A Study of the Impact Resistance of Rubber Concrete at Low Temperatures (−30°C)

Abstract

In the present study, the impact resistance of rubber concrete at low temperatures (−30°C) was examined. The initial and ultimate crack impact times and the ductility indexes were evaluated. This study’s specimens were prepared by adding two different sizes of rubber particles (20 mesh and 50 mesh) in different ratios (0%, 5%, 10%, 15%, and 20%) at both 25°C and −30°C. The concrete specimens were evaluated using a drop hammer weight test method. The results showed that the initial and ultimate crack impact times and ductility indexes of the rubber concrete specimens had decreased at −30°C. Also, the decrease amplitudes were determined to be lower than those of the reference concrete specimens. Consideration was given in this study to the large variations in the impact values, and a two-parameter Weibull distribution method was adopted in order to analyze the obtained experimental data. The results had demonstrated that the impact times of the rubber concrete specimens could be described using the two-parameter Weibull distribution method results.

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

“…Xue et al [27] clearly reveal that the temperature of some mountains in winter where embankment dams are located could be lower than −20 °C and the results from Adam [28] show that the temperature range of asphalt concrete facing of embankment dams could reach −12 °C-45 °C by the means of the temperature monitoring of the asphalt concrete facing of a Dlouble Strane (Loucna nad Desnou, Czech Republic) pumped storage hydroelectric plant. According to the "Test code for hydraulic asphalt concrete" (DL/T 5362-2018) [23] as well as the consideration of the actual temperature range of asphalt core rockfill dams revealed in references mentioned above [27,28], four temperatures are set, including −20 °C, 0 °C, 25 °C and 45 According to "Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering" (JTG E20-2011) [24] and related literature on the dynamic behaviors of asphalt concrete at various temperatures [1,9], the samples in the uniaxial compression tests are usually cylinders and prisms. The test results exhibited in the conference show that the effects of geometry do not affect the stress-strain behaviors of asphalt concrete under uniaxial compression [25].…”

“…Xue et al [27] clearly reveal that the temperature of some mountains in winter where embankment dams are located could be lower than −20 • C and the results from Adam [28] show that the temperature range of asphalt concrete facing of embankment dams could reach −12 • C-45 • C by the means of the temperature monitoring of the asphalt concrete facing of a Dlouble Strane (Loucna nad Desnou, Czech Republic) pumped storage hydroelectric plant. According to the "Test code for hydraulic asphalt concrete" (DL/T 5362-2018) [23] as well as the consideration of the actual temperature range of asphalt core rockfill dams revealed in references mentioned above [27,28], four temperatures are set, including −20 • C, 0 • C, 25 • C and 45 • C. Depending on the method in reference [27], these specimens selected for low-temperature tests are placed in the industrial refrigerators for 48 h at −20 • C and 0 • C, respectively, to ensure that the specimens reach the set temperature and are fully uniform in temperature. At the same time, these specimens for high-temperature tests are placed in the oven for 48 h at 45 • C to ensure that the specimens reach the set temperature and are fully uniform in temperature while the specimens for room temperature tests (25 • C) are placed indoors for 48 h. All specimens used in the paper are then immediately taken out to complete required tests.…”

“…The test temperature range should be set to illustrate the temperature effect on the compressive dynamic behaviors of hydraulic asphalt concrete. Xue et al [ 27 ] clearly reveal that the temperature of some mountains in winter where embankment dams are located could be lower than −20 °C and the results from Adam [ 28 ] show that the temperature range of asphalt concrete facing of embankment dams could reach −12 °C–45 °C by the means of the temperature monitoring of the asphalt concrete facing of a Dlouble Strane (Loucna nad Desnou, Czech Republic) pumped storage hydroelectric plant. According to the “Test code for hydraulic asphalt concrete” (DL/T 5362-2018) [ 23 ] as well as the consideration of the actual temperature range of asphalt core rockfill dams revealed in references mentioned above [ 27 , 28 ], four temperatures are set, including −20 °C, 0 °C, 25 °C and 45 °C.…”

“…According to the “Test code for hydraulic asphalt concrete” (DL/T 5362-2018) [ 23 ] as well as the consideration of the actual temperature range of asphalt core rockfill dams revealed in references mentioned above [ 27 , 28 ], four temperatures are set, including −20 °C, 0 °C, 25 °C and 45 °C. Depending on the method in reference [ 27 ], these specimens selected for low-temperature tests are placed in the industrial refrigerators for 48 h at −20 °C and 0 °C, respectively, to ensure that the specimens reach the set temperature and are fully uniform in temperature. At the same time, these specimens for high-temperature tests are placed in the oven for 48 h at 45 °C to ensure that the specimens reach the set temperature and are fully uniform in temperature while the specimens for room temperature tests (25 °C) are placed indoors for 48 h. All specimens used in the paper are then immediately taken out to complete required tests.…”

Experimental Study and Numerical Analysis on Impact Resistance of Civil Air Defense Engineering Shear Wall

“…At present, there are many studies on the impact test and numerical simulation of ordinary reinforced concrete columns [16][17][18][19][20], beams [21][22][23][24][25][26], and walls (plates) [27][28][29][30][31][32][33]. Civil air defense engineering shear walls play an important role in civil air defense engineering structures and are also the main force components under impact loads.…”