Open AccessInvestigation on cement-improved phyllite based on the vertical vibration compaction method
Author(s) -
Yingjun Jiang,
Jiangtao Fan,
Yong Yi,
Tian Tian,
Kejia Yuan
Publication year - 2021
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0247599
Subject(s) - phyllite , compaction , subgrade , cement , materials science , weathering , modulus , compressive strength , composite material , geotechnical engineering , geology , geochemistry , schist , metamorphic rock
The vertical vibration compaction method (VVCM), heavy compaction method and static pressure method were used to form phyllite specimens with different degrees of weathering. The influence of cement content, compactness, and compaction method on the mechanical properties of phyllite was studied. The mechanical properties of phyllite was evaluated in terms of unconfined compressive strength ( R c ) and modulus of resilience ( E c ). Further, test roads were paved along an expressway in China to demonstrate the feasibility of the highly weathered phyllite improvement technology. Results show that unweathered phyllite can be used as subgrade filler. In spite of increasing compactness, phyllite with a higher degree of weathering cannot meet the requirements for subgrade filler. With increasing cement content, R c and E c of the improved phyllite increases linearly. R c and E c increase by at least 15% and 17%, respectively, for every 1% increase in cement content and by at least 10% and 6%, respectively, for every 1% increase in compactness. The higher the degree of weathering of phyllite, the greater the degree of improvement of its mechanical properties.