Experimental and Theoretical Studies of the Peculiarities of Concrete Behavior in Time and the Concrete Limit Characteristics from the Standpoint of Creep Adsorption Theory

Author(s): Merab Lordkipanidze, Olgha Giorgishvili, Iuri Salukvadze, Nika Botchorishvili,Aleksandre Tatanashvili
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 2
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
ISBN:978-2-35158-200-8
e-ISBN:978-2-35158-198-8
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 627-632
Total Pages: 6
Language : English

Abstract: Based on the experimental and theoretical studies from the standpoint of the adsorption theory of creep, the authors show the peculiarities of the concrete behavior in time and propose a universal graph of the limit characteristics of concrete, including: the limits of strength, elastic deformation, linear creep, endurance.
It is established that the limit strength value R changes in time and depends on the velocity of load application, while the elastic deformation limit is a constant value and does not depend on the age of concrete and the load application velocity.
The maximal limit deformation of concrete of any composition is a constant value under repeated loads as well as under the constant load.
The breaking of concrete in time occurs due to the combined action of external forces, which is expressed in terms of the trapezoid area, and due to an additional effect of the wedging action of water which is equal to the triangle area.
According to the theory on the nature of concrete creep, the cause of the creep in the region of elastic deformation is the influence of water adsorption, which shows itself in its wedging action on the reversible micro cracks of concrete, i.e. the creep in the elastic deformation region is completely reversible, and the wedging action of water can be regarded as an additional stress to the stress due to load.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00