Conflict of interest

containing steel slag and H-Cement (HC concrete) has eliminated the volume changes of the steel slag (calcium and magnesium expansion). There was no disruption of the cement compound and the contact zones between the grain of steel slag and the cement compound. This is confirmed by an increase in the concrete strength after the autoclaving process from 29.1 to 43.0 MPa (increase by 32%).

View on (a) HC concrete and (b) PC concrete after autoclaving.

From the results of our experimental investigation, it is possible to formulate the

a. H-Cement with the composition that is found to be outside of the EN 197-1 can be used similarly to traditional cements of medium-strength classes like 32.5R and 42.5N and for high long-term flexural strength. No kind of additional heat

b.H-Cement is suitable for use in ready-mixed concrete up to C30/37 strength class with a variety of plasticizers, which are compatible with it in the same

lignosulfonate-polycarboxylate plasticizers have been found to be the best in

c. H-Cement has under the conditions tested shrinkage-reducing properties. Shrinkage-reducing effect is also recorded in cement blends at replacement level of H-Cement by 5–15% wt. PC. No shrinkage-reducing admixture is

d.H-Cement has under the conditions tested ASR-mitigating property. The expansion of concrete is also suppressed when using cement blend with

e. High sulphate resistance of H-Cement is the result of a special composition; sulphate resistance of H-Cement was found by a 5-year test, the same with that

f. H-Cement is suitable for use in concrete with 100% replacement of natural aggregate by the artificial steel slag aggregate. No detrimental processes leading to disintegration of such concrete exposed to high temperature and

way as traditional cements. Lignosulfonate-based and combined

terms of workability of fresh mixtures standing for 60 min.

necessary in concrete when H-Cement is used.

replacement level of PC by 30% wt. H-Cement.

of sulphate-resistant CEM I 42.5 R-SR 0.

pressure were recognized.

148

treatment during early and later hydration is needed.

4. Conclusions

Figure 19.

Compressive Strength of Concrete

following conclusions:

The authors do not register any conflict of interest.
