Abstract
In this investigation the influence of CSH-phase nuclei on the CaO-SiO 2-H 2O hydrothermal reaction was studied. CaO-SiO 2-H 2O mixes ( C S = 0.11 ) were hydrothermally treated at 10 atm. of saturated steam with the addition of CSH-phase nuclei. The source of C-S-H-nuclei was ground waste sand-lime (WSL) products. WSL was added in amounts from 0 to 40% by weight of the total mix and in different surface areas. Hydration kinetic studies and physico-chemical tests were done on the hydrothermally-hardened specimens at different times of autoclaving. The modes of the hydrothermal reaction between silica, lime and WSL were fully discussed and related to the developed compressive strength of the final autoclaved samples. The results indicated that the CSH-phases in the WSL accelerated the nucleation period of the reaction between quartz and lime. The on the seeds crystals formed and later accumulated tobermorite Ca 5(OH) 2Si 6O 16 · 4H 2O, as this represented the main hydration product it caused higher strength values for these autoclaved products. The role of CSH-phase nucleation as a decisive factor in CaO-SiO 2 hydrothermal reaction has been demonstrated.
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