冻融循环作用下煤矸石-铁尾矿烧结多孔砖的损伤性能

大宗工业固废建材化利用是工业可持续发展的一项长远战略方针,利用煤矸石、铁尾矿生产烧结砖可为内蒙古地区大宗工业固废综合利用提供新思路。针对内蒙古地区自然环境特征,对煤矸石-铁尾矿烧结多孔砖标准试件进行冻融循环试验,分析冻融前后煤矸石-铁尾矿烧结多孔砖外观、质量、抗压强度、吸水率和体积密度变化情况;基于Wiener过程对试样损伤规律进行分析,以相对质量损伤为指标建立可靠度模型,并对指标选取合理性进行验证,计算漂移系数和扩散系数求解冻融循环作用后煤矸石-铁尾矿烧结多孔砖可靠度函数曲线;利用冻融寿命预测模型对室内外冻融循环次数进行转化,并对冻融循环作用后煤矸石-铁尾矿烧结多孔在不同阈值条件进行寿命预测。结果表明：煤矸石-铁尾矿烧结多孔砖标准试件抗压强度为10.6MPa,吸水率为13.3%,体积密度为1779.7kg/m₃^;煤矸石-铁尾矿烧结多孔砖性能随冻融循环次数增加劣化程度加深,其质量、抗压强度、吸水率和体积密度损伤度分别为7.1%、38%、18%和3.6%,同时冻融循环后砖体表面出现隆起、微裂缝和轻微剥落现象;对可靠度函数曲线分析可知煤矸石-铁尾矿烧结多孔砖损伤符合材料破坏特点,在阈值为0.2,0.3,0.4条件下,煤矸石-铁尾矿烧结多孔砖耐久性寿命分别为11.1年,35.4年,85.6年。     

徐州矿区煤矸石堆放的生态危害及其烧结模数多孔砖的开发

徐州矿区长期堆放的煤矸石对当地大气、土壤、地下水等造成了严重的污染,回填或堆放不当还诱发环境地质灾害。煤矸石化学成分的分析结果显示当地主要矿区煤矸石的化学成分基本符合墙材生产的技术性能指标。新型煤矸石烧结模数多孔砖是徐州矿区煤矸石墙材资源化的重要方式之一,这种煤矸石多孔砖以全煤矸石为原料配方,是以2M为主型砖尺寸的单手持砖系列的模数砖型,具有多排且有序交错排列的矩形条孔,并可在一套便捷高效的生产工艺中生产,开辟了发展新型绿色节能墙材的新途径。     

煤矸石烧结砖酥砖的原因分析及处理

煤矸石烧结多孔砖目前是山东省推广的新型节能建材之一。工程上出现的主要问题是砖出现大面积石灰爆裂、酥砖,对工程安全直接造成危害。本文提出了合理处理建议,为类似问题的解决提供了借鉴。     

煤矸石对粉煤灰页岩砖主要性能的影响

随着社会对资源综合利用,环境效益的关注度越来越高。资源的循环利用成为建筑行业取得持续发展的动力。探究以煤矸石作为粉煤灰页岩砖主要造孔剂的各项性能,得出在一定含量下,不仅降低产品的密度,同时使烧结制品的导热系数大幅度下降,最后获得保温效果好、结构稳定、力学性能良好的烧结多孔砖。     

碱矿渣胶凝材料在快速测定烧结多孔砖抗压强度中的应用

烧结多孔砖生产质量控制和施工质量控制都要求能快速测定出烧结多孔砖抗压强度值,介绍了碱矿渣胶凝材料在快速检测烧结多孔砖抗压强度中的作用原理及应用。     

烧结粉煤灰多孔砖砌体力学性能研究

多孔砖砌体具有节约土地资源、保温隔热的作用,它已成为砌体结构的主要材料。对烧结粉煤灰多孔砖砌体的抗压强度和抗剪强度的试验结果进行了分析。试验表明,烧结粉煤灰多孔砖砌体的抗压强度和抗剪强度都能很好的满足国家规范要求;并且得到了合理的弹性模量。不仅证明了烧结粉煤灰多孔砖是一种十分理想的建筑材料,也为烧结粉煤灰多孔砖的推广建立了基础。     

糖蜜乙醇废液烧结页岩矩形

通过研究糖蜜乙醇废液烧结页岩矩形多孔砖抗剪实验,分别用M5、M7.5、M10水泥砂浆砌筑30件砌体,进行抗剪试验。结果表明,对其破坏现象进行分析,其现象与普通烧结页岩多孔砖相似;由于糖蜜乙醇废液的掺入,在烧结过程中挥发使其表面粗糙,使砌体与砂浆更好的粘结,因此糖蜜乙醇废液烧结页岩矩形多孔砖的抗剪强度比普通烧结页岩大,本文建议的公式为 与规范相比,具有一定的安全度。     

污泥烧结页岩多孔砖耐水性能试验研究

为了研究污泥掺量对污泥烧结页岩多孔砖耐水性能的影响,以便找到最佳污泥掺量的同时找出一种非破损检测砖体耐水性能的方法,首先测定不同污泥掺量下污泥烧结页岩多孔砖在饱水状态下砖体导热系数,再测定其抗压软化系数。结果表明:污泥烧结页岩多孔砖软化系数随着污泥掺量的增加而增大,砖体饱水状态下的导热系数也随着污泥掺量增加而增大。当污泥烧结页岩多孔砖软化系数Kp≥0.85时,污泥烧结页岩多孔砖污泥掺量不得大于20%。建议将饱水状态下砖体导热系数作为评价砖体耐水性能指标,以达到非破损检测砖体耐水性能的目的。     

黄河淤泥承重烧结多孔砖的试验研究

对以黄河淤泥为主要原料掺入适量粉煤灰等外加剂的节能承重烧结多孔砖进行试验研究,其结果表明,该产品容重低、强度高、导热系数小、隔热、外观质量好,且工艺流程简单,易于控制,其主要性能指标符合GB13544-2000<烧结多孔砖>要求.因此黄河淤泥多孔砖代替实心粘土砖用于承重墙是完全可行的.     

非黏土多孔砖砌体房屋结构抗震性能分析

非黏土多孔砖做为一种新的墙体材料,其各种力学性能均优于烧结黏土砖。非黏土多孔砖做为墙体承重材料是最近几年才逐渐受到人们的关注,目前对于非黏土多孔砖结构体系的系统研究相对缺乏。文章对非黏土多孔砖砌体房屋的抗震性能进行深入研究,并利用SAP2000有限元分析软件模拟了一栋7层非黏土多孔砖砌体房屋在El-Centro波作用下...     

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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