Research on the influence of admixtures and supplementary cementitious materials on the performance of bored pile concrete
ZENG Xiaoxing
YU Qijun
WEI Jiangxiong
CHEN Liaoguang
Abstract：The effects of different admixture and supplementary cementitious materials on the rheologic properties,workability,and mechanical properties of bored pile concrete were studied.The results show that the addition of ground granulated blast furnace slag(GGBS)will increase the static yield stress and plastic viscosity of bored pile concrete,while compounding fly ash and GGBS with silica fume can reduce the static yield stress and plastic viscosity of bored pile concrete.The formulation of super retarding admixture and super collapse resistant admixture can be used to prepare bored pile concrete with excellent working performance,the addition of composite mineral admixtures can improve the slump and slump-flow retention performance of bored pile concrete,with the increasing of super retarding admixture dosage,it will reduce the compressive strength of bored pile concrete.With the increase of P80 dosage,the compressive strength of concrete at 28 days remains basically unchanged.The pull-out performance of bored pile concrete with silica fume has a lower pull-out force,the pull-out force is only twice the weight of the steel casing after standing for 4 hours,which is conducive to the extraction of the temporary casing of bored pile concrete.
Keywords：admixturessuper retardingsuper collapse resistantbored pile concreteyield stressworking performance
Publication Date：2025-05-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 61-66 )