多尺度纤维复合增强水泥基材料的力学性能

为改善水泥基材料抗拉强度低、韧性差以及易开裂等性能缺陷，采用微米级碳酸钙晶须和厘米级短切耐碱玻璃纤维复合增强高性能水泥基材料，并对不同纤维增强水泥基材料的基本力学性能进行研究。结果表明：微观碳酸钙晶须和宏观耐碱玻璃纤维均有利于水泥基材料力学性能的提高，且提高程度与纤维（或晶须）掺量及长度相关；采用碳酸钙晶须和耐碱玻璃纤维复合增强水泥基材料，可分别在微、宏观结构层次上发挥两种纤维的增强优势，增强水泥基材料的抗折和劈拉强度比未增强时最多可分别提高约60%和80%。

Mechanical properties of multi-scale fiber compound reinforced cement-based materials

In order to improve the performance deficiency of cement-based materials such as low tensile strength, poor toughness and easy cracking, the basic mechanical properties of cement-based materials reinforced by micron grade CaCO₃ whisker and centimeter-grade short AR-glass fiber were studied by testing. The results show that the mechanical properties of reinforced cement-based material can be improved by the proper addition of CaCO₃ whisker and/or AR-glass fiber, and the improvement degree is related to the content and length of fibers. For the cement-based materials compound reinforced with CaCO₃ whisker and AR-glass fiber, the improvement of mechanical properties of the cement-based materials can be explained that the reinforcing roles of the two kinds of fibers can be played at the micro and macro structural levels respectively, and the flexural and tensile strength of reinforced cement-based materials can be increased by up to 60% and 80% compared with that of non-reinforced cement-based materials.