Dear experts,
I should make Test to determine activity of granulated slag, could you give me information about method how to conduct this experiment.
Thank you in advance
GLT
dear experts,could you give me information about method of determinate reactiviti granulated slag and pozzolan?
chari
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The two modulus given below have high correlation to 7 and 28 day strength developments.
CaO + MgO + Al2O3
---------------------------- > or equle to 1
SiO2
CaO + 0.5 MgO + Al2O3 + CaSO4
--------------------------------------------- > or equle to 1.5
SiO2 + MnO
This composition modulus is of importance for rapid
quality control of cement slag.
For the purpose of assessing the contribution to
strength made by slag a HYDRAULIC MODULUS is recommended.
To calculate this modulus one has to prepare
1 .Portland slag cement
2 Portland cement
3 Portland ground with quartz [ground to 4000 cm2/gm]
If the 28 day strength in 1 is A, 2 is B, 3 is C then
70 A - C
Hydraulic index at [ ------ ] = ------------- X 100
30 B – C
{70/ 30 means the slag cement have 30% slags. If the slag is non hydraulic its effect should be similar to the inert ground sand and then index is zero. If it is cementious as Portland its index is 100 %.}
In practice the index found to very with proportion of slag present in the cement and it is not necessary the same with 50/50, 30/70, 70/30 mix.
The glass content, as determined by microscopy in slags quenched in different ways have been related to the strength values of respective slag cements. From the various studies reported it appears that influence of chemical composition on the hydrolic properties of the slag can be recognized much more clearly then the influence of glass content which is maintained at 90-95 % level.
Fluorence of vitrous slags could be used for evaluation their hydraulicity. This is basically the measure of glass content. The index is given by
CaO
% red fluorescing glass particle X ----------
SiO2