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OCR for page 41
41
3
Sample B1 2.22 %
2.5
2.15 %
2
STRAIN (%)
REFERENCE TEMPERATURE - 23C
1.5
100 Yrs
500 psi Stress
1 50 Yrs
0.5
0
-4 -3 -2 -1 0 1 2 3 4 5 6 7
LOG TIME (hr)
Figure 40. Creep strain master curve for Sample B1.
200000
180000
Sample B1
160000 50 Yrs 100 Yrs
CREEP MODULUS (psi)
140000
120000
100000
80000
60000
23,250 psi
40000 22,531 psi
REFERENCE TEMPERATURE - 23C
20000 500 psi Stress
0
-3 -2 -1 0 1 2 3 4 5 6 7 8
LOG TIME (hr)
Figure 41. Creep modulus master curve for Sample B1.
Next, the SIM was used to determine the creep properties The raw data and the master creep curves for these samples
of the samples when placed under an applied stress of 500 psi. are found in Appendix D, Section D.12. These results will be
This involves a series of 10,000 second (166 min) creep tests, used to evaluate how one would design with recycled formu-
each done on the same test specimen and separated by 7°C lations in the context of Section 12 of the AASHTO LRFD
in temperature. In this case, creep curves were generated Bridge Design Specifications (15).
from 20°C to 83°C. The raw data are then shifted through
TTS to generate a master creep curve at a reference tempera-
Long-Term Stress-Crack Resistance
ture (23°C). Creep strain and creep modulus master curves
for sample B1 (100% VR1) are shown in Figures 40 and 41, The six final candidate formulations and the PCR MCR resin
and all of the results are shown in Table 17. were evaluated by the BFF test under the three sets of conditions
Table 17. Long-term creep strain and creep modulus under
500 psi of stress.
Creep Strain Creep Modulus
Sample 50 year 100 year 50 year 100 year
B1 2.15 2.22 23,250 22,531
A2 2.07 2.14 24,160 23,358
L5 2.22 2.30 22,549 21,719
A5 2.19 2.26 22,821 22,091
B3 2.24 2.32 22,300 21,532
B5 2.64 2.72 18,965 18,406
