A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development of a prediction model for degree of blending between rap binder and virgin binder
When RAP is mixed with the virgin binder and aggregates, all the RAP binder does not mobilize and interact with virgin binder and aggregates due to partial degree of blending. This partial degree of blending impacts the amount of effective binder that is present in the mix, which will affect the Superpave volumetric properties and performance of the mix. If the degree of blending is estimated to be too high, then under asphalting will occur, leading to premature cracking. Choosing a degree of blending too low will result in over asphalting which could lead to low air void content and rutting. The researchers developed the degree of blending was determined based on effective binder content. However, the variables such as gradation of the RAP aggregates, moisture content of the RAP, and properties of the RAP and virgin binder affect the degree of blending. A study that captures both the variables that are site specific within RAP stockpiles, along with possible change to the RAP stockpiles, need to be conducted in order to accurately predict the degree of blending in high RAP hot mix asphalt. Therefore, it is critical to develop a model to estimate the degree of blending. The RAP data was collected from three asphalt plants in New Jersey and degree of blending was measured using one virgin binder grade of PG 76-22. A model to predict degree of blending was developed. The model was validated by measuring RAP properties and degree of blending of25% RAP plant mixtures.
Development of a prediction model for degree of blending between rap binder and virgin binder
When RAP is mixed with the virgin binder and aggregates, all the RAP binder does not mobilize and interact with virgin binder and aggregates due to partial degree of blending. This partial degree of blending impacts the amount of effective binder that is present in the mix, which will affect the Superpave volumetric properties and performance of the mix. If the degree of blending is estimated to be too high, then under asphalting will occur, leading to premature cracking. Choosing a degree of blending too low will result in over asphalting which could lead to low air void content and rutting. The researchers developed the degree of blending was determined based on effective binder content. However, the variables such as gradation of the RAP aggregates, moisture content of the RAP, and properties of the RAP and virgin binder affect the degree of blending. A study that captures both the variables that are site specific within RAP stockpiles, along with possible change to the RAP stockpiles, need to be conducted in order to accurately predict the degree of blending in high RAP hot mix asphalt. Therefore, it is critical to develop a model to estimate the degree of blending. The RAP data was collected from three asphalt plants in New Jersey and degree of blending was measured using one virgin binder grade of PG 76-22. A model to predict degree of blending was developed. The model was validated by measuring RAP properties and degree of blending of25% RAP plant mixtures.
Development of a prediction model for degree of blending between rap binder and virgin binder
Coffey, Sean (author) / Mehta, Yusuf A. (author) / Kehr, Dan (author)
2012
12 Seiten, 3 Bilder, 8 Tabellen, 4 Quellen
Conference paper
English
Tracking Degree of Blending Between Recycled and Virgin Binder Through Asphalt Mix Phase Angle
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