Alkalies in portland cement clinker occur as sulfates and, depending on the amount of SO3 available, may also be present in calcitun silicate and aluminate phases. Introduction of alkalies into clinker minerals modifies their crystal structure which, in turn, can change their hydraulic reactivity. A
Effect of alkalies on portland cement hydration II. Alkalies present in form of sulphates
β Scribed by I. Odler; R. Wonnemann
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 643 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0008-8846
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β¦ Synopsis
Alkalies present in cement in the form of Na?SO 4 and/or K2SO 4 do not alter the progress of C3S and C3A hydration. The setting time becomes accelerated especially with K2SO 4 due to the formation of syngenite CaSO4.KpSO4"HpO. The compressive strength
π SIMILAR VOLUMES
Na20 and K20 in absence of S03 are incorporated preferentially into the C3A phase of portland clinker altering its modification from cubic to orthorhombic. The hydration of Na20 doped C3A is retarded and that of K20 doped C3A accelerated in the resultant cements. The progress of C3S hydration and st
Conduction calorimetry has been used to study the patterns of early heat evolution during the hydration of Portland cement. In particular, the effect of sulphate on the rate of heat liberation has been investigated with reference to the differences observed depending on whether the sulphate is prese
Cement pastes made with different water-cement ratios were hydrated at different temperatures for different times. The main factor influencing the strength properties of the obtained samples was found to be their porosity, however pores with radii of less than 10 nm affected the resultant strength o