查询词典 concrete

The research contents mainly include: First, the influence of foundation constraint condition to the temperature stress is analyzed, the temperature stress formula of ultra-long concrete anchor plate is deduced, then the influence of length to structure crack can be gotten from the formula. Second, a breathing method is set up to solve the problem of temperature stress in ultra-long concrete constructions. By setting the sliding floor, a breathing system is built up and the temperature stress reduced distinctly. Third, the effect of prestress technique in the control of temperature stress is analyzed, it is simulated and calculated through FEA to get the right way to apply the prestress. Forth, the delay of temperature field and unsteady conduction is considered, the temperature field of ultra-long concrete structure with later poured band is simulated, then temperature stress distribution after casting the concrete is calculated, finally the effect of later poured band to temperature stress of ultra-long structure is analyzed.

本文的研究内容主要包括：(1)分析了基础约束对超长混凝土结构温度应力的影响，推导了超长混凝土地基板温度应力公式，从而得出长度对结构裂缝的影响；(2)针对超长混凝土裂缝问题，提出了一种可呼吸的解决方法，通过设置滑动层，使结构成为一种"可呼吸"体系，从而有效的降低温度应力；(3)分析了预应力技术在控制超长结构温度应力中的作用，通过有限元模拟计算，得到合理的预应力施加方式；(4)考虑温度场的滞后效应及不稳定传导，对带后浇带超长混凝土结构浇注后的温度场仿真模拟，计算浇注后的温度应力分布，分析后浇带对超长结构温度应力的影响。

The life cycle unit cost and military performance of three types′ material concrete are surveyed in this paper, which are steel fibred concrete, cement concrete and asphaltum concrete.

1引言钢纤维混凝土是在水泥混凝土中均匀乱向地掺入短而不连续的钢纤维，使混凝土变成了以钢纤维为拉结料的复合混凝土材料。

Metaphysics can be distinguished for abstract and concrete metaphysics. The origin 、resource、whole and world prospect of language are different kinds of metaphysics. Their same character lies in different understanding about existence. The concrete understanding about existence requires that the concern on existence relates to the existence of man, overcome the separation between essence and appearance, facilitate time and existence、existence and existencer. The concrete understanding on existence consists concrete metaphysics.

回顾形而上学的历史不难发现，存在着抽象的形而上学与具体的形而上学，从追求存在的始基，到以观念为存在的本源，从预设终极的大全，到建构语言层面的世界图景，构成了抽象的形而上学的不同类型，它们共同的特征在于对存在的抽象理解；对存在的具体理解要求将存在的关注与人的存在联系起来，扬弃形上与形下的分离，克服本质与现象、体与用、一与多之间的悬隔，沟通时间与存在、存在与存在者，对存在的具体理解，构成了形而上学的具体形态。

Micro expand concrete in the closed steel tube could counteract concrete shrink, and make concrete prestressed. As the result, it improves concrete intensity.

微膨胀混凝土在钢管拱桥中能够抵消混凝土本身的收缩，并使混凝土初始处于受压状态，从而改善混凝土的力学性能，因此在钢管混凝土拱桥中得到广泛应用。

In this paper, permeable concrete pavement research background and significance, in view of the definition of permeable concrete pavement, characteristics and a brief overview of classification, and water permeability of concrete and its surface structure analysis, and then proceed with the design, the final list were permeable concrete pavement of a number of advantages, and applications are discussed and research, thereby found that there are problems and give solutions, and ultimately come to the conclusion and outlook.

本文阐述了透水性混凝土路面的研究背景和意义，针对透水性混凝土路面的定义、特点以及分类进行了简要概述，并对透水性混凝土及其路面构造进行了分析，然后进行配合比设计，最后分别列举了透水性混凝土路面的多项优点，并对其应用前景进行了探讨和研究，从而发现存在问题并给出解决方法，最终得出结论并进行展望。

The distribution of temperature stress was calculated by finite element analysis. The results showed when the surface temperature of concrete was higher than 110℃, the temperature stress was more than 4 MPa without regard to the creep. This might be lead to the damage of the surface of concrete. At the same time, a lot of microstructure analysiss such as XRD, SEM, IR, HSA etc. were done to analysis the difference of the component and microstructre of concrete before and after corrosion. The results indicated that the decomposion of CSH gel and calcium hydroxide and the creation of dilatability calcium oxide were the internal reason of the deterioration of concrete in the corrosion form of high heat.

该文通过有限元方法计算了由于温度而产生的结构应力分布，计算结果表明当混凝土表面温度超过110℃时，如不考虑徐变时表层混凝土受到的温度应力将超过4MPa，这使得表层混凝土很容易因温度应力而破坏；同时通过X射线衍射分析、扫描电子显微分析和混凝土孔结构分析等多种微观结构测试手段，分析了混凝土受热前后的宏观性能以及微观组成和结构的变化，指出混凝土原水化产物如水化硅酸钙凝胶和氢氧化钙的分解以及膨胀性产物氧化钙的产生是高热腐蚀形式下混凝土破坏的内在原因。

Our main products are: computer automated rapid freezing and thawing of concrete tester, concrete carbonation chamber, concrete move Miriam, concrete to accelerate the conservation of boxes, concrete mixer, cement mortar conservation tank, cement rapid conservation boxes, cement paste mixer, cement glue sand mixer, cement mortar Tap Taiwan, the electric bending testing machine, making me boil marcescens, electric saws stone machine, sieve analysis of negative pressure device, Rutting Tester, Pavement Deflection Tester, rotating compaction test equipment etc..

公司主要产品有：微机全自动混凝土快速冻融试验仪、混凝土碳化试验箱、混凝土动弹仪、混凝土加速养护箱、混凝土搅拌机、水泥胶砂养护水槽、水泥快速养护箱、水泥净浆搅拌机、水泥胶砂搅拌机、水泥胶砂振实台、电动抗折试验机、雷氏沸煮箱、电动锯石机、负压筛析仪、车辙试验仪、路面弯沉试验仪、旋转压实仪等试验设备。

In the process of building and using the mass concrete structures, because of the effect of out-side condition and themselves, some faults will form in the structure, these faults will effect the bearing capability and endurance Using nondestructive testing method to test the concrete"s quality and diagnose its healthy, which has the significant sense in assessing the safety stability and research of the administering diseasesThis dissertation mostly researched the testing methods in the mass concrete structure, discussed the principles, methods, features, sphere of application of the ultrasonic testing in the mass concrete structure with faults, used dynamic FEM to simulate the testing process, discussed when the concrete structure with cracks is under the effect of the pulse, how the elastic waves propagate and what are their changing feature, Researched the principles of the first-arriving waves" phase when the cracks" depths are not same, obtained the relation between the inversion point and the cracks" depth, which has the direction sense in the application of projects,The second part of this dissertation is CT , which used the ultrasonic wave running through the tested-substance to get arriving-time of the ultrasonic wave, then inverse the image This dissertation drawed one CT program which can well present the different little cells ultrasonic wave velocity profiles of the substance, thereby to diagnose the quality of the part of the tested-substance, CT has the better using foreground..

在混凝土结构的施工及使用过程中，由于受其自身及外界各种因素的影响，常常会产生一些缺陷，对结构物的承载能力和耐久性造成严重影响，采用无损检测技术进行质量检测和健康诊断，这对混凝土结构开展安全、稳定性评估以及病害隐患治理研究具有重要意义。本论文主要针对大体积混凝土结构缺陷的检测方法展开研究工作，重点讨论了超声波法检测混凝土结构裂缝的基本原理和方法及其特点、适用范围，运用动力有限元数值模拟其检测过程，探讨了有裂缝缺陷的混凝土结构在脉冲荷载作用下弹性波的传播及其变化特征，研究了不同裂缝深度下首波相位变化规律，得出了反转临界点与裂缝深度之间的关系，这对实际工程应用具有指导意义。声波CT是一种新的无损检测技术，它是利用声波穿透被检测体获取声波接收时间，来进行计算机反演成像的技术。本文利用直射线法编制了层析成像程序，能较好地呈现被检测物体各微小单元的声波速度分布图像，从而对检测体的质量状况作出诊断评估，具有较好的应用发展前景。

During the calculation of the early age temperature field, the early age physical and mechanical performance of concrete varies with its age, therefore in the second chapter we discuss the early age physical and mechanical performance of concrete and its development regulation with time, we emphasize elastic module and the development about the early age strength of concrete varying with time, at the same time consider the effect of shrink and creep upon the early age of concrete, in succession discuss how to confirm the physical parameter of thermodynamics of concrete.

之后讨论了混凝土的热物理参数的确定。为了能够正确合理的应用有限元方法求解早期混凝土温度场问题，第三章论述了求解温度场的有限元方法。第三章首先对热传导的微分方程作了阐述。之后确定温度场的边界条件。本章采用变分原理推导有限单元法计算温度场的公式。因此在第二小节叙述了变分原理，然后阐明了不稳定温度场的计算的三种方法，确定第四章分析中将采用向后差分法求解0#箱梁早期的温度场。

HQX Series Concrete Recycle Equipment is mainly used in clearing, separating and recycling stones, sands and water of waste concrete to Concrete Mixing Plants, Concrete Mixing Truck and Concrete Pump to save expenses for customers such as draining contaminations, clearing away concretions and transports etc.

HQX系列混凝土清洗回收装置主要用于混凝土搅拌站、运输车与输送泵清洗废水、废料的回收处理，将碎石、沙子及水分离回收再利用，为用户节省排污清除固结物及运输等费用。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了