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In the present investigation, based on pore solution analyses, the mechanisms of Friedel's salt formation and the related chemical processes taking place in mortar due to chloride binding are dealt with. Pore solutions from mortars containing NaCl and CaCl 2 added during mixing were analyzed....
Differential scanning calorimetry (1,2) is a very easy tool to use for the identification of blended organic fibres in cement composites. It necessitates the careful extraction of fibres from an inorganic matrix after treatment with a dilute formic acid solution. The selective extraction and...
A series of experiments was conducted to evaluate two ilmenite plant dusts as an alternative to barite as weight material for oil well cement slurries. These dusts had a similar particle size distribution to ground barite. Rheological investigations show that one of the dusts could be applied if...
Chloride diffusion coefficient and gas permeability of concrete were experimentally determined. The relationship between them is discussed. Chloride diffusion coefficient was determined using saturated concrete by an accelerated electrical testing method. The chloride diffusion coefficient was...
The retarding effect of sodium silicate on high alumina cement (HAC) hydration is demonstrated. The effect of sodium silicate addition on phase formation in HAC paste during hydration is studied. A reaction mechanism involving strätlingite formation in the HAC-sodium silicate system is...
This paper describes a laboratory program undertaken to examine the macrostructural implications of applying electrochemical chloride ion extraction (ECE), to concrete structures. An examination is made of the effect of ECE and, thus ionic redistribution on the anodic and cathodic regions of...
Pull-out tests were carried out on deformed steel fibers embedded in cement-based matrices. Four matrices including plain cement paste, cement paste with 10% silica fume, cement paste with 10% high reactivity metakaolin (HRM), and cement paste with a combination of 5% silica fume and 5% HRM in...
The microstructures of some alkali-silica reactive aggregates used in China have been examined by means of an optical microscope. The aggregates included andesite, tuff, basalt, felsite, diorite-porphyrite, basaltic volcaniclastic rock, chert, siliceous dolostone and limestone, meta-granite,...
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