自密实PVA-ECC早期开裂性能试验研究

发布时间：2018-05-12 12:08

本文选题：自密实 + PVA-ECC　；参考：《混凝土》2017年12期

【摘要】：为研究纤维体积掺量对自密实聚乙烯醇纤维增强水泥基复合材料(自密实PVA-ECC)早期抗裂性能的影响,基于分形理论分析了自密实PVA-ECC表面裂缝的分布特性,提出了约束状态下裂缝扩展模型。结果表明:掺入纤维使得自密实PVA-ECC试件表面裂缝更少、短、细,可有效抑制其表面早期裂缝的产生和扩展;掺0.1%纤维试件表面最大裂缝宽度及总开裂面积较未掺纤维试件分别降低28.41%、28.61%,纤维掺量增至0.4%时,试件表面无可见裂缝;自密实PVA-ECC试件表面早期裂缝分布具有分形特征;所提出的裂缝扩展模型能很好地预测自密实PVA-ECC早期收缩开裂规律,计算误差不超过6%。
[Abstract]:In order to study the effect of fiber volume content on the early crack resistance of self-compacting polyvinyl alcohol fiber reinforced cement matrix composites (PVA-ECCs), the surface crack distribution characteristics of self-compacting PVA-ECC were analyzed based on fractal theory. A crack propagation model under constraint state is proposed. The results show that the surface cracks of self-compacting PVA-ECC specimens are less, shorter and finer due to the addition of fiber, which can effectively inhibit the formation and expansion of early cracks on the surface. The maximum crack width and total crack area of 0.1% fiber doped specimen are 28.41% and 28.61% lower than those of the undoped fiber specimen respectively. When the fiber content increases to 0.4%, there is no visible crack on the surface of the specimen, and the early crack distribution of self-compacting PVA-ECC specimen has fractal characteristics. The proposed crack propagation model can well predict the early shrinkage cracking law of self-compacting PVA-ECC, and the calculation error is less than 6.
【作者单位】：大连海事大学道路与桥梁工程研究所;
【基金】：国家自然科学基金资助项目(51578099)
【分类号】：TU528

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