PSI - Issue 28

Chbani Hamza et al. / Procedia Structural Integrity 28 (2020) 430–439 Author name / Structural Integrity Procedia 00 (2019) 000–000

432

Fig. 1. (a) Weighing of the pycnometer filled with the mixture (water +aggregates); (b) Drying of the aggregates sample by a heat source (Dryer).

( M M M M   4





(1)

absolute

)

4

2

3

( M M M M   4

real  

(2)

)

1

2

3

( 100

)

1 M M M

 

W



4

(3)

A24

4

The results of the densities and coefficient of water adsorption for the used aggregates are summarised in Table 1. Table 1. Densities and coefficient of water adsorption for used aggregates

Test 1

Test 2

Test 3

Average Standard deviation

M1 (g)

1500

1500

1500

1500,00

0,00

M2 (g)

3555,7

3553,9

3557,4

3555,67

1,75

M3 (g) M4 (g)

2605,5 1494,8

2604,0 1492,2

2605,9 1496,3

2605,13 1494,43

1,00 2,07 0,01 0,01 0,14

ρ absolute (g/cm

3 )

2,74

2,75

2,74

2,74

ρ real (g/cm

3 )

2,72 0,34

2,71 0,52

2.72 0,24

2,72 0,37

W A24 (%)

From the founded results, we notice that the aggregates had a low coefficient of water absorption and a slight difference between absolute and real density. Therefore, we find that the disposed aggregates are of the non-absorbent type. 2.2 Compactness In practice, compactness is the ratio of the apparent density to the real density. The purpose of the test is to measure the compactness of a granular sample of a well defined weight when subjected to a conventionally defined mechanical stress in a cylinder. The experimental device for the compactness test shall consist of a mould in the form of a hollow