How to estimate the mineralogical composition (C3S, C2S, C3A, C4AF etc.) of cement? Is there any analytical instrument or can we estimate it from oxide composition?
Thanks.
try using X-ray diffraction. Identification is almost unequivocal and if you are lucky you can even quantify them
dear Warda, I used the expression "if you are lucky" cause the quantification of those phases with the Reitveld method is not an easy task. Even the experts in the field tell you that accurate QPA on clinkers, cements, mortars, concrete is in several cases art and believing. Just remember that in most cases you have also the CSH (giving an amorphous-ish hump) and other crystalline phases that play a role in decreasing the accuracy
Thank you Dr. Leoni and Dr. Ashraf for your answers
Would you please provide any link or reference paper for this?
I have found an article showing "The Bogue calculation of cement mineral composition". Would you please tell me whether it is right or not? The link of the article is given below:
http://iti.northwestern.edu/cement/monograph/Monograph3_6.html
Thanks.
Bogue equations can be used to estimate the main compounds of a cement from knowing the main oxides :
BOGUE CALCULATION
======================
C3S = 4.0710CaO-7.6024SiO2-1.4297Fe2O3-6.7187Al2O3
C2S = 8.6024SiO2+1.0785Fe2O3+5.0683Al2O3-3.0710CaO
C3A = 2.6504Al2O3-1.6920Fe2O3
C4AF = 3.0432Fe2O3
=======================
More details about the assumptions used and an example of calculations are given in the attached URL.
Regards
According to Bogue equations and knowing the main oxides, we can be used to estimate the main compounds of a cement as following :
- C3S%= 4.071CaO- 7.6 SiO2 – 6.718 Al2O3 - 1.43Fe2O3 – 2.852 SO3
- C2S % = 2.87SiO2 – 0.7544C3S
- C3A % = 2.65 Al2O3 – 1.692 Fe2O3
- C4AF% = 3.043 Fe2O3
just to know the percentage of calcium oxide (CaO) should be taken without free lime.
- Badges
- Science topic