查询词典 concrete

Cracks in bulky concrete will reduce the strength and frost resistance of concrete,which has bad effect on the impermeability and durability of concrete.

大体积混凝土裂缝会降低混凝土的强度和抗冻性，对混凝土抗渗性和耐久性的影响尤为严重。

Concrete aggregate contains active aggregate like opal which can react with alkali in concrete and generate new material and hazardous gas expansion to cause damages to concrete like knurl and crack.

混凝土骨料中含有活性骨料，如蛋白石等，能与水泥中的碱反应，生成新的物质，产生有害的体积膨胀，造成混凝土隆起、开裂，引起混凝土破坏。

The production reason and resistance method of the thermal crack of large volume concrete are summed up in this paper based ona large number of reference. And the resistance method was used in the foundation construction of two engineering buildings.The strict measurement to avoid the thermal crack was been adopted in the laches of material selection, construction method, concrete irrigating and conserving technics. The inside and outside temperatures of the concrete foundation were inspected.

本文查阅了大量参考文献，总结了大体积混凝土温度裂缝产生的原因以及控制方法，根据具体情况把这些方法灵活应用于两个实际大厦的基础工程施工，在施工中对材料选择、施工布置、浇筑工艺、养护等几个环节采取了严格的控制措施，并同时对基础典型位置的内外温度差进行了监测。

The analysis on the test result shows that the temperature distribution in CFST members caused by solar radiation is nonlinear,and the nonlinear character is most evident when center point of concrete gets its lowest temperature. The temperature of the center point is affected by various directions, especially the strong potential. In the side exposed to the sun in the afternoon, apart from the center point, temperature varies laggardly when the point of concrete in the same series is more close to the center. But in the side not exposed to the sun in the afternoon, temperature varies laggardly when the point of concrete in the same series is more close to the center.

结果表明，日照作用下截面的温度场为非均匀场，混凝土中心的温度达到最小值时，截面温度场的非线性特性最明显，圆心点的温度受各个方向温度的共同作用，更多地受到强势方向的影响；下午时处在向阳面的各系列，同一系列上混凝土各点温度变化随直径缩小趋缓，越靠近圆心，温度变化越缓和，对外部环境的影响呈滞后现象越明显；而在下午时处在背阴面的各系列除圆心点外，同一系列上越靠近圆心的混凝土测点，温度变化越缓和。

MANDER constructive model is used to simulate stress-strain relationship of confined concrete; three sensitive parameters (pier height, confined index and concrete strength) are analyzed and the effect rule that how non-linear constructive model of reinforced concrete affects load of high pier is obtained.

由于高桥墩的几何非线性及材料非线性本构关系所导致的二次效应非常显著，因此采用传统的以弹性理论为基础的设计计算方法求算高柔桥墩的内力和变形会引起较大偏差。

Therefore, the key to improve strength and durability of the concrete is to decrease flaws of concrete, especially to meliorate the structure of interface, which will improve the compactness and cohesion of interface, thus improve the strength and durability of the concrete.

因此，要提高混凝土材料的强度和耐久性等宏观性能，就必须减少其内部的微观缺陷，特别是要改善界面过渡区的结构，提高界面过渡区的密实性和黏结力，从而提高混凝土的强度和耐久性。

Base on the problem of large quantity fatigue loads on corroded R.C. structure and small quantity study of its mechanical property, bending resistance fatigue test of corroded R.C. beams is discussed in this paper. The influence of stress ratio and re-bar weight loss ratio on bending resistance fatigue performance of corroded R.C. beams are researched, and the relation between strains of corroded re-bars and fatigue life of beams are obtained. The main research contents and conclusions are as following: 1. Under the fatigue loads, the overstrain of concrete approximately coincidences three stages strain development and accumulation rule, and the mechanical property of concrete is deteriorated. The fatigue damage of concrete is accumulated. The overstrain of re-bars increases and the increase rate decreases.

鉴于实际工程中大量存在腐蚀钢筋混凝土结构承受反复荷载作用，但其力学性能研究不多的问题，本论文进行了锈蚀钢筋混凝土梁抗弯疲劳试验，研究了应力比和钢筋锈蚀率对锈蚀钢筋混凝土梁抗弯疲劳性能的影响，得出了锈蚀钢筋的应变与构件疲劳寿命之间的关系曲线，主要研究内容及结论如下：(1)在循环荷载下，混凝土残余变形基本符合三阶段变形规律，力学性能劣化，疲劳损伤积累。

With the development of the prestressed concrete construction technology, more and more prestressed concrete box girder bridges have arisen in our nation. However, after construction, the appearance of the cracks on some of these bridges takes some unfavourable influence on the structures. In common sense, we should take some methods to strengthen and repair these bridges as soon as possible, but because of the civil pecuniary condition, we cant repair all the broken bridges in one time. Therefore a scientific estimation must be made about the load-carrying capacity of these prestressed concrete box girder bridges with cracks, so that we can decide which bridge should be repaired firstly.

随着预应力施工技术的不断进步，我国已拥有越来越多预应力混凝土箱形梁桥，这些桥在使用一段时间后，有很大一部分箱梁出现了大量的裂缝，这些裂缝的出现对桥梁结构将产生不利的影响，所以应尽可能的对其进行加固修补，但限于国内实际经济状况，我们不可能一次性全部进行加固改造，需要对在役的这些开裂后的预应力梁桥的工作状态特别是承载力做出科学的评判，以便区分轻重缓急，优先实施。

With the development of the prestressed concrete construction technology, more and more prestressed concrete box girder bridges have arisen in our nation. However, after construction, the appearance of the cracks on some of these bridges takes some unfavourable influence on the structures. In common sense, we should take some methods to strengthen and repair these bridges as soon as possible, but because of the civil pecuniary condition, we can't repair all the broken bridges in one time. Therefore a scientific estimation must be made about the load-carrying capacity of these prestressed concrete box girder bridges with cracks, so that we can decide which bridge should be repaired firstly.

随着预应力施工技术的不断进步，我国已拥有越来越多预应力混凝土箱形梁桥，这些桥在使用一段时间后，有很大一部分箱梁出现了大量的裂缝，这些裂缝的出现对桥梁结构将产生不利的影响，所以应尽可能的对其进行加固修补，但限于国内实际经济状况，我们不可能一次性全部进行加固改造，需要对在役的这些开裂后的预应力梁桥的工作状态特别是承载力做出科学的评判，以便区分轻重缓急，优先实施。

To best achieve the working performance of the said concrete, with the help of theology theory in the research, we have analyzed the principle of free-vibration densifying and shaping of mixed concrete, that is, with the perquisite of fluidity, the concrete should have good property of filling-up-space, penetration through voids of fixed steel reinforcement, adherence and prevention from losing water and segregation, and the conflict between anti-segregation and deforming capability should be sorted out.

为得到自密实高性能混凝土的最佳工作性能，在研究中借助流变学理论，分析研究了混凝土拌合物免振捣成型和密实的机理，在大流动性的前提下，要求混凝土具有良好的填充性、钢筋间隙通过性和粘聚性，防止泌水、离析，解决变形能力与抗离析性能力的矛盾。

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