Design Parameters

The Grout

Presstec Is a one component mix of Portland cement, graded aggregate and additives which when mixed with water produces a pumpable grout which exhibits good strength development and minimal shrinkage.

Mixing

55 lbs. (25kg) of Presstec requires 1.6 Gal.US ( 1.3 gal CAN.), ( 6 litres) of water. Mixing can be carried out either in a bucket using a conventional hand held plaster mixer for small quantities or in a drum mixer for larger quantities. The mix time should be sufficient to break down any lumps and give a free flowing grout. Presstec should be added to water on mixing.

Pot Life

45-60 minutes dependent on ambient temperature.

Physical Performance

All tests carried out at 68 deg. F (20 deg. C), 65% RH
Initial set - 160 mins.
Final set - 180 mins.

The grout is specially made to CINTEC's requirements. It has flow and anti-shrink additives which meet the requirements of the German DIN Standards. The grout also has been successfully tested using accelerated shrinkage tests. The grout bonds to the parent material through the sock as it is inflated. The strength of the insitu construction to resist the anchor loads depends on the anchor body section utilized. If solid bar is used, the anchor body is deformed. If the anchor is circular the section is crimped. For square section material a plate slightly smaller than the bore hole is welded to the anchor at both ends to ensure that the grout strength is mobilized. ( See Illustration A.)

Typical Presstec Grout Strength with time for CINTEC Anchors

Time after injection	Compression	Tension
5 hours	203 psi (1.4 MPa)	58 psi (0.4 MPa)
1 day	3,330 psi (23.0 MPa)	420 psi (2.9 MPa)
28 days	5,800 psi (40.0 MPa)	480 psi (3.3 MPa)

Modulus at Elasticity, E= 4,000,000 psi (28 kN/sq. mm.) @ 28 days.

The Steel

The steel section capacity can be determined by standard engineering calculations based on the steel strength. Typical values given below relate to North American Standards.

Characteristic Tension/Compression Strength of Standard Anchors Based on Steel Capacity

Installed anchor strength is dependent on the strength of parent material and the embedment length.

Anchor Type	Minimum Embedment	Minimum Value
5/16in. dia. x 0.04in. wall (8mm dia. x 1 mm wall)	2 in. (50 mm.)	900 lb. (4.0 kN.)
3/8in. dia. x 0.04in. wall (10mm dia. x 1 mm wall)	2 in. (50 mm.)	1,350 lb. (6.0 kN.)
5/8 x 5/8 in. x 0,06 wall HSS (15 x 15 mm x 1.5 mm wall HSS)	4 in. (100 mm.)	3,820 lb. (17.0 kN.)
3/4 x 3/4 x 0.08 in wall HSS (20 x 20mm x 2mm wall HSS)	4 in. (100 mm.)	6,750 lb.(30.0 kN.)
1 3/16 x 1 3/16in. x 0.12 in. wall HSS (30 x 30 mm. x 3 mm, wall HSS)	4 in. (100 mm.)	14,850 lb. (66.0 kN.)

Characteristic Shear Strength of Standard Anchors Based on Steel Capacity

Installed anchor strength is dependent on the strength of parent material and the embedment length.

Anchor Type	Minimum Value
5/16 in. dia. x 0.04 in. wall (8 mm. dia. x 1 mm. wall)	540 lb. (2.4 kN.)
3/8 in. dia x 0.04 in. wall (10 mm. dia. x 1 mm. wall)	675 lb. (3.0 kN.)
5/8 x 5/8 in. x 0.06 in. wall HSS (15 x 15 mm. x 1.5 mm. wall HSS)	1,080 lb. (4.8 kN.)
3/4 x 3/4 in. x 0.08 in. wall HSS (20 x 20 mm. x 2 mm. wall HSS)	2,250 lb. (10.0 kN.)
1 3/16 x 1 3/16in. x 0.12 in. wall HSS (30 x 30 mm. x 3 mm. wall HSS)	5,050 lb. (22.5 kN.)

Characteristic Moment Capacity of Standard Anchors Based on Steel Capacity

Installed anchor strength is dependent on the strength of parent material and the embedment length.

Anchor Type	Minimum Value
5/16 in. dia. x 0.04 in. wall (8 mm. dia. x 1 mm. wall)	6.6 ft.-lb. (9 N-M.)
3/8 in. dia. x 0.04 in. wall (10 mm dia x 1 mm. wall)	10.3 ft-lb. (14N-M.)
5/8 x 5/8 in. x 0.06 in. wall HSS (15 x 15 mm. x 1.5 mm. wall HSS)	54.5 ft-lb. (74 N-M.)
3/4 x 3/4 in. x 0.08 in. wall HSS (20 x 20mm. x 2mm. wall HSS)	129.0 ft-lb. (175 N-M.)
1 3/16 x 1 3/16 in. x 0.12 in. wall HSS (30 x 30 mm. x 3 mm. wall HSS)	435.0 ft-lb. (590 N-M.)

Structural Stainless Steels

Type	Grade	Proof Stress	Tensile Strength	Elongation
Austinitic Stainless Steel	304S11	26.1 ksi. (180 MPa.)	69.6 ksi. (480 MPa.)	40%
	304S15	28.3 ksi. (195 MPa.)	72.5 ksi. (500 MPa.)	40%
	304S16	28.3 ksi. (195 MPa.)	72.5 ksi. (500 MPa.)	40%
	316S11	27.6 ksi. (190 MPa.)	71.0 ksi. (490 MPa.)	40%
	316S13	27.6 ksi. (190 MPa.)	71.0 ksi. (490 MPa.)	40%
	316S31	30.5 ksi. (210 MPa.)	74.0 ksi. (510 MPa.)	40%
	316S33	30.5 ksi. (210 MPa.)	74.0 ksi. (510 MPa.)	40%

The Sock

The sock is used to shape the grout into its final position. It acts both as a temporary form and a sieve that allows the grout milk to flow through to the parent material. (See 'Control Systems'). The sock is polyester- based and can be manufactured into standard sizes from 3/4 in. to 12 in. (20 mm. to 300 mm.) in diameter. The mesh sizes of each sock together with the amount of expansion can also be varied dependent upon the application.

The Parent Material

The strength of the parent material and/or mortar can govern the anchor capacity. When the parent material or mortar strength is indeterminate, the installed capacity can be determined from insitu tests.

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