Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Investigation of microstructural damage in shotcrete under a freeze–thaw environment
Highlights The changing rule of axial compressive strength was disclosed. The distribution of micro-pores was investigated by CT during freeze–thaw cycles. The rule of micro-pores distribution was revealed during freeze–thaw cycles.
Abstract Shotcrete is extensively used in underground engineering and other fields. In cold regions, the initial shotcrete lining of tunnels is repeatedly frozen and melted several times in a single year when temperatures alternately change. Thus, the freeze-proof durability of shotcrete is significantly impacted by the freeze–thaw cycle. Computed tomography (CT), a non-destructive scanning method, was adopted to demonstrate the process of shotcrete microstructural damage in a freeze–thaw environment. CT scanning results showed that looseness and slippage of the cement mortar became increasingly apparent and that the number of internal micro-pores significantly decreased with increasing number of freeze–thaw cycles. In addition, the axial compressive strengths of the shotcrete prism specimens significantly decreased. After 300 freeze–thaw cycles, the total number of micro-pores in specimens DR1-1 and DR1-2 decreased by 50.32% and 34.20%, respectively, and the axial compressive strength loss reached 63.78%.
Investigation of microstructural damage in shotcrete under a freeze–thaw environment
Highlights The changing rule of axial compressive strength was disclosed. The distribution of micro-pores was investigated by CT during freeze–thaw cycles. The rule of micro-pores distribution was revealed during freeze–thaw cycles.
Abstract Shotcrete is extensively used in underground engineering and other fields. In cold regions, the initial shotcrete lining of tunnels is repeatedly frozen and melted several times in a single year when temperatures alternately change. Thus, the freeze-proof durability of shotcrete is significantly impacted by the freeze–thaw cycle. Computed tomography (CT), a non-destructive scanning method, was adopted to demonstrate the process of shotcrete microstructural damage in a freeze–thaw environment. CT scanning results showed that looseness and slippage of the cement mortar became increasingly apparent and that the number of internal micro-pores significantly decreased with increasing number of freeze–thaw cycles. In addition, the axial compressive strengths of the shotcrete prism specimens significantly decreased. After 300 freeze–thaw cycles, the total number of micro-pores in specimens DR1-1 and DR1-2 decreased by 50.32% and 34.20%, respectively, and the axial compressive strength loss reached 63.78%.
Investigation of microstructural damage in shotcrete under a freeze–thaw environment
Chen, Jianxun (Autor:in) / Deng, Xianghui (Autor:in) / Luo, Yanbin (Autor:in) / He, Lianchao (Autor:in) / Liu, Qin (Autor:in) / Qiao, Xiong (Autor:in)
Construction and Building Materials ; 83 ; 275-282
18.02.2015
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Investigation of microstructural damage in shotcrete under a freeze–thaw environment
| Online Contents | 2015
Investigation of microstructural damage in shotcrete under a freeze–thaw environment
| British Library Online Contents | 2015