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使用岩相法、砂浆棒法、快速砂浆棒法、x射线衍射分析等多种检验方法对贵广铁路沿线的板岩进行碱活性检验。微观分析显示该地区的板岩含有3%～15%的微晶质至隐晶质石英活性成分。砂浆棒法,快速砂浆棒法试验结果证实了该板岩具有比较高的碱活性。与传统的碱—硅反应膨胀机理不同的是板岩不仅在骨料与水泥浆界面发生碱—硅反应,且由于板岩具有层理结构的特性,外部的碱易沿层理向板岩骨料内部渗透,与骨料内部的活性成分进行反应,从而引起骨料的膨胀开裂。
The alkali activity of slate along the Gui-Guang Railway has been tested by various methods such as rock-phase method, mortar rod method, rapid mortar rod method and X-ray diffraction analysis. Microanalysis shows that slate in the area contains 3% to 15% of microcrystalline to cryptocrystalline quartz actives. Mortar rod method, fast mortar rod test results confirmed that the slate has a relatively high alkali activity. Unlike the traditional alkali-silicon reaction expansion mechanism, slate not only undergoes alkali-silicon reaction at the interface between aggregate and cement slurry, but also because of the layered structure of slate, Material internal infiltration, and the internal components of the aggregate reaction, resulting in the expansion of aggregate cracking.