Plastometry for the Self-Compacting Concrete Mixes

2nd International Conference on Innovative Materials, Structures and Technologies

Lapsa, V.A.^1 ; Krasnikovs, A.^1 ; Lusis, V.^1 ; Lukasenoks, A.^2

Riga Technical University, Institute of Building Production, Faculty of Civil Engineering, RTU Concrete Mechanics Laboratory, Kalku Str. 1, Riga

LV-1658, Latvia^1

Institute of Mechanics, RTU Concrete Mechanics Laboratory, Riga Technical University, Ezermalas Str. 6, Riga

LV-1006, Latvia^2

关键词: Buoyancy forces;    Flow charac-teristics;    Mechanics laboratory;    Physical characteristics;    Rheological test;    Self-compacting;    Stress and strain;    Technological process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/96/1/012045/pdf
DOI  :  10.1088/1757-899X/96/1/012045

来源: IOP

【 摘 要 】

Operative determination of consistence of self-compacting concrete mixes at plant or in construction conditions is an important problem in building practice. The Abram's cone, the Vebe's device, the U-box siphon, L-box or funnel tests are used in solving this problem. However, these field methods are targeted at determination of some indirect parameters of such very complicated paste-like material like concrete mix. They are not physical characteristics suitable for the rheological calculations of the coherence between the stress and strains, flow characteristics and the reaction of the concrete mix in different technological processes. A conical plastometer having higher precision and less sensitive to the inaccuracy of the tests in construction condition has been elaborated at the Concrete Mechanics Laboratory of RTU. In addition, a new method was elaborated for the calculation of plasticity limit τ0taking into account the buoyancy force of the liquid or non-liquid concrete mix. In the present investigation rheological test of the concrete mix by use the plastometer and the method mentioned earlier was conducted for different self-compacting and not self-compacting concrete mixes.