A tack coat is a thin cut-back cement or asphalt emulsion coating applied on an existing non-absorbent pavement. good bonding between the and concrete necessary to provide sufficient structural strength. Poor adhesion will result in shear failure. The test one of basic tests determine bond This study aims quantify best resistance obtained using three types asphalts (RC70, RC800 modified with po...

objectives: this study aimed to compare the durability of four adhesive systems by assessing their microtensile bond strength (mtbs) and microleakage during six months of water storage. materials and methods: a total of 128 human third molars were used. the adhesives tested were scotch bond multipurpose (sbmp), single bond (sb), clearfil-se bond (cseb), and all-bond se (abse). after sample prep...

To understand the oxidation behaviors of NiCrAlY bond coats in thermal barrier coatings (TBCs) under external loads, uniaxial tensile and compressive experiments TBCs air at 900 °C for 100 h were investigated. Then, experimental results explained by first-principles simulation. The showed that rate coat was accelerated stresses. A 0.9 μm thickness, a thermally grown oxide (TGO) layer found with...

TBCs (Thermal Barrier Coatings) are multilayer structures usually consisting of a ceramic layer, known as top coat, arranged on connecting bond which, in turn, is above the substrate to protect. These applied hot section parts gas turbine engines for providing thermal protection. During component life, some oxidation end/or wear phenomena can occur, therefore TBC generally removed and then reap...

PURPOSE To evaluate the microshear bond strength (μSBS) of several universal adhesive systems applied on five different indirect restorative materials. MATERIALS AND METHODS Five CAD/CAM materials were selected: 1) indirect resin composite (LAV); 2) feldspathic glass ceramic (VTR); 3) leucite-reinforced glass-ceramic (EMP); 4) lithium disilicate ceramic (EMX); 5) yttrium-stabilized zirconium ...

objective: the aim of this study was to evaluate the microtensile bond strength to sound and caries-affected dentin using single bond and adper prompt-l-pop adhesives. materials and methods: sixteen extracted human molars with carious lesions extended halfway through dentin were ground to expose the caries affected and the surrounding normal dentin. the samples were divided into two groups of e...

Self-consistent generalized valence bond (GVB) and configuration-interaction calculations have been performed for a cluster model of the neutral vacancy in silicon. Three low-lying states ('E, 'T„sA2) are found to possess one electron in dangling-bond orbitals on each of the four silicon atoms around the defect. Of these three covalent states, the 'E is found to be the ground state with the exc...