S'identifier

Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate resistance.

White and colored Portland cements are used primarily where aesthetic considerations are paramount, such as precast curtain-wall panels, facing panels, terrazzo floors, stucco, finish-coat plaster, and tile grout. These cements are more expensive due to stringent production requirements to avoid impurities and achieve color uniformity.

Expansive cement expands during the early hardening period to compensate for drying shrinkage. There are three types available: K, M, and S, which differ primarily in their chemical composition. Type K is designed for general shrinkage control, Type M is for sulfate resistance, and Type S is for high sulfate exposure. Each type is designed to minimize cracking by countering the effects of shrinkage. This type is suitable for situations requiring minimal volume change to prevent cracking.

Waterproof Portland cement includes additives like calcium stearate or aluminum stearate mixed into the Portland cement clinker during grinding, enhancing the cement's resistance to moisture penetration.

Tags
Portland Blast furnace CementGranulated Blast furnace SlagEarly StrengthMass Concrete StructuresMarine EnvironmentsHeat Of HydrationSulfate ResistanceWhite Portland CementColored Portland CementAesthetic ConsiderationsExpansive CementChemical CompositionShrinkage ControlWaterproof Portland CementMoisture Penetration

Du chapitre 4:

article

Now Playing

4.10 : Types of Cement II

Introduction to Concrete

83 Vues

article

4.1 : Concrete

Introduction to Concrete

274 Vues

article

4.2 : Portland Cement

Introduction to Concrete

163 Vues

article

4.3 : Hydration of Cement

Introduction to Concrete

147 Vues

article

4.4 : Strength and Heat of Hydration

Introduction to Concrete

165 Vues

article

4.5 : Fineness of Cement

Introduction to Concrete

102 Vues

article

4.6 : Setting Time of Cement

Introduction to Concrete

100 Vues

article

4.7 : Soundness of Cement

Introduction to Concrete

114 Vues

article

4.8 : Strength of Cement

Introduction to Concrete

105 Vues

article

4.9 : Types of Cement I

Introduction to Concrete

86 Vues

article

4.11 : Pozzolans

Introduction to Concrete

78 Vues

JoVE Logo

Confidentialité

Conditions d'utilisation

Politiques

Recherche

Enseignement

À PROPOS DE JoVE

Copyright © 2025 MyJoVE Corporation. Tous droits réservés.