CaF2对阿利特-硫铝酸钡钙水泥合成及性能的影响

用化学纯试剂为原料,研究了CaF2对阿利特-硫铝酸钡钙水泥熟料矿物形成过程及水泥性能的影响。实验设计将具有早强性能的硫铝酸钡钙矿物引入到硅酸盐水泥熟料矿物体系中,并取代其中的C3A矿相。实验表明:适量的CaF2能改善熟料的易烧性,促进f-CaO的吸收和熟料矿物的形成。CaF2质量掺量为0.5%~1%时,有利于提高水泥的早期力学性能。CaF2质量掺量超过1.5%时,生成氟铝酸盐C11A7.CaF2,且不利于C3S和硫铝酸钡钙矿物形成。XRD和SEM-EDS分析表明,在该矿物体系中,含有阿利特、贝利特和少量硫铝酸钡钙矿物。这说明硫铝酸钡钙矿物能够和硅酸盐水泥熟料矿物复合并共存。     

石膏对阿利特-硫铝酸钡钙水泥水化程度及浆体组成的影响

利用前期合成的阿利特-硫铝酸钡钙水泥,应用XRD、SEM-EDS等研究了随石膏掺量的改变对新型胶凝材料阿利特-硫铝酸钡钙水泥水化程度及水化浆体组成的影响.研究结果表明:随石膏掺量增加,水化浆体的水化程度大致趋势是先增加后降低;阿利特-硫铝酸钡钙水泥最佳铝硫比为1.0/1.0,此时硬化浆体在标准稠度加水量下1d、3d和28d龄期的水化程度分别达到48.3%、57.6%和75.3%.XRD及SEM-EDS分析表明在最佳铝硫比1d、3d龄期时水化产物就已大量形成,结构致密.     

阿利特-硫铝酸钡钙水泥熟料烧成与性能研究

采用正交试验的方法研究了阿利特-硫铝酸钡钙水泥的烧成制度。结果表明：对该熟料力学性能影响最大的因素是冷却方式，其次是烧成温度，影响程度最小的是保温时间。该水泥的最佳烧成制度为：烧成温度为1380℃，保温时间为60min，冷却方式为自然冷却；同时，在最佳烧成条件下制备的阿利特-硫铝酸钡钙水泥的1d，3d，28d抗压强度分别达到24．7MPa，52．5MPa，102．5MPa，展现出良好的力学性能。同时利用XRD和SEM—EDS对熟料矿物组成及结构进行了分析。     

矿渣掺量对阿利特-硫铝酸钡钙水泥性能的影响

研究矿渣掺量对阿利特-硫铝酸钡钙水泥性能的影响,当质量分数掺量为10%时,阿利特-硫铝酸钡钙水泥3d、28d的强度分别达到44.5MPa和77.6MPa.采用XRD、SEM等方法研究阿利特-硫铝酸钡钙水泥水化产物的组成、结构和形貌,并对该水泥的水化机理进行探讨.结果表明:当矿渣掺量质量分数为10%时,促进了该水泥的水化,有利于水泥强度的提高.     

贝利特-硫铝酸钡钙水泥的合成

选择熟料率值和硫铝酸钡钙掺量为影响因素,通过正交试验研究了贝利特一硫铝酸钡钙水泥的合成条件和力学性能,并利用XRD、SEM—EDS等测试手段分析了该水泥熟料的组成和结构。结果表明：煅烧温度为1320℃时,制备贝利特-硫铝酸钡钙水泥熟料最优化组合为铝率1．4,硅率2．3,石灰饱和系数0．77,硫铝酸钡钙矿物的质量分数为9％。在此条件下该水泥的3d和28d抗压强度分别达到11．4MPa和64．8MPa,展现了良好的力学性能。     

C3S-C2.75B1.25A3S--C2S-C3A-B2O3体系熟料组成与性能的研究

设计了C3S-C2．7581．25A3S-C2S-C3A-B2O3体系组成的水泥熟料,实验以分析纯化学试剂为原料,在1350℃煅烧并保温1h。结果表明,在该熟料体系中阿利特、硫铝酸钡钙、贝利特和铝酸三钙等矿物的最佳组成分别为50％、10％、25％和15％,B2O3的适宜掺量为2％。在最佳组成和制备工艺条件下,所制的阿利特-硫铝酸钡钙水泥的1d、3d和28d抗压强度分别达到21．3MPa、48．1MPa和80．8MPa,展现良好的早期力学性能。同时还研究了氟化钙对该体系水泥熟料的影响,并利用SEN-EDS、XRD等测试手段对熟料的组成、结构及性能进行了分析研究。     

C_3S-C_(2.75)B_(1.25)A_3-C_2S-C_3A-B_2O_3体系熟料组成与性能的研究

设计了C_3S-C_(2.75)B_(1.25)A_3-C_2S-C_3A-B_2O_3体系组成的水泥熟料 ,实验以分析纯化学试剂为原料 ,在 135 0℃煅烧并保温 1h。结果表明 ,在该熟料体系中阿利特、硫铝酸钡钙、贝利特和铝酸三钙等矿物的最佳组成分别为 5 0 %、10 %、2 5 %和 15 % ,B2 O3 的适宜掺量为 2 %。在最佳组成和制备工艺条件下 ,所制的阿利特 -硫铝酸钡钙水泥的 1d、3d和 2 8d抗压强度分别达到 2 1.3MPa、4 8.1MPa和 80 .8MPa ,展现良好的早期力学性能。同时还研究了氟化钙对该体系水泥熟料的影响 ,并利用SEM -EDS、XRD等测试手段对熟料的组成、结构及性能进行了分析研究。     

阿利特-硫铝酸钡钙水泥熟料矿相体系的组成结构与性能

研究了以阿利特-硫铝酸钡钙为主导矿物的熟料矿相体系C3S—C2．75B1．25A3S^-—C2S—C2F,探讨了该体系的组成与匹配关系。研究结果表明,阿利特、硫铝酸钡钙这两种高低温型矿物可以在1380℃煅烧条件下共存于同一熟料中。从该矿相体系的力学性能分析可知,熟料的最佳质量分数：C2.7581．25A3S^-为55％,GS为15％,C2F为5％,C2S为25％。在该组成条件下,熟料的1d和3d抗压强度均在40MPa以上,展现了良好的快硬早强性能。影响熟料1d、3d强度的主要因素是C3S和C2.75B1.25A3S^-矿物的含量,影响28d强度的主要因素是C3S和C2F含量。同时,利用SEM—EDS和XRD分析了熟料的组成与结构。     

贝利特-硫铝酸钡钙水泥水化机制

贝利特-硫铝酸钡钙水泥是一种新型胶凝材料,与贝利特水泥相比,该水泥的水化速度快,凝结时间短,需水量少,耐腐蚀性好.阐述硫铝酸钡钙矿物、贝利特水泥和贝利特-硫铝酸钡钙水泥的水化机制.结果表明:适当增加石膏掺量可使贝利特-硫铝酸钡钙水泥的水化速度加快,增加钙矾石(AFt)在水化早期的形成数量,有利于水泥早期强度的提高;贝利特-硫铝酸钡钙水泥的水化产物与硅酸盐水泥相同,但其钙矾石的含量增多,氢氧化钙的含量降低.该水泥早期水化速率低于硅酸盐水泥水化速率,水化放热量减少.     

含钡废渣在建筑材料中的应用

概述含钡废渣在当今建材行业的应用,分析含钡废渣用于矿化剂、掺合料、混合材、硅酸钡水泥、铝酸钡水泥、含钡硫铝酸盐水泥和阿利特-硫铝酸钡钙水泥等方面的应用研究状况。指出:不同建筑材料中含钡废渣作用机理不同;建筑材料是消化含钡废渣的重要途径;深入研究含钡废渣应用,是对建筑材料可持续性发展的积极贡献。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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     

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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