Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The mechanical properties and resistance against the coupled deterioration of sulfate attack and freeze-thaw cycles of tailing recycled aggregate concrete
Highlight: The mechanical properties of RAC containing IOTs were analysed. DIC system was used to evaluate the transverse strain and axial strain. CT was employed to investigate the three-dimensional pore distribution. The resistance to freeze-thaw cycles in water and 5% Na2SO4 solution was investigated.
Abstract The objective of this study is to prepare recycled aggregate concrete (RAC) using iron ore tailings (IOTs) and test their properties. Three different types of concrete were prepared in this study: natural aggregate concrete (NAC), RAC, and tailing recycled aggregate concrete (TRAC). During testing, a digital image correlation (DIC) system was used to evaluate the transverse strain and axial strain of the concrete samples. The cubic compressive strength and uniaxial compressive stress-strain relationship were analysed, and the three-dimensional pore distribution was investigated based on computed tomography (CT) images. Moreover, the resistance of the three different concrete types to freeze-thaw (F-T) cycles in water and 5% Na2SO4 solution was investigated. Through rapid F-T cycle experiments, the surface damage, weight loss rate, residual compressive strength, and relative dynamic elastic modulus (RDEM) were analysed. The test results revealed that the incorporation of IOTs markedly enhanced the mechanical properties and improved the pore structure of RAC. Furthermore, there was an insubstantial variability of the failure modes between TRAC and control group (NAC and RAC). However, increasing the IOT content resulted in a steeper descending branch of the stress-strain curves, indicating an increase in the brittleness of the concrete. The F-T degradation degree of the concrete in the 5% Na2SO4 environment was greater than that in water. The IOT content should not exceed 20% in consideration of the coupled action of F-T cycles and sulfate attack.
The mechanical properties and resistance against the coupled deterioration of sulfate attack and freeze-thaw cycles of tailing recycled aggregate concrete
Highlight: The mechanical properties of RAC containing IOTs were analysed. DIC system was used to evaluate the transverse strain and axial strain. CT was employed to investigate the three-dimensional pore distribution. The resistance to freeze-thaw cycles in water and 5% Na2SO4 solution was investigated.
Abstract The objective of this study is to prepare recycled aggregate concrete (RAC) using iron ore tailings (IOTs) and test their properties. Three different types of concrete were prepared in this study: natural aggregate concrete (NAC), RAC, and tailing recycled aggregate concrete (TRAC). During testing, a digital image correlation (DIC) system was used to evaluate the transverse strain and axial strain of the concrete samples. The cubic compressive strength and uniaxial compressive stress-strain relationship were analysed, and the three-dimensional pore distribution was investigated based on computed tomography (CT) images. Moreover, the resistance of the three different concrete types to freeze-thaw (F-T) cycles in water and 5% Na2SO4 solution was investigated. Through rapid F-T cycle experiments, the surface damage, weight loss rate, residual compressive strength, and relative dynamic elastic modulus (RDEM) were analysed. The test results revealed that the incorporation of IOTs markedly enhanced the mechanical properties and improved the pore structure of RAC. Furthermore, there was an insubstantial variability of the failure modes between TRAC and control group (NAC and RAC). However, increasing the IOT content resulted in a steeper descending branch of the stress-strain curves, indicating an increase in the brittleness of the concrete. The F-T degradation degree of the concrete in the 5% Na2SO4 environment was greater than that in water. The IOT content should not exceed 20% in consideration of the coupled action of F-T cycles and sulfate attack.
The mechanical properties and resistance against the coupled deterioration of sulfate attack and freeze-thaw cycles of tailing recycled aggregate concrete
Xu, Fan (Autor:in) / Wang, Sheliang (Autor:in) / Li, Tao (Autor:in) / Liu, Bo (Autor:in) / Zhao, Nan (Autor:in) / Liu, Kangning (Autor:in)
06.10.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2018