Hi everyone,
Some changes occur in clay minerals crystalline structure due to stabilization by additives like lime or cement. Anyway, it is called that this is because of weathering action of the stabilizer on the clay minerals. what exactly is weathering action??
MJM
Dear Mohamad Jamali moghadam,
See these link which may useful for your research work.
All the best
http://www.sciencedirect.com/science/article/pii/S2214391216300897
https://file.scirp.org/pdf/OALibJ_2016030314572757.pdf
http://soils.stanford.edu/classes/GES166_266items/EST_1999_33_3140_Ford.pdf
http://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1511&context=rtd
Dear Mr. Moghadam,
Portland cement is a hydraulic binder setting under water or in air made up by the 3 components:
C2S (belite) = 2CaO.SiO2, C3S (alite) = 3CaO.SiO2 and C3A(aluminate) = 3 CaO.Al2O3.
It formed in a rotating kiln by firing. The same is true for lime
Calcining and decarbonization of limestone is conducted at temperatures of appr. 1100°C
The number of clay minerals are manifold and where do you see any crystallographic change in the sheetsilicates caused by the above chemical compounds during setting? The reaction is quite similar to what happens when creating concrete. You can use concrete or jetcrete in underground systems to stabilize walls or create roof support without any intracrystalline changes in the argillaceous material in contact.
The same ideas you may also apply to natural processes like weathering of soil.
Best regards
H.G.Dill
Dear Mr. Moghadam:
As to your question what weathering is, I would like to refer to two reviews of mine, published only recently and available on Researchgate:
DILL, H.G., WEBER, B. and BOTZ, R. (2013) Metalliferous duricrusts (“orecretes”)markers of weathering: A mineralogical and climatic-geomorphological approach to supergene Pb-Zn-Cu-Sb-P mineralization on different parent materials.- Neues Jahrbuch für Mineralogie Abhandlungen, 190: 123-195.
DILL, H.G. (2016) Kaolin: soil, rock and ore From the mineral to the magmatic, sedimentary, and metamorphic environments.- Earth Sciences Reviews 161: 16-129.
DILL, H.G. (2017) Residual clay deposits on basement rocks: The impact of climate and the geological setting on supergene argillitization in the Bohemian Massif (Central Europe) and across the globe.- Earth Sciences Reviews 165: 1-58.
DILL, H.G. (2017) An overview of the pegmatitic landscape from the pole to the equator – Applied geomorphology and ore guides. - Ore Geology Reviews (in print)
There you will find charts to show how minerals during weathering behave.
I wish you much success
H.G.Dill
You may find this useful:
https://www.researchgate.net/publication/222509520_The_effect_of_clay_content_in_sands_used_for_cementitious_materials_in_developing_countries
No, I don't know why it's blue either.
Article The effect of clay content in sands used for cementitious ma...
Have you seen this article:
Article Alkali binding in cement pastes
?