#40 Mineral Admixtures | GGBS | Part 2 | Properties | Admixtures & Special Concretes

Welcome to 'Admixtures and Special Concretes' course ! This lecture continues the discussion on ground granulated blast-furnace slag (GGBFS), a mineral admixture used as a cement replacement in concrete. The lecture focuses on the properties of GGBFS, including its fineness, density, and availability. It examines the expectations from slag in concrete, such as strength gain, microstructure, and durability, especially in marine environments.A significant portion of the lecture is dedicated to chloride binding, a crucial aspect of slag concrete's durability. It explains how the alumina in slag reacts with chlorides to form non-expansive compounds, thereby reducing the risk of corrosion in steel reinforcement.The lecture then examines the factors governing slag performance, including chemical composition, alkali concentration, reactive silica content, fineness, and temperature. It emphasizes the importance of understanding slag hydration, covering activation methods like alkali and sulfate activation. The discussion also differentiates between geopolymers and alkali-activated slag. NPTEL Courses permit certifications that can be used for Course Credits in Indian Universities as per the UGC and AICTE notifications. To understand various certification options for this course, please visit https://nptel.ac.in/courses/105106225 #GGBFS #Slag #Concrete #MineralAdmixtures #CementReplacement #Durability #ChlorideResistance