A hydroceramic waste form is designed specifically to solidify and isolate sodium bearing waste (SBW) in storage at various U.S. Department of Energy (DOE) sites. The acidic waste produced during reprocessing of fuel rods was over-neutralized with sodium hydroxide (NaOH) and stored in underground tanks at DOE’s Hanford and Savannah River sites. Concentrations of NaOH in the SBW can range from 4...

Cement production is one of the most important industries on planet, and humans have relied use dating back to dawn civilization. manufacturing has increased at an exponential rate, reaching 3 billion metric tons in 2015, representing a 6.3% annual growth rate accounting for around 5–8% global carbon dioxide (CO2) emissions. Geopolymer materials, which are inorganic polymers made from wide rang...

Due to their lower energy demand, alkali-activated materials or geopolymers (GPs) are strong candidates replace ordinary Portland cement binders in some applications. The present article attempts investigate the possibility of incorporating plastics waste place silica sand filler GP mortars. compressive strength, density, FTIR, XRD, BET and SEM prepared mortars were evaluated. Satisfactory stre...

Cement solidification is a main technique for radioactive waste treatment to reduce its risk the environment and human health. However, this method underperforms when dealing with spent ion-exchange resin, taking much space, costing money final disposal. In work, simulated resin was solidified using metakaolin-reinforced sulfoaluminate cement system, which optimized by mixture design based on e...

Green mortar is a that environmentally friendly and uses waste materials or by-products to reduce CO2 emissions are produced during cement production. This study aims produce new type of green by using ternary mixes with acceptable fresh hardened properties. The used were metakaolin (10-20%), slag (15-30%), fly ash (10-20%). experimental work was divided into two steps. Firstly, replaced variou...

this study assesses the kinetics of hydration of pulverised fuel ash and metakaolin cement pastes and compares how the rate of reaction affects the pore-characteristics and resistance to ionic ingress. the degrees of hydration for the different mixtures were evaluated, both as a function of the calcium hydroxide content and with respect to the chemically combined water contents. the reaction ra...

Abstract Alkali-activated slag-metakaolin (AASM) has a lower shrinkage than alkali-activated slag, but its complex behaviour remains elusive. In this paper, resistivity measurements were used to monitor the early chemical and autogenous evolution of AASM (containing 10%, 30%, 50%, or 70% metakaolin). The MK content greatly affected development AASM, specimens with 50% showed lowest 49%. presenc...

This paper investigates how the composition of Portland composite cements affects their chloride-binding properties. Hydrated cement pastes prepared with a reference and containing metakaolin and/or silica fume were exposed to NaCl or CaCl2 solutions. Chloride-binding isotherms determined hydrate assemblage was investigated using TGA, XRD, 27Al NMR, 29Si NMR thermodynamic modelling. Compared pa...

The incorporation of pozzolanic materials in concrete construction is progressively increasing. This due to technological advancement and climate change problems associated with carbon emissions resulting from the large-scale manufacturing cement its usage for production. In this study, metakaolin obtained was used partially substitute metakaolin-concrete. Calcination temperatures kaolin were v...