The Experts below are selected from a list of 14967 Experts worldwide ranked by ideXlab platform
Peiyu Yan - One of the best experts on this subject based on the ideXlab platform.
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Self-cementitious property of Steel Slag powder blended with gypsum
Construction and Building Materials, 2016Co-Authors: Jihui Zhao, Peiyu Yan, Dongmin Wang, Da-wang Zhang, Hao WangAbstract:Abstract In order to reveal the self-cementitious property of Steel Slag, the hydration and hardening characteristics of Steel Slag powder blended with 5 wt% gypsum were investigated from hydration heat, non-evaporable water (Wn) and Ca(OH)2 contents, hydration products, strength and so on. The results show that the hydration process of Steel Slag-gypsum also has two exothermic peaks, which is similar to cement, but it has a longer early hydration period and lower hydration exothermic rate. The second exothermic peak value of Steel Slag-gypsum is only about one eighth of that of cement. The hydration products of Steel Slag-gypsum mainly contain amorphous C-S-H gels, rod-like ettringite and a small amount of Ca(OH)2, while almost no ettringite is generated in hydration products of pure Steel Slag. Compared with pure Steel Slag paste, Steel Slag-gypsum paste has a more hydration products and more compact structure. The relationships of Wn contents or Ca(OH)2 contents with ages for Steel Slag-gypsum paste show a good exponential relationship, while both the paste and mortar strengths of Steel Slag-gypsum with logarithm of ages conform to the linear relationship. In addition, the Wn content and strength of Steel Slag-gypsum paste can be obviously improved by the simulated cement pore solution at 28 days and 90 days.
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Cementitious properties of super-fine Steel Slag
Powder Technology, 2013Co-Authors: Qiang Wang, Jianwei Yang, Peiyu YanAbstract:Abstract In this study, a super-fine Steel Slag with the specific surface area of 786 m2/kg was prepared by mechanical grinding. Its cementitious properties were investigated by comparing the results obtained from it with those obtained from ordinary Steel Slag, fly ash, and cement. The results show that the super-fine Steel Slag exhibits a much higher activity at early and middle ages but a lower activity at late ages than the ordinary Steel Slag. Though the specific surface area of the super-fine Steel Slag is much larger than that of cement, the activity of the super-fine Steel Slag is still obviously lower than that of cement. The super-fine Steel Slag replacement tends to weaken the cementitious properties of the composite binder. As compared to fly ash, the super-fine Steel Slag tends to make more contributions to the hardening of concrete at early ages but far less contributions at late ages. Overall, it seems that it is uneconomical to produce super-fine Steel Slag by mechanical grinding.
Zhao Shi-ran - One of the best experts on this subject based on the ideXlab platform.
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Experimental Research on the Volume Stability of Steel Slag Fine Aggregate and Steel Slag Mortar
Bulletin of the Chinese ceramic society, 2012Co-Authors: Zhao Shi-ranAbstract:Measuring the autoclave pulverization rate of every granulometric class Steel Slag fine aggregate by autoclave expansion test,separately carried on pressure steaming stability test of different Steel Slag mixed quantity of mortar testblock,using XRD testing techniques,analysed the impact of volume stability which by the white granule and brown granule in Steel Slag fine aggregate.The results showed that if the white granule in Steel Slag and storage period is short,Steel Slag fine aggregate's stability should use the autoclave pulverization rate of autoclaving 0.6-1.18 mm partical size then 0.6 mm sieving's Steel Slag and combine with the volume stability of the prepared motar as evaluation criteria;Meet the premise of Steel Slag cement mortar's stability,Steel Slag's added quantity should be different by the different granulometric class of Steel Slag fine aggregate replacing natural sand preparing Steel Slag cement mortar.
Qiang Wang - One of the best experts on this subject based on the ideXlab platform.
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Cementitious properties of super-fine Steel Slag
Powder Technology, 2013Co-Authors: Qiang Wang, Jianwei Yang, Peiyu YanAbstract:Abstract In this study, a super-fine Steel Slag with the specific surface area of 786 m2/kg was prepared by mechanical grinding. Its cementitious properties were investigated by comparing the results obtained from it with those obtained from ordinary Steel Slag, fly ash, and cement. The results show that the super-fine Steel Slag exhibits a much higher activity at early and middle ages but a lower activity at late ages than the ordinary Steel Slag. Though the specific surface area of the super-fine Steel Slag is much larger than that of cement, the activity of the super-fine Steel Slag is still obviously lower than that of cement. The super-fine Steel Slag replacement tends to weaken the cementitious properties of the composite binder. As compared to fly ash, the super-fine Steel Slag tends to make more contributions to the hardening of concrete at early ages but far less contributions at late ages. Overall, it seems that it is uneconomical to produce super-fine Steel Slag by mechanical grinding.
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hydration properties of basic oxygen furnace Steel Slag
Construction and Building Materials, 2010Co-Authors: Qiang WangAbstract:Abstract Basic oxygen furnace Steel Slag is the most common Steel Slag in China. In this study, the hydration properties of this kind of Steel Slag were investigated. Steel Slag was ground separately to 458 m 2 /kg as well as 506 m 2 /kg. Different hydration conditions were set by changing the temperature or pH value. Hydration exothermic rate was measured within 4 days. Non-evaporable water content, hydration products and hardened paste morphologies were investigated at 1, 3, 7, 28 and 90 days. The results showed that the hydration process of Steel Slag was similar with that of cement. However, its hydration rate was much lower than cement. The hydration rate of Steel Slag at the early age could be accelerated by raising the fineness of particles, curing temperature or alkalinity of solution. However, raising the pH value of solution had little efficiency for the later hydration of Steel Slag and raising curing temperature even had negative influence on its later hydration. CSH gel and Ca(OH) 2 were the main hydration products of Steel Slag. A part of C 3 S and C 2 S crystal in Steel Slag had very low activity and unhydrated after 90 days. RO phase was almost inert. The interface between the particles of RO phase and CSH gel was a weak region in the system.
Huimei Zhu - One of the best experts on this subject based on the ideXlab platform.
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Effects of Steel-Slag Components on Interfacial-Reaction Characteristics of Permeable Steel-Slag-Bitumen Mixture.
Materials (Basel Switzerland), 2020Co-Authors: Wenhuan Liu, Li Hui, Huimei ZhuAbstract:In this paper, a permeable Steel-Slag–bitumen mixture (PSSBM) was first prepared according to the designed mixture ratio. Then, the interaction characteristics between Steel Slag and bitumen were studied. The chemical interaction between bitumen and Steel Slag was explored with a Fourier-transform infrared spectrometer (FT-IR). The influence of Steel-Slag chemistry, mineral composition, and bitumen reaction on phase angle, complex shear modulus (CSM), and rutting factor was explored with dynamic shear rheological (DSR) tests. The PSSBM had better properties, including high permeability, water stability, Marshall stability, high-temperature (HT) stability, and low volume-expansion rate. Bitumen-coated Steel Slag can prevent heavy-metal ions from leaching. In the infrared spectra of the mixture of a chemical component of Steel Slag (calcium oxide) and bitumen, a new absorption peak at 3645 cm−1 was ascribed to the SiO–H stretching vibration, indicating that new organic silicon compounds were produced in the chemical reaction between calcium oxide and bitumen. SiO–H had an obvious enhancement effect on the interfacial adhesion and high-temperature rheological property of the mixture. In the mineral components of Steel Slag, dicalcium and tricalcium silicate reacted with bitumen and generated new substances. Chemical reactions between tricalcium silicate and bitumen were significant and had obvious enhancement effects on interfacial adhesion and high-temperature rheological properties of the mixture. The results of FT-IR and DSR were basically consistent, which revealed the chemical-reaction mechanism between Steel-Slag microcomponents and bitumen at the interface. SEM results showed that pits and grooves on the surface of the Steel-Slag aggregate, and the textural characteristics provide a framework-like function, thus strengthening the strength and adhesion of the Steel-Slag–bitumen aggregate interface.
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properties of a Steel Slag permeable asphalt mixture and the reaction of the Steel Slag asphalt interface
Materials, 2019Co-Authors: Wenhuan Liu, Huimei ZhuAbstract:Steel Slag is an industrial solid waste with the largest output in the world. It has the characteristics of wear resistance, good particle shape, large porosity, etc. At the same time, it has good adhesion characteristics with asphalt. If Steel Slag is used in asphalt pavement, it not only solves the problem of insufficient quality aggregates in asphalt concrete, but can also give full play to the high hardness and high wear resistance of Steel Slag to improve the performance of asphalt pavement. In this study, a Steel Slag aggregate was mixed with road petroleum asphalt to prepare a permeable Steel Slag–asphalt mixture, which was then compared with the permeable limestone–asphalt mixture. According to the Technical Regulations for Permeable Asphalt Pavement (CJJT 190-2012), the permeability, water stability, and Marshall stability of the prepared asphalt mixtures were tested and analyzed. In addition, the high-temperature stability and expansibility were analyzed according to the Experimental Regulations for Highway Engineering Asphalt and Asphalt Mixture (JTG E20-2011). The chemical composition of the Steel Slag was tested and analyzed by X-ray fluorescence spectrometer (XRF). The mineral composition of the Steel Slag was tested and analyzed by X-ray diffractometer (XRD). The asphalt was analyzed by Fourier transform infrared spectroscopy (FTIR). The results show that the Steel Slag asphalt permeable mixture had good permeability, water stability, and Marshall stability, as well as good high-temperature stability and a low expansion rate. The main mineral composition was ferroferric oxide, the RO phase (RO phase is a broad solid solution formed by melting FeO, MgO, and other divalent metal oxides such as MnO), dicalcium silicate, and tricalcium silicate. In the main chemical composition of Steel Slag, there was no chemical reaction between aluminum oxide, calcium oxide, silicon dioxide, and asphalt, while ferric oxide chemically reacted with asphalt and formed new organosilicon compounds. The main mineral composition of the Steel Slag (i.e., triiron tetroxide, dicalcium silicate, and tricalcium silicate) reacted chemically with the asphalt and produced new substances. There was no chemical reaction between the RO phase and asphalt.
Shuhua Liu - One of the best experts on this subject based on the ideXlab platform.
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Influence of fineness on the cementitious properties of Steel Slag
Journal of Thermal Analysis and Calorimetry, 2014Co-Authors: Shuhua LiuAbstract:In this paper, the influence of fineness on the cementitious properties of Steel Slag and the properties of cement containing Steel Slag with different finenesses were investigated. The results show that increasing the fineness can significantly enhance the early as well as the late cementitious properties of Steel Slag. However, the early hydrations of cement and Steel Slag tend to hinder each other especially in the case of large Steel Slag replacement and high fineness of Steel Slag. Therefore, increasing fineness of Steel Slag cannot improve the early cementitious properties of the cement containing Steel Slag. At 28 days, the hydrations of Steel Slag and cement tend to promote each other. Increasing the fineness of Steel Slag enhances the late cementitious properties of the cement containing Steel Slag significantly.
