【摘要】 水泥基复合材料均为抗拉性能低的脆性物质.加入随机分布的纤维会显著提高其断裂强度.素混凝土在加入纤维后会破坏原有的颗粒状骨架并降低配合物的和易性,使纤维混凝土的施工产生困难.针对配合初始和硬化后两种状态,提出钢纤维混凝土全新的配合优化设计过程,给出了考虑纤维、外加物、水及水泥用量后和易性与时间的关系.研究了根据该优化方法所制得的试件在受压和受弯下的力学性能,并证明它比Swamy法更为优越.更多还原

【Abstract】 Cement matrix composite is fragile and possesses very low tensile strength.Addition of steel fibers randomly distributed in the matrix can enhance the fracture strengths.Granular skeleton of plain concrete can be destroyed by the incorporation of fibers and the workability of the admixture can be reduced significantly.This physical phenomenon can leads to a difficulty in concrete construction.Aiming at both the fresh and hardened state of the mixture,a new optimization method for steel fiber reinforced concrete was proposed.Also the relationship between workability and flow time was examined by taking account of some parameters,e.g.volumes of fibers,admixture,water and cement.The optimized specimens show superior compression and flexibility.It indicates that this method is better than the Swamy method.更多还原