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The investigations of carbonic acid attack on cement mortar revealed the problems in performing and evaluating tests on corroded specimens for the determination of mortar durability. The investigations carried out to study the influence of the blast-furnace slag content in cement on the corrosion of mortar specimens are reported. One portland cement and four blast-furnace cements with a graded slag content have been used. The specimens were exposed for 5 years to acidic water containing 100 mg of aggressive carbon dioxide per litre at 10°C.
The mortar specimens of blast-furnace cements showed considerably less corrosion than those made with portland cement, and thus, a lower loss of strength. An increasing acid resistance with a higher content of the blast-furnace slag could be determined clearly by the loss of mass and the leaching of lime; however, only a tendency to an increasing resistance was measured by strength tests.
corrosion, acid resistance, durability, chemical attack, carbonic acid, mortars, cements, flexural strength, compressive strength, nondestructive tests, building materials
Doctor of Engineering and scientific assistant, Institute for Buildings Research of the Technical University of Aachen, Aachen,