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隧道衬砌混凝土碳化试验及影响因素研究

, PP. 72-77

Keywords: 隧道工程,混凝土碳化,灰关联分析,变系数碳化模型,应力状态,水灰比

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Abstract:

?对某高速公路隧道衬砌混凝土进行了快速碳化试验,探讨了应力状态、应力水平及水灰比对混凝土碳化的影响规律,建立了变碳化系数多因素碳化模型,并对碳化影响因素进行了灰关联分析。结果表明:拉、压应力分别加快和减缓了混凝土的碳化速率,且应力水平越高,碳化速率的改变越大;碳化速率随水灰比的增加而加快;碳化系数并不是常数,而是随碳化龄期呈现明显的时变特性;碳化龄期对碳化深度影响最大,应力水平影响次之,而水灰比影响最小。

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