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ETA 19/0665 v03 of 22/01/2020 page 6 of 18
Table B1: Minimum concrete cover c
min
of post-installed rebar
depending on drilling method and drilling tolerance
Drilling method
Bar diameter
[mm]
Minimum concrete cover c
min
[mm] / Minimum half clear
spacing [mm]
Without drilling aid
With drilling aid
Hammer drilling
(HD)
and
(HDB)
1)
ϕ < 25
30 + 0,06 · l
b
≥ 2 · ϕ
30 + 0,02 · l
b
≥ 2 · ϕ
ϕ ≥ 25
40 + 0,06 · l
b
≥ 2 · ϕ
40 + 0,02 · l
b
≥ 2 · ϕ
Diamond coring with
roughening with Hilti
Roughening Tool TE-
YRT
(RT)
ϕ < 25
30 + 0,06 · l
b
≥ 2 · ϕ
30 + 0,02 · l
b
≥ 2 · ϕ
ϕ ≥ 25
40 + 0,06 · l
b
≥ 2 · ϕ
40 + 0,02 · l
b
≥ 2 · ϕ
1)
HDB = Hollow Drill Bit Hilti TE-CD and TE-YD
Comments: The minimum concrete cover acc. EN 1992-1-1 must be observed
.
Table B2: Maximum embedment depth l
b,max
depending on bar diameter and dispenser
(valid for hammer drilling and hammer drilling with Hilti Hollow Drill Bit)
Element
Dispensers
Rebar
HDM 330, HDM 500
HDE 500
Concrete temperature ≥ -10 °C
Concrete temperature ≥ 0 °C
Size
l
b,max
[mm]
l
b,max
[mm]
8 -
32
700
1000
Table B3: Maximum working time and minimum curing time
Temperature in the base
material T
Maximum working time
t
work
Minimum curing time
t
cure
-10 °C to -5 °C
3 hours
20 hours
-4 °C to 0 °C
1,5 hours
8 hours
1 °C to 5 °C
45 min
4 hours
6 °C to 10 °C
30 min
2,5 hours
11 °C to 20 °C
15 min
1,5 hours
21 °C to 30 °C
9 min
1 hour
31 °C to 40 °C
6 min
1 hour
Annex B2
of ETA N° 19/0665
Intended Use
Minimum concrete cover / Maximum embedment depth
Maximum working time and minimum curing time