低碱度钢渣基油井及地热井胶凝材料的研究——Ⅰ低碱度钢渣的化学成分、矿物组成和矿相特征

通过化学分析、XRD、OM研究了低碱度钢渣的化学成分、矿物组成和矿相特征及其内在联系 ,建立了低碱度钢渣的分类概念。低碱度钢渣是指碱度小于 2 .4,以橄榄石、镁蔷薇辉石、RO相、硅酸二钙为主要矿物的钢渣     

碱度对少熟料低碱度钢渣水泥强度的促进作用

本文讨论了碱和液相碱度对少熟料低碱度钢渣水泥强度的促进作用。结果表明：水化液相具有高碱度和富Ｎａ２ＳＯ４的水化环境将促进低碱度钢渣和矿渣的水化，高Ｃ３Ｓ适量Ｆ—ＣａＯ的立窑熟料能显著改善少熟料低碱度钢渣水泥体系的早强和后期强度性能。     

低碱度钢渣基油井及地热井胶凝材料的研究--Ⅳ富铁低碱度钢渣的水热反应及胶凝性

通过XRD、DTA-TG、SEM和EPMA等手段研究了富铁低碱度钢渣的水热反应、水热产物及其胶凝性.结果表明富铁低碱度钢渣的水热反应产物为水化钙铁石榴子石;富铁低碱度钢渣-石英砂体系的水热反应产物以Fe-tobemorite为主,蒸压强度显著提高;富铁低碱度钢渣-石灰体系的水热反应产物为高碱度的C2SH.     

利用铁尾矿高温改性钢渣的性能

研究了铁尾矿高温改性处理对钢渣体积稳定性和胶凝性能的影响,结合X射线衍射分析、扫描电镜观察和能谱分析等测试方法,对改性钢渣的矿物组成和微观形貌进行了分析.发现铁尾矿的高温改性显著降低了钢渣中游离氧化钙(f--CaO)的含量,提高了钢渣胶凝性能.铁尾矿掺加质量分数为20%和处理温度为1250℃时,钢渣中f--CaO的质量分数由4.84%降低至1.82%,降幅达到62.4%,28d活性指数比原始钢渣体系提高5.6%.铁尾矿掺量由10%增加至30%时,改性钢渣中相继出现镁蔷薇辉石、镁黄长石和钙镁辉石等硅酸盐矿相.高温改性过程促使RO相分解,RO相中的FeO转化为磁铁矿相(Fe3O4).     

钢渣的难磨相组成及其胶凝性的研究

将钢渣粉磨后分级,得到7种不同粒径的试样,用X射线衍射仪分析了它们的矿物成分,研究了粗粒子试样在硅酸钠作用下的胶凝性,并以矿渣为参比样,比较研究了钢渣细粉体与矿渣易磨性及胶凝性的差异,还用扫描电子显微镜及X射线能谱仪分析了钢渣中硅酸盐矿物(C3S和C2S)的固溶组分。结果发现了钢渣中难磨组分为铁铝酸钙[Ca2(Al,Fe)2O5]和镁铁相固溶体(MgO.2FeO),且它的水化反应活性很低,而钢渣中硅酸三钙(C3S)和硅酸二钙(C2S)具有较好的易磨性,其易磨性比矿渣略好,但其水化反应活性明显比矿渣差,钢渣中的C3S和C2S固溶了较多的异离子。分析指出了钢渣水化活性低的本质是由于它所含的矿物Ca2(Al,Fe)2O5、MgO.2FeO无水硬性,C2S呈γ型,水硬性低,而C3S是在长时间高温下形成的,它具有较稳定的结构,从而它的水化活性亦相对较低。     

转炉钢渣改性的试验研究

高碱度转炉钢渣中游离氧化钙(f-CaO)的存在会造成膨胀,限制了转炉钢渣在建筑行业的使用.在高温下,使转炉钢渣中的f-CaO与硅质改性剂发生反应,生成硅酸盐类.试验表明:硅质改性剂的加入不仅能够降低钢渣中f-CaO的含量,同时中活性矿物硅酸盐、铝酸盐、铰铝酸盐等含量相对增加,钢渣的胶凝活性得到改善,为转炉钢渣作为建筑材料提供了理论依据.     

转炉钢渣的物化性能研究及其微观结构分析

通过化学成分快速分析仪、XRD和SEM等仪器对钢渣的主要氧化物、物化性能及其微观结构进行分析讨论。结果表明:钢渣的主要成分为CaO和Fe_2O_3,属于高碱度钢渣;粒径主要分布在0～10μm之间,主要由玻璃相组成,含有少量结晶度不高的晶体矿物,具有很大的潜在活性,其内部致密,表面粗糙多孔,孔道大小不一且分布不均,可作为一种性能良好的胶凝材料和吸附剂。     

开发透辉石市场前景看好

透辉石是多种工业的原料,同时又是一种节能产品,用途十分广泛.透辉石属钙镁的偏硅酸盐非金属矿物，为柱状、粒状、棒状或放射状晶体，一般呈浅绿、浅灰或乳白色玻璃光泽、硬度为5.5--6,相对密度为3.27,热膨胀系数低,具线性膨胀特征.其主要化学成分为氧化钙、氯化镁。此外，还含极少量的三氧化二铝、氧化铁、氧化钠等。     

铝酸盐矿物与碳酸钙的水化活性作用

通过ＸＲＤ、ＳＥＭ和强度检测等方法，分别研究了ＣａＣＯ３与Ｃ３Ａ单矿、水泥熟料和高铝水泥中的铝酸盐矿物之间的水化反应及过程特征。研究结果表明，ＣａＣＯ３对这几种铝酸盐矿物都具有水化活性作用，它们的水化反应产物为三碳型水化碳铝酸钙和单碳型水化碳铅酸钙；三破型碳铅酸钙不稳定，在通常情况下，它会转化为单碳型碳铝酸钙；水化碳铝酸钙的形成对水泥强度的发展有积极作用。     

含钡钙矾石相的量子化学研究

钙矾石是水泥的主要水化产物之一，含钡钙矾石相是新水泥矿物含钡硫铝酸钙的主要水化产物，它们是水泥石强度的主要来源。本文利用新发展起来的量子化学ＳＣＣ—ＤＶ—Ｘａ方法对钙矾石相和含钡钙矾石相进行了研究，获得了分子结构的键级、集居数、净电行和共价键级等数据。结果表明：两矿物结构中Ａｌ—Ｏ键的化学参数变化不大，差异较大的是钙矾石中Ｃａ—Ｏ键和含钡钙矾石中Ｂａ—Ｏ键的键级和共价键级。认为Ｂａ—Ｏ键的键级和共价键级大于Ｃａ－Ｏ键是含钡硫铝酸钙水化强度大于硫铝酸钙的主要原因之一。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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