Good morning,

There are several meanings of the word "clay" in different fields of knowledge. One of these values can be found in the article. I hope the article will help to understand the meaning of the word.

Please, have a look a paper at Attachment

de Morais AH, Roecker S, Salvagioni DA, Eler GJ. Significance of clay art therapy for psychiatric patients admitted in a day hospital. Invest Educ Enferm. 2014;32(1):128-38. doi: 10.1590/S0120-53072014000100015.

Hi Vladimir 

thanks for your answer

but my field was " geotechnic, soil and foundation " 

we have some technical word in field such as pre-consolidate, over-consolidate and aged clay . 

thanks

OK, I hope this paper will help you. Good luck.

Dear Mr. Saadatfar,

the terms sound a bit strange for me and I wonder in which context you are using these terms. Could you please clarify this by citing some examples. Maybe based upon these clarifying words  colleagues will add some answers. I have been dealing with clay minerals since many years but these terms side-by-side with each other need some more information, otherwise researchers will have difficulties to come to grips with this Q & A launch.

Best regards

Harald G. Dill

Hi Mr. Dill

this document. that i attached - for aged clay

or this :

http://link.springer.com/chapter/10.1007/3-540-32895-5_2

for aged clay

Aging usually result in some changes  of properties, and strength gain.The meaning her is that you compacted the clay in layers up to the required height or thickness and left it for some time to age.The properties will change somewhat with aging due to environmental factors such as evaporation,rainfall,etc.This is different from the well known preconsolidation or overconsolidation which means that the clay was subjected to a larger pressure than the existing pressure at present.   

thank Mr Nabil.

You may also note that after remolding a clay specimen will continue to gain strength with time.This phenomenon  is referred to as thixotropy.Thixotropy is a time dependent reversible process.The loss of strength is gradually regained with time when the material is allowed to rest. See Principles of Geotechnical Engineering By B.M.Das 7th edition