Table 9 — Calculated tension development and Class B Splice development lengths for CSA-G30.18 rebar in walls , slabs , columns , and footings per CSA A23.3 Clause 12 for Hilti HIT-RE 500 V3 , not considering fire 3 , 4 , 5
Rebar size
10M d cs
+ K tr min . edge dist . mm 1 min . spacing mm 2 l d mm
ƒ ́c = 20 MPa ƒ ́c = 25 MPa ƒ ́c = 30 MPa ƒ ́c = 40 MPa
Class B splice mm
l d mm
Class B splice mm l d mm
Class B splice mm
60 50 300 380 300 340 300 310 300 300 15M 70 75 410 540 370 480 340 440 300 380 20M 2.5 d b
80 100 510 660 450 490 410 540 360 460 25M 120 125 820 1,060 730 950 670 870 580 750 30M 130 150 960 1,250 860 1,120 790 1,020 680 890
1 Edge distances are determined using the minimum cover specified by CSA A23.3 with an additional 6 % of the development length per suggestions for drilling without an aid per Hilti Rebar Tech Guide Section 3.3 . Smaller edge distances may be possible , for which development and splice lengths may need to be recalculated . For further information on required cover see CSA A23.3 Table 17 .
2 Spacing values represent those producing d cs = 5 d b rounded up to the nearest 10mm . Smaller spacing values may be possible , for which development and splice lengths may need to be recalculated . For further information on required spacing see CSA A23.3 Sec . 6.6.5.2 .
3 k 1 = 1.0 ; k 2
= 1.0 for uncoated reinforcement ; k 3 = 1.0 for normal density concrete ; k 4
= 0.8 for 20M bars and smaller bars , 1.0 for 25M and larger bars ; See CSA A23.3 Clause 12.2.4 . 4 Values are for normal weight concrete . For lightweight concrete , multiply development and splice lengths by 1.3 . 5 Development and splice length values are for static design . For tension development and splice lengths of bars in joints , see CSA A23.3 21.3.3.5 . For further information about reinforcement in seismic design , see CSA A23.3 Ch . 21 . l d mm
Class B splice mm
POST-INSTALLED REBAR DESIGN FOR DEVELOPMENT LENGTH FIRE EXPOSURE
Figures 9 and 10 below are from ESR-3814 and shows the effects of temperature on the HIT-RE 500 V3 adhesive when exposed to a fire condition when used for development of rebar for either ACI or CSA code provisions . After determining the equivalent bond stress for the ambient temperature , t equiv
, as noted in Section 2.1 of this document , then calculate the bond stress in the fire exposure condition , t fire ( θ ) using the equations from Figures 9 and 10 . The development length in the fire exposure condition , l d , fire , will then be as follows : l d , fire = t equiv
∙ l d t fire ( θ )
The final development length used would be the maximum of l d , or l d , fire
. See Section 2 of this document for more information on the design in fire exposure conditions .
Figure 9 — HIT-RE 500 V3 bond stress vs . temperature of post-installed rebar applications , short term loads including seismic
Figure 10 — HIT-RE 500 V3 bond stress vs . temperature of post-installed rebar applications , sustained loads including seismic
18 May 2023