摘   要：研究了竹纤维的掺量（0、0.1%、0.5%）和长度（0、7.5、22.5 mm）对轻骨料混凝土（Lightweight aggregate concrete，LAC）抗压强度的影响。采用离散元方法从细观层次上模拟了竹纤维增强LAC的单轴抗压性能，揭示了竹纤维的作用机制。结果表明：随着竹纤维掺量和长度的增加，LAC的抗压强度均呈先增大后减小的趋势，最佳掺量和长度分别为0.1%和7.5 mm；建立的离散元模型能够较好地模拟竹纤维增强LAC的单轴抗压性能；竹纤维增强LAC中的接触类型有基质间接触、基质-骨料界面接触、骨料间接触、基质-纤维界面接触、纤维间接触。Abstract: The influence of bamboo fiber content (0, 0.1%, 0.5%) and length (0, 7.5, 22.5 mm) on the compressive strength of lightweight aggregate concrete (LAC) was studied. The discrete element method was used to simulate the uniaxial compressive performance of bamboo fiber reinforced LAC at the microscopic level, and the action mechanism of bamboo fiber was revealed. The results show that with the increase of bamboo fiber content and length, the compressive strength of LAC shows a trend of first increasing and then decreasing. The optimal content and length are 0.1% and 7.5 mm, respectively. The established discrete element model can simulate the uniaxial compressive performance of bamboo fiber reinforced LAC well. The contact types in bamboo fiber reinforced LAC include matrix to matrix contact, matrix-aggregate interface contact, aggregate to aggregate contact, matrix-fiber interface contact, and fiber to fiber contact.

朱然.基于离散元方法的竹纤维增强轻骨料混凝土单轴抗压性能模拟研究[J].混凝土与水泥制品,2026(2):27-33. ZHU R.Simulation study on uniaxial compressive performance of bamboo fiber reinforced lightweight aggregate concrete based on discrete element method[J].China Concrete and Cement Products,2026(2):27-33.

摘   要：研究了玄武岩纤维掺量（0~0.3%）和MgO膨胀剂掺量（0~6%）对混凝土抗压强度和劈裂抗拉强度的影响，并采用极差分析法确定了二者的最佳掺量。结果表明：复掺适量玄武岩纤维和MgO膨胀剂可以显著提高试件的抗压强度、劈裂抗拉强度和抗裂性能；当玄武岩纤维掺量为0.1%或0.2%时，随着MgO膨胀剂掺量的增加，试件的抗压强度、劈裂抗拉强度和开裂时间均呈先增后降的趋势；当玄武岩纤维掺量为0.3%时，随着MgO膨胀剂掺量的增加，试件的抗压强度和开裂时间先增后降，而劈裂抗拉强度逐渐降低；当MgO膨胀剂掺量一定时，随着玄武岩纤维掺量的增加，试件的抗压强度、劈裂抗拉强度和开裂时间均下降；与MgO膨胀剂掺量相比，玄武岩纤维掺量对试件抗压强度的影响更显著，而对劈裂抗拉强度和开裂时间的影响较弱；综合考虑力学性能和抗裂性能，玄武岩纤维和MgO膨胀剂的最佳掺量分别为0.1%和6%。研究成果可为大体积混凝土、水工混凝土等对抗裂性能有较高要求的工程提供技术参考。Abstract: The effects of basalt fiber content (0~0.3%) and MgO expansion agent content (0~6%) on the compressive strength and splitting tensile strength of concrete were studied, and the optimal content of both was determined using range analysis method. The results indicate that the addition of an appropriate content of basalt fiber and MgO expansion agent can significantly improve the compressive strength, splitting tensile strength, and crack resistance of the specimens. When the content of basalt fiber is 0.1% or 0.2%, with the increase of MgO expansion agent content, the compressive strength, splitting tensile strength, and cracking time of the specimen show a trend of first increasing and then decreasing. When the content of basalt fiber is 0.3%, with the increase of MgO expansion agent content, the compressive strength and cracking time of the specimen show a trend of first increasing and then decreasing, while the splitting tensile strength gradually decreases. When the content of MgO expansion agent is constant, the compressive strength, splitting tensile strength, and cracking time of the specimen decrease with the increase of basalt fiber content. Compared with the MgO expansion agent content, the effect of basalt fiber content on the compressive strength of specimens is more significant, while its effect on the splitting tensile strength and cracking time is weaker. Taking into account both mechanical properties and crack resistance, the optimal contents of basalt fiber and MgO expansion agent are 0.1% and 6%, respectively. The research results can provide technical references for engineering projects with high requirements for crack resistance, such as mass concrete and hydraulic concrete.

欧时舜,熊英建,何茂,等.玄武岩纤维与MgO膨胀剂对混凝土力学及抗裂性能的影响[J].混凝土与水泥制品,2026(2):34-39. OU S S,XIONG Y J,HE M,et al.The influence of basalt fiber and MgO expansion agent on the mechanical properties and crack resistance of concrete[J].China Concrete and Cement Products,2026(2):34-39.

敬淼淼,沙亮.硅灰对聚丙烯-钢混杂纤维混凝土抗冻性能和力学性能的影响研究[J].混凝土与水泥制品,2026(2):40-44. JING M M,SHA L.Study on influence of silica fume on the frost resistance and mechanical properties of polypropylene-steel hybrid fiber reinforced concrete[J].China Concrete and Cement Products,2026(2):40-44.