Application of non-destructive integrated CT-XRD method to investigate alteration of cementitious materials subjected to high temperature and pure water
Application of non-destructive integrated CT-XRD method to investigate alteration of cementitious materials subjected to high temperature and pure water
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DOI：
10.1016/j.conbuildmat.2019.01.128
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发表时间：
2019-04
影响因子：
7.4
通讯作者：
Hayato Takahashi;T. Sugiyama
中科院分区：
文献类型：
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作者：
Hayato Takahashi;T. Sugiyama
为了分析不同最高温度和纯水浸泡后的蚀变机理，采用无损集成CT-XRD方法（以下简称CT-XRD）。首先，对CT-XRD进行验证，并与常规粉末x射线衍射进行比较。结果表明，CT-XRD可以在一定的低能带范围内对晶体进行评价。此外，CT-XRD在常规粉末XRD制备粉末样品时，可以检测到研磨后无法检测到的晶体的存在。然后，分别在200、400、600和800 °C下加热，然后浸泡在纯水中，用CT-XRD对碳化水泥浆体进行评价。结果表明，400 ℃时试样的抗浸出能力最强。此外，虽然水化产物很容易溶解于水中，但在800 ℃下加热产生的熟料矿物仍存在再水化现象。
In order to analyze the alteration mechanism after the exposure to various maximum temperatures and immersion in pure water, non-destructive integrated CT-XRD method (the CT-XRD) was applied. Firstly, the verification of the CT-XRD was carried out to compare with conventional powder X-ray diffraction. It revealed that the CT-XRD could evaluate the crystals properly with a given limitation for low energy band. Besides, the CT-XRD indicated the advantage that can detect the presence of crystals which cannot be detected after grinding in preparing the powder sample for the conventional powder XRD. Then, the carbonated cement paste that was heated at 200, 400, 600, and 800 °C followed by immersion in pure water was evaluated by the CT-XRD. The results suggest that sample heated at 400 °C showed the resistance of leaching at most. In addition, rehydration of clinker minerals generated due to heating at 800 °C could be identified although the hydration product was easily dissolved into water.