to Moisture Dama The impact of lime and liquid anti-strip additives on the mixtu
ID: 3321643 • Letter: T
Question
to Moisture Dama The impact of lime and liquid anti-strip additives on the mixtures' resistance to moisture damage is evaluated using the indirect tensile strength test. Three types of mixtures were designed: un-treated (no anti-strip additive, 2- liquid-treated (liquid anti-strip added to binder) 3- lime-treated (hydrated lime added to aggregate) For each mixture type two values for the indirect tensile strength (TS) are calculated: TSa (dry or unconditioned) and TSw (wet or conditioned, i.e. after one freeze-thaw (F-T) cycle). Then, the tensile strength ratio (TSR) is calculated by: TSR = (TSw/ TSJ. 100 All mix designs are conducted following the Superpave volumetric mix design method with a minimum dry tensile strength of 70 psi at 77"F and minimum tensile strength ratio (TSR) for the treated mixtures of 80% Tables 1 and 2 show the tensile strengths obtained for cach mixture. Table 1. Unconditioned tensile strength (TSu), in psi Un-treated Liquid-treatedLime-treated 152.3 157.1 152.1 157.4 156.7 153.2 149.7 151.1 154.1 154.6 151.4 146.6 160.1 167.4 164.1 59.3 164.1 160.7Explanation / Answer
The data is:
The one way ANOVA results are:
(a)
Overall average = 156.22
The ANOVA results are:
(b)
Total sum of squares SST = 529.2711
(c)
Treatment sum of squares SS Treatment = 386.3965
(d)
Error sum of squares = SSE = 142.8746
(e)
The completed ANOVA table is:
(f)
Conclusion:
The F statistic value for the effect due to the treatments = 20.2833
The critical F value = 3.68232 at 0.05 level of significance
F statistic is greater than the critical F value.
So,we reject null hypothesis H0 that the mean unconditioned tensile strengths is same for the three treatments.
Thus, we conclude that the mean unconditioned tensile strengths is not same for the three treatments.
un-treated liquid-treated lime-treated 151.1 152.3 160.1 154.1 157.1 167.4 154.6 152.1 164.1 151.4 157.4 159.3 146.6 156.7 164.1 153.2 160.7 149.7Related Questions
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