陶瓷-尼龙纤维水泥基复合材料力学性能研究

Mechanical Properties of CeramicNylon HybridFibre Cement Composites

研究了单一陶瓷纤维、单一尼龙纤维及陶瓷尼龙混杂纤维水泥基复合材料的力学性能．结果表明：单一陶瓷纤维在３％体积掺量时，２８ｄ抗压强度可提高４４％左右，抗折强度可提高７％～８％，抗冲强度可提高约１６％；０．０５％体积掺量的尼龙纤维使砂浆干缩开裂减小３０％～４０％；０．５％～２％体积掺量的尼龙纤维使砂浆抗冲强度提高到２～３倍．陶纤和尼纤体积掺量分别为２％～３％和０．２５％～１％的混杂纤维水泥基复合材料在拌和物流动性可取的情况下抗压、抗折、抗冲综合性能较好．

The mechanical properties of monoceramic, mononylon and ceramicnylon hybrid fibre cement composites were tested. The results of experiments showed that when ceramic fibre was added to mortar with the volume fraction of 3%, the compression strength could be improved by about 44%, flexural strength could be improved by 7%～8%, impact strength could be improved by about 16%, when the volume fraction of nylon fibre was 0.5%～2%, the impact strength of mortar was improved by 2～3 times. Compared to the normal cement mortar, the crack by drying shrinkage of nylon fibre reinforced cement mortar was reduced by 30%～40% at the fibre content even as low as 0.05%. The optimum comprehensive properties of compression, flexural, impact strength with feasible workability could be gained by 2%～3% of ceramic fibre and 0.25%～1% of nylon fibre respectively in hybrid fibre cement composites.