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1 2005

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The synthesis of hydrosodalite and its use in mortar technology

Sasnauskas V., Palubinskaite D.

Materials Science Poland

2005

Vol. 23, No. 3

793--801

The conditions of low-temperature hydrothermal synthesis of zeolites from AlF3 production waste technogenic silicagel polluted with admixtures of fluorides, were analyzed. It was determined that AlF3 admixture encourages the formation of hydrosodalite. When using technogenic silica gel, crystal zeolite hydrosodalite was synthetized. The reaction was conducted under hydrothermal conditions, under atmospheric pressure at 90oC temperature for 0.5, 1 and 2 hours. The best molar ratio of the components Na2O : Al2O3 : SiO2 : H2O was 2 : 0,02 : 1 : 10. Lignosulphonic plasticiser (LST) was modified with synthetized hydrosodalite. The binding duration of cement paste of normal consistence with modified LST plasticiser decreased up to 40/395 min. (at 0.25% content of admixture) and 80/150 min. (0.75%), as compared with that of mortar non-modified with LST plasticiser, where the binding duration was equal to 65/475 min. (0.25 %) and 105/150 min. (0.75%). Larger compression strength of cement grout with modified LST plasticiser after 3, 7 and 28 days of hardening was obtained: 12.61; 21.52; 25.49 MPa (at 0.25 % content of addition), as while that mortar with nonmodified LST plasticiser 6.04; 9.63; 22.69 MPa compression strengths of specimen, respectively.