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首页> 外文期刊>Journal of Materials Engineering and Performance >Cracking in Calcium Aluminate Cement Pastes Induced at Different Exposure Temperatures
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Cracking in Calcium Aluminate Cement Pastes Induced at Different Exposure Temperatures

机译：在不同曝光温度下诱导的铝酸钙水泥浆料中的开裂

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摘要

Different formulations of calcium aluminate cement (CAC) pastes containing 51 and 71 wt.% Al2O3 were exposed to high-temperature environments so that the damage suffered under different thermal conditions could be studied. Samples had water-to-cement (W/C) ratios of 0.25, 0.30 and 0.40. Both the raw cement powders and their corresponding hydrated samples were characterized using scanning electron microscopy, x-ray diffraction (with Rietveld refinement), Fourier-transform infrared spectroscopy and x-ray fluorescence. All samples were exposed to oxidative environments for 1 h at 500, 800 and 1000 degrees C in a furnace with an air atmosphere. Hot samples were slowly cooled down in order to avoid the damage induced by thermal contraction. The damage that occurred while the samples were in the furnace and exposed to high temperatures could then be analyzed. The damage was examined by digital image analysis and the length of the cracks was fitted to Weibull distributions using Monte Carlo simulations.
机译：将含有51和71重量％的铝酸钙水泥（CAC）浆料的不同配方暴露于高温环境，以便可以研究不同热条件下遭受的损害。样品具有0.25,0.30和0.40的水 - 水泥（w / c）比率。使用扫描电子显微镜，X射线衍射（用RIETVELD细化），傅里叶变换红外光谱和X射线荧光，表征原料水泥粉末及其相应的水合样品。将所有样品在具有空气气氛的炉中以500,800和1000摄氏度暴露于氧化环境1小时。缓慢冷却热样以避免热收缩引起的损伤。然后可以分析样品在炉中发生并暴露于高温的损伤。通过数字图像分析检查损坏，使用Monte Carlo仿真安装裂缝的长度。

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