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Carbonation of calcium aluminate cement pastes

This work discusses the results from accelerated tests intended to investigate the ways the different curing methods affect the carbonation of calcium aluminate cements pastes (CAC). The research was focused on the mineralogical composition of hydrated and carbonated samples. The compressive strengths and the porosity…

Structure of aluminosilicate melts produced from granite rocks for the manufacturing of petrurgical glass-ceramics construction materials

The aluminosilicate melt is a partly ordered phase and is the origin of glass for producing glassceramics and petrurgical materials. They are well extended used as construction materials for pavings and coatings. Its structure can be described in the terms of the aluminosilica tetrahedras coordination so-called Q spec…

Wastes based glasses and glass-ceramics

Actually, the inertization, recovery and valorisation of the wastes coming from municipal and industrial processes are the most important goals from the environmental and economical point of view. An alternative technology capable to overcome the problem of the dishomogeneity of the raw material chemical composition i…

Trace elements based classification on clinkers. Application to Spanish clinkers

The qualitative identification to determine the origin (i.e. manufacturing factory) of Spanish clinkers is described. The classification of clinkers produced in different factories can be based on their trace element content. Approximately fifteen clinker sorts are analysed, collected from 11 Spanish cement factories…

Combined Method for Quantitative Characterisation of Fluid Flow

A method has been proposed for quantitative characterization of the flow behaviour of fluids, which is an important problem of applied rheology. Particle Image Velocimetry technique has been used for visualization and measurement of the velocity field. The rheometric study of the fluid is aimed at determining the char…

Fiftieth anniversary of the journal "Últimos Avances en Materiales de Construcción"

The aim of the author is to present an historical survey of the birth, growth and development along the fifty years of the life of the scientific and technical magazine MATERIALES DE CONSTRUCCIÓN, mainly devoted to cement and concrete matters. This has been intended in the present paper taking into account four period…

Secondary raw materials for synthesising new kind of cements

The present paper is a comparative study of some characteristics of new belite cements obtained from two kind of wastes, which were used as secondary raw materials: fly ash (FA), of low CaO content, from coal combustion, and ash from incineration of municipal solid waste (MSWIA). Cements were synthesised in a range of…

Editorial

Non-Newtonian Fluid Flow Analysis with Finite Difference and Finite Volume Numerical Models

Suitability of finite difference method and finite volume method for computation of incompressible non newtonian flow is analyzed. In addition, accuracy of numerical results depending of mesh size is assessed. Both methods are tested for driven cavity and compared to each other, to results from available literature an…

The Lodge Rubberlike Liquid Behavior for Cheese in Large Amplitude Oscillatory Shear

The viscoelasticity of reduced-fat Cheddar and Mozzarella cheeses was characterized in small (parallel disk rheometer, go = 0.01) and large (sliding plate rheometer, 0.2< go <7) amplitude oscillatory shear at 40 and 60˚C. We deduced the linear relaxation spectrum from the small strain measurements. At large strain amp…

Das Rheologie-Handbuch – Für Anwender von Otations- und Oszillations-Rheometern

Towards the carbon fibers in the building industry

There are two mainstreams in the building industry in the area of carbon fibers: rehabilitation and use as building material. The using of carbon fiber as a building material is taking place slower than as rehab system due to the very low cost of traditional building materials, the limitations of composite structure m…

Designing concrete for durability

Some of the factors affecting the durability of modern concrete structures are discussed, with an emphasis on the problems caused by modern portland cements. This is followed by a description of some concrete durability issues of current interest, such as plastic shrinkage, seawater attack, and sulfate attack. The str…

Role of clay constituents in stone decay processes

Stone alterability/durability is depending upon a number of intrinsic and extrinsic factors among which "clay minerals" constituents, either diffused throughout the stone framework or as coating-filling of void spaces, can play an important role. Swelling-shrinking and aggregation-disaggregation phenomena occurring by…

Physico-mechanical properties of fabrics prepared from blends of sulphonated jute fibre with natural and synthetic fibres

The plain woven fabrics have been prepared from the blends of sulphonated jute fibre with natural and synthetic fibres, and their geometrical, physico-mechanical and drapping properties studied. It is observed that the blended fibre fabrics show improved textile properties, almost similar to those of the cotton fabric…

Viability of utilization of waste materials from ceramic products in precast concretes

The recycled and re-valuation process of waste materials involves studies lead to a deep acknowledges of them, finding applications for their intended use. The waste materials from ceramic products can be recycled into the construction sector, as arid or pozzolanic materials. The current work deals with the incorporat…

Phase separation frustrated by the long-range Coulomb interaction. II. Applications

The theory of first-order density-driven phase transitions with frustration due to the long-range Coulomb (LRC) interaction developed in paper I of this series is applied to the following physical systems: (i) the low-density electron gas, (ii) electronic phase separation in the low-density three-dimensional $t\ensure…

Renormalization of the Optical Response of Semiconductors by Electron-Phonon Interaction

In the past five years enormous progress has been made in the ab initio calculations of the optical response of electrons in semiconductors. The calculations include the Coulomb interaction between the excited electron and the hole left behind, as well as local field effects. However, they are performed under the assu…

INDUSTRIAL CRYSTALLIZATION AND PRECIPITATION FROM SOLUTIONS: STATE OF THE TECHNIQUE

Crystallization and precipitation from solutions are responsible for 70% of all solid materials produced by the chemical industry. Competing with distillation as a separation and purification technique, their use is widespread. They operate at low temperatures with low energy consumption and yield with high purificati…