Improving The Properties Of Rap For Base Course Application By Blending Rap With A 3 Soil And Chemical Stabilization Using Asphalt Emulsion And Portland Cement

Download or read book Improving the Properties of RAP for Base Course Application by Blending RAP with A-3 Soil and Chemical Stabilization Using Asphalt Emulsion and Portland Cement written by Rasha Riadh Salem AL-Obaydi and published by . This book was released on 2014 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this research was to evaluate the effects of adding a combination of two stabilizing agents to blends of reclaimed asphalt pavement (RAP) with A-3 soil for use in a pavement base course. The California Bearing Ratio (CBR) and Marshall Stability tests were conducted on the blends to evaluate strength. Marshall flow and one-dimensional creep tests were performed to evaluate deformation. The test procedure in this study included one RAP/soil blend (75% RAP with 25% A-3 soil by weight) with five cement contents (0.0, 0.5, 1.0, 1.5, and 2.0% of type IIII Portland cement) and five asphalt emulsion contents (0.0, 0.5, 1.0, 1.5, and 2.0% of asphalt emulsion) added as chemical stabilizing agents. 100% pure RAP and 100% pure A-3 soil were also tested for CBR, Marshall Compression and Creep in order to set as a baseline to evaluate the improvement when the stabilizing agents were added.Results from this study showed that the unstabilized blends did improve in the strength compared to RAP or A-3 soil alone, but the blends did not meet the strength requirement for a base course material. Several combinations of chemical stabilizing agents increased the soaked CBR strength of the stabilized blends to between 76 and 78, but did not meet the standard of 80. Increasing cement content led to a linear increase in strength and reduced creep while increasing asphalt emulsion showed peak strength and creep reduction at between 1% and1.5% followed by a decrease in strength and increased creep at higher emulsion content. A strong linear positive correlation was found between the CBR and Marshall stability while a very weak positive correlation was observed between creep strain rate (CSR) and Marshall flow.