Indirect Tensile Strengths & Stiffness Values

The following results show the strengths obtained from a variety of materials, moisture contents and grading curves using ecoProactive™ slow hydraulic binder.

The last result shows a comparison of Bituminous Pavement Layers tensile strength and Concrete Pavement Layer tensile strength.

Mixture of clay, soil and aggregate from trench arisings

0–20mm. Arisings 5% ecoProactive™ 10% Moisture content
Fail flex Flex Str. Fail Comp Comp. Str.
42 1 16332 10.2
45 1.1 15642 9.8
42 1 14975 9.4
41 1 15644 9.8
41 1 15422 9.6
43 1 14522 9.1
41 1 16432 10.3
40 0.9 14274 8.9
38 0.9 14992 9.4
39 0.9 15478 9.7
42 1 16422 10.3
44 1 17855 11.2
Mean Flex Mean Comp
0.97 9.79
0–20mm. Arisings 5% ecoProactive™ 15% Moisture content
Fail flex Flex Str. Fail Comp Comp. Str.
35 0.8 10233 6.4
36 0.8 11212 7
32 0.7 9865 6.2
31 0.7 9985 6.2
31 0.7 9862 6.2
30 0.7 9156 5.7
25 0.6 9677 6
26 0.6 10212 6.4
26 0.6 9875 6.2
25 0.6 9744 6.1
24 0.6 9763 6.1
29 0.7 9566 6
Mean Flex Mean Comp
0.68 6.21
0–20mm. Arisings 5% ecoProactive™ 20% Moisture content
Fail flex Flex Str. Fail Comp Comp. Str.
6 0.1 9875 6.2
8 0.2 9744 6.1
12 0.3 9763 6.1
5 0.1 9566 6
9 0.2 2453 1.5
7 0.2 2175 1.4
10 0.2 2655 1.7
6 0.1 2123 1.3
12 0.3 2566 1.6
8 0.2 2543 1.6
6 0.1 2432 1.5
3 0.1 2475 1.5
Mean Flex Mean Comp
0.18 3.04

20mm Ballast (no 2.36mm. down fines)

Ballast (no fines) 5% ecoProactive™ 5% Moisture content
Fail flex Flex Str. Fail Comp Comp. Str.
10 0.2 19566 12.2
8 0.2 20324 12.7
6 0.1 25421 15.9
3 0.1 24133 15.1
12 0.2 21533 13.5
13 0.2 22412 14
10 0.2 24566 15.4
9 0.1 21423 13.4
9 0.1 24566 15.4
8 0.2 21452 13.4
10 0.3 21633 13.5
9 0.1 22424 14
Mean Flex Mean Comp
0.21 14.03
Fail flex Flex Str. Fail Comp Comp. Str.
5 0.1 19566 12.2
6 0.1 20324 12.7
6 0.1 25421 15.9
5 0.1 24133 15.1
5 0.1 21533 13.5
6 0.1 22412 14
9 0.2 24566 15.4
1 0.1 21423 13.4
5 0.1 24566 15.4
4 0.1 21452 13.4
7 0.2 21633 13.5
3 0.1 22424 14
Mean Flex Mean Comp
0.12 14.03

0–10mm. Dolomite Graded

Fail flex Flex Str. Fail Comp Comp. Str.
74 1.7 32562 20.4
98 2.3 31562 19.7
92 2.2 32499 20.3
99 2.3 31560 19.7
75 1.8 35623 22.3
62 1.5 31445 19.7
84 2 32456 20.3
96 2.2 34775 21.7
85 1.7 29856 18.7
94 2.3 34520 21.6
97 2.1 33420 20.9
93 2.2 33482 20.9
Mean Flex Mean Comp
2.03 20.51

Blast Furnace Slag

0–10 Blast Furnace Slag 5% ecoProactive™ 10% Moisture content
Fail flex Flex Str. Fail Comp Comp. Str.
22 0.5 24566 15.4
21 0.5 22356 14
26 0.6 24752 15.5
24 0.6 24762 15.5
21 0.5 24763 15.5
27 0.6 22741 14.2
23 0.5 21563 13.5
24 0.6 25744 16.1
18 0.4 26575 16.6
21 0.5 24355 15.2
19 0.4 22145 13.8
25 0.6 24525 15.3
Mean Flex Mean Comp
0.53 15.04

Indirect Tensile Strength Comparison

Granular Sub Base
As granular sub base is an unbound material it has no theoretical Tensile Strength
30MPA Compressive Strength Concrete is in the range 2.2–2.7
Dry Lean Concrete Indirect Tensile Strength is in the range 0.8–1.1