ABSTRACT

This study investigated the effect of using calcium carbonate (CaCO₃) nanoparticles on the microstructural properties, flexural strength and fracture toughness of ceramic nanomaterials. The flexural strength and fracture toughness were evaluated for CaCO₃ nanoparticle contents of 1%, 2%, and 3% by weight of cement powder. The microstructural analyses from X-ray diffraction showed that nano-CaCO₃ improved the microstructure of nanocomposites because it reduces the tricalcium silicate and dicalcium silicate peaks and increases the calcium silicate hydrate products. Moreover, the results showed that the nanocomposites with 1 wt% nano-CaCO₃ exhibited the maximum flexural strength and fracture toughness compared to the other composites owing to the filler and nucleation effect of nano-CaCO₃. In addition, nano-CaCO₃ could resist the unstable micro-crack propagation in cement nanocomposites by filling the micro-cracks and voids. Future applications in synthesis or steel fiber-reinforced concrete or ceramic nanocomposites could benefit from the use of the analyses presented in this study.

摘要

这项研究调查了使用碳酸钙（CaCO ₃）纳米粒子对陶瓷纳米材料的微观结构特性，弯曲强度和断裂韧性的影响。对于CaCO ₃纳米颗粒含量为水泥粉末重量的1％，2％和3％，评估了挠曲强度和断裂韧性。X射线衍射的微观结构分析表明，纳米CaCO ₃改善了纳米复合材料的微观结构，因为它降低了硅酸三钙峰和硅酸二钙峰，并增加了水合硅酸钙产物。此外，结果表明具有1wt％的纳米CaCO ₃的纳米复合材料。由于纳米CaCO ₃的填充和成核作用，与其他复合材料相比，其表现出最大的弯曲强度和断裂韧性。另外，通过填充微裂纹和空隙，纳米CaCO ₃可以抵抗水泥纳米复合材料中微裂纹的不稳定传播。合成或钢纤维增强混凝土或陶瓷纳米复合材料的未来应用可受益于本研究中提供的分析。