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Carbonation kinetics in roman-like lime mortar
The kinetic parameterisation of lime mortar carbonation is a useful technique for understanding ancient building methods and the long-lived physical-chemical stability of roman monuments. Portlandite (Ca(OH)2) binders harden in the air on contact with atmospheric CO2, producing CaCO3. Water evaporation and the presenc…
Creep and Cyclic Mechanical Properties of Composites Based on Shape Memory Polymer
Article Creep and Cyclic Mechanical Properties of Composites Based on Shape Memory Polymer was published on September 1, 2004 in the journal Science and Engineering of Composite Materials (volume 11, issue 2-3).
Alternative castor oil-based polyurethane adhesive used in the production of plywood
Plywood is normally produced with urea-formaldehyde and/or phenol-formaldehyde adhesives. However, the former is considerably toxic and environmentally damaging, while the latter is expensive, thus motivating the search for alternative raw materials in plywood production. The castor oil-based polyurethane adhesive dev…
Potentialities of some surface characterization techniques for the development of titanium biomedical alloys
Bone formation around a metallic implant is a complex process that involves micro- and nanometric interactions. Several surface treatments, including coatings were developed in order to obtain faster osseointegration. To understand the role of these surface treatments on bone formation it is necessary to choose adequa…
Analysis of the cutting fluid influence on the deep grinding process with a CBN grinding wheel
The application of cutting fluid in a deep grinding process is becoming more and more important, mainly where the cutting fluids are used as an "external" agent to the grinding conditions. The role of the fluid in grinding operations is in refrigeration of the workpiece, removal of the shavings, lubrication of the gri…
Inspection of Thick Composites for Near Surface Flaws
Modification of plasma polymer films by ion implantation
In this work, thin polymer films were prepared from acetylene and argon radiofrequency (13.56 MHz, 80 W) glow discharges. Post-deposition treatment was performed by plasma immersion ion implantation in nitrogen or helium glow discharges (13.56 MHz, 70 W). In these cases, samples were biased with 25 kV negative pulses.…
Materials Research - Revista Ibero-americana de Materiais: Criteriosa, justa e educativa!
Evaluation of Particle Size and Particle Shape Distributions in Al-Al3Ni FGMs Fabricated by a Centrifugal in-situ Method
Preparation and characterization of FeAg granular alloys
Fe10Ag90 granular alloys have been fabricated, using a sol-gel method, for a range of nitric acid concentrations in the start solution. The samples have been characterized by X-ray diffraction and magnetization measurements. The average Fe particle sizes derived from X-ray diffraction are in the range 24-29 nm, indica…
Synthesis and preliminary characterization of octakis (chloropropyldimethylsiloxy) octasilsesquioxane
Octakis (hydridodimethylsiloxy) octasilsesquioxane was hydrosilated with allyl chloride using Spiers catalyst (H2PtCl6). This reaction was monitored using FT-IR spectroscopy. The synthesized product was characterized by 13C, 29Si NMR (MAS), SEM, FT-IR, Thermogravimetric techniques. The three propyl groups alpha, beta,…
Los Angeles Test and Polished Stone Value of ophite in Cantabria: a petrophysical interpretation
Crushed aggregate obtained from certain ophite outcrops in Cantabria was tested with the Los Angeles and polished stone value (PSV) procedures. Linear regression analysis was used to identify the pétrographie parameters that account for aggregate performance in these two tests. The most abundant and common minerals in…
Modeling of Laminated Composite Structures with Piezoelectric Actuators
Shear Buckling Analysis of Angle-Ply Laminates with Higher- Order Shear Deformation and pb-2 Ritz Functions
Fragmentation Analysis of Single-Fiber Carbon Composites
Development of Compression Bending Test Method for Advanced Composites - A Review
Damage Monitoring of Al2O3/Epoxy Laminates with Luminance Change of Transmitted Light from EL Device
Development of TTMSP to Predict the Performance of Discontinuous Natural Fibre-Polymer Composites
''Geopolymers": same basic chemistry, different microstructures
The present paper describes the effect of certain working variables on the microstructural evolution of oven-dried, alkali-activated fly ash. The results show that the main reaction product in the activation process (in all the systems studied) is an amorphous aluminosilicate gel with a three-dimensional structure. No…