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Study on the Performance of Paper Fiber Based Modified Permeable Mortars in Tunnelling
(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 2. School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031; 3. State Key Laboratory of Special Functional Waterproof Materials, Beijing Oriental Yuhong Waterproof Technology Co., Ltd., Beijing 101309)
Abstract In order to develop a type of mortar that is suitable for leveling of the tunnel initial support surface and has certain permeability, paper fibers are added to mortar samples to modify the performance. The degradation principle of paper fibers is analyzed, and paper fibers with different dosages are added to mortar samples, with the aim to test and analyze basic performance indicators (e.g. bulk density, water absorption and compressive strength) and microstructure. It can be seen from the test result that paper fibers have degradable property in an alkaline environment; paper fibers can increase the water absorption of ordinary mortar samples by 2～3 times and also contribute to a reduction in the bulk density and compressive strength of mortar samples; and there is a negative correlation between water absorption and compressive strength after linear fitting is performed for the water absorption and compressive strength of mortar samples. The study results show that it is feasible to improve the water permeability of mortars by using paper fibers, but the impact of the addition dosage of paper fibers on other performances of mortars needs to be studied further.
Abstract：
In order to develop a type of mortar that is suitable for leveling of the tunnel initial support surface and has certain permeability, paper fibers are added to mortar samples to modify the performance. The degradation principle of paper fibers is analyzed, and paper fibers with different dosages are added to mortar samples, with the aim to test and analyze basic performance indicators (e.g. bulk density, water absorption and compressive strength) and microstructure. It can be seen from the test result that paper fibers have degradable property in an alkaline environment; paper fibers can increase the water absorption of ordinary mortar samples by 2～3 times and also contribute to a reduction in the bulk density and compressive strength of mortar samples; and there is a negative correlation between water absorption and compressive strength after linear fitting is performed for the water absorption and compressive strength of mortar samples. The study results show that it is feasible to improve the water permeability of mortars by using paper fibers, but the impact of the addition dosage of paper fibers on other performances of mortars needs to be studied further.
JIANG Yajun1 YU Liangmin1 WANG Cuijuan2 WANG Yongchao2 WANG Huqun
.Study on the Performance of Paper Fiber Based Modified Permeable Mortars in Tunnelling[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(2): 141-149
2022, Vol. 59 