Potassium fertilizer via hydrothermal alteration of K-feldspar ore

Investigation on the formation of tobermorite in calcium silicate board and its influence factors under autoclaved curing

There is a concerted effort worldwide to use environment-friendly binders in the establishment of civil infrastructure. The use of such materials, as a partial or total replacement of Portland cement, leads to technical, economic and environmental benefits. The reported study was conducted to develop high performance concrete (HPC) utilizing two industrial waste materials (IWMs), namely cement kiln dust (CKD) and electric arc furnace dust (EAFD), in conjunction with nano-silica (NS). The mechanical properties, morphology and durability characteristics of the developed HPC were evaluated. The strength of concrete decreased with increasing quantity of both CKD and EAFD that were used as a partial replacement of cement. However, an increase in strength was noted due to the incorporation of NS. The chloride permeability significantly decreased due to the incorporation of 5% NS in CKD and EAFD cement concretes. A dense and uniform microstructure, with a compact interfacial transition zone, was noted in concrete specimens incorporating Portland cement, IWMs and NS. The incorporation of IWMs along with NS results in the following benefits: environmental (decreased greenhouse gas emission and solution of the disposal problem associated with the IWMs), economic (decreased overall cost of concrete) and technical (enhanced service life of structures).

Development of high performance concrete using industrial waste materials and nano-silica

Micro-nanostructures of tobermorite hydrothermal-synthesized from fly ash and municipal solid waste incineration fly ash

Influence of hydrothermal treatment on the mechanical and environmental performances of mortars including MSWI bottom ash

Tobermorite synthesis under hydrothermal conditions

This paper deals with the mechanical properties and phase study of alkali activated blast furnace slag and by-pass cement kiln dust mixture. The by-pass cement kiln dust (CKD) solves the problem with significant shrinkage of alkali activated materials which is considerably limiting their practical applications. The mechanism of action of CKD in alkali activated matrix has been investigated as well as its optimal dosage in the means of mechanical properties. The reaction products during the hydration process were characterized by X-ray powder diffraction.

Eva Štěpánková

Papers

Tobermorite synthesis under hydrothermal conditions

Utilization of By-Pass Cement Kiln Dust in Alkali-Activated Materials

Image Permanence Evaluation by Color Gamut Volume Changes