The ultimate strength of specimens occurred in the specimen of fly ash A in this study. The activity index on Day 28 of fly ash A was only 117%, and the amorphous form was the lowest among the three raw materials, indicating the activity index and amorphous content are not in absolute relation to AAM strength.
Highlights We studied the effects of aging on the sorptivity of rice straw biochar and fly ash. Increasing the aging periods and temperature reduced their sorptivity. Rice straw biochar's sorptivity was greater than fly ash's, regardless aged or not. Rice straw biochar is a good functional material for controlling organic pollutants.
Conversely, the sole addition of MEA primarily influenced the pore structure in the specimen aged 90 days by enlarging the larger pore segment (greater than 100 nm). ... The role of pozzolanic activity of Siliceous fly ash in the formation of the structure of sustainable cementitious composites. Sustainable Chemistry, 3 (4) (2022), pp. 520-534.
abstract = "This study focused on characterizing the carbonation behavior of 90-day aged alkali-activated fly ash/slag blended by MgO. Effects of MgO reactivity on the carbonation behavior of the synthesized binders were explored. A 0.3% CO2 concentration was adopted for an accelerated carbonation environment. The samples were characterized ...
A mixture of coal bottom ash and slag, with a fraction of fly ash (CAFAS) from steam locomotives, was placed in the cave Divaška jama to delimit and level tourist trails. Emplacement began in 1914 and carried on for several decades. The CAFAS mixed with other cave material gradually changed its structure and appearance.
The fundamental mechanistic approach is the charge involvement of the mullite phase for the bactericidal activity of fly ash, which is explored with the help of phenol and substituted phenols. 51 The charge augmentation occurs at the interacting site of bacteria in the organic molecule by appropriate functional group substitution. The ...
Fly ash M M M Q M M Q Q Q Q Q Q MeFig. 1 XRD patterns of raw slag and y ash. The annotations indicate:anhydrite, Me melilite, Q quartz, M mullite Table 2 Design of the samples Specimen Slag/Fly ash (wt%) MgO/(y ash + −slag) (wt%) MgO reactivity Modulus of alkali activator OH concentration of alkali activator (mol/L) M6-5 0.4 0.1 6 1.0 ...
When fly ash content in the cured soil F1 is 0 %, its strength is mainly provided by the alkaline activation of aeolian sand to generate gel substances. After one freeze-thaw cycle, the unconfined compressive strength of cured soil F1 decreases by 23.64 %, and after seven cycles, it declines by 80 %.
S/S use additives or binders in order to immobilize physically and/or chemically hazardous components initially present in waste (Wiles, 1996).Six waste types contaminated with heavy metals can be handled by S/S: fines grained soil (clay and sites), coarse grained soils, metal sludges, nitrate salts from processing operations, chlorides salts from off-gas treatment, …
Incineration fly ash (IFA) and incineration bottom ash are secondary wastes generated by MSW incineration (Huber et al., ... Furthermore, this process often coincides with the formation of secondary minerals, enhancing the mineral activity of IFA (Kitamura et al., 2015). Download: Download high-res image (833KB)
Assessment of Pozzolonic activity of certain industrial waste is important due to an increasing need of cementitious material.This study was undertaken to widen the scope of using pozzolanic waste like fly ash and bagasse ash as a supplement to cement. Sugarcane bagasse ash (BA) is a solid waste obtained from the cogeneration combustion boilers in sugar industry …
This study focused on characterizing the carbonation behavior of 90-day aged alkali-activated fly ash/slag blended by MgO. Effects of MgO reactivity on the carbonation behavior of the synthesized binders were explored. A 0.3% CO2 concentration was adopted for an accelerated carbonation environment. The samples were characterized using compressive …
Concentrations of Cu in aged fly ash samples are 50–100 times higher than concentrations of fresh fly ash samples at pH ... Calculated log activities of the elements of interest obtained from MINTEQA2 and their corresponding leachate pH were graphed. These graphs were used to determine elements of interest that were controlled by mineral ...
Fly ash and microbial activity 133 Fig. 3. 1.5 0% ~-~ 3% 12% 1.0 0.5 i I~ I i i 10 20 30 40 days The rates of carbon dioxide evolved at various treatments of fly ash on the sandy loam. increase was observed after 10 days of incubation for 3 % ash-amended sandy soils, whilst only a slight increase in carbon dioxide evolution was recorded for the ...
the pozzolanic activity of binders fly ash, GGBS, mica powder and pumice powder has been determined for their use in geopolymer mortar either individually or in combination of one or two binders. 2 Experimental 2.1 Materials 2.1.1 Cement: Ordinary Portland Cement 43 grade is used in the current study. The properties of cement are
Activate the potential activity is the main purpose of the study about the pozzolanic properties of fly ash.In order to eliminate the affection of Ca 2+,NaOH,NaCl,Na 2 SO 4 were used as activator ...
The Si dissolution activation energy of ground fly ash is about 78 kJ/mol, while the dissolution activation energy of ordinary fly ash is about 50–59 kJ/mol. This indicates that grinding greatly affects the solubility activity of fly ash Si than Al. This may due to the exposure of the amorphous phase inside the fly ash.
Fly ash can undergo aging in the atmosphere through interactions with sulfuric acid and water. These reactions could result in chemical and physical changes that could affect the cloud condensation or ice nucleation activity of fly ash …
Characterization of naturally aged cement-solidified MSWI fly ash Bing Du, Jiantao Li, Wen Fang, Yili Liu, Shuyao Yu, Yu Li, Jianguo Liu⇑ Key Laboratory for Solid Waste Management and Environment Safety, School of Environment, Tsinghua University, Beijing, PR China article info Article history: Received 17 June 2018 Revised 30 August 2018
A large difference in Pb leaching was observed: the cumulative leaching amount of GT fly ash (707.59–3072.36 mg/kg) was an order of magnitude higher than that of CFB fly ash (22.47–407.314 mg ...
Also, fly ash is used widely for various civil engineering applications, that is fly ash bricks, hollow cement blocks, tiles, road construction, and various types of concrete materials.
Using industrial waste as part of the raw material to produce cement-based materials is considered to be a sustainable cement and concrete materials production method. Coal …
Fly ash (FA) is a typical aluminosilicate solid waste, and it has been intensively studied as a precursor for the preparation of geopolymers because it is widely available globally and has a relatively consistent chemical composition (Turner and Collins, 2013, Scrivener et al., 2018).However, the massive production and application of FA-based geopolymers are still …
Nature of fly ash amendments differently influences oxidative stress alleviation in four forest tree species and metal trace element phytostabilization in aged contaminated soil: A long-term field experiment ... 8-OHdG, glutathione contents, SOD and PO activities between non-amended and coal fly ash amended groups were performed using a two-way ...
They also exhibit biological activities including antimitotic, antimalarial, anticancer and anti-inflammatory activity [13]. Fly ash, an abundant, aluminosilicate, by-product of ... up to pH 8 in the above mixture. The resultant slurry was aged for 24 h, then filtered and washed with double distilled water up to pH 7 to remove leached compounds ...
The particle size distribution of fly ash determined by laser diffraction was shown in Fig. 1 (b), and the XRD pattern of the fly ash was presented in Fig. 2 (b). Fly ash consists of crystalline and amorphous phases, with the main crystalline phases being mullite, quartz, and hematite. The SEM image of the fly ash is shown in Fig. 3 (b). It ...
This research investigates the effects of ageing and maturation of solidified/stabilized mixtures of contaminated sediment with fly ash and lime.
In this study, the effects of silicate modulus of activators (Ms) on carbonation of alkali-activated slag/fly ash cements are studied and compared between natural (0.03–0.04% CO 2) and accelerated (1% CO 2) carbonation conditions, via XRD, FTIR and TG/DTG techniques.Carbonation results in the decalcification of the C-A-S-H gels and the formation of …
Fly ash-based geopolymer mortar (GFM) was used as an adsorbent material to methylene blue () and also the dye removal material using the photocatalytic mechanism. The GFM, containing 50 wt% river sand aggregate, was prepared to have approximately 46% open porosity, pore size distribution between 0.01 and 3.5 mm, and water permeability of ...
In this paper a comprehensive experimental investigation on the residual bond strength between the early aged fly ash concrete and steel ribbed bar after exposed to high temperature has …
Affiliations 1 Key Laboratory for Solid Waste Management and Environment Safety, School of Environment, Tsinghua University, Beijing, PR China.; 2 Key Laboratory for Solid Waste Management and Environment Safety, School of Environment, Tsinghua University, Beijing, PR China. Electronic address: [email protected].