Cohesion of Concrete

Cohesion of Concrete

Key Concepts:

1. Definition of Cohesion:

   • Refers to the property that describes the internal molecular attraction within concrete, which holds its particles together.

2. Importance in Concrete:

   • Ensures the concrete mix is workable.
   • Helps in achieving a uniform and stable mixture, preventing segregation.

3. Factors Affecting Cohesion:

   • Water Content: Adequate water content is necessary to ensure the mix is cohesive without being too watery.
   • Aggregate Size and Type: Proper grading and the size of aggregates impact the cohesiveness.
   • Cement Content: Sufficient cement acts as a binding agent, enhancing the mix's cohesion.
   • Admixtures: Chemical admixtures can be used to modify the cohesiveness of the concrete.

4. Testing Cohesion:

   • Various tests and empirical observations are employed to assess the cohesion of concrete, ensuring it meets the necessary standards for construction.

5. Impact on Concrete Quality:

   • High cohesion improves the durability and strength of the hardened concrete.
   • Reduces potential defects such as voids and honeycombing within the structure.

Study Recommendations:

• Focus on the relationship between cohesion and the overall workability of concrete.
• Understand the balance of water content and its critical role in maintaining cohesive concrete.
• Study the influence of different aggregate sizes and types on the uniformity of the mix.
• Learn about the types of admixtures that can adjust cohesive properties.
• Familiarize yourself with practical tests for measuring cohesion and their importance in quality control.