Published in Granular Matter
The segregation of particles in a granular material is a well known effect of high importance in many industries. Concentrated suspensions like concrete are strongly influenced by the behavior of the coarse aggregates. In these suspensions, the segregation also occurs, especially during the transport of the material through pipes. Typically, concre...
Published in Burns & Trauma
BackgroundPavement-street contact burns are rare. This study compared recent contact burns to those published in “Pavement temperature and burns: Streets of Fire” in 1995. The hypothesis was that there were a significantly increased number of pavement-street burns, as a result of increased ambient temperatures, and that motor vehicle crash (MVC) co...
The shielded enclosure design around the gamma radiography facilities under 100 Ci cobalt-60 source was evaluated as well as the maze design and source positions contribution to the dose limitation consistent with the ALARA principle. It was found that the most effective maze type to shield gamma radiations was double (multiple by extension) corner...
The prediction of structural vibrations in vibration sensitive laboratory structures is a complex problem involving computationally heavy 3D models with long computational times. However, in the early design phases of a project long computational times are undesirable. Therefore the problem statement of this Master thesis concerns the development o...
Compressive membrane action is a phenomenon commonly found in reinforced concrete structures after significant cracking and deformation have taken place. In this thesis report, the potential benefit of CMA in immersed tubes subjected to fires is quantified through a finite element study. Furthermore, sensitivity studies are conducted in order to de...
Published in Journal of the Mechanical Behavior of Materials
Concrete behaves as a brittle material due to its low inherent tensile strength, but it can also exhibit a markedly ductile behavior when coupled with transverse reinforcement like steel stirrups. The role of stirrups is to enhance confinement effect, to restrain the lateral expansion of concrete, thus modifying the concrete stress-strain constitut...
Published in SN Applied Sciences
This study aimed to use fuzzy logic model to predict various mechanical properties such as compressive strength, flexural strength and post-peak deformation of steel-fiber reinforced concrete. For this purpose, five different dosages of steel fibers (10 kg/m3, 12.5 kg/m3, 15 kg/m3, 17.5 kg/m3 and 20 kg/m3) were used in the mix design. A total of 3 ...
Published in Journal of Bio- and Tribo-Corrosion
Corrosion rates and resistivity of concrete at different corrosive conditions (exposed to air, partially and totally immersed in water), using various types of steel surface conditions (phosphatized, as-received, and cleaned steels), were evaluated using an electrochemical polarization technique in the presence of different concentrations of sugarc...
This is an environmental study on concrete that follows the standard protocol of life cycle assessment (LCA) for two types of concrete, ordinary and frost-resistant concrete, with a focus on the superplasticizers used as admixtures. The use phase is not included in this study and the concrete is assumed to be inert during this phase. The results sh...
Published in Journal of Nondestructive Evaluation
Alkali–silica reaction (ASR) is a ubiquitous cause of concrete degradation. The reaction produces an expandable gel that may cause internal over-stressing and cracking. This paper demonstrates the utility of single-impact nonlinear resonant acoustic spectroscopy (SINRAS) for monitoring the progress of ASR over the course of a standard ASR-susceptib...
