Experimental Study on the Mix Proportion and Mechanical Properties of New Underwater Cementitious Filling Materials
- Release time:2024-08-09
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Affiliation of Author(s):
土木工程学院
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Journal:
Materials
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Key Words:
karst; NUC-FM; mix proportion; mechanical properties; microstructure
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Abstract:
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/m3
. 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/m3
, 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.
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First Author:
meiyuan
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Indexed by:
Journal paper
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ISSN No.:
996-1944
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Translation or Not:
no
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Date of Publication:
2022-04-12
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