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The use of industrial wastes as an alternative fuel in the cement industry is a reality in several countries because wastes are removed and economic incomes are obtained preserving non-renewable energy resources. In the present work, the effect of the addition of small amounts of ashes from...
The possibility of using finely ground waste glass as partial cement replacement in concrete was examined through three sets of tests: the lime-glass tests to assess the pozzolanic activity of ground glass, the compressive strength tests of concrete having 30% cement replaced by ground glass to...
Sand addition was found to decrease the specific heat and increase the thermal conductivity of cement, in contrast to the opposite effects of silica fume addition. The thermal conductivity increase due to sand addition was much greater when silica fume was present. The thermal conductivity...
The effect of calcination temperature on Belbeis clay and Sammlout limestone as well as hydration characteristics of calcined products were investigated. Three mixes 50/50, 60/40, 70/30 wt.% clay-limestone were calcined at 700, 800, 900, and 1,000°C for 2 h, then hydrated for up to 90 days. The...
Sulfate attack on Portland cement concrete is often said to arise from each of two major sulfate reactions: (1) The sulfate ions react with C 3 A and its hydration products to form ettringite with an increase in volume that results in expansion and subsequent cracking of the concrete; (2) The...
The leaching of cement-based materials is analysed through experimental and numerical results. From the experimental point of view, the leaching processes of a pure cement paste and a mortar are characterised by the degraded depths and the cumulative amount of leached calcium at different times....
This work has studied the influence of the combined action of silica fume and limestone on strength development, porosity, pore structure and morphological features in the system where 15 wt% of cement was substituted by finely ground limestone. Silica fume was added in amounts of 0, 2, 5, 8, 11...
The development of a new image analysis technique for the automatic detection and quantification of microcracking in cement-based materials is described. An impregnation technique is used to highlight microcracks and other microdefects (porosity, air bubbles) present in the concrete matrix....
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