Analysis of the available data indicates an increase in the activity of cement binder in the
ISSN: 2278-4853 Vol 10, Issue 9, September, 2021 Impact Factor: SJIF 2021 = 7.699
Asian Journal of Multidimensional Research (AJMR)
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AJMR
The optimal compositions of cement binders obtained with different contents of micro-filler
(ash TPP) according to [4] are shown in table 1.
TABLE 1OPTIMUM CEMENT BINDERS
№
Components of cement-ash binder with an optimal
grinding time of 45 min
Compressiv
e strength,
МPа, R* 28
W*/
W
1).Portland
cement clinker,
%
2) gypsu
m block, %
Ash,
%
3) additive
Poly-ans-2,
%
1
82,0
3
15
0,002
75,9
х)
0,220
2
72,4
2,6
25
0,002
77,6
х)
0,225
3
57,9
2,1
40
0,002
67,2
х)
0,245
4
38,6
1,4
60
0,002
37,6
х)
0,285
1) Tested halves of beams 4x4x4 cm in size (number of samples 3);
2) The optimum amount of gypsum stone was found to be 3.5% by weight of Portland cement
clinker;
3) The optimal amount of Poly-ans-2 additive is determined by the weight of the binder.
The performed design of the optimal compositions of cement binders for corrosion-resistant
concrete according to the general method of the ISC theory allows us to determine the optimal
region of structures with high quality characteristics in the range of water-binders and to select
the most rational one from them [8-25].
CONCLUSIONS
Thus, by increasing the fineness of grinding, it is possible to increase the activity of the cement-
ash mixed binder, and based on the dependence of the latter on the dosage of ash and the
duration of grinding (Fig.3,4) it is possible to allocate three groups of the binder:
1.
- with ash dosage up to 20%, when the activity of cement-ash binder practically does not
differ from the original additive-free cement at the same energy costs for grinding;
2.
- with a dosage of ash from 20 to 40-50%, when there is a proportional decrease in the
activity of the binder and then in this range it is rational to compensate for the decline in the
strength of the binder by increasing the dosage of ash by increasing the fineness of grinding;
3.
- with a dosage of ash more than 50%, when there is a noticeable decrease in the activity of
the binder, and the latter is difficult to compensate for the increase in the fineness of the
binder due to the increase in the duration of grinding.
4.
-An increase in the activity of the mixed binder was found due to the introduction of a
gelpolymer additive into the composition during grinding of the binder [10,11]. The reagent
polymer polyacrylonitrile hydrolyzed stabilizing was used. In the course of preliminary
experiments, it was found that the greatest effect is achieved when it is introduced in
hundredths of the mass of cement. On the basis of the above, it follows that the methods of
determining the activity of cement by the General method of designing the optimal
composition of CONCRETE serve as a tool for operational control of the technological
ISSN: 2278-4853 Vol 10, Issue 9, September, 2021 Impact Factor: SJIF 2021 = 7.699
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