IDEAL-CT cracking tolerance index (CTIndex)

ASTM D8225 · Tex-250-F

Calculator

IDEAL-CT cracking tolerance index (CT_Index)

ASTM D8225 · Tex-250-F

Enter points from the load-displacement curve, enough to follow it through the peak and down past 65 % of the peak, or the values your software reports.

Units SI (metric) US customary

Results to enter

Specimen diameter, D, mm

Specimen thickness, t, mm

Load-displacement curve
Point	Displacement, mm	Load, kN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

In the order recorded, from the start of loading until the load has dropped well past the peak. More points near and after the peak give a better m75.

Specification

Minimum CT_Index (optional)

Optional: your agency’s minimum for this mix and aging condition.

Example values: a made-up dense-graded specimen, 150 mm across and 62 mm thick, tested at 25 °C.

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