Cold asphalt mixtures with high reclaimed pavement material percentages response to local traffic loading and environmental conditions

2nd International Conference on Engineering Sciences

Al-Jumaili, M.A.^1 ; Issmael, O.D.^2

Civil Engineering Department, University of Kufa, Iraq^1

Highway and Transportation Department, University of Al-Mustansiriah, Iraq^2

关键词: Cold recycling;    Environmental conditions;    Indirect tensile strength;    Moisture damage;    Moisture sensitivity;    Performance evaluations;    Permanent deformations;    Reclaimed asphalt pavements;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/433/1/012013/pdf
DOI  :  10.1088/1757-899X/433/1/012013

来源: IOP

【 摘 要 】

Older asphalt materials can be recycled using cold, warm, or hot output methods, and the addition of emulsion ingredients, water, and new aggregates to the old asphalt pavement can be completed either in plant or on site. Cold recycling is desirable, but there is little equipment available to processes in-place recycling of this type to enable structural and material problems to be corrected quickly without much disruption to trafficV8For the purposes of assessing the performance of asphalt emulsion recycling mixtures, a cold recycling mix was designed with steps including original material selection, gradation design, adding cement as a filler material, and performance evaluation. Few investigations have been done to assess the tensile and compressive strengths, moisture sensitivity, and rutting of recycled cold mixtures with local materials containing a high percentage of reclaimed asphalt pavement (RAP) of up to 90%. There is thus a need to assess the performance of recycled cold mixtures, especially where they contain high proportions of reclaimed pavement materials that will already have been exposed to local conditions. Recycled cold mixture behaviour has been characterised by its compressive strength, indirect tensile strength, moisture sensitivity, and rut depth. Testing program results showed that cold mixtures containing high percentages of RAP at the end of the various curing periods (1, 7, 14, and 28 days) provided better resistance to permanent deformation, moisture damage, and tensile stresses than a control cold mix with no reclaimed pavement materials. This improved behaviour may be explained by the increase in recycled cold mix stiffness, which offers high RAP and cement bonding with appropriate curing times.