Supplementary cementitious materials (SCM) are used in concrete to reduce expansion due alkali-silica reaction. However, studies reported higher the field compared that of laboratory samples. This paper investigates effect temperature on alkali release from aggregates, leaching samples, and hydration alkali-binding capacity SCM. Aggregates contribute more alkalis alkaline solutions at temperatu...

Properties of biomass relevant to combustion are briefly reviewed. The compositions of biomass among fuel types are variable, especially with respect to inorganic constituents important to the critical problems of fouling and slagging. Alkali and alkaline earth metals, in combination with other fuel elements such as silica and sulfur, and facilitated by the presence of chlorine, are responsible...

Microparticles containing substantial amounts of radiocesium collected from the ground in Fukushima were investigated mainly by transmission electron microscopy (TEM) and X-ray microanalysis with scanning TEM (STEM). Particles of around 2 μm in diameter are basically silicate glass containing Fe and Zn as transition metals, Cs, Rb and K as alkali ions, and Sn as substantial elements. These elem...

Usage of oil shale produces abundant oil shale residue, which may not only directly cause serious pollution to the environment, but also result in a waste of resource. In this paper, acid leaching method and alkali soluble method were compared to obtain the optimum processing conditions for the preparation of white carbon black, which was determined as follows: the mass fraction of NaOH was 8 %...

In this study, the valorization potential of Polish laterite leaching residues through alkali activation with use NaOH and Na2SiO3 solutions as activators was investigated. The effect main factors, namely H2O/Na2O molar ratio in activating solution, curing temperature, ageing period on properties produced activated materials (AAMs) assessed. experimental results showed that AAMs sufficient comp...

In this research work, thar coal was treated with NaOH solution in dissolved oxygen different reaction parameters an isothermal reactor. All three types of sulfur were removed from through oxidative alkali leaching under pressure. About 90% pyretic sulfur, 78% organic and 50% sulfate removed, more than 82% total removal achieved. Effects various observed, it investigated that time, agitation sp...

Treatment of underground tanks at Hanford with concentrated alkali to improve removal of wastelimiting components of sludges has proven less efficacious for Al and Cr removal than had been hoped. Hence, more aggressive treatments of sludges, including contact with oxidants targeting Cr(III), have been tested in a limited number of samples and found to enhance Cr removal. Unfortunately, treatmen...