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Structural Engineering :: Technology

Alkali-Silica Reaction and High Performance Concrete - Answers the question if high-performance concrete is susceptible to alkali-silica reaction. The paper contains details on the alkali-silica reaction mechanism and the factors influencing it as well as an overview on available test methods (ASTM C1260 and C227). Besides an abstract the fulltext is available as PDF (24 pages, 1.3 MB).
Meta Description: [ Damage due to alkali-silica reaction (ASR) in concrete is a phenomenon that was first recognized in the U.S. since 1940 and has since been observed in many countries. Despite numerous studies published, the ]

Argument for Using Coarse Cements in High-Performance Concretes. - Investigation of the effects of particle size distribution and water-to-cement ratio on hydration kinetics. Printed in: Cement and Concrete Research, 1999. Besides an abstract, the fulltext is available as PDF (371 kB).
Meta Description: [ The NIST cement hydration microstructural model and experimental studies are used to investigate the effects of particle size distribution and water-to-cement ratio on hydration kinetics. Cement hydration is limited by ]

Assessment of Commercial Corrosion Inhibiting Admixtures for Reinforced Concrete - This report conveys the results of a three-part laboratory study of corrosion inhibiting admixtures in concrete. The abstract is available in HTML and the fulltext as PDF (1.4 MB).

Comparison of Concrete Rheometers - Comparison of measurements from five types of concrete rheometers (four of them are commercial available). The aim was to provide data to establish correlations among them.
Meta Description: [ The aim of the present project was to compare measurements from the five types of concrete rheometers to provide data to establish correlations among them. As a matter of fact, differences between the various ]

404 Concrete with Greater Resistance to Acid and to Biogenic Sulfuric Acid Corrosion - Comparison on the resistance to biogenic sulfuric acid corrosion of mortars based on Portland cement and high-alumina cement. Informations about the stresses on the concrete in sewer systems and the formation of sulfuric acid by microorganisms and how to improve the resistance of concrete to attack by acid. [PDF, 1.9 MB]

Curing of High Strength Concrete Using Lightweight Aggregates - Report about tests with prewetted lightweight aggregates as a water supply in high strenght concrete. [PDF, 468 kB]

Fresh Concrete Rheology - Recent Developments - An overview of the tests that are commonly used to measure the rheology of fresh concrete and methods to predict the flow of concrete from either compositon or laboratory tests. Materials Science of Concrete VI. Proceedings, 2001.
Meta Description: [ The design of concrete with specified properties for an application is not a new science, but it has taken on a new meaning with the wide use of high performance concretes (HPC). The following properties are related to ]

404 Heat-insulating from no-fines Lightweight Concrete - The major variables influencing the thermal conductivity of masonry materials are illustrated by taking blocks made from no-fines lightweight concrete as an example. With notes for an optimized product development. Reprint from Betonwerk Fertigteiltechnik 7/1999. [PDF, 1.2 MB]

Influence of Mineral Admixtures on the Rheology of Cement Paste and Concrete - Rheological tests on cement paste were used to successfully select the type and dosage of mineral admixtures that improved concrete workability.
Meta Description: [ Rheological tests on cement paste were used to successfully select the type and dosage of mineral admixtures that improved concrete workability. Among the six different mineral admixtures tested, the ultra fine ]

Methods for Investigation of the Hydration Process in Cementitious Materials - Comparison of results investigating the hydration process in cementitious materials. Methods used are ultrasound, scanning electron microscopy and nuclear magnetic resonance spectroscopy.

Modified Slump Test to Measure Rheological Parameters of Fresh Concrete - The ease of placement of concrete depends upon at least two physical properties, the yield stress and plastic viscosity. Currently the most common field test is the slump test, and it is related only to the yield stress. Therefore, a simple field test method intended to provide an evaluation of the two Bingham rheological parameters, yield stress and plastic viscosity, was developed. Description of apparatus and test procedure.
Meta Description: [ The ease of placement of concrete depends upon at least two physical properties, the yield stress and plastic viscosity. Currently the most common field test is the slump test, and it is related only to the yield stress. ]

404 Optimization of the Mixture of no-fines Lightweight Concrete - Details on the failure mechanisms of the texture and on the effects of aggregates, bonding agents and additives. [PDF, 828 kB]

Resistance of Portland Cement Mortar to Chemical Attack - A report on a study on the resistance of concrete to chemical attack by various inorganic and organic compounds, undertaken using mortar bars (1.5 x 1.5 x 10 cm). About 1200 specimens have been placed under test, many have been exposed for more than two years. [PDF, 3.0 MB]

Stress Due to Alkali-Silica Reaction in Mortars - A test method and test apparatus is presented. It does not measure the length change but measures the stress generated by the swelling of the gel. The force required to prevent expansion is measured over time while the specimen and frame are immersed in a solution of 1-N NaOH at 50°C. With some test results.
Meta Description: [ Alkali-silica reaction (ASR) causing deterioration of mortars and concretes is due to the swelling of gel formed by the reaction of alkali in cement-based materials with reactive silica in aggregates, in the ]

Technical Dictionary of European Mortars - EMODICO - A compendium of terms and definitions concerning mortar products and their use, available in English, French, German, Spanish and Portuguese. The European Mortar Industry Organization (EMO) prepared this document in order to make technology exchanges easier.

Ultrasonic non-destructive testing for concrete - Photo and short description of the testing facilities at the National University of Singapore.

Visible Cement Dataset - A collection of three-dimensional data sets of hydrating cement, Plaster of Paris, and common brick material, all obtained using x-ray microtomography at the European Synchrotron Radiation Facility in Grenoble, France. Each data set includes a description of the sample, the raw 3-D data, and several two-dimensional images extracted from the raw data. Also included are several C utility programs useful for exploring these datasets.