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EFFECT OF DELAYING ADDITION TIME OF SMF SUPERPLASTICIZER ON HYDRATION CHARACTERISTICS OF BLENDED CEMENT PASTES
Faculty
Science
Year:
2012
Type of Publication:
Article
Pages:
245-253
Authors:
El-Didamony, H, Heikal, Mohamed, Al-Masry, S
Journal:
CERAMICS-SILIKATY INST CHEMICAL TECHNOLOGY, DEPT GLASS CERAMICS
Volume:
56
Research Area:
Materials Science
ISSN
ISI:000316240600010
Keywords :
Delaying addition time, Superplasticizer, Compressive strength and Hydration characteristics
Abstract:
This paper aims to study the effect of delaying addition time of sulphonate melamine formaldehyde superplasticizer (SMF) on the rheology and hydration characteristic of blended cement pastes up to 90 days. The optimum dosage of superplasticizer was chosen as 1.0 mass \%, this dosage gives the higher compressive strength and bulk density as well as lower total porosity. The optimum delaying time of superplasticizer was 7.5 min which gives the highest fluidity, bulk density, compressive strength and chemically combined water contents of cement pastes, whereas, the delaying addition time of 15.0 min shows the lower values of bulk density, compressive strength and combined water contents. This is attributed to the reduction of hydration rate of cement, due to the formation of a polymer film around the cement particles and/or hydrated products. The superplasticizing effect improved with a delayed sulphonate melamine formaldehyde superplasticizer addition time.
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