Bleeding of Concrete Definition: Bleeding: Movement of water to the surface of freshly placed concrete. Causes: Water Content: High water content in the mix leads to excess water rising to the surface. Aggregate Grading: Poorly graded aggregates can contribute to bleeding. Cement Fineness: Coarser cement particles can increase bleeding. Mix Proportions: Incorrect mix proportions can exacerbate bleeding. Water-Cement Ratio: High water-cement…
Segregation of Concrete Definition: Segregation of concrete refers to the separation of the components of fresh concrete, which negatively impacts its uniformity and quality. Types of Segregation: Coarse Aggregate Segregation: Larger particles separate from the rest of the mix and settle at the bottom. Paste and Aggregate Segregation:
Cohesion of Concrete Key Concepts: Definition of Cohesion: Refers to the property that describes the internal molecular attraction within concrete, which holds its particles together. Importance in Concrete:
Factors Affecting Workability Definition of Workability: Workability refers to the ease with which concrete can be mixed, placed, compacted, and finished. Factors Affecting Workability: Water Content:
Workability of Concrete Definition: Workability of concrete refers to the ease with which freshly mixed concrete can be mixed, placed, compacted, and finished. Key Factors Influencing Workability: Water Content:
Properties of Fresh Concrete Workability Definition: The ease with which concrete can be mixed, placed, and finished. Factors Influencing Workability: Water content Mix proportions Aggregate characteristics Admixtures
IS Specifications of Admixture Key Points: Definition of Admixture: An admixture is a material other than water, aggregates, hydraulic cements, and fibers added to concrete or mortar before or during its mixing. Purpose of Using Admixtures:
Workability Admixtures Definition: Workability Admixtures: Chemicals added to concrete mix to improve its workability. Purpose: Enhance ease of mixing, transporting, placing, and finishing concrete. Maintain consistency without changing the water-cement ratio. Types:
Compatibility of Admixture Key Points: Definition of Admixture: Admixtures are materials added to concrete to modify its properties. Purpose of Admixture: Improve workability Accelerate or retard setting times Increase strength and durability Reduce water content
Colouring Admixtures Definition and Purpose Colouring Admixtures: Adding pigments to concrete and other building materials to achieve specific colors. Purpose: Enhance aesthetic appearance; meet architectural requirements. Types of Pigments Inorganic Pigments:
