Hydration Kinetics of a Low Carbon Cementitious Material Produced by Physico-Chemical Activation of High Calcium Fly Ash

Abstract

The hydration kinetics of a ternary system containing high lime fly ash activated with alkali sulphate rich fly ash has been studied. The effect of low intensive mechanical activation of fly ashes influencing the particle packing and water demand was undertaken. A ternary blend of fly ashes and silica fume was found to show improved bond strength between the binder paste and aggregate rather than the binder paste matrix with progressive hydration after 90 days. Analogous physico-chemical properties of the developed ternary blend with the control cement were revealed. Quick dissolution of K + , Na + and SO 4 2-into the liquid phase as well as consumption of Ca 2+ by silica fume in a high-pH environment were the predominant factors for producing a dense non-expansive hydration product by the ternary blend.

High performance cold asphalt concrete mixture for binder course using alkali-activated binary blended cementitious filler

“…Chemical analysis of the chosen filler materials, %.Table 1illustrates the high calcium content of the HCFA used, showing a good ratio of SiO2 and Al2O3.These outcomes are consistent with those of Sadique and Al-Nageim[33]; however, the reported quantity of CaO in the current research is higher. The main oxides in the FC3R are Al2O3 and SiO2, this in agreement with the results of Mas et al[26], Mármol et al[34].…”

A Sustainable Cold Mix Asphalt Mixture Comprising Paper Sludge Ash and Cement Kiln Dust

“…The presence of alkali ions, supplied by CKD, accelerated the dissolution of PSA and formed the hydration products, primarily the ettringite (Figure 9). A similar hydration mechanism was reported by Sadique et al [55] during the activation of high calcium fly ash with alkali sulfate-rich fly ash and Chaunsali and Peethamparan [56] for the CKD-GGBS system. The progressive formation of hydration products within the developed cold mix system containing the binary blend and consequently increasing ITSM as shown in Figures 5 and 6 was due to the increased activation of the PSA by the calcium and sulfur trioxide content of CKD as per the findings by Sadique and Coakley [57].…”

Improving Soft Subgrade Stability Using a Novel Sustainable Activated Binder Derived from By-Products

“…It can be seen the presence of C, O and Ca, Si, and Al and traces of K, S, Mg, and Fe. The calcium content of the C-S-H gel is indicative of the stability and density of the cementitious product, according to Sadique and Al-Nageim (2012). The findings show that the Ca concentration was high, leading to a stable C-S-H gel.…”