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Expansion of Portland Cement mortar due to internal sulfate attack
An exploratory test program was designed to determine the expansive potential of portland cement mortar due to internal sulfate attack initially moist-cured at high temperature. Expansion of cement mortars made with six different portland cements was measured. The effect of different test parameters, such as, pre-storage time, curing temperature, type of sand, sand/cement ratio, specimen size and pre-treatment, on expansion behavior was determined. A significant delayed expansion of cement mortars, made with portland cement having a Blaine fineness greater than 5000 cm2/g and SO3 content greater than 3.5 mass % (e.g., cement C-4 and C-5) and initially moist-cured at less than 85 deg C, occurs. Delayed expansion of cement mortars made with portland cement that is suspect of being prone to internal sulfate attack is accelerated and enhanced by reducing the pre-storage time, increasing curing temperature and thermal drying. The delayed expansion of cement mortars made with fine sand containing about 25 % quartz and 34 % limestone is significantly greater than sand containing predominantly limestone and little or no quartz.
Expansion of Portland Cement mortar due to internal sulfate attack
An exploratory test program was designed to determine the expansive potential of portland cement mortar due to internal sulfate attack initially moist-cured at high temperature. Expansion of cement mortars made with six different portland cements was measured. The effect of different test parameters, such as, pre-storage time, curing temperature, type of sand, sand/cement ratio, specimen size and pre-treatment, on expansion behavior was determined. A significant delayed expansion of cement mortars, made with portland cement having a Blaine fineness greater than 5000 cm2/g and SO3 content greater than 3.5 mass % (e.g., cement C-4 and C-5) and initially moist-cured at less than 85 deg C, occurs. Delayed expansion of cement mortars made with portland cement that is suspect of being prone to internal sulfate attack is accelerated and enhanced by reducing the pre-storage time, increasing curing temperature and thermal drying. The delayed expansion of cement mortars made with fine sand containing about 25 % quartz and 34 % limestone is significantly greater than sand containing predominantly limestone and little or no quartz.
Expansion of Portland Cement mortar due to internal sulfate attack
Ausdehnung von portlandzementhaltigen Mörteln aufgrund eines inneren Sulfatangriffs
Fu, Y. (author) / Ding, J. (author) / Beaudoin, J.J. (author)
Cement and Concrete Research ; 27 ; 1299-1306
1997
8 Seiten, 8 Bilder, 6 Tabellen, 6 Quellen
Article (Journal)
English
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