Experimental Study on the Mix Proportion and Mechanical Properties of New Underwater Cementitious Filling Materials
Considering that it is difficult for traditional materials to simultaneously meet the requirements for filling grouting of water-filled karst caves and subsequent shield tunneling, an environmentally friendly and controllable new underwater cementitious filling material (NUC-FM) is developed, with a...
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| Format: | Article |
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MDPI AG
2022-04-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/8/2938 |
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| author | Yuan Mei Dongbo Zhou Rong Wang Miaomiao Zhang Wangyang Xu Yan Zhang Xin Ke |
| author_facet | Yuan Mei Dongbo Zhou Rong Wang Miaomiao Zhang Wangyang Xu Yan Zhang Xin Ke |
| author_sort | Yuan Mei |
| collection | DOAJ |
| description | Considering that it is difficult for traditional materials to simultaneously meet the requirements for filling grouting of water-filled karst caves and subsequent shield tunneling, an environmentally friendly and controllable new underwater cementitious filling material (NUC-FM) is developed, with abandoned shield mud as the basic raw material. Through laboratory tests, the mechanical property parameters of NUC-FM are tested, and its micromechanism is analyzed. The research results show that there is excellent synergistic interactions among shield mud, cement, flocculant, fly ash and other raw materials. The NUC-FM grouting filling material with superior performance can be prepared when the water binder ratio is between 0.45 and 0.6 and the water consumption is between 270 and 310 kg/m<sup>3</sup>. It has the characteristics of non-dispersion underwater and moderate consolidated body strength. The compressive strength of the NUC-FM consolidated body samples under each mix proportion is much higher than 0.5 MPa, which meets the technical strength requirements of a construction site, and the microstructure shows that there is an obvious dense and stable block structure inside. The cost of the NUC-FM prepared with an optimized mix proportion is only 34.57 dollars/m<sup>3</sup>, which is far lower than the market purchase price of concrete and cement mortar. It can be predicted that the NUC-FM is an ideal filling grouting material for water-filled karst caves in shield tunnels in water-rich karst areas. |
| first_indexed | 2024-03-09T04:27:15Z |
| format | Article |
| id | doaj.art-dd90cfe4ca8246f986841578cf69ac55 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T04:27:15Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-dd90cfe4ca8246f986841578cf69ac552023-12-03T13:39:47ZengMDPI AGMaterials1996-19442022-04-01158293810.3390/ma15082938Experimental Study on the Mix Proportion and Mechanical Properties of New Underwater Cementitious Filling MaterialsYuan Mei0Dongbo Zhou1Rong Wang2Miaomiao Zhang3Wangyang Xu4Yan Zhang5Xin Ke6School of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, ChinaConsidering that it is difficult for traditional materials to simultaneously meet the requirements for filling grouting of water-filled karst caves and subsequent shield tunneling, an environmentally friendly and controllable new underwater cementitious filling material (NUC-FM) is developed, with abandoned shield mud as the basic raw material. Through laboratory tests, the mechanical property parameters of NUC-FM are tested, and its micromechanism is analyzed. The research results show that there is excellent synergistic interactions among shield mud, cement, flocculant, fly ash and other raw materials. The NUC-FM grouting filling material with superior performance can be prepared when the water binder ratio is between 0.45 and 0.6 and the water consumption is between 270 and 310 kg/m<sup>3</sup>. It has the characteristics of non-dispersion underwater and moderate consolidated body strength. The compressive strength of the NUC-FM consolidated body samples under each mix proportion is much higher than 0.5 MPa, which meets the technical strength requirements of a construction site, and the microstructure shows that there is an obvious dense and stable block structure inside. The cost of the NUC-FM prepared with an optimized mix proportion is only 34.57 dollars/m<sup>3</sup>, which is far lower than the market purchase price of concrete and cement mortar. It can be predicted that the NUC-FM is an ideal filling grouting material for water-filled karst caves in shield tunnels in water-rich karst areas.https://www.mdpi.com/1996-1944/15/8/2938karstNUC-FMmix proportionmechanical propertiesmicrostructure |
| spellingShingle | Yuan Mei Dongbo Zhou Rong Wang Miaomiao Zhang Wangyang Xu Yan Zhang Xin Ke Experimental Study on the Mix Proportion and Mechanical Properties of New Underwater Cementitious Filling Materials Materials karst NUC-FM mix proportion mechanical properties microstructure |
| title | Experimental Study on the Mix Proportion and Mechanical Properties of New Underwater Cementitious Filling Materials |
| title_full | Experimental Study on the Mix Proportion and Mechanical Properties of New Underwater Cementitious Filling Materials |
| title_fullStr | Experimental Study on the Mix Proportion and Mechanical Properties of New Underwater Cementitious Filling Materials |
| title_full_unstemmed | Experimental Study on the Mix Proportion and Mechanical Properties of New Underwater Cementitious Filling Materials |
| title_short | Experimental Study on the Mix Proportion and Mechanical Properties of New Underwater Cementitious Filling Materials |
| title_sort | experimental study on the mix proportion and mechanical properties of new underwater cementitious filling materials |
| topic | karst NUC-FM mix proportion mechanical properties microstructure |
| url | https://www.mdpi.com/1996-1944/15/8/2938 |
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