PSI - Issue 25

Zuzana Marcalikova et al. / Procedia Structural Integrity 25 (2020) 27–32 Author name / Structural Integrity Procedia 00 (2019) 000–000

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3

Laboratory tests for numerical modelling determine compressive strength - f c,cube - cube 150x150x150 mm, splitting tensile strength perpendicular to filling direction - f ct,sp, ⊥ - cube 150x150x150 mm, f ct,sp, , bending tensile strength - f ct, fl - beams 150x150x700 mm (with end bends - series 1), resp. 150 x 150 x 600 mm (straight and short - series 2) with a 50 mm notch in the middle of the span. The test scheme for test compressive strength is shown in Fig. 2 (a).

Table 2. General characteristics of concrete mixture.

Consistency

S3

Cement

42.5

Min. cement content

320 kg

Water-cement ratio: v/c

0.625

Fine aggregate

945 kg

Coarse aggregate *

970 kg

Water

200 l

Plasticizer

3.2 l

Notes: * maximum aggregate size of 16 mm

Fig. 2. (a)Test schema for compressive strength; (b) Test schema for splitting tension strength (perpendicularly to the filling direction).

Splitting tensile strength perpendicularly to the filling direction is calculated according to formula (1), where P max is the maximum force in the test press, l is the length of contact line of the body and b is the lateral dimension of the body. The test scheme is shown in Fig. 2 (b).

= π 2

l b P max

f

(1)

ct,sp

Bending tensile strength for the three-point distribution in the test according to formula (2).

( 3 b h a P L 0 max

=

f

) 2

(2)

c,fl

2

The bending tensile strength for the three-point was determined to formula (5) where P max is the maximum load, L is span, b is width, h is height, a 0 is the notch height and e is the distance between support and force. The test scheme for three-point bending test is shown in Fig. 3.