Static and Dynamic Properties and Temperature Sensitivity of Emulsified Asphalt Concrete

Abstract

Asphalt concrete is a typical rheological material, which is hard brittle at low temperature and reflects soft plastic facture at high temperature; the temperature has a great influence on the mechanical properties of asphalt concrete. In order to eliminate the environmental pollution caused by hot asphalt construction, cationic emulsified asphalt can be used. is paper transforms the temperature control system for static and dynamic triaxial test equipment, which has achieved static and dynamic properties of emulsified asphalt concrete under different temperatures, and researched the temperature sensitivity of emulsified asphalt concrete materials including static stress-strain relationship, static strength, dynamic modulus of elasticity, damping ratio, and so on. e results suggest that (1) temperature has a great influence on the triaxial stress-strain relationship curve of the asphalt concrete. e lower the temperature, the greater the initial tangent modulus of asphalt concrete and the higher the intensity; the more obvious the softening trend, the smaller the failure strain of the specimen and the more obvious the extent of shear dilatancy. When the temperature is below 15.4°C, the temperature sensitivity of the modulus and strength is stronger significantly. (2) With the temperature rising, the asphalt concrete gradually shifts from an elastic state to a viscoelastic state, the dynamic modulus gradually reduces, and the damping ratio increases. When the temperature is above 15.4°C, the temperature sensitivity is obviously stronger for the dynamic elastic modulus and damping ratio. (3) e static and dynamic properties of asphalt concrete are very sensitive to the temperature. e test temperature should be made clear for the static and dynamic tests of asphalt concrete.e specimen temperature and the test ambient temperature must be strictly controlled.

Performance of Concrete Structure after Fire Disaster Based on Thermal Stress Coupling Field Analysis

“…For most of the large public buildings and special industrial structures, the key parts are generally built using new-type structures made of steel and concrete [1][2][3][4][5][6][7][8][9]. Although concrete structures have good corrosion resistance and durability, they are a kind of non-combustible material, and their mechanical properties are quite sensitive to temperature [10][11][12][13][14][15][16]. Since concrete structure buildings are prone to fire disaster with fast temperature rise and heavy smoke accumulation, once the temperature exceeds the limit temperature of steel and concrete, the structure of the building will be broken, and the bearing capacity and safety performance of the rest parts will be irreversibly weakened, thereby making the overall structure of the building be easily damaged or even collapse in severe cases [17][18][19][20][21].…”

Uniaxial Dynamic Compressive Behaviors of Hydraulic Asphalt Concrete under the Coupling Effect between Temperature and Strain Rate

“…S. Pirmohammad et al [ 7 ] carried out three-point fracture tests and found that the fracture resistance of hydraulic asphalt concrete first increased and then below a certain temperature (−20 °C) decreased. Huang et al [ 8 ] suggested that following the addition of temperature, the initial tangent modulus and failure strain of hydraulic asphalt concrete increases significantly employing experiments on the temperature sensitivity of asphalt concrete. Studies investigating the mechanical properties of hydraulic asphalt concrete were carried out using uniaxial compression tests and triaxial compression tests by Wang [ 9 ] and Zhang [ 10 ].…”

“…Ning [ 17 ] employed the hydraulic servo device to test the dynamic compressive features of hydraulic asphalt concrete at various temperatures and he reported that the failure modes of hydraulic asphalt concrete present distinct strain rate effect under various temperatures. Huang [ 8 ] analyzed the dynamic characteristics of asphalt concrete using a dynamic triaxial machine with an adjusted temperature control system. As the impermeable core in dams, hydraulic asphalt concrete has a relatively high bitumen content and excellent temperature sensitivity.…”