Abstract
The effects of individual or combined addition of sodium water glass (SWG), calcite and CaCl 2 into the starting material, consisting of 92 wt.% of Portland cement with sand and 8 wt.% of cellulose fibers, were studied after autoclaving. Bending strength, bending toughness and module of elasticity were determined. The optimal additions were either 26 wt.% of SWG and 10 wt.% of calcite (sample No. 4) or 5 wt.% of CaCl 2 (sample No. 2). Autoclaved products were also investigated by X-ray diffraction (XRD), mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM). All results were compared to the product obtained without additions.
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