Blended Cement Systems with Zeolitized Silica Fume

Abstract

In this paper the properties and the hydration of Portland cement pastes containing zeolitized silica fume were studied. Hydrosodalite was obtained by zeolitization of silica fume. XRD, DSC, SEM and energy-dispersive X-ray spectroscopy were used as investigation methods. The compressive strength of hardened cement paste was measured after 28 days. The levels of cement replacement by additives were 5 %, 10 % and 15 % by weight in the specimens. Changes in the strength of hardened cement paste were observed. The influence of additives on hydration rate and hydration temperature was also observed. Both 1Hs (hydrosodalite) and 2Hs (modified hydrosodalite) additives accelerate the hydration of the cement paste. The highest hydration temperature was achieved in a mixture with 5 wt. % 1Hs additive and with 10 wt. % 2Hs additive. The microstructure of hardened cement paste specimens with 1Hs and 2Hs additive is denser compared with reference specimens without the additives. The maximum compressive strength of the specimens with 10 wt. % of 2Hs reached up to 101 MPa under laboratory conditions.

Gospodarka Surowcami Mineralnymi - Mineral Resources Management

“…6A and 6B). The content ranges of these chemical compo- nents for zeolite na-lSX and hydrosodalite are marked schematically on the base of literature data (Vaičiukynienė et al 2012;rui et al 2016;Vaičiukynienė et al 2016;yao et al 2018). Practically none of the tested grains in these systems is in the field corresponding to the Na-LsX type zeolite, while in the hydrosodalite field there are only a dozen grains out of all 101 ones tested (Table 4).…”

Utilization of ceramic waste powder and rice husk ash as a partial replacement of cement in concrete

“…Among the elements of the concrete, a crucial one is the cement that imparts strength as a binding agent and is the most expensive one [5]. Various researchers around the world started studying the alternate materials that can substitute this binding agent [6][7][8]. The huge quantities of the solid waste generated requires disposal which otherwise adversely affects the environment [7,9].…”