Results 11 to 20 of about 34,422 (242)

Fibras de polipropileno e sua influência no comportamento de concretos expostos a altas temperaturas: revisão Polypropylene fibers and their influence on the behavior of concretes exposed to high temperatures: review

open access: yesCerâmica, 2011
A resistência ao fogo de um elemento estrutural de concreto é avaliada pelo intervalo de tempo em que o elemento continua a desempenhar suas funções sob condições de alta temperatura.
A. L. de Castro   +2 more
doaj   +1 more source

The effect of polypropylene fibres within concrete with regard to fire performance in structures [PDF]

open access: yes, 2008
Purpose – The purpose of this paper is to examine the effect of various polypropylene fibre additions (types and volume) to concrete with regard to explosive spalling when subject to high temperatures similar to those experienced in building or tunnel ...
Alan Richardson   +2 more
core   +1 more source

Planetary rock-breaking bodies and horizontal drilling

open access: yesИзвестия высших учебных заведений: Геология и разведка, 2023
Background. The article considers one of the variants of the original planetary drilling organ, in which used multiple impacts on the mass to be destroyed.
V. L. Skripka, L. H. Minyazeva
doaj   +1 more source

Structural Performance of Short Square Self Compacting Concrete Columns in Fire [PDF]

open access: yesEngineering and Technology Journal, 2015
This paper represents an experimental program on the behavior of SCC columns under fire. The research includes testing reinforced SCC columns subjected to various loading levels and heating rates.
Mohammed Mansour Kadhum Alkafaji
doaj   +1 more source

Stress Analysis and Spalling Failure Simulation on Surrounding Rock of Deep Arch Tunnel

open access: yesApplied Sciences, 2023
To study the stress distribution characteristics of surrounding rock and the spalling mechanism of deep hard rock tunnels with different arch heights, the complex variable function and angle-preserving transformation method in elasticity theory were ...
Kang Peng   +3 more
doaj   +1 more source

Numerical simulation of cyclic oxidation kinetics with automatic fitting of experimental data [PDF]

open access: yes, 2007
This paper proposes a model, based on a Monte Carlo method, to assess cyclic oxidation tests. The numerical code fits automatically the experimental net mass change curves.
Monceau, Daniel   +2 more
core   +2 more sources

Evaluation of DLC-Si Film Damage due to Friction under ATF Lubricated Condition

open access: yesTribology Online, 2008
Diamond-like carbon (DLC) coating technology has been receiving increasing attention in recent years for its application to automotive sliding parts. As it is critical to evaluate the adhesion strength between a film and a substrate for assessment of the
Junji Ando   +2 more
doaj   +1 more source

Effect of Cycle Frequency on High Temperature Oxidation Behavior of Alumina-forming Coatings Used for Industrial Gas Turbine Blades [PDF]

open access: yes, 2004
Oxidation kinetics of platinum modified aluminide and overlay coatings on nickel base superalloys were investigated. Isothermal oxidation tests were carried out at 1050°C in synthetic air. Cyclic oxidation tests were performed with 2 cycle frequencies :
Monceau, Daniel   +2 more
core   +2 more sources

Fire Spalling Prevention via Polypropylene Fibres: A Meso-and Macroscale Approach [PDF]

open access: yes, 2016
A deep understanding of concrete at the mesoscale level is essential for a better comprehension of several concrete phenomena, such as creep, damage, and spalling.
Mazzucco, Gianluca, Xotta, Giovanna
core   +3 more sources

Two-Step Approach Using Degradable Magnesium to Inhibit Surface Biofilm and Subsequently Kill Planktonic Bacteria

open access: yesBiomedicines, 2021
Bacterial infection remains a great risk in medical implantation surgery. In this paper, we found that degradable metals may be a feasible alternative option of antibacterial implantation materials.
Pei-Chun Wong   +7 more
doaj   +1 more source

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