Les matériaux quasicristallins (QC) présentent des propriétés mécaniques intéressantes, telles une dureté et un module d’Young élevés, ce qui en fait de bons candidats en tant que renforts pour les matériaux composites à matrices métalliques. Ce travail a pour but l’élaboration et l’étude des microstructures et propriétés mécaniques de matériaux composites à base Al renforcés par des particules QC. Des composites à matrice Al3Mg2, Al, Al-Cu-Mg et Al-Mg-Si renforcés par 50% vol. de particules QC Al-Cu-Fe ont été élaborés par infiltration sous pression de gaz. Les composites obtenus sont complexes et présentent de nombreuses phases résultant de la diffusion de l’aluminium et du cuivre. Ces composites sont caractérisés par des contraintes d’écoulement élevées et une fissuration précoce, quelle que soit la température de déformation. Deux composites à matrice aluminium renforcés par des particules QC ont été élaborés par compression isostatique à chaud (HIP). En fonction de la température d’élaboration, nous avons obtenu des matériaux biphasés, l’un renforcé par des particules tétragonales w-Al-Cu-Fe et l’autre par des particules i-Al-Cu-Fe. Ces matériaux présentent des propriétés mécaniques améliorées par rapport à la matrice seule. La forte dépendance de s0.2% en température observée dans le composite Al/w suggère que la déformation plastique est contrôlée par des mécanismes thermiquement activés. En revanche, pour le composite Al/i, la contribution des contraintes internes au durcissement du composite est à prendre en compte en plus des mécanismes thermiquement activés.

Preface Adhesion is a phenomenon architects and civil engineers are not very familiar with. In other disciplines knowledge about surface properties and the background of bonding energies is also far from satisfactory; nevertheless there are many important· applications in concrete engineering, where adhesion is necessary for success and durability. These include: - coating and painting - repair of concrete surfaces - bonding of fresh to old concrete - crack injection - glueing of precast elements - glueing of steel to concrete, etc. In 1981 RILEM established the technical committee 52-RAC 'Resin Adherence to Concrete'. The main aims of the committee's work were - to collect research results and practical experiences - to initiate and coordinate research programs - to develop, on a scientific base, test methods for field and for laboratory purposes. One of the results of the committee's work is a state-of-the-art report, which will be presented orally as a General Report at the International Symposium ISAP '86, and will be printed either in the RILEM journal Materials and Structures or separately. Several test recommendations have been elaborated and will be prepared as drafts for the participants ofISAP '86. These are: - direct tensile test - pull-off test - direct shear test - slant shear test - four-point bending test - dynamic loading test - thermal compatibility test (two versions) - injectibility test.

On October 14-19, 1990, the 6th International Conference on the Conservation of Earthen Architecture was held in Las Cruces, New Mexico. Sponsored by the GCI, the Museum of New Mexico State Monuments, ICCROM, CRATerre-EAG, and the National Park Service, under the aegis of US/ICOMOS, the event was organized to promote the exchange of ideas, techniques, and research findings on the conservation of earthen architecture. Presentations at the conference covered a diversity of subjects, including the historic traditions of earthen architecture, conservation and restoration, site preservation, studies in consolidation and seismic mitigation, and examinations of moisture problems, clay chemistry, and microstructures. In discussions that focused on the future, the application of modern technologies and materials to site conservation was urged, as was using scientific knowledge of existing structures in the creation of new, low-cost, earthen architecture housing.

Engineering Properties of Soils and Rocks, Third Edition serves as a guide to the engineering properties and behavior of soils and rocks. The text also complements other texts on rock and soil mechanics. The book covers topics such as the properties and classification of soils such as tills and other kinds of soils related to cold climates, tropical soils, and organic soils such as peat. The text also includes the engineering behavior and properties, classification and description, discontinuities, and weathering of rocks and rock masses. The monograph is recommended for engineers who would like to know about the properties of soils and rocks and the application of their study in the field of engineering.

This handbook is a reference guide for selecting and carrying out numerous methods of soil analysis. It is written in accordance with analytical standards and quality control approaches. It covers a large body of technical information including protocols, tables, formulae, spectrum models, chromatograms and additional analytical diagrams. The approaches are diverse, from the simplest tests to the most sophisticated determination methods.

Special topic volume with invited peer reviewed papers only

Encapsulations, a volume in the Nanotechnology in the Agri-Food Industry series,presents key elements in establishing food quality through the improvement of food flavor and aroma. The major benefits of nanoencapsulation for food ingredients include improvement in bioavailability of flavor and aroma ingredients, improvement in solubility of poor water-soluble ingredients, higher ingredient retention during production process, higher activity levels of encapsulated ingredients, improved shelf life, and controlled release of flavor and aroma. This volume discusses main nanoencapsulation processes such as spray drying, melt injection, extrusion, coacervation, and emulsification. The materials used in nanoencapsulation include lipids, proteins, carbohydrates, cellulose, gums, and food grade polymers. Applications and benefits of nanoencapsulation such as controlled release, protections, and taste masking will be explained in detail. Includes the most up-to-date information on nanoencapsulation and nanocontainer-based delivery of antimicrobials Presents nanomaterials for innovation based on scientific advancements in the field Provides control release strategies to enhance bioactivity, including methods and techniques for research and innovation Provides useful tools to improve the delivery of bioactive molecules and living cells into foods