The sustainability goals of the developing world have led many industries to recycle their wastes and reduce emitting greenhouse gases. To contribute these environmental responsibilities, this study has focused on development eco-friendly binder materials from regional ground tuff marble by activation Na2SiO3 NaOH or slaked lime (Ca(OH)2). results show that alkali-activated composites tend expa...

A new strategy for determining thermodynamic effective molarities (EM) for macrocylisation reactions using dynamic combinatorial chemistry under dilute conditions is presented. At low concentrations, below the critical value, Dynamic Libraries (DLs) of bifunctional building blocks contain only cyclic species, so it is not possible to quantify the equilibria between linear and cyclic species. Ho...

The range of inorganic acid normalities for maximum color formation of the phosphomolybdenum-blue complex (under heating) increases by elevating the ammonium molybdate concentra­ tion, and at a ratio of molybdate molarity/acid normality equal to 10, there is maximum color development at any acid normality in the range 1—4 n with either HC104 or H2S04 (or their mixtures). On the basis of these f...

Dialysis rates of cholesterol, calcium chloride dihydrate and of their mixture in 90% aqueous dioxane through Visking cellulose membrane were characterized by half-escape times (t1/2) of 2.2, 1.0 and 10.5 hours, respectively. Slow dialysis rate observed with the mixture was due to complex formation between four molecules of cholesterol and two molecules of calcium chloride dihydrate, molecular ...

The impact of calcium hydroxide as an additive in sodium hydroxide- and silicate-activated metakaolin pastes is presented with a primary aim to ascertain the specific effects on reaction kinetics phase formation. FTIR XRD are employed understand interaction (10 wt% replacement metakaolin) 1, 5 10 M NaOH-activated (and equivalent molarity Na2SiO3-activated pastes), focus its nanoscale properties...

The production of Portland cement is energy-intensive and polluting. As a result, the search for ecological economical alternatives has become global priority. Geopolymers are among most promising to cement. Their properties depend on nature concentration activators. This study investigates effect Na2SiO3/NaOH ratio NaOH molarity alkaline activation natural volcanic pozzolan. physico-mechanical...