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长沙地区湘江砂卵石的碱活性及安全使用条件

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Abstract:

采用岩相法和快速砂浆棒法对长沙地区湘江的湘阴段、望城段和湘潭段3个河段砂卵石的碱活性进行了试验研究。岩相分析的结果表明这3个河段的砂卵石的矿物组成没有明显差异,卵石主要由硅质石英岩和杂砂岩组成,砂主要由石英、长石、云母和杂砂岩组成,卵石和砂中的杂砂岩均含有一定量的隐晶石英和微晶石英。快速砂浆棒法测试的结果表明这3个河段的砂卵石均具有碱活性。研究了粉煤灰和矿粉对卵石和砂碱-骨料反应膨胀的抑制效果,并首次使用正交设计法研究,得到了水泥-粉煤灰-矿粉三元胶凝体系中安全的胶凝组分区域。

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