Some world-wide research, especially in the last decade, pointed out the possibility to use the crushed glass wastes – cullets and fibers – in concrete, as partial replacement for the corresponding size ranges of the aggregate or as pozzolanic material – for finely ground glass. Although the volume of the data is limited, some of them assert the pozzolanic behavior of very fine glass powder in blended cements. The ground glass having certain grain size characteristics, can also replace the fine aggregate in concrete.
The present paper brings some data obtained by own researches concerning the pozzolanic behavior of the fine glass powder in blended cements. The pozzolanic reactivity was determined by its capacity to react with Ca(OH)2.
Some blended cements containing 10-40% E glass powder were prepared and characterized, in comparison with cements containing the same amount of fly ash. The blended cements were characterized from the point of view of the main properties – setting time and mechanical strengths developed after 2-60 days of hardening. Investigations concerning the hydration processes were carried out too, using X-ray diffraction analysis and thermogravimetric analysis for binder pastes after 7 and 28 days of hardening.