Question

Which of the following tests is NOT performed to test the quality of clay/concrete tiles?

• A. Visual test
• B. Water absorption test
• C. Three edge bearing test
• D. Stiffness test

Hint:

Clay/Concrete tiles $\rightarrow$ Crushing strength (Three-edge bearing), Water absorption, Freezing test. Plastic pipes $\rightarrow$ Pipe stiffness test.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Quality control and physical strength testing of rigid agricultural drain tiles (clay/concrete) vs flexible thermoplastic corrugated tubing (corrugated PVC/PE).

Step 2: Detailed Explanation:
Standard quality tests for rigid clay and concrete agricultural drain tiles (ASTM C4 IS 8968) include:
1. Three-Edge Bearing Test: Determines crushing load/strength under rigid line loads.
2. Water Absorption Test (Boiling/Immersion): Measures tile porosity and frost durability.
3. Visual and Dimensional Inspection: Checks cracks, straightness, and blisters.
Pipe Stiffness Test (Parallel-plate deflection) is conducted on flexible thermoplastic plastic pipes (corrugated PVC/PE), not on rigid brittle clay/concrete tiles.

Step 3: Final Answer:
Hence, Stiffness test is NOT performed on clay/concrete tiles, matching option (D).