3.9. Deleterious Materials in Aggregates

Try these first

1. 1.

   What is a deleterious material?

   Hint

   Think about materials that could weaken concrete.

2. 2.

   Name one effect of clay on concrete.

   Hint

   What does clay do to the concrete?

3. 3.

   What is the maximum permissible limit for clay lumps in aggregates?

   • 1%
   • 2%
   • 3%

   Hint

   Recall the standard percentages for clay.

4. 4.

   True or False: Organic impurities have no effect on the setting time of concrete.

   • True
   • False

   Hint

   Think about what slows down concrete's hardening.

5. 5.

   Considering a concrete mix with a high percentage of organic impurities, hypothesize potential repercussions on the structural integrity of a building.

   Hint

   What happens if the concrete delays curing?

6. 6.

   Propose a quality control plan to ensure allowable limits are maintained for deleterious materials in a concrete project, referencing IS standards.

   Hint

   Consider how testing and monitoring practices could lead to better outcomes.