摘要
为了增强基础设施结构的安全性与耐久性,将短切玄武岩纤维掺入混凝土中进行改性处理。通过开展系列力学试验,细致分析了在不同短切玄武岩纤维掺量和养护时间条件下,试件的抗压、抗折强度与变形特征的变化规律,并经微观形貌观察对纤维增强混凝土的内在机理进行深入探讨。研究发现:短切玄武岩纤维的强化作用显著提升了混凝土的抗压强度与延展性;养护时间的延长使得纤维增强混凝土强度逐渐增长,尤其在初始养护的7d内增长迅速;混凝土的抗压强度和破坏应变随着短切玄武岩纤维掺量的增加呈现先上升后下降的变化趋势,当短切玄武岩纤维掺量为0.8%时,混凝土的强度与破坏应变达到峰值,超出此掺量后力学性能降低;由微观图像发现,混凝土强度增长的内在机理主要是短切玄武岩纤维在试件内部起到桥接裂缝与缓冲整体失稳的作用。
To enhance the safety and durability of the infrastructure,the chopped basalt fibers mixed with sprayed concrete in modification.By carrying out a series of mechanical tests,the changes of compressive strength,flexural strength and deformation characteristics of concrete under different basalt fiber content and curing time are analyzed in detail,and the modification mechanism of short-cut basalt fiber increase is deeply discussed through microscopic morphology observation.The results show that the addition of chopped basalt fiber significantly improves the compressive strength and ductility of concrete.With the extension of curing time,the strength of basalt fiber reinforced concrete gradually decreases,especially in the first 7 days.In addition,the compressive strength and failure strain of basalt fiber reinforced concrete show a trend of first increasing and then decreasing with the increase of fiber content.When the basalt fiber content is 0.8%,the strength and failure strain of concrete reach a peak value,and the mechanical properties decrease after exceeding it.The chopped basalt fiber plays an important role in bridging cracks and buffering overall instability in concrete.
出处
《浙江建筑》
2025年第4期34-37,共4页
Zhejiang Construction
