Issue 57

T. Boudina et alii, Frattura ed Integrità Strutturale, 57 (2021) 50-62; DOI: 10.3221/IGF-ESIS.57.05

Furthermore, this optimization also showing that HPC can be produced with recycled sands from brick and concrete waste and makes it possible to achieve better properties to natural HPCs (HPC 15).

12 16 20

4 8

Slump

17,94657

±1,492573 70 74 78 82 83,20075

CS at

28 days

±1,650032

9,5 10,5 11,5 12,5

FS at

28 days

11,7727

±0,388898 45 50 55 60 65 ±2,350702

CS at

7 days

57,8667

7 7,5 8 8,5 9

FS at

7 days

7,636183

±0,198746

Désirabilité 0,64979 Desirability

0 0,5 1

0

0

1

0

1

0

1

1

0,2

0,4

0,6

0,8

0,2

0,4 0,095431 RBA 0,6

0,8

0,2

0,4 0,904569 RCA 0,6

0,8

0,5

0 NS

0,25

0,75

Désirabilité Desirability

Figure 8: Prevision profiler for predicting optimal conditions for the formulation of recycled fine aggregate BHP.

C ONCLUSIONS

T

he present research aimed mainly at assessing the effects of incorporating brick waste aggregates and concrete demolition waste aggregates on the physico-mechanical properties of concrete. Through experimental tests and analyses of each formulation, which contains different factors, with various substitution rates, and using the mixture design approach, it was found that a good agreement exists between the results of the mathematical models and those of the experimental tests, which validates the various considerable data on the effects of each of the recorded parameters. In light of the outcomes got right now, the following ends could be drawn: - The modelling of the mixture design method utilized right now has demonstrated to be a powerful procedure for considering the impacts of the three types of sand (NS 0/4, RBA 0/4 and RCA 0/4) in binary and ternary frameworks on the fresh and hardened concrete states. The advantage of modelling results studied using the

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