论文部分内容阅读
本文主要研究不同掺量的硅灰、聚合物以及两者的复合物对钢纤维与水泥墓材界面性状的影响。实验结果表明,随着硅灰、聚合物掺量的提高,界面组成和结构得到调整与改善:界面层的弱谷变浅,Ca(OH)_2的取向性减弱和富集现象变小,其性状与基体逐渐接近。保持流动性不变,在基体中掺入15%聚丙烯(AP)或12%聚丙烯乙脂乳胶(PAE),界面最薄弱层显微硬度可提高到4—5倍。保持水灰比不变,以硅灰取代0—20%水泥,随硅灰掺量提高界面性状与墓体差异减小。特别当复合掺入15%AP和20%硅灰时,界面最薄弱层显微硬度与基体几乎相等,界面层弱谷消失,H_(?)-d曲线趋向于一水平线,Ca(OH)_2晶体的取向性减至最弱且富集现象消失。钢纤维增强水泥基材的增强,增韧和阻裂能力均有大幅度提高。
In this paper, we mainly study the effects of different dosages of silica fume, polymers and their composites on the interface properties of steel fiber and cement grave. The experimental results show that with the increase of silica fume and polymer content, the interface composition and structure are adjusted and improved: the weak valleys of the interface layer become lighter, the orientation of Ca(OH)2 decreases and the enrichment phenomenon becomes smaller. The trait gradually approaches the matrix. Keeping fluidity constant, blend 15% polypropylene (AP) or 12% polypropylene glycol (PAE) in the matrix. The micro-hardness of the weakest layer at the interface can be increased to 4-5 times. Keeping the water-cement ratio unchanged, silica fume replaces 0-20% of the cement, and the difference between interface properties and burial body decreases with increasing silica fume content. Especially when 15% AP and 20% silica fume were compounded, the microhardness of the interface weakest layer was nearly equal to that of the matrix, the weak valleys of the interface layer disappeared, and the H_(-)-d curve tended to a horizontal line, Ca(OH)_2 The orientation of the crystal is reduced to the weakest and the enrichment disappears. The strength, toughness, and crack resistance of steel fiber reinforced cement substrates have been greatly improved.