetic fibres

		higher tensile strength

	Semi-Structural Concrete

		roof decking

		light loads 40 psf

	Heat-Insulation Concrete

		20 - 30% air contents

		perlite

		foaming agents

		aluminum powder

	150 - 380 pcf

	radiation shielding

	nuclear shielding

	counterweight