Abstract
The backfill material for the underground pipe wall of Yellow River embankment was developed to avoid the high settlement and environmental damage caused by high filling and excavation. The interrelation between microstructure and compressive strength of the self-compacting foam backfill material with different water–binder ratios and density grades was investigated. The results indicated that the average pores size of the foam backfill material increased with increasing the water–binder ratio. Moreover, the compressive strength of the foam backfill material first increased and then decreased with continuously increasing the water–binder ratio. Based on the observation and the analysis of the computed tomography (CT) image, it can be found that the pore size of the foam backfill material decreased with the increment of the density grade. The overall findings demonstrated that the pore size and volume played an important role in affecting the performance of the foam backfill material used for the construction of the underground pipe wall of Yellow River embankment.
Highlights
The Yellow River is an important waterway connecting the inland to the coast of China
A novel self-compacting foam backfill material is developed to avoid high settlement and environmental damages caused by high filling and excavation on the back wall of the Yellow River pipeline
The average pore size of the foam backfill material with different density is increased with the increase of the water–cement ratio
Summary
The Yellow River is an important waterway connecting the inland to the coast of China. The internal force and displacement of the structure are significantly reduced, effectively improving the shear bearing capacity and deformation characteristics of the structure [11,12] These properties make the lightweight foam materials suitable for applications in filling the back-wall of the Yellow River pipeline to avoid high settlement and environmental damages caused by high filling and digging, which is of great significance for protecting the dike safety and natural ecological environment [13,14,15]. The influencing mechanisms of macro-factors in the microstructure were dissected to provide a basic theory for the backfill application of the developed self-compacting foamed lightweight material in the underground pipeline wall of the Yellow River embankment
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