4.4. L-Box Test

Try these first

1. 1.

   What does the L-Box Test measure?

   Hint

   Think about what characteristics of SCC are essential for filling molds.

2. 2.

   What is a good H2/H1 ratio for SCC?

   Hint

   Consider what this ratio indicates about the flowability.

3. 3.

   What is the main purpose of the L-Box Test?

   • To measure concrete strength
   • To assess passing ability of SCC
   • To check for air content

   Hint

   Remember why proper flow is important for SCC.

4. 4.

   True or False: An H2/H1 ratio of 1 indicates poor passing ability in SCC.

   • True
   • False

   Hint

   Think about what a ratio of 1 signifies for passing ability.

5. 5.

   Design an SCC mix that aims for an ideal L-Box Test result. Discuss the considerations necessary to achieve a passing ability close to 1.

   Hint

   Consider how mix design affects fluidity and stability.

6. 6.

   Given an L-Box Test that shows an H2/H1 ratio of 0.7, how would you alter the mix to enhance passing ability? Present a detailed plan for adjustments.

   Hint

   Think about how each component contributes to flow and stability.