过火石灰对常用建筑材料性能有何影响?如何避免其危害? -题库考试答案搜索网

过火石灰对常用建筑材料性能有何影响?如何避免其危害?

问答题

2022-04-02 18:27

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正确答案

(1)水泥混合砂浆或石灰砂浆的抹灰层中含有过火石灰颗粒时,它会吸收空气中的水分缓慢熟化,体积膨胀,致使墙面隆起、开裂,严重影响施工质量;(2)水泥中如含有过火石灰,会导致安定性不良。
因此,对于砂浆中使用的石灰膏,必须经过“陈伏”处理。由于过火石灰表面常被粘土杂质融化形成的玻璃釉状物包覆,熟化很慢。若未经充分陈伏,当石灰已经硬化后,过火石灰才开始熟化,并产生体积膨胀,极易引起鼓包隆起和开裂。而对于含有过火石灰而导致安定性不良的水泥,要避免用于工程。

试题解析

标签：桂林理工大学工程造价高起专建筑材料

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