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首页> 美国卫生研究院文献>Materials >Numerical Modelling of the Effect of Filler/Matrix Interfacial Strength on the Fracture of Cementitious Composites
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Numerical Modelling of the Effect of Filler/Matrix Interfacial Strength on the Fracture of Cementitious Composites

机译：填料/基体界面强度对水泥基复合材料断裂影响的数值模拟

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摘要

The interface between filler and hydration products can have a significant effect on the mechanical properties of the cement paste system. With different adhesion properties between filler and hydration products, the effect of microstructural features (size, shape, surface roughness), particle distribution and area fraction of filler on the fracture behavior of a blended cement paste system is supposed to be different, as well. In order to understand the effect of the microstructural features, particle distribution and area fraction of filler on the fracture behavior of a blended cement paste system with either strong or weak filler-matrix interface, microscale simulations with a lattice model are carried out. The results show that the strength of the filler-matrix interface plays a more important role than the microstructural features, particle distribution and area fraction of filler in the crack propagation and the strength of blended cement paste. The knowledge acquired here provides a clue, or direction, for improving the performance of existing fillers. To improve the performance of fillers in cement paste in terms of strength, priority should be given to improving the bond strength between filler particles and matrix, not to modifying the microstructural features (i.e., shape and surface roughness) of the filler.
机译：填料和水合产物之间的界面可能对水泥浆体系的机械性能产生重大影响。由于填料与水合产物之间的粘合性能不同，因此，水泥的微结构特征（尺寸，形状，表面粗糙度），填料的颗粒分布和面积分数对混合水泥浆体系断裂行为的影响也应有所不同。为了了解微观结构特征，填料的颗粒分布和面积分数对具有强或弱填料-基质界面的混合水泥浆体系的断裂行为的影响，进行了具有格状模型的微观模拟。结果表明，填料-基体界面的强度在裂纹扩展和掺合水泥浆的强度方面比填料的微观结构特征，颗粒分布和面积比更重要。此处获得的知识为改善现有填料的性能提供了线索或方向。为了在强度方面改善水泥浆中填料的性能，应优先考虑提高填料颗粒与基体之间的粘结强度，而不是改变填料的微观结构特征（即形状和表面粗糙度）。

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