Issue 59

T. Djedid et alii, Frattura ed Integrità Strutturale, 59 (2022) 566-579; DOI: 10.3221/IGF-ESIS.59.37

Sand

Gravel

CG 3/8 1.43

Type

RS

CS

8/16 1.40

Apparent volumetric mass (g/cm 3 )

1.65

1.44

Absolute volumetric mass (g/m 3 ) 2.55

2.55 2.62

2.72

2.45

Fineness modulus Compactness (%)

2.29

-

-

62 38 61

56 44 78

52 48 92

57 43 75

Porosity (%) Void ratio

(%)

Visual Sand equivalent (%) Piston Sand equivalent (%) Aggregate cleanness (%) Water absorption after 24 h (%) Flatness coefficient (%) Los Angeles testing (%)

71.37 72.65

80.87 82.60

- -

- -

-

-

98.84 2.38

99.95

2.13

4.1

3

- -

- -

17 24

14 25

Water content (%) Methylene blue test

1.73

0.6 0.8

0.45

0.45

1.5

-

-

Table 2: Physical, mechanical and chemical properties of aggregates.

Figure 1: Size analysis of the studied aggregates.

E XPERIMENTAL PROCEDURES

wo tests were carried out in the fresh state, the first is the Abrams cone slump test according to the specification of EN 12350-2 [17]. The other is the density determination test according to the recommendations of EN 12350 6 [18]. The aim was to optimize the water and super plasticizer dosage to reduce the overall pore volume [19]. Three types of moulds were used, 100×100×100 mm cubes for compressive strength, 70×70×280 mm prisms for flexural strength, and 110×220 mm cylinders for tensile strength (Brazilian test). The execution of these mechanical strengths is performed according to the European standards, i.e. EN 12390-3, EN 12390-5 and EN 12390-6 respectively [20-22].

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