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首页> 外文会议>Fifth ACI International Conference on Innovations in Design with Emphasis on Seismic, Wind, and Environmental Loading; Quality Control and Innovations in Materials/Hot-Weather Concreting Dec, 2002 Cancun, Mexico >Extreme Concrete
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Extreme Concrete

机译：极限混凝土

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摘要

The durability and permeability of concrete are of special concern in the Arabian Gulf due to the prevailing aggressive weather conditions. Very few practical examples showing the ability of the local ready-mixed industry to adapt to extreme hot weather, characteristic of this region of the world, have been exposed and analyzed. The following paper describes extreme concrete properties in two particular projects in Saudi Arabia demonstrating how the local concrete industry has used specific measures to produce high-performance concrete in very hot weather. In the first project concrete was hauled for 8 hours in hot weather using high dose of standard retarders and superplasticisers and following rigorous measures to control the mix temperature. In the second project high-strength high-performance concrete was hauled for 45 minutes at an ambient temperature of 40℃and achieved 24 hours strength in excess of 50 MPa. It is concluded that controlling the temperature of fresh concrete in hot weather should be primarily based on parameters related to cost, workability retention and long-term strength. Besides, the cited examples demonstrated how the use of admixtures in hot weather could be very beneficial even if the dosage considered did not comply with ASTM C 494 requirements and the manufacturer standard recommendations.
机译：由于盛行的恶劣天气条件，在阿拉伯海湾，混凝土的耐久性和渗透性受到特别关注。很少有实际的例子可以说明和分析本地预拌工业适应世界极端气候的能力。以下论文描述了沙特阿拉伯两个特定项目中的极端混凝土性能，说明了当地混凝土行业如何使用特定措施在炎热的天气下生产高性能混凝土。在第一个项目中，在高温天气下，使用大剂量的标准缓凝剂和高效减水剂将混凝土拖运8小时，并采取严格的措施控制混合温度。在第二个项目中，在40℃的环境温度下将高强度高性能混凝土牵引45分钟，并获得超过50 MPa的24小时强度。结论是，在炎热天气下控制新鲜混凝土的温度应主要基于与成本，可维护性和长期强度有关的参数。此外，引用的实施例表明，即使所考虑的剂量不符合ASTM C 494要求和制造商标准建议，在炎热天气下使用掺合料也将是非常有益的。

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