ANEXO II: Juego “las cartas de las rocas” utilizado en el rincón “El ciclo de las rocas” (ver fotografía 8):
1. FUNDAMENTACIÓN TEÓRICA La diversidad en el aula
4.4.3.1 STATISTICAL COMPARISON OF MEAN MODULUS OF RUPTURE Table 4.35 compares the mean modulus of rupture (MOR) of basalt bundle beam specimens with that of basalt filament beam specimens of same fibre length and quantity.
The following is the summary of observations.
For short (12 mm) fibres, the change in MOR between bundles and filaments for all fibre dosages (4 kg/m3,8 kg/m3, and 12 kg/m3) is not statistically significant at both 90% and 95% confidence intervals.
For medium length (36 mm) fibres, the change in MOR between bundles and filaments for 4 kg/m3 and 12 kg/m3 is not statistically significant at both 90% and 95% confidence intervals. However, it is statistically significant for 8 kg/m3 at both 90% and 95% confidence intervals.
For long (50 mm) fibres, the change in MOR between bundles and filaments for 4 kg/m3 is statistically significant at 90% CI, however, it is not statistically significant at 95% CI. The change in MOR between bundles and filaments for 8 kg/m3 and 12 kg/m3 is not statistically significant at both 90% and 95%
confidence intervals.
Table 4.35: Basalt bundles vs. Basalt filaments: MOR: Independent sample t-test Sample
BB 12-4 BF 12-4 0.19 -0.34 Accept Accept
BB 12-8 BF 12-8 0.26 0.51 Accept Accept
BB 12-12 BF 12-12 0.06 2.13 Accept Accept
BB 36-4 BF 36-4 0.25 0.98 Accept Accept
BB 36-8 BF 36-8 0.05 7.46 Reject Reject
BB 36-12 BF 36-12 0.25 -0.60 Accept Accept
BB 50-4 BF 50-4 0.19 -2.45 Accept Reject
BB 50-8 BF 50-8 0.17 0.63 Accept Accept
BB 50-12 BF 50-12 0.16 -1.58 Accept Accept
Degree of freedom (nA + nB - 2) = 4, t , = ± 2.776 at 95% confidence level, and t , =
± 2.132 at 90% confidence level (Appendix A) for all the above sample groups.
4.4.3.2 STATISTICAL COMPARISON OF MEAN COMPRESSIVE STRENGTH Table 4.36 compares the 28 day compressive strength of basalt bundle cylinder specimens with that of basalt filament cylinder specimens of same fibre length and quantity. The following is the summary of observations.
For short (12 mm) fibres, the change in compressive strength between bundles and filaments for 4 kg/m3 and8 kg/m3 is not statistically significant at both 90% and 95% confidence intervals. The change in compressive strength between bundles and filaments for 12 kg/m3 is statistically significant at 90% CI, however, it is not statistically significant at 95% CI.
For medium length (36 mm) fibres, the change in compressive strength between bundles and filaments for 4 kg/m3 is not statistically significant at both 90% and 95% confidence intervals. However, it is statistically significant for 8 kg/m3 and 12 kg/m3 at both 90% and 95% confidence intervals.
For long (50 mm) fibres, the change in compressive strength between bundles and filaments for 4 kg/m3 and 12 kg/m3 is not statistically significant at both 90% and 95% CI. The change in compressive strength between bundles and filaments for 8 kg/m3 is statistically significant at 90% CI, however, it is not statistically significant at 95% CI.
Table 4.36: Basalt bundles vs. Basalt filaments: Compressive strength:
Independent sample t-test
BB 12-4 BF 12-4 0.99 -1.37 Accept Accept
BB 12-8 BF 12-8 1.49 1.25 Accept Accept
BB 12-12 BF 12-12 0.82 -2.54 Accept Reject
BB 36-4 BF 36-4 2.94 -0.46 Accept Accept
BB 36-8 BF 36-8 0.42 -13.65 Reject Reject
BB 36-12 BF 36-12 1.19 -7.94 Reject Reject
BB 50-4 BF 50-4 1.63 -0.41 Accept Accept
BB 50-8 BF 50-8 2.70 -2.23 Accept Reject
BB 50-12 BF 50-12 2.24 -1.83 Accept Accept
Degree of freedom (nA + nB - 2) = 4, t , = ± 2.776 at 95% confidence level, and t , =
± 2.132 at 90% confidence level (Appendix A) for all the above sample groups.
4.4.3.3 STATISTICAL COMPARISON OF MEAN SPLIT TENSILE STRENGTH Table 4.37 compares the split tensile strength of basalt bundle cylinder specimens with that of basalt filament cylinder specimens of same fibre length and quantity. The following is the summary of observations.
For short (12 mm) fibres, the change in split tensile strength between bundles and filaments for all fibre dosages (4 kg/m3, 8 kg/m3, and12 kg/m3)is not statistically significant at both 90% and 95% confidence intervals.
For medium length (36 mm) fibres, the change in split tensile strength between bundles and filaments for 4 kg/m3 and 8 kg/m3 is not statistically significant at both 90% and 95% confidence intervals. The change in split tensile strength between bundles and filaments for 12 kg/m3 is statistically significant at 90% CI, however, it is not statistically significant at 95% CI.
For long (50 mm) fibres, the change in split tensile strength between bundles and filaments for all fibre dosages (4 kg/m3, 8 kg/m3, and12 kg/m3)is not statistically significant at both 90% and 95% confidence intervals.
Table 4.37: Basalt bundles vs. Basalt filaments: Split tensile strength:
Independent sample t-test
BB 12-4 BF 12-4 0.35 -0.68 Accept Accept
BB 12-8 BF 12-8 0.35 0.38 Accept Accept
BB 12-12 BF 12-12 0.35 2.07 Accept Accept
BB 36-4 BF 36-4 0.41 -0.49 Accept Accept
BB 36-8 BF 36-8 0.52 -0.88 Accept Accept
BB 36-12 BF 36-12 0.41 -2.61 Accept Reject
BB 50-4 BF 50-4 0.22 -1.80 Accept Accept
BB 50-8 BF 50-8 0.36 -1.13 Accept Accept
BB 50-12 BF 50-12 0.65 -0.69 Accept Accept
Degree of freedom (nA + nB - 2) = 4, t , = ± 2.776 at 95% confidence level, and t , =
± 2.132 at 90% confidence level (Appendix A) for all the above sample groups.
4.5 SUMMARY
Basalt bundles vs. control specimens: The medium length (36 mm) and long (50 mm) bundled fibres at high fibre dosage of 12 kg/m3 are statistically similar to SF 38-40 in flexural strength, and compressive strength. The change in split tensile strength of 36 mm bundled fibre at 12 kg/m3 is statistically significant when compared with PC, SF 38-40 or PP 40-4.5 specimens.
Basalt bundles - Effect of length and dosage: The change in basalt bundled fibre length from 12 mm to 50 mm for all fibre dosages (4 kg/m3, 8 kg/m3, and12 kg/m3) has statistically significant influence on the flexural strength. For short bundled fibre (12 mm), the effect of fibre quantity has significant influence on flexural strength and compressive strength only when the fibre dosage increases from 4 kg/m3 to 12 kg/m3. The fibre dosages of 8 kg/m3 and 12 kg/m3 for 36 mm and 50 mm bundled fibres, statistically have significant influence on flexural strength and compressive strength. The change in bundled fibre length from 12 mm to 36 mm at high dosage of 12 kg/m3 has significant influence on the split tensile strength.
Basalt filaments vs. control specimens: None of the basalt filament specimens have similar flexural strength as SF 38-40 specimen. The 36 mm filament at 8 kg/m3, and 50 mm filament at 8 kg/m3 and 12 kg/m3 provide similar flexural strength as PP 40-4.5 specimen. All basalt filament specimens provide compressive strength similar to PP 40-4.5, except 50 mm filament at 12 kg/m3 which provides compressive strength similar to SF 38-40 specimen. The change in split tensile strength of 12 mm filament at 12 kg/m3 is statistically significant when compared with PC, SF 38-40 or PP 40-4.5 specimens.
Basalt filaments - Effect of length and dosage: The change in filament fibre length from 12 mm to 36 mm or 12 mm to 50 mm at 8 kg/m3 has significant influence on the flexural strength. For 12 mm and 50 mm filaments, the change in filament fibre
quantity from 4 kg/m3 to 8 kg/m3 or 4 kg/m3 to 12 kg/m3 has significant influence on the flexural strength. The change in filament fibre length from 12 mm to 50 mm or 36 mm to 50 mm at 12 kg/m3 has significant influence on the compressive strength. The change in fibre length from 12 mm to 50 mm at 4 kg/m3 has significant influence on the split tensile strength. There is no significant influence of fibre quantity on compressive strength and split tensile strength, for all fibre lengths (12 mm, 36 mm, and 50 mm).
Basalt bundles vs. Basalt filaments: The flexural performance of both bundled fibres and filaments of same length and quantity are statistically similar, except for 36 mm fibres at 8 kg/m3. The compressive strength of both bundled fibres and filaments are statistically similar, except for 36 mm fibres at 8 kg/m3 and 12 kg/m3. The split tensile strength of both bundled fibres and filaments are statistically similar, except for 36 mm fibres at 12 kg/m3.