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Copyright of Special Steel is the property of Daye Special Steel Co. Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to improve the poor grading, loose overall structure and low strength of silt as subgrade material, the composite curing agent was prepared with red mud (RM), carbide slag (CS) and desulphurized gypsum (DG) as raw materials, and the mix ratio optimization of composite cured soil was carried out in this paper. The reasonable content range of red mud, carbide slag and desulfurized gypsum cured soil was determined by single factor test, and the mix ratio of composite cured soil was optimized by Box-Behnhen response surface method. A second-order regression model was established with 7 and 28 d unconfined compressive strength (UCS) as response values. The results show that the significant degree of influence of single factor on the unconfined compressive strength of cured soil at 7 and 28 d is carbide slag, red mud and desulphurized gypsum. The influences of two factors on the unconfined compressive strength of cured soil at 7 d is in the order of red mud and carbide slag, red mud and desulphurized gypsum, carbide slag and desulphurized gypsum, and the influence on the unconfined compressive strength at 28 d is in the order of red mud and carbide slag, carbide slag desulphurized gypsum, red mud and desulphurized gypsum. The optimal mix ratio of composite cured soil is 15.84% (mass fraction) red mud, 14.32% (mass fraction) carbide slag and 7.32% (mass fraction) desulphurized gypsum. The error range of the measured and predicted response values is controlled within 3%, which proves the accuracy and scientificity of the response surface method in optimizing the mix ratio of composite cured soil. The main products of cured soil are calcium silicate hydrate (C-S-H) and calcium aluminate hydrate (C-A-H) with gelling effect, and the resulting ettringite (AFt) is interspersed between the gel and soil particles to enhance the strength of soil. [ABSTRACT FROM AUTHOR]

Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Refractories / Naihuo Cailiao is the property of Naihuo Cailia (Refractories) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Refractories / Naihuo Cailiao is the property of Naihuo Cailia (Refractories) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to find safe and low-cost salt-activated materials to prepare soil polymers, light burned metakaolin was obtained after firing Guangxi kaolin at 850 °C for 4 h and added with different amounts of condensed aluminum phosphate, lithium phosphate and lithium silicate (3%, 4% and 5% of the metakaolin mass, respectively) as the additives to prepare soil polymers. Subsequently, the mixtures of metakaolin with lithium silicate, lithium phosphate or condensed aluminum phosphate were added to the corundum castable system, respectively, and the performance of the castables was compared with that of calcium aluminate bonded corundum castables. The effects of the additives on the solidification time, phase composition and microstructure of the obtained soil polymers as well as the soil polymers on the properties of the castables were explored. The results show that: (1) the solidification time of the soil polymers increases from 2 h to 5 h with the increasing additive addition, and the preferred addition is 4%; (2) at 20 °C, condensed aluminum phosphate reacts with metakaolin to form gelling SiP2O7, while lithium silicate and lithium phosphate react with metakaolin to form LiAISiO4, forming a layered structure or a gelling film attached to the surface of metakaolin, thus resulting in a gelation effect of soil polymers; (3) at 1 100 °C, soil polymers gradually form mullite, and layered metakaolin becomes thinner and cross connected; at 1 600 °C, the mull-itization of soil polymers is complete, forming needle and rod structures that cross connect with each other, and a small amount of liquid is generated, densifying the sample; (4) replacing calcium aluminate cement with soil polymers in the same proportion as the binder, the castable has a certain gap in performance compared to the calcium aluminate cement bonded castable. [ABSTRACT FROM AUTHOR]

Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to promote the resource utilization of steel slag, based on the stability evaluation of steel slag, using lime as alkali activator, the unconfined compressive strength test, X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to study the effects of different alkali-activated slag mix ratios and alkali-activated slag content on the compressive strength of slag-stabilized steel slag mixture. The hydration products and strength enhancement mechanism of slag-stabilized steel slag mixture was discussed. The research showed that the strength of the mixture increased first and then decreased with the increase of lime content, and the optimal mix ratio of lime and mineral powder was 1 ∶4. 2. Under this mix ratio, the 7 d strength of the mixture with 4. 5% alkali activated mineral powder content reached 6. 27 MPa, which met the technical requirements of high-grade pavement. With the increase of alkali-activated slag content, the compressive strength of the mixture increased, the elastic section of the load-deformation curve increased gradually, the plastic section and the descending section decreased, and the plastic deformation capacity decreased. Lime can better stimulate the potential activity of the slag-steel slag system. The hydration products included hydrated calcium silicate, hydrated calcium aluminate and Jennite. The internal honeycomb and fibrous cementitious structure made the internal structure of the mixture denser and improved the macroscopic strength and volume stability of the mixture. [ABSTRACT FROM AUTHOR]

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Refractories / Naihuo Cailiao is the property of Naihuo Cailia (Refractories) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Refractories / Naihuo Cailiao is the property of Naihuo Cailia (Refractories) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

CO2 mineralization curing is considered an effective approach to mitigate the impact of the construction industry on global climate change by reacting CO2 with cement-based materials (CBM) (e. g. cement clinker, namely tricalcium silicate, β-dicalcium silicate, tricalcium aluminate and its hydration products, namely calcium hydroxide, amorphous calcium silicate hydrates, hydrated aluminate and sulfate phases) to form calcium carbonate mainly composed of calcite and amorphous silica gel with high degree of polymerization, realizing the storage and utilization of CO2. Attributed to the good stability, filling effect and nucleation effect of the resultant products, the mechanical properties and durability of CBM are effectively improved while better performance is anticipated in a relatively short time compared with other curing technologies. In this paper, the reaction mechanisms and latest research progress of CO2 mineral carbonation-cured CBM are reviewed. The effect of influencing factors, such as pre-condition, relative humidity, water binder ratio, CO2 concentration, curing pressure and temperature on the post-mineralization properties, carbon fixation rate and mineralization degree are evaluated. Finally, based on the current research status and existing problems, suggestions and recommendations for a wider application of CO2 mineralization technology in the future are also provided. [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Effect of three commercial reactive alumina micropowders on the properties of alumina based castables was researched using tabular alumina, reactive alumina micropowder and calcium aluminate cement as raw materials. The results indicate that: (1) the CA6 formation is influenced by the impurities content, the particle size and the specific surface area of alumina micropowder; (2) smaller alumina powders with narrow particle size distribution present better fiiling effect in the castables; therefore, samples incorporated with this kind of reactive alumina micropowder present dense microstructure and excellent mechanical properties;(3)the strength of fired castables is also correlated with the sinterability of reactive alumina micropowder; samples added reactive alumina micropowders with similar particle size but larger specific surface area present higher strength. [ABSTRACT FROM AUTHOR]

Lightweight alumina-silica castables were prepared using closed-cell perlite (2-4 mm),open- cell perlite (4-6 mm) and coal gangue ceramsites (≤5 mm) as aggregates, floating beads (0.3 -0.5 mm),sinking beads (0.6 -0.8 mm),silica micropowder, α-Al2O3 micropowder, zirconia and zircon micropowder as fines, and Secar 71 (calcium aluminate cement) cement as the binder. The effects of the coal gangue ceramsites addition (0,6%,12%,18% and 24%,by mass) on the properties of the as-prepared lightweight alumina-silica castables were investigated. The results show that:(1)the addition of coal gangue ceramsites can reduce the sintering shrinkage of the specimens and help) to improve the strength and thermal shock resistance; (2)the specimens with the addition of coal gangue ceramsites can produce pores in the matrix of the sintered specimens, which provides enough space for the growth of CA6 complex solid solution and expands the irregular lamellar structure; (3) with the addition of coal gangue ceramsites increasing, the linear shrinkage of the specimens sintered at 1 000 or 1 200 °C firstly reduces and then increases, the bulk density increases and the apparent porosity decreases; the cold compression strength and the thermal shock resistance of the specimens sintered at 1 200 °C firstly increase and then decrease. Thus, the optimal addition of coal gangue ceramsites is 18%. [ABSTRACT FROM AUTHOR]

Objective In order to explore the feasibility of using shale gas oil-based drilling cuttings pyrolysis residue as sulograde filler, lime and fly ash were used as composite materials for modification. Methods The effects of different mixing ratio and dosages of mineral materials on unconfined compressive strength and leaching characteristics of solidified drilling cuttings were compared. Besides, the study was also conducted to investigate the influence of the incorporation ratio of pyrolysis residue to natural soil on compaction characteristics and CBR value of modified subgrade filler. Results 7-day unconfined compressive strength and CBR value can reach 3.95 MPa and 15.5%, respectively, and leaching characteristics of the solidified oil-based drilling cuttings pyrolysis residue could meet the requirements of GB 8978-1996 Integrated wastewater discharge standard. Conclusions The composite mineral materials themselves and their hydrated products including hydrated calcium silicate gel, hydrated calcium aluminate, calcium hydroxide, and calcium carbonate all have stabilizing effect on heavy metal ions from oil-based drilling cuttings. pyrolysis residue. Therefore, the composite mineral materials could not only densify the structure and enhance the bearing capacity of the solidified oil-based drilling cuttings pyrolysis residure, but also could effectively envelop and adsorb the contaminants so as to inhibit the leaching. Accordingly, the system exhibits good application prospects. [ABSTRACT FROM AUTHOR]

Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The La2O3 doping Ni was prepared by ball-milling method and added into the AI2O3-SiC-C castable specimens as the catalyst, which were prepared using tabular corundum, SiC powder, ball pitch, α-AI2O3 micropowder, SiO2 micropowder, AI-Si alloy powder, and calcium aluminate cement as raw materials. Effects of the catalyst and the hot treatment temperatures (500, 700, 900, 1 100, and 1 450 °C for 3 h) on the microstructure and the properties of the castables were investigated. The results reveal that after ball milling, the X-ray diffraction peak intensity of Ni decreases drastically and the angle of Ni shifts, suggesting that the lattice of Ni is distorted due to the La dissolution into Ni. With the temperature rising, the one-dimensional phases (CNTs and SiC whiskers) and two-dimensional phase (gehlenite) in the castables containing catalyst increase, the modulus of rupture and the crushing strength reach the maximum values, respectively. Therefore, the La2O3 doping Ni can obviously increase the one-dimensional and two-dimensional strengthening phases in the castables and enhance the strength of the castables. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In a overseas project, when DSM cement mixing pile was used for soft foundation treatment, there was a problem that the cement soil can not set and harden. Through different proportion tests, the problem that the cement slurry containing organic fine sand with organic matter can not be solidified was solved. It is explained that the influence of organic matter is related to its content and type. When the fly ash cement with low tricalcium aluminate content reaches a certain proportion, due to the dual effects of fly ash and clinker minerals, it can weaken the blocking effect of organic matter on cement hydration reaction process, and the cement soil set and harden normally. [ABSTRACT FROM AUTHOR]

The thermodynamic diagram of calcium-aluminum-oxygen ternary system was determined through thermodynamic equilibrium calculation of liquid steel deoxidation. Based on this thermodynamic diagram and assuming 100% yield of Ca addition, the evolution mechanisms of inclusions with three different deoxidation schemes were predicted, including M kg addition of mCa/mAl=5 alloy, M kg addition of mCa/mAl=0.2 alloy and 0.2M kg addition of mCa/mAl=0.2 alloy. The calculated results show that the evolution history of inclusion is affected by both the addition quantity and Ca/Al mass ratio of Al-Ca deoxidizer. The optimal deoxidation scheme is that the Ca/Al mass ratio is 5 and addition quantity is M kg, which makes the initial[Ca] content of 0.01% and initial[Al] content of 0.002% in liquid steel. Under such a condition, the evolution history of inclusions is 12CaO·7Al2O3(l)/CaO·Al2O3(l)→CaO(s)→12CaO·7Al2O3(l)/CaO·Al2O3(l)→CaO(s)→ 12CaO·7Al2O3(l)/CaO·Al2O3(l), and the desirable alternative formations of solid and liquid inclusions can be realized during LF refining, which can greatly enhance the effective collision and promote the floating up of inclusions. The results can be applied in industry for steel deoxidizer selection and deoxidation operation.

Copyright of Industrial Minerals & Processing / Huagong Kuangwu yu Jiagong is the property of Industrial Minerals & Processing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Calcium aluminate clinkers, in which the mass ratio of Al2O3 to SiO2(A/S) is 5, were prepared at 1500℃ for 1h by proportioning pure reagents. The alumina leaching properties and crystal structure of 12CaO·7Al2O3 in the clinkers with different molar ratios of CaO unbonded with SiO2 to Al2O3 (C/A) were studied. The effect mechanism of C/A on the clinkers was also discussed by X-ray diffraction and X-ray fluorescence analysis. When C/A is 1.0 to 1.4, the alumina-leaching ratio improves because the amount of 12CaO·7Al2O3 increases with increasing C/A. When C/A is 1.4, the alumina-leaching ratio reaches the maximum value of 93.30%. In this case, 12CaO·7Al2O3 with defects forms, and the amount of substance of CaO is less than 11.3 mol. With the further increase of C/A, the alumina-leaching ratio decreases, which is because the preferred orientation of 12CaO·7Al2O3 changes from the (211) crystal plane into the (420) crystal plane.