Three series of mixtures were made, which are presented in Table 5 in mass proportions and in the Table 6 in percentage proportions, by mass. The obtained mixtures were characterized by good workability, after filling the molds it was enough to compact it by hand. The ZK1 was the basic variant of the mixture with the following composition: GGBFS, activating water, BFA, LFA and standard sand. In the second variant, a mixture called ZK1z10 was created on the basis of ZK1, and presoaked with water zeolite was added to it in order to obtain better rheological and metal-binding properties, and so that it did not absorb the water activating blast furnace slag. The third mixture, called ZK1z10nc, was created on the basis of ZK1, to which zeolite soaked in a NitCal solution was added. The nitrogen and calcium ions absorbed by the zeolite, after mixing with other binder components, were to be exchanged for metal ions in the mixture, which would create an even more ecological binder due to their immobilization, and the released calcium was supposed to participate in pozzolanic reactions.

Mixes of slag-ash mortars of 3 series, in grams.

Mixes of slag-ash mortars of 3 series, in percentage by mass.

The method of obtaining the mortars was that after 5 min of mixing the GGBFS with the activating water, BFA and LFS were added. After another 5 min of continuous mixing, zeolite paste was added, which had been prepared at least 2 days earlier from zeolite and distilled water or from the zeolite and NitCal solution (Table 5 and Table 6). The whole mixture was mixed mechanically for 15 min until a homogeneous consistency was obtained. The mixes were poured into metal molds, thickened by hand as consistency allowed, and covered. The settling bars of 4 cm × 4 cm × 16 cm, covered with foil, were disassembled after 3 days and placed in cardboard containers without subjecting them to wet curing. For comparison purposes one series of specimens were immersed, after demolding in a specialized tub for this purpose. The curing temperature was 20 ± 2 °C, pH: 12. Ground zeolite was added in an amount of 5% of binder (without sand) to improve the workability and plasticity of concrete, and due to the CaO content, the zeolite activates pozzolanic reactions, which can shorten the relatively long setting time of the GGBFS. The zeolite was soaked with water, in an amount corresponding to its water demand.

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