Table 20 — Hilti HIT-ICE design information with Rebar holes drilled with a hammer drill and carbide bit ( or hollow drill bit ) in accordance with ACI 318 Ch . 17 1
Design parameter Symbol Units
Nominal rod diameter ( in .)
# 3 # 4 # 5 # 6 # 7 # 8 # 9 # 10 # 11 ACI 318
Ref
Nominal anchor diameter d a in 3 / 8 1 / 2 5 / 8 3 / 4 7 / 8 1.00 1-1 / 8 1-1 / 4 1-3 / 8 ( mm ) ( 9.5 ) ( 12.7 ) ( 15.9 ) ( 19.1 ) ( 22.2 ) ( 25.4 ) ( 28.6 ) ( 31.8 ) ( 34.9 )
Effective minimum embedment 2 h ef , min in 2-3 / 8 2-3 / 4 3-1 / 8 3-1 / 2 3-1 / 2 4 4-1 / 2 5 5-1 / 2 ( mm ) ( 60 ) ( 70 ) ( 79 ) ( 89 ) ( 89 ) ( 102 ) ( 114 ) ( 127 ) ( 114 )
Effective maximum embedment 2 h ef , max in 7-1 / 2 10 12-1 / 2 15 17-1 / 2 20 22-1 / 2 25 27-1 / 2 ( mm ) ( 191 ) ( 254 ) ( 318 ) ( 381 ) ( 445 ) ( 508 ) ( 572 ) ( 635 ) ( 699 ) in h
Minimum concrete thickness 2 h ef
+ 1-1 / 4 min
( mm ) ( h ef + 30 ) hef + 2d 0
( 8 )
Critical edge distance in ( mm ) -
Minimum edge distance c min in 1-7 / 8 2-1 / 2 3-1 / 8 3-3 / 4 4-3 / 8 5 5-5 / 8 6-1 / 4 7 ( mm ) ( 48 ) ( 64 ) ( 79 ) ( 95 ) ( 111 ) ( 127 ) ( 143 ) ( 159 ) ( 178 )
Minimum anchor spacing s min in 1-7 / 8 2-1 / 2 3-1 / 8 3-3 / 4 4-3 / 8 5 5-5 / 8 6-1 / 4 7 ( mm ) ( 48 ) ( 64 ) ( 79 ) ( 95 ) ( 111 ) ( 127 ) ( 143 ) ( 159 ) ( 178 )
Effectiveness factor for uncracked concrete 4 k c , uncr -
Effectiveness factor for cracked concrete 4 k c , cr -
Strength reduction factor for tension , concrete failure modes 5 Ф c , N - 0.65 17.3.3
Strength reduction factor for shear , concrete failure modes 5 Ф c , V - 0.70 17.3.3
Temperature range A 6
Permissible installation conditions
Characteristic bond stress in cracked concrete 7 τ k , cr psi MPa
24 ( 10 ) 17 ( 7.1 )
17.4.2.2
17.4.2.2
n / a n / a n / a n / a n / a n / a n / a n / a n / a 17.4.5
Characteristic bond stress in uncracked concrete 7
|
τ k , uncr
|
psi |
1,015 |
1,005 |
990 |
975 |
965 |
950 |
935 |
920 |
905 |
|
|
( MPa ) |
( 7.0 ) |
( 6.9 ) |
( 6.8 ) |
( 6.7 ) |
( 6.7 ) |
( 6.6 ) |
( 6.4 ) |
( 6.3 ) |
( 6.2 ) |
Strength reduction factor for tension , bond failure modes , dry concrete
Strength reduction factor for tension , bond failure modes , water saturated concrete
Anchor category
- 1 1 1 2 2 2 2 2 2
Ф b , dry
- 0.65 0.65 0.65 0.55 0.55 0.55 0.55 0.55 0.55
Anchor category
- 1 1 1 2 2 2 2 2 2
Ф b , ws
- 0.65 0.65 0.65 0.55 0.55 0.55 0.55 0.55 0.55
1 Design information in this table is based on testing in accordance with ACI 355.4 . 2 See figure 4 of this section . 3 Minimum edge distance may be reduced to 1-3 / 4 " ( 44mm ) provided the 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 Values provided for post-installed anchors under Condition B without supplementary reinforcement as defined in ACI 318 17.3.3 . For cases where the presence of supplementary reinforcement can be verified , the reduction factors associated with Condition A may be used .
6 Temperature range A : Max . short term temperature = 130 ° F ( 54 ° 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 = 2500 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 ].
8 d 0 = drilled hole diameter
17.4.5
208 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