What is meant by Thixotropy ?
- AProperty of a material which is manifested by its resistance to flow
- BThe ratio of the unconfined compression strength in the natural or undisturbed state to that in the remoulded state
- CThe compressive stress at failure, giving due allowance to the reduction in area of cross-section
- DPhenomenon of strength loss-strength gain, with no change in volume or water contentCorrect
Solution
Concept
Thixotropy of clays
Step-by-step solution
1. Resistance to flow = viscosity (a). 2. Ratio of undisturbed to remoulded strength = sensitivity (b). 3. Compressive stress allowing for area change = true stress (c). 4. Loss of strength on remoulding and its regain with time, at constant volume and water content = thixotropy (d).
Explanation
Thixotropy is the time-dependent regain of strength by a remoulded clay without any change of volume or water content.
Why the other options are wrong
(a) viscosity; (b) sensitivity; (c) true compressive stress.
Shortcut
Thixotropy = strength regain with time.
Common mistake
Choosing sensitivity.
Correct answer: D) Phenomenon of strength loss-strength gain, with no change in volume or water content