In this study, the effects of micro-steel fiber, pelletized fly ash lightweight aggregate and microsilica content on the fresh and hardened properties of high-performance cementitious composite (HPCC) were experimentally investigated. Micro-steel fibers having a length of 6 mm were used in the production of mixtures at the level of 0%, 1% and 2% by total volume. Besides, artificial lightweight aggregate produced by the pelletizing method was employed in the mixture production by 0% and 20% of total aggregate volume. 0% and 25% of the total binder content were designated as microsilica. Thus, a total of 12 different HPCC mixtures were obtained. The water-to-binder ratio of 0.2 was chosen in the design of all HPCC mixtures. A high-rate water-reducing chemical admixture is used to give a suitable flow for the fresh mixtures. The mechanical properties of HPCC mixtures are evaluated in terms of compressive and flexural strengths and elastic modulus. In addition to these, total water absorption and capillary water absorption tests were performed to evaluate the pore structure and permeability. The drying and autogenous shrinkage values were determined during the 60-day drying period. Thus, the effects of fiber content, microsilica addition, and artificial lightweight aggregate content were examined. The results of the experiment showed that the mechanical properties of HPCC and shrinkage behavior have been improved with the increase of steel fiber volume fraction. Furthermore, the negative effects of artificial lightweight aggregate can be eliminated by microsilica.

在这项研究中，实验研究了微钢纤维，粉煤灰颗粒轻质骨料和微硅含量对高性能胶凝复合材料（HPCC）的新鲜和硬化性能的影响。在混合物的生产中使用长度为6mm的微钢纤维，其含量按总体积计为0％，1％和2％。此外，在混合物生产中，采用通过造粒法生产的人造轻质骨料，其总量为总骨料体积的0％和20％。总粘合剂含量的0％和25％被称为微二氧化硅。因此，总共获得了12种不同的HPCC混合物。在所有HPCC混合物的设计中，水与粘合剂之比选择为0.2。使用高减水率的化学外加剂可为新鲜混合物提供合适的流量。根据抗压强度，抗弯强度和弹性模量评估HPCC混合物的机械性能。除此之外，还进行了总吸水率和毛细管吸水率测试，以评估孔隙结构和渗透性。在60天的干燥期间测定干燥和自发收缩值。因此，检查了纤维含量，微二氧化硅添加量和人造轻质骨料含量的影响。实验结果表明，随着钢纤维体积分数的增加，HPCC的力学性能和收缩行为得到改善。此外，微二氧化硅可以消除人造轻质骨料的负面影响。除此之外，还进行了总吸水率和毛细管吸水率测试，以评估孔隙结构和渗透性。在60天的干燥期间测定干燥和自发收缩值。因此，检查了纤维含量，微二氧化硅添加量和人造轻质骨料含量的影响。实验结果表明，随着钢纤维体积分数的增加，HPCC的力学性能和收缩行为得到改善。此外，微二氧化硅可以消除人造轻质骨料的负面影响。除此之外，还进行了总吸水率和毛细管吸水率测试，以评估孔隙结构和渗透性。在60天的干燥期间测定干燥和自发收缩值。因此，检查了纤维含量，微二氧化硅添加量和人造轻质骨料含量的影响。实验结果表明，随着钢纤维体积分数的增加，HPCC的力学性能和收缩行为得到改善。此外，微二氧化硅可以消除人造轻质骨料的负面影响。因此，检查了纤维含量，微二氧化硅添加量和人造轻质骨料含量的影响。实验结果表明，随着钢纤维体积分数的增加，HPCC的力学性能和收缩行为得到改善。此外，微二氧化硅可以消除人造轻质骨料的负面影响。因此，检查了纤维含量，微二氧化硅添加量和人造轻质骨料含量的影响。实验结果表明，随着钢纤维体积分数的增加，HPCC的力学性能和收缩行为得到改善。此外，微二氧化硅可以消除人造轻质骨料的负面影响。