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Otani et al. (2005) showed similar drop in compressive strength for pervious recycled aggregate concrete.
Similar drop in compressive strength of 60% was observed with LMM specimen with high CNTs content of 1.5%.
It can also be noted that LMM specimens with the moderate and low CNTs contents (i.e. 0.5 and 1.0%) were more stable under thermal fatigue cycles as they demonstrated statistically insignificant or no drop in compressive strength after 300 cycles.
For freeze thaw testing, after 150 cycles, the LMM control samples experienced a drastic drop in compressive strength; however, it gained part of the lost strength (about 50%) after 300 cycles.
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The student t-test also shows that the drop and regain in compressive strength for all CNTs contents is statistically significant.
For thermal fatigue test, the addition of low-to-moderate CNTs contents maintained the compressive strength unaffected by the thermal cycles whereas a drastic drop of 70% in compressive strength was observed in the control specimen.
For thermal fatigue testing (Fig. 5), no regain was observed in compressive strength after 300 cycles, instead a drastic drop was observed.
The increase in compressive strength reaches 33%.
Table 5 Results obtained in compressive strength tests (MPa).
Slight increase in compressive strength was observed at 28 days.
Flexural strength was found varying in a similar fashion as was seen in compressive strength trend.
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