Abstract Ferrous iron–based degradative solidification and stabilization is a modification of conventional solidification and stabilization in which organic compounds are destroyed while inorganic compounds are immobilized. The effect of using different sources of Portland cement (PC) (i.e., CPC, TPC, LPC, QPC) on degradation of …

Carbon dioxide (CO 2) emissions from the cement industry account for 26% of the total industrial emissions, and the need to develop low-carbon techniques within the cement industry is extremely urgent.Low-carbon projects and technologies for the cement industry in different regions and countries have been thoroughly reviewed in this manuscript, and …

cement, in general, adhesive substances of all kinds, but, in a narrower sense, the binding materials used in building and civil engineering construction. Cements of this …

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From the above Eqs. and (), both the aqueous solubility and dissolution behavior of the particular form of gypsum are significantAs gypsum dissolves in water, the SO 4 2− and Ca 2+ ions present in the solution will react with C 3 A and Ca 2 AlFeO 5 to form ettringite [].The formation of ettringite depends on the dissolution rate of gypsum. …

AbstractSeveral studies have been carried out to find out the reactive species in cement/Fe(II) system for the treatment of ground water contaminated with a number of chlorinated organic pollutants such as trichloroethylene (TCE). The previous studies suggest that cement hydration minerals associated with sulfate could be one of the reactive …

An open-cell metallic foam was employed as an analogue material for human trabecular bone to interface with polymethyl methacrylate (PMMA) bone cement to produce composite foam–cement interface specimens. The stress-displacement curves of the specimens were obtained experimentally under tension, shear, mixed tension and shear …

Raw materials chemistry. Cement manufacture requires a source of calcium, such as CaCO 3 or CaMg (CO 3) 2, which comprises almost 80–90% of the total and the rest is iron oxide (Fe 2 O 3, Fe 3 O 4), quartz (SiO 2), and clay/bauxite (Al-silicates) (Aïtcin and Flatt Citation 2015; Hewlett Citation 2003; Peray and Waddell Citation 1986).Traces of Na 2 O, K 2 O, …

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No. 3-2008 (Volume 61) 53 New chromium reducing agent for cement Matteo Magistri, Potito D'Arcangelo Mapei S.p.A., Milan/Italy Summary: The raw material for Portland cement manufacturing may contain chromium. A very promising and innovative class of

In DGR applications, the fate of ferrous and ferric iron at the interface between iron/steel and the adjacent medium, such as clay and nuclear waste glasses, has been extensively studied with the aim of assessing the long-term performance of the engineered barrier materials as a result of iron/steel corrosion [77,78,79,80,81,82].In contrast, there …

Table 2 lists the mixing proportions of MOS cement used in this study, and the MFS-0 sample represents the control sample. To obtain MOS cement with high strength, the molar ratios of a-MgO/MgSO 4 and H 2 O/MgSO 4 were always in the range of 7–12 and 19–22, respectively [37, 38].Therefore, these used in this study were equal to 9.5 and 20, …

Although the growth time for 5 Mg (OH) 2 ·MgSO 4 ·7H 2O was extended after adding ferric sulfate, the content and crystallinity of 5 Mg (OH)2 ·MgSO 4 ·7H 2 O were increased, improving the mechanical strength and volume stability of MOS cement. The formation of Fe (OH) 3 gel in MOS cement densified the matrix and optimized the pore …

The leaching characteristics of seven different recycled concrete aggregates (RCA) samples derived from building demolition waste, concrete pavement, stockpiled, and freshly crushed concrete were evaluated focusing on the effects of carbonation, liquid-to-solid ratio (L/S), and particle sizes.

The crystal structure of the three main Fe-containing AFm phases (Al2O3-Fe2O3-mono: family of lamellar calcium alumina-ferrite hydrates) encountered in cement hydration process are characterized and compared with their Al-analogs. This includes AFm phases containing sulfate (which is present in Portland cement to regulate the hydration …

The cement industry confronts significant challenges in raw materials, energy demands, and CO2 emissions reduction, which are global and local environmental concerns. Life cycle assessment (LCA) has …

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FTIR spectroscopy was conducted to analyze the chemical groups and bonds of catalysts. As shown in Fig. 1 (B), the broad and strong peaks at 3396 cm −1 represented the stretching vibrations of the H-bond in surface –OH groups [20].The peaks at 1630 cm −1 belonged to the bending vibration of O—H derived from interlayer water [24].The …

Abstract. In this review, steel slag usage in the cement and concrete industry and its environmental effects were examined. Also, its physical and chemical structure, its effect on the ...

Manufacturing of cement composites with magnetite nanoparticles (MN) covers preparation of the nanomodifier as well as the remaining components of the composite (cement, water, possible chemical admixtures, and additions) and their processing (e.g., mixing/dispersing, molding, and curing), as shown in Figure 6.

Experiments were conducted to investigate the reductive dechlorination of tetrachloroethylene (PCE) by nano-Mackinawite (nFeS) with cyano-cobalamin (Cbl(III)) in cement slurries. Almost complete degradation of PCE by nFeS-Cbl(III) was observed in cement slurries in 5 h and its degradation kinetics (k obs-PCE = 0.57 h −1) was 6-times …

Cement-based materials are widely used in the world thanks to their low price, reliable mechanical properties and high versatility [].However, the production of cement consumes a large amount of raw materials and energy generating up to 5–7% of the global carbon dioxide (CO 2) due to human activity [].Considering this, calcium …

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PDF | Abstrak Composite materials for X-ray shield aplications have been synthesized used the ordinary portland cement (OPC) as matrix material and Fe 2... | Find, read and cite all the research ...

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The main features of these cement ingredients along with their functions and usefulness or harmfulness are given below: Lime: Lime is calcium oxide or calcium hydroxide. The presence of lime in a sufficient quantity is …

A szomszédos Ausztria és Németország mellett a délnyugat-európai országok, Spanyolország és Portugália is nagy népszerűségnek örvendenek a költözni vágyók körében. Pontos számok nem állnak rendelkezésre, de a statisztikai hivatalok (KSH, Eurostat) adatai szerint Spanyolországban 9039, Portugáliában pedig 480 magyar él.

1/4 Cements The first calcium silicate cements were produced by the Greeks and Romans, who discovered that volcanic ash, if finely ground and mixed with lime and water, produced

Iron is one of the trace elements required by human body, and its deficiency can lead to abnormal bone metabolism. In this study, the effect of iron ions on the properties of tricalcium silicate bone cement (Fe/C3Ss) was investigated. It effectively solved the problems of high pH value and low biological activity of calcium silicate bone cement. …