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Experimental Analysis on Shrinkage and Swelling in Ordinary Concrete
(Hindawi Publishing Corporation, 2017-05-22)
The paper deals with the experimental determination of shrinkage development during concrete ageing. Three concrete mixtures were made. They differed in the amount of cement in the fresh mixture, 300, 350, and 400kg/m3. ...
Life Cycle Assessment Optimization of a Shotcrete Tunnel Lining
(IOP Publishing, 2018-11-27)
The proposed contribution describes the formulation of the optimization design of a utility tunnel lining. The objective function is defined as a multicriterial problem and includes economic and environmental aspects ...
Pilot evaluation of a fracture process zone in a modified compact tension specimen by X-ray tomography
(Italian Group of Fracture, 2017-10-03)
In the case of quasi-brittle material, there is a zone of non-linear behaving material, near the crack tip. A major part of this zone forms a so-called fracture process zone (FPZ), where mechanisms of material toughening ...
Cast Screws as Shear Anchors for Composite Slabs
(Elsevier, 2017-07-20)
Composite slabs consist of trapezoidal steel sheeting and concrete cover. The steel sheeting serves as both, a lost framework and a tension bearing member after hardening of concrete. The longitudinal shear between the ...
Testing an Impedance Non-destructive Method to Evaluate Steel-Fiber Concrete Samples
(Institute of Measurement Science of Slovak Academy of Sciences, 2018-03-01)
The paper discusses tests related to the evaluation of the density and orientation of fibers in a composite material. Compared to the approaches used to date, the proposed technique is based on the evaluation of the ...
Methodology for the quantification of concrete sustainability
(EDP Sciences, 2018-06-26)
LCA is a method that evaluates the life cycle of a structure from the point of view of its impact on the environment. Consideration is given also to energy and raw material costs, as well as to environmental impact throughout ...
Behaviour of cement composites with lightweight and heavyweight aggregates at high temperatures
(Budapest University of Technology and Economics, 2017-03-24)
This paper presents new results of the research of the influence
of individual input components done on the behaviour of cement
based composite materials exposed to high temperatures. A
new approach of this research lies ...
Study of a different carbonation intensity on the internal surface of cracks and inside concretes with dense aggregate and concrete recyclate
(IOP Publishing, 2018-07-16)
The paper focuses on the experimental physical-chemical analysis of different carbonation intensity by TG/DTG and FTIR method on the selected surfaces of concretes with aggregate and with concrete recyclate, with and without ...
Determining reinforcement coverage using an electromagnetic rebar detector
(IOP Publishing, 2018-07-16)
Correct reinforcement is an essential part of constructing reinforced concrete structures. Errors in positioning, diameter, or coverage may result in defects, which is why it is necessary to make sure the reinforcement is ...
The bond strength by pull-off and direct tensile strength of concrete damaged by elevated temperatures
(IOP Publishing, 2018-07-16)
This paper presents the results of an experimental study of selected characteristics of
concrete following its exposure to high temperatures. The monitored parameter was the
influence of high temperatures on the bond ...