Abstract Nano-SiO 2 is a non-toxic, tasteless, and pollution-free material with hydroxyl groups that facilitate the adsorption of water on its surface. characterized by small particle size, high purity, low density, large surface area, good dispersion properties. In addition, nano-SiO has excellent stability, reinforcement, thixotropy, optical mechanical The additive can enhance properties micr...

Abstract The treatment of tannery wastewaters is a complex task due to the complexity waste: mixture several pollutants, both anionic and cationic as well organic macromolecules which are very hard treat for disposal all together. Geopolymers class inorganic binders obtained by alkali activation aluminosilicate powders at room temperature. Such process leads cement like matrix that drastically ...

This study investigated the feasibility of synthesizing sodium silicate from rice husk ash (RHA) and its application to produce geopolymers. Samples were prepared at different SiO2/Al2O3 molar ratios (3.0, 3.5, 4.0) for both silicates (commercial RHA). They underwater cured 60 ºC 1 h then room temperature (25 in air) until time tests (7 28 days). The results showed that compressive strength sig...

In this paper, we report the results of our investigation on the possibility of producing foam concrete by using a geopolymer system. Class C fly ash was mixed with an alkaline activator solution (a mixture of sodium silicate and NaOH), and foam was added to the geopolymeric mixture to produce lightweight concrete. The NaOH solution was prepared by dilute NaOH pellets with distilled water. The ...