PSI - Issue 70

Vinod Kumar et al. / Procedia Structural Integrity 70 (2025) 303–310

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Further, the impact of combined performance on UCS of mix can be observed in Fig. 9. The UCS in this case also increases due to the inclusion of the 5% BD. After this improvement in the UCS, the decrease is up to 20% BDC. Further inclusion of the BD increases the UCS of the mix. By comparing the UCS of Fig. 7 and Fig. 9, it can be observed that in all the cases, the UCS of the soil mixed with cement and BD is much higher than the UCS of the soil mixed with BD alone. This indicates that the BD's performance improves significantly when cement is added. The improvement factor for 5% BD alone is about 1.44, while with cement it is about 3.81. A similar type of behavior can be observed for all the content. Even for BD at 20%, cement significantly improves soil load carrying capacity. This indicates the potential to enhance the UCS for cement and BD combined is much greater than in individual form. A similar mix of behavior was found for CP 14 days and 28 days.

S+C 6%+BKD 5%

S+C 6%+BKD 10%

S+c 6%+BKD 15%

0 200 400 600 800 1000

STRESS (KPA)

0

1

2

3

4

5

6

7

8

AXIAL STRAIN (%)

Fig. 8. stress-strain behavior of LS mixed with brick dust and cement (CP=7 days)

UCS values of soil mixed with cement and BD at 7 days

0 100 200 300 400 500 600 700 800 900 1000

902.04

808.95

785.49

701.89

674.38

622.31

599.16

UCS (kPa)

5

10

15

20

30

40

50

BKD (%)

Fig. 9. UCS of Soil mixed with cement and BD

4. Conclusion A series of UCS tests were conducted to check the potential of cement and BD to improve soil strength. From the results, the following conclusions may be drawn. • Both cement and brick dust enhance the UCS and stiffness of soil.