Setting, rheology and packing density of biomass fly ash/Portland cement mixtures

International Conference Building Materials, Products and Technologies

土木建筑工程

Bohá, M.^1 ; Kubátová, D.^1 ; Neas, R.^1 ; Stank, T.^1

Research Institute for Building Materials, Hnvkovského 30/65, Brno

617 00, Czech Republic^1

关键词: Ash yield;    Cement mixtures;    Packing density;    Plastic viscosity;    Replacement level;    Rheological property;    Water demand;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/379/1/012007/pdf
DOI  :  10.1088/1757-899X/379/1/012007

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Paper deals with rheological properties and packing density of fresh mixtures of Portland cement and biomass fly ash. Water demand of paste of normal consistency increases with increase of replacement level of biomass fly ash for Portland cement. Up to 5 wt. % contents of biomass fly ash yield stress and plastic viscosity values decrease, while at contents higher than 5 wt. %, the opposite trend was revealed. Biomass fly ash compared to Portland cement has proportionally lower content of particles with size of tens and first single digit numbers of microns. Deficiency in this region at higher contents of biomass fly ash in cement mixtures results in deflection from ideal packing density curve.