Stability of parameters of the "stress-strain" diagram of concrete with frame structure

In early research [1] it was shown that concrete with frame structure with a volume concentration of coarse aggregate made using crushed granite 0,56 to 0,64 (E-modulus ECA=71 GPa) and crushed siliceous sandstone (ECA=42 GPa) is characterized by the stress-strain diagram, which is significantly diff...

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Bibliographic Details
Main Authors: Mailyan, Dmitry, Nesvetaev, Grigory, Lesniak, Evgeniy, Gortsevskoy, Arkady
Format: Conference Proceeding
Language:English
Subjects:
Axial compression
Axial stress
Concrete aggregates
Crack initiation
Crushing
Fracture mechanics
Frame structures
Heterogeneity
Microcracks
Modulus of elasticity
Parameters
Sandstone
Stiffness
Stress-strain curves
Stress-strain relationships
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Summary:In early research [1] it was shown that concrete with frame structure with a volume concentration of coarse aggregate made using crushed granite 0,56 to 0,64 (E-modulus ECA=71 GPa) and crushed siliceous sandstone (ECA=42 GPa) is characterized by the stress-strain diagram, which is significantly different from the deformation diagram of equal strength vibration compaction concrete. Concrete frame diagram on a coarse aggregate with modulus of elasticity 42000 N/mm2 is almost linear over the entire load range. Diagram of concrete on aggregate with modulus of elasticity 71000 N/mm2 has three parts – the initial part, at which the “stress-strain” relationship is almost linear, further, it is noted that the rigidity of concrete is increased i.e. the "stress-strain" diagram becomes steep to a loading level of 0,6, after which a decrease in stiffness is recorded. It is shown that the change in the concentration of coarse aggregate for technological reasons (heterogeneity of the composition) in the range of 0,56 – 0,64 is accompanied by a change in the initial modulus of elasticity of concrete within 5%. Frame structure concretes are characterized by a higher microcracking level which has a significant effect on the performance of compressed [4 - 8] and bending elements under loading [2, 9, 10]. This paper presents the results of experimental studies of the influence of the stability of strength indica-tors and parameters of the "stress-strain" diagram of concretes with frame structure under short-term central axial compression.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0129667