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In order to study how to correctly apply the two different time dependencies to service life prediction models, the definition of parameters in the time dependent equation using the long-term test method and the short-term test method, and its relationship were discussed. The experimental results show that, as the two time dependencies have different meanings, they have different manners when handled in service life prediction models. Time dependency of chloride diffusion coefficients in concrete was obtained by fitting experimental data. A large number of accurate experimental data were required to fit the formula of time dependency to ensure the accuracy of service life prediction model. 相似文献
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本文针对采油厂天然气产量下降供不应求的问题,提出了“阶梯式”储气供气方式,供配气管网“树枝状”建设,压缩天然气供应小区用气方式等措施,在一定程度上缓解了天然气目益尖锐的供需矛盾,增加了外供气量。 相似文献
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为制备干硬性再生混凝土,设计了专用加压成型装置和成型工艺,利用正交试验方法设计配合比,对混凝土不同龄期的抗压强度进行测试。试验结果表明,制备的干硬性再生混凝土试件成型效果理想,且前期强度增长较快,当水胶比取0.3、再生粗骨料取代率取50%、砂率取45%、成型压力取10kPa时,试件的力学性能较优。 相似文献
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