This study quantifies the results of the thermal conductivity for cement-based foam reinforced with polypropylene fibers and correlates the influence with pozzolans, porosity, moisture content, and pore parameters. Here, the mixtures were prepared for the densities range of 400–800 kg/m 3 in which cement was replaced in the ratios of 10% and 20% (by weight) with fly ash, silica fume, and metakaolin. Along with pozzolan, polypropylene micro-fibers were added at the volume fraction of 0.2%. The thermal conductivity was measured variously at the hydration age of 60–210 days by using the transient plane source technique. While the porosity and the pore parameters were evaluated by using X-ray microtomography, a non-destructive technique. The results revealed that polypropylene fibers contributed to reducing the conductivity and among the three pozzolans, fly ash was the most efficient. However, the porosity increases with the inclusion of fibers but drops significantly with the addition of pozzolans, especially for lower densities mixtures. Also, it was found that D50 relates linearly with conductivity. However, based on experiment results, a modified thermal conductivity predictive model for cement-based foam reinforced with fiber was developed.

中文翻译：

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聚丙烯纤维增强水泥基泡沫导热系数评价

本研究量化了用聚丙烯纤维增强的水泥基泡沫的热导率结果，并将其与火山灰、孔隙率、水分含量和孔隙参数的影响相关联。在这里，混合物的制备密度范围为 400-800 kg/m 3，其中水泥以 10% 和 20%（按重量计）的比例用粉煤灰、硅粉和偏高岭土代替。与火山灰一起，添加了体积分数为 0.2% 的聚丙烯微纤维。通过使用瞬态平面源技术，在 60-210 天的水合龄期测量了不同的热导率。而孔隙率和孔隙参数是通过使用非破坏性技术 X 射线显微断层扫描来评估的。结果表明，聚丙烯纤维有助于降低电导率，并且在三种火山灰中，粉煤灰的效率最高。然而，孔隙率随着纤维的加入而增加，但随着火山灰的加入而显着下降，特别是对于较低密度的混合物。此外，还发现 D50 与电导率呈线性关系。然而，根据实验结果，开发了一种改进的纤维增强水泥基泡沫导热系数预测模型。