reactive aggregates

简明释义

活性骨料

英英释义

例句

1.When mixed with water, reactive aggregates can lead to unexpected expansion in concrete structures.

与水混合时，反应性骨料可能导致混凝土结构意外膨胀。

2.The presence of reactive aggregates can significantly affect the lifespan of a pavement.

存在反应性骨料会显著影响路面的使用寿命。

3.The construction industry often uses reactive aggregates to enhance the durability of concrete.

建筑行业常常使用反应性骨料来增强混凝土的耐久性。

4.In regions prone to alkali-silica reaction, identifying reactive aggregates is crucial.

在易发生碱硅酸反应的地区，识别反应性骨料至关重要。

5.Engineers must test for reactive aggregates to prevent damage in long-term projects.

工程师必须测试反应性骨料以防止长期项目中的损坏。

作文

In the field of materials science, the term reactive aggregates refers to specific types of aggregates that can undergo chemical reactions when exposed to certain conditions, particularly in concrete. These aggregates are not inert; instead, they actively participate in chemical processes that can affect the durability and overall performance of the concrete structure. One common example of reactive aggregates is silica, which can react with the alkalis present in cement to form a gel that expands over time, leading to cracking and deterioration of the concrete. This phenomenon is known as alkali-silica reaction (ASR). Understanding the implications of using reactive aggregates is crucial for engineers and architects. When designing concrete structures, it is essential to assess the potential reactivity of the aggregates being used. Failure to do so can lead to significant structural issues down the line, including reduced lifespan and increased maintenance costs. In many cases, construction professionals conduct tests to determine the reactivity of aggregates before they are included in a mix design. To mitigate the risks associated with reactive aggregates, various strategies can be employed. One effective approach is to use low-alkali cement, which minimizes the availability of alkalis that can react with the aggregates. Additionally, incorporating pozzolanic materials, such as fly ash or slag, can help to consume the alkalis and reduce the likelihood of ASR. Another strategy involves selecting non-reactive aggregates or those that have been treated to ensure they will not react adversely in the presence of alkalis. The importance of understanding reactive aggregates extends beyond just the technical aspects of concrete mixing. It also has economic implications. The cost of repairing or replacing structures affected by ASR can be substantial, not to mention the potential safety hazards posed by compromised infrastructure. Therefore, investing time and resources into proper testing and selection of aggregates can save money and ensure the longevity of the structures built. In conclusion, reactive aggregates play a significant role in the performance of concrete structures. Their ability to engage in chemical reactions can have detrimental effects if not properly managed. By conducting thorough assessments and adopting appropriate mitigation strategies, construction professionals can help ensure the integrity and durability of their projects. As the field of materials science continues to evolve, ongoing research into the behavior of reactive aggregates will be critical for developing more resilient construction practices and materials.

在材料科学领域，短语反应性骨料指的是在特定条件下可以发生化学反应的特定类型的骨料，特别是在混凝土中。这些骨料不是惰性的；相反，它们在化学过程中积极参与，这可能会影响混凝土结构的耐久性和整体性能。一个常见的反应性骨料示例是二氧化硅，它可以与水泥中的碱反应，形成一种在时间上膨胀的凝胶，从而导致混凝土开裂和退化。这种现象被称为碱-硅反应（ASR）。了解使用反应性骨料的影响对于工程师和建筑师至关重要。在设计混凝土结构时，评估所用骨料的潜在反应性是必不可少的。如果不这样做，可能会导致显著的结构问题，包括使用寿命缩短和维护成本增加。在许多情况下，建设专业人士会在将骨料纳入混合设计之前进行测试，以确定其反应性。为了减轻与反应性骨料相关的风险，可以采用各种策略。一种有效的方法是使用低碱水泥，这样可以最小化与骨料反应的碱的可用性。此外，加入火山灰或矿渣等火山灰材料可以帮助消耗碱，并减少ASR的可能性。另一种策略是选择非反应性骨料或经过处理以确保它们在碱存在时不会产生不利反应的骨料。理解反应性骨料的重要性不仅限于混凝土配比的技术方面。它也具有经济影响。由于ASR影响的结构修复或更换的成本可能相当可观，更不用说受损基础设施带来的潜在安全隐患。因此，在适当的测试和骨料选择上投资时间和资源可以节省资金，并确保所建结构的持久性。总之，反应性骨料在混凝土结构的性能中发挥着重要作用。它们参与化学反应的能力如果不加以管理，可能会产生不利影响。通过进行彻底的评估并采用适当的缓解策略，建设专业人士可以帮助确保其项目的完整性和耐久性。随着材料科学领域的不断发展，对反应性骨料行为的持续研究对于开发更具韧性的建筑实践和材料至关重要。