学术英语翻译

Conveying of most building concrete from the mixture or truck to the form is done in bottom-dump buckets or by pumping through steel pipelines.（大多数建筑混凝土从散沙到塑性是通过底部卸料的吊斗或钢管泵运输的）The chief danger during conveying is that of segregation. （运输中的主要危险是隔离问题）The individual components of concrete tend to segregate because of their dissimilarity.（由于混凝土的成分不同，所以要分离它们）In overly wet concrete standing in containers or forms, the heavier gravel components tend to settle, and the lighter materials, particularly water, tend to rise. Lateral movement , such as flow within the forms, tends to separate the coarse gravel from the finer components of the mix.（处于容器或模型中的过度潮湿的混凝土，其中较重的砾石组分应该沉降，较轻的材料特别是水应该升高。横向运动，例如形式内的流动，应该将粗砂砾与混合物的较细组分分开。）The danger of segregation has caused the discarding of some previously common means of conveying, such as chutes and conveyor belts, in favor of methods which minimize this tendency.（由于分离存在的危险，像是溜槽和传送带这样以前常用的运输方法已经被淘汰了，而采用最小化这种趋势的方法）

大多数建筑混凝土从搅拌机或卡车到模板内的输送是由底部卸料吊斗或由泵通过钢管完成的。输送中的主要危险是骨料离析。由于混凝土的成分的互异性所以容易发生离析。处于容器或模型中的过渡潮湿的混凝土，其中较重的砾石组分易于沉降，较轻的材料特别是水容易上浮。横向运动，例如模具内的流动容易将粗砂砾与混合物的较细成分分开。离析的风险使得人们废弃了之前经常采用的输送方式例如溜槽和传送带而采用使离析风险最小的方法。

Placing and Compacting of Concrete

Placing is the process of transferring the fresh concrete from the conveying device to is final place in the forms. Prior to placing, loose rust must be removed from reinforcement, forms must be cleaned, and hardened surfaces of previous concrete lifts must be cleaned and treated appropriately. Placing and compacting are critical in their effect on the final quality of the concrete. Proper placement must avoid segregation, displacement of forms or of the reinforcement in the forms, and poor bond between successive layers of concrete. Immediately upon placing, the concrete should be compacted by means of hand tools or vibrators. Such compacting prevents honeycombing, assures close contact with forms and reinforcement, and serves as a partial remedy to possible prior segregation. Compacting is achieved by hand tamping with a variety of special tools, but now more commonly and successfully with high frequency, power-driven vibrators. These are of the internal type, immersed in the concrete, or of the external type, attached to the forms. The former are preferable but must be supplemented by the latter where narrow forms or other obstacles make immersion impossible.

浇筑是将新拌好的混凝土通过输送装置输送到其在模具中的最终位置的过程。在浇筑之前，必须清除钢筋上的浮锈，清洁模具，对于以前的混凝土吊车的硬化表层也必须进行适当的处理和清洁。浇筑和捣实对混凝土的最终质量有重要的影响。正确的浇筑必须避免离析，模具或模具内钢筋的位移以及相继浇筑的混凝土层之间的不牢固粘接。浇筑后应立即用手工工具或振捣器将混凝土捣实。捣实是为了防止变成蜂窝状，确保混凝土与模具和钢筋紧密接触，也是对之前可能产生离析的一个部分补救。捣实以前是使用各种特殊工具手动夯实来实现的，而现在更普遍和成功地采用高频率的电动振捣器来完成。浸入混凝土中的是内部形式，附着在模具上的是外部形式。前者是更期望的但是由于狭窄的部分或其他障碍物不可能浸没，所以后者肯定存在。