Topic
Calcium aluminates
About: Calcium aluminates is a research topic. Over the lifetime, 490 publications have been published within this topic receiving 9200 citations.
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27 May 2018
TL;DR: In this article, an experimental study on the stabilization of a marine soft clay using the blend of two industry by-products: ground granulated blastfurnace slag (GGBS) activated by carbide slag was presented.
Abstract: Stabilization using Portland cement (PC) is one of the most widely used soft clay treatment methods. However, there are significant environmental impacts associated with the production of PC in terms of high energy consumption and non-renewable resources, as well as CO2 emissions. Some industry by-products/wastes have potentials to be applied in soil stabilization. This paper presents an experimental study on the stabilization of a marine soft clay using the blend of two industry by-products: ground granulated blastfurnace slag (GGBS) activated by carbide slag (CS). The testing program involved unconfined compressive strength test, X-ray diffraction, and scanning electron microscopy. The results indicated that both CS-GGBS-stabilized and PC-stabilized clays had similar types of hydration products, including calcium silicate hydrates, calcium aluminates, hydrocalumite, and ettringite. However, the highest strength of CS-GGBS-stabilized clay was 1.5–3 times greater than that measured for PC-stabilized clay. The optimum CS/GGBS mass ratio varied from 0.2 to 0.3 for stabilized clay at different curing age and GGBS content.
TL;DR: In this article, near-surface voids on a cement concrete sample were successfully sealed by applying a metal-ethylenediaminetetraacetic (EDTA) acid complex solution, followed by treatment with high-heat hydrogen/oxygen (H2-O2) coupled flame.
Patent•
17 Nov 2004
TL;DR: In this article, the authors proposed a method for arranging the coating mass as a coating material, where the main binder consisted of 1-3 w-% of dry magnesium sulphate, and auxiliary binder consisting of hexametaphosphate, calcium silicates, calcium aluminates, anhydrous calcium sulphate and/or resin.
Abstract: not available for EP1685078Abstract of corresponding document: WO2005049526The invention relates to a coating mass to be used as a coating material for coating the surfaces of vessels that come in contact with molten metal, the coating mass containing a dry matter composition containing a fire-resistant aggregate mixture and a binder, and water which has been added to the dry matter composition when applying the coating material. According to the invention, the coating mass contains less than 10 w-% of water calculated from the weight of the coating mass, and that the dry matter composition mainly consists of non-organic components and the dry matter composition contains, calculated from the weight of the dry matter composition, as the main binder 1-3 w-% of dry magnesium sulphate, less than 7 w-% of auxiliary binders, which contain hexametaphosphate, calcium silicates, calcium aluminates, anhydrous calcium sulphate and/or resin, less than 6 w-% of cyanite as an additive, and 85-93 w-% of non-organic aggregate or an aggregate mixture. Further, the invention relates to a method for arranging the coating mass as a coating material.
TL;DR: In this article, the effect of manganese dioxide on the formation of calcium monoaluminate in the CaO-Al2O3 system during solid-state sintering of five oxide mixtures corresponding to the known calcium aluminates at temperatures from 1100 to 1400°C was studied.
Abstract: We have studied the effect of manganese dioxide (5–20 wt %) on the formation of calcium monoaluminate in the CaO-Al2O3 system during solid-state sintering of five oxide mixtures corresponding to the known calcium aluminates at temperatures from 1100 to 1400°C. X-ray diffraction examination indicated the formation of calcium manganates. The mixture of the calcium manganates melts at 1330°C, promoting the sintering process and the reaction between the calcium oxide and alumina and raising the yield of calcium monoaluminate as the dominant phase. The calcium manganates are shown to be nonreactive with the forming calcium aluminates. The X-ray diffraction results are supported by scanning electron microscopy data for a number of samples.
TL;DR: In this article, the transformation of Al2O3 inclusions with slag-metal reaction was studied by controlling ladle slag and relative technologies in LF-RH refining process.
Abstract: For high grade pipeline steel, elimination of Al2O3 inclusions can improve the susceptibility of hydrogen-induced cracking (HIC) and stress corrosion cracking (SCC). In the present work, the transformation of Al2O3 inclusions with slag-metal reaction was studied by controlling ladle slag and relative technologies in LF-RH refining process. It is found that Al2O3 inclusions decrease with increasing refining time, and no pure Al2O3 inclusions exist in molten steel at the end of secondary refining; the remained inclusions in molten steel are liquid calcium aluminates and semi-liquid CaO-MgO-Al2O3 complex inclusions. The analysis of thermodynamic equilibrium proves that CaO and MgO in slag can be reduced by aluminum in molten steel, which is the source of calcium and magnesium in molten steel.