Use of High Volumes of Fly Ash to Improve ECC Mechanical Properties and Material Greenness
Use of High Volumes of Fly Ash to Improve ECC Mechanical Properties and Material Greenness
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DOI：
10.14359/18966
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发表时间：
2007-11
影响因子：
1.7
通讯作者：
E. Yang;Yingzi Yang;V. Li
中科院分区：
文献类型：
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作者：
E. Yang;Yingzi Yang;V. Li
在本报告中，高性能纤维增强水泥基复合材料（HPFRCC）的发展考虑到了环境可持续性。独特的HPFRCC构件具有高拉伸延展性，大量粉煤灰（HVFA）取代水泥（高达85%重量），是工程水泥基复合材料（ECC）。虽然材料设计过程中看到微观力学在其许多方面的应用，本研究强调粉煤灰含量如何改变材料的微观结构和力学性能。虽然它们包含高回收粉煤灰量，HVFA ECC在实验结果中显示能够保持约2%至3%的长期拉伸延展性。值得注意的是，随着粉煤灰量的增加，自由干燥收缩和裂缝宽度都有所减少，尽管如此，HVFA ECC结构的长期耐久性可能会受益。细观力学分析表明，HVFA ECC的纤维/基体界面摩擦结合力的增加是导致致密裂纹宽度的主要原因。使用工业废物流材料代替水泥减少了对环境的影响，并实现了更饱和的多重开裂，这意味着HVFA ECC的鲁棒性得到了改善。
Environmental sustainability considerations are taken into account in this report on high-performance fiber-reinforced cementitious composite (HPFRCC) development. Featuring high tensile ductility with high volumes of fly ash (HVFA) replacement of cement (up to 85% by weight), unique HPFRCC members are engineered cementitious composites (ECC). While the material design process sees application of micromechanics in many of its aspects, this study emphasizes how fly ash content alters material microstructure and mechanical properties. While they incorporate high recycled fly ash volumes, HVFA ECCs are shown in experimental results to be able to retain an approximately 2 to 3% long-term tensile ductility. Significantly, there is reduction in both free drying shrinkage and crack width with a fly ash amount increase, though which HVFA ECC structures' long term durability may benefit. That HVFA ECCs' fiber/matrix interface frictional bond increase is responsible for tight crack width is indicated through micromechanics analysis. Use of industrial waste stream material instead of cement reduces environmental impact and achieves more saturated multiple cracking, meaning a robustness improvement is shown in HVFA ECCs.