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混凝土

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 Besides its ability to sustain loads, concrete is also required to be durable. The durability of concrete can be defined as its resistance to deterioration resulting from external and internal causes. The external causes include the effects of environmental and service conditions to which concrete is subjected, such as weathering, chemical actions and wear. The internal causes are the effects of salts, particularly chlorides and sulphates, in the constituent materials, interaction between the constituent materials, such as alkali aggregate reaction, volume changes, absorption and permeability.
In order to produce a durable concrete care should be taken to select suitable constituent materials. It is also important that the mix contains adequate quantities of materials in proportions suitable for producing a homogeneous and fully compacted concrete mass.
它的能力承受装载, 混凝土并且必需是耐久的。混凝土的耐久性可能被定义作为它的对恶化的抵抗起因于外在和内部起因。外在起因包括混凝土被服从环境和服务情况的作用, 譬如风化、化工行动和穿戴。内部起因是盐, 特殊氯化物的作用和硫化, 在构成材料, 互作用在构成材料之间, 譬如碱聚集体反应、容积变化、吸收和渗透性。
为了导致耐久的具体注意应该被采取选择适当的构成材料。它还重要, 混合包含材料的充分数量在比例适当为生产同类和充分地变紧密的具体马萨诸塞。

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