“alkali aggregate expansion”是指碱骨料反应，它是指混凝土中的碱性物质与骨料发生化学反应，导致混凝土膨胀、开裂甚至破坏的现象。在混凝土施工中，需要采取一定的措施来控制碱骨料反应，以确保混凝土的质量和耐久性。
以下是一篇关于碱骨料反应的英文范文：
Alkaline Aggregate Expansion
Alkaline aggregate expansion, also known as alkali-aggregate reaction, refers to a chemical reaction between alkaline substances in concrete and aggregate, which causes concrete to expand, crack and even fail. In concrete construction, it is necessary to take certain measures to control alkali-aggregate reaction to ensure the quality and durability of concrete.
Concrete is a mixture of cement, sand, gravel and other materials, and alkaline substances such as calcium oxide and sodium oxide are added to the cement to improve its strength and durability. However, if the aggregate used in the concrete contains certain minerals that react with alkaline substances in the cement, it will cause the concrete to expand and crack, leading to premature failure.
Therefore, it is necessary to carefully select the aggregate used in concrete construction to avoid using materials that can react with alkaline substances. At the same time, it is also necessary to control the amount of alkaline substances added to the cement to avoid excessive expansion of the concrete. In addition, it is also necessary to take measures such as sealing the surface of the concrete to prevent moisture from entering the concrete and promoting the reaction between alkaline substances and aggregate.
In summary, alkali aggregate expansion is a common problem in concrete construction that needs to be carefully controlled to ensure the quality and durability of concrete.
“alkali aggregate expansion”是指碱骨料反应，这是一种混凝土中的化学反应，当混凝土中的碱性物质与骨料中的某些成分反应时，可能会导致混凝土膨胀并开裂。
在英文范文的相关信息中，关于“alkali aggregate expansion”的描述可能包括：
1. 反应的条件：例如高碱性的混凝土和某些特定的骨料。
2. 反应的结果：膨胀和可能的开裂。
3. 反应的影响：反应可能导致混凝土结构的破坏，特别是在恶劣环境下，如潮湿和盐雾环境中。
4. 预防措施：一些技术措施，如使用低碱水泥，选择合适的骨料，以及在混凝土中加入一些添加剂，可以降低碱骨料反应的风险。
请注意，这些只是一些一般性的信息，具体的描述和解释可能因文章来源和语境而异。如果你有特定的英文范文需要帮助，请提供更多信息，我会尽力提供更准确的解释。
“alkali aggregate expansion”是指混凝土在碱环境中，由于碱性物质的存在而引起的膨胀。这种现象通常发生在混凝土中加入含有碱的骨料时，会导致混凝土膨胀并可能损坏混凝土结构。
在英文范文最新变化中，“alkali aggregate expansion”可能会被写作“alkali-aggregate expansion”、“agglomerate expansion”或“aggregate expansion due to alkali”等。具体使用哪种表达方式取决于语境和作者的偏好。