Research On Properties And Applications Of Self-Compacting Backfill

Abutment jump is one of the most frequent quality problems encountered in high way construction. In order to improve the quality of backfill, a new backfill material:self-compacting backfill was introduced. The new material can reuse excavation soil, also with good workability.Firstly, based on a lot of workability experiments, the raw materials of self-compacting backfill is determined. And the water solid ratio is proposed as one of mix-design parameters. After that, the mix design method of self-compacting backfill is proposed.According to the mix design method above, experiments of the basic mechanical properties including compressive strength, CBR and stress-strain characteristic were carried out. It is obtained, that the rule of strength growth with age, and that the strength empirical formula with two parameters: the water solid ratio and the cement soil ratio.The freezing and thawing experiment and wetting-drying experiment were also carried out. The results show that self-compacting backfill has similar degradation rule in two different external damage functions. Its ability to resist the external damage increase with compressive strength rising.Finally, based on the indoor experiments, self-compacting backfill was successfully applied in practical example. The new material made good project effects, environment protection and economic profit. And the construction and quality management methods are proposed based on the construction experience.