Product Technical Guides : US-EN Anchor Fastening - August 2021 | Page 227

Anchor Fastening Technical Guide , Edition 22
Table 42 — Hilti HIT-ICE adhesive design information with CA rebar in hammer drilled holes in accordance with CSA A23.3 Annex D 1
Design parameter Symbol Units
Rebar size 10M 15M 20M 25M 30M A23.3-14
Anchor O . D . d a mm 11.3 16.0 19.5 25.2 29.9
Effective minimum embedment 2 h ef , min mm 70 80 90 101 120
Effective maximum embedment 2 h ef , max mm 226 320 390 504 598
Minimum concrete thickness 2 h min mm h ef
+ 30 h ef + 2d o
Ref
Critical edge distance c ac mm
3.2.5
Minimum edge distance 3 c min mm 57 80 98 126 150
Minimum anchor spacing s min mm 57 80 98 126 150
Coeff . for factored concrete breakout resistance , uncracked concrete 4 k c , uncr – 10 D . 6.2.2
Coeff . for factored concrete breakout resistance , cracked concrete 4 k c , cr – 7 D . 6.2.2
Concrete material resistance factor ф c – 0.65 8.4.2
Resistance modification factor for tension and shear , concrete failure modes , Condition B 5 R conc
– 1.00 D . 5.3 ( c )
Temp . range A 6
Characteristic bond stress in cracked concrete 7 τ cr psi n / a n / a n / a n / a n / a D . 6.5.2 psi 1,010 990 975 950 930
Characteristic bond stress in uncracked concrete 7 τ uncr ( MPa ) ( 7.0 ) ( 6.8 ) ( 6.7 ) ( 6.6 ) ( 6.4 )
Reduction for seismic tension α N , seis
– n / a
Permissible installation conditions
Resistance modification factor tension & shear , bond failure dry concrete
Resistance modification factor tension & shear , bond failure water-saturated concrete
Anchor category
( MPa )
– 1 1 2 2 1
R dry
– 1.00 1.00 0.85 0.85 1.00
Anchor category
– 1 1 2 2 1
R ws
– 1.00 1.00 0.85 0.85 1.00
1 Design information in this table is based on testing in accordance with ACI 355.4 . 2 See figure 5 of this section . 3 Minimum edge distance may be reduced to 45mm provided rebar remains untorqued . 4 For all design cases , ψ c , N
= 1.0 . The appropriate coefficient for breakout resistance for cracked concrete ( k c , cr ) or uncracked concrete ( k c , uncr
) must be used .
5 For use with the load combinations of CSA A23.3 chapter 8 . Condition B applies where supplementary reinforcement in conformance with CSA A23.3 section D . 5.3 is not provided , or where pullout or pryout strength governs . For cases where the presence of supplementary reinforcement can be verified , the resistance modification factors associated with Condition A may be used .
6 Temperature range A : Max . short term temperature = 130 ° F ( 55 ° C ), max . long term temperature = 110 ° F ( 43 ° C ). Short term elevated concrete temperatures are those that occur over brief intervals , e . g ., as a result of diurnal cycling . Long term concrete temperatures are roughly constant over significant periods of time .
7 Bond strength values corresponding to concrete compressive strength f ' c = 2,500 psi ( 17.2 MPa ). For concrete compressive strength , f ' c
, between 2,500 psi
( 17.2 MPa ) and 8,000 psi ( 55.2 MPa ), the tabulated characteristic bond strength may be increased by a factor of ( f ' c / 2,500 ) 0 . 1 [ for SI : ( f ' c
/ 17.2 ) 0 . 1 ].
D . 6.5.2
D . 5.3 ( c )
D . 5.3 ( c )
Table 43 — CA rebar installation specifications with Hilti HIT-ICE adhesive anchor system 1
Setting information Symbol Units
Rebar size 10M 15M 20M 25M 30M
Nominal bit diameter d o in . 9 / 16 3 / 4 1 1-1 / 4 1-3 / 8
Effective embedment minimum h ef , min mm 60 80 90 100 120 maximum h ef , max mm 226 320 390 504 598
Minimum concrete thickness h min mm h ef
+ 30 h ef + 2d o
1 See figure 5 of this section .
Anchor Fastening Technical Guide Edition 22 | 3.0 ANCHORING SYSTEMS | 3.2.5 HIT-ICE ADHESIVE ANCHORING SYSTEM Hilti , Inc . 1-800-879-8000 | en español 1-800-879-5000 | www . hilti . com | Hilti ( Canada ) Corporation | www . hilti . ca | 1-800-363-4458
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