Skip to content

Dynamic cone penetrometer: DCP index and CBR

ASTM D6951 · TxDOT Pavement Manual 4.4
Calculator

Dynamic cone penetrometer: DCP index and CBR

ASTM D6951 · TxDOT Pavement Manual 4.4

Enter each set of blows and the depth after it, mark the layers, and get each layer’s penetration index, estimated CBR and modulus.

Units
Test
Readings, from the start depth down
ReadingBlows in the setDepth after the set, mmLayer
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

First row: 0 blows at the start depth (0 at the surface, or the depth of the hole bored through a bound layer). Then each set: the blows in the set, the depth of the tip after it, and the layer it was in (1 at the top).

Specification

Optional. Your agency’s limit for the material tested; every layer is checked against it.

Example values: a granular base over a firm and then a soft subgrade. Mark where the slope of depth against blows changes.

All tools