A curing model for epoxy asphalt concrete and its implementation for construction

作者：Cao Xuejuan; Lei Yunbo; Wang Wei; Tang Boming^*

来源：International Journal of Pavement Research and Technology, 2011, 4(3): 140-146.

• Asphalt concrete pavements
• Asphalt concretes
• Conversion rates
• Curing rates
• Curing reaction kinetics
• Curing time
• Diffusion control
• Epoxy asphalt concrete
• Epoxy systems
• High temperature
• Kinetics method
• Kissinger equation
• Marshall stability
• Maximum temperature
• Non-isothermal analysis
• Non-linear regression method
• Pavement temperature
• Reaction energy
• Reaction model
• Speed rates
• Summer season
• Temperature rise
• Thermal analysis kinetics
• Thermokinetics

The curing reaction kinetics of epoxy system in epoxy asphalt concrete was studied by means of non-isothermal analysis kinetics method combined with linear heating-up data of differential scanning calorimetry (DSC) at several scan speed rates. Taking advantage of Netzsch Thermokinetics Diffusion Control software, a precise model of this reaction was obtained by Friedman differential and nonlinear regression methods. The reaction energy and order can be solved with Kissinger equation and crane equation. Using this model, the conversion rate can be calculated under given conditions. The results show that temperature rise can greatly shorten the required curing time. The results also show that the time of conversion rate reaching 80 percent is much shorter than that of complete curing. The curing rate is over ten times when the pavement temperature is at 60°C than at 30°C. Therefore, it is recommended that epoxy asphalt concrete pavement be constructed in high-temperature season. Usually, the pavement temperature exceeds 30°C in a whole day and the maximum temperature can reach up to 60°C during hot summer season. Under this condition, the conversion rate reaches 80 percent in two weeks with the Marshall Stability value nearly reaching 40 kN, which is a value advised to open the pavement to traffic.

• 出版日期2011