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Updated: Jun 13, 2025

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在不同高温暴露后,低更换率飞混凝土的损坏和恢复行为

Lin Mi1,2, Bowen Kuang1,2, Daixin Fu1,2

  • 1Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu 610207, China.

Materials (Basel, Switzerland)
|September 14, 2024
PubMed
概括

这项研究检查了火灾损坏的飞灰混凝土 (FAC). 由于pozzolanic反应,火灾后固化有助于在400°C恢复强度,但较高的温度和低的FAC含量限制了长期耐用性.

关键词:
压力强度的压力强度是什么飞行灰飞行灰是什么意思暴露于高温的高温暴露微观结构的微观结构火灾后的治愈火灾后的治愈

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Fatigue Strength of Concrete

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Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
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Hot Weather Concreting

Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
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Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
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