Experimental determination of the influence of additives on shrinkage in self-compacting concrete

25th International Conference and Meeting of Departments, CONSTRUMAT 2019

Alexa, M.^1 ; Kucharczyková, B.^1 ; Kocáb, D.^1 ; Dank, P.^1

Brno University of Technology, Faculty of Civil Engineering, Veveí 331/95, Brno, Czech Republic^1

关键词: Experimental determination;    External strains;    Manual measurements;    Mass loss;    Volume change;    Volume change measurement;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/549/1/012009/pdf
DOI  :  10.1088/1757-899X/549/1/012009

来源: IOP

【 摘 要 】

The paper deals with the influence of additives on the progress of shrinkage and mass losses in self-compacting concrete. Limestone and fly ash at varying amounts were used as an additive in the production of four types of self-compacting concrete. Volume changes were observed from an early stage of setting (the measurement was commenced within 1 hour of mixing) using shrinkage drains with a moveable wall, followed by a long-term manual measurement using an external strain gauge. For the first 48 hours the volume-change measurement was continuous, and for the next few months it was performed manually. Mass losses were determined simultaneously with shrinkage - during the first 48 hours by weighing on a special weighing table capable of continuous recording, and manually afterwards.