Materials Reports  2021, Vol. 35 Issue (z2): 275-278 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Experimental Study on Preparation of High Performance Grouting Material from Waste Sand of Shield Tunnel Construction |
| LI Shujin1, LIU Yuantao2, LI Jianfen1, SHENG Yanmin1
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1 School of Civil Engineering and Architecture, Changzhou Institute of Technology, Changzhou 213032, China
2 Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China |
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Abstract In this study, a high-performance environmentally friendly grouting materials was prepared by using waste sand generated during shield tunnel construction. The effects of water-solid ratio, sand-gel ratio and water-reducing agent dosage on grouting material consistency, fluidity, setting time, stone rate, drainage rate and compressive strength were studied. The results show that the initial consistency, setting time and fluidity of the grouting materials increase with the increase of the water-solid ratio, while the stone rate and compressive strength decrease. With the increase of the cement-sand ratio, the initial consistency and fluidity decrease, while the setting time increases. By adding water-reducing agent, the working performance of grouting material is significantly improved. In this test, the optimal mix ratio is: water-solid ratio 0.45, sanding ratio 3∶1, and water-reducing agent content 2‰. The technical indexes of corresponding grouting materials are fluidity of 164 mm, initial consistency of 118 mm, setting time of 1 035 min, stone rate of 95.7%, bleeding rate of 2.4% and 3 d compressive strength of 12.0 MPa.
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Published: 09 December 2021
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| Fund:This work was financially supported by the “333 Engineering” Program of Jiangsu Province (BRA2019159) and the National Natural Science Foundation of China (51678083). |
| About author:: Shujin Li, professor, doctor, master supervisor, Chang-zhou Institute of Technology, School of Civil Enginee-ring and Architecture. The main research fields are high performance concrete materials, resource utilization of industrial waste residue, etc. |
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