Hydrated Lime Lab Report

Hydrated Lime The results show that hydrated lime increased the intermediate temperature stiffness of the PG 64 - 22 binder. Hydrated lime showed to improve the fatigue properties of the aged binder. It could decrease the fatigue parameter by 23% which is a desired result when cracking due to aging is a concern. The mixing was done at three percentages: 1%, 2%, 3% . The lowest aging index was found to be at 2% by weight of the binder. At this percentage, the decrease in long term aging index came out to be 30%. Hydrated lime was also tested with 67 - 22 binder. The greatest decrease in aging was found to be at 2% and 3% hydrated lime which is around 14%. The results can be seen in table 2.

BNX 1010 BNX 1010 was mixed with both PG 64

These novolac resins that are formed could act as antioxidants to reduce the aging of the binder. As fufural reacts with the aromatic phenols instantly, this could possibly help in retarding the oxidation in the asphalt binder(7). A 12M concentrated hydrochloric acid was chosen for the study. As the table 1 shows, furfural was mixed with asphalt in presence of hydrochloric acid as catalyst. The percentage of acid selected for the mixing was 1.1% and 1.5% with 2% furfural. This mixing was carried out on the 60 - 70 binder. The results show that, this combination tends to make the binder stiffer than original. It decreased the fatigue resistance of the binder by increasing the fatigue parameter of the pav aged material. The results can be seen in table 1.This combination can be used with antioxidants that relatively soften the binder to get the desired stiffness. Thus, redicote ap and dltdp were selected to mix with this

The other additives that showed great decrease in aging are Solprene 1205 and Calprene 6120. Solprene 1205 seemed to be working well with the 64-22 binder and Calprene 6120 showed high reduction in aging with 67-22 binder. Frequency sweep tests were performed on the binders modified with antioxidant additives to learn about the impact of these additives on linear viscoelastic properties of the binders. The testing was done on both unaged and PAV aged samples. The frequency sweep test was done at 7 temperatures: 10,20,30, 40, 50, 60 and 70ºC and 10 frequencies at each temperature. The frequencies selected were 37.5, 30, 25, 20,15,10,5, 1, 0.5 and 0.1 Hz. The 8mm diameter plate was used to test the sample from 10 -30ºC and 25mm diameter plate was used for temperatures greater than 30ºC. The data obtained through experimentation are shifted by temperature along the logarithmic frequency axis to form a continuous curve. The time - temperature shift factor can be expressed as