纳米粒子和钢纤维增强混凝土抗冲击性能研究

STUDY ON IMPACT RESISTANCE OF NANOPARTICLE AND STEEL FIBER REINFORCED CONCRETE

通过落锤冲击试验,得到了纳米粒子和钢纤维增强混凝土的初裂冲击次数、破坏冲击次数和冲击能差,并以这3个参数作为评价指标,研究纳米SiO_(2)粒子和钢纤维对混凝土抗冲击性能的影响。结果表明,在一定掺量范围内,随着纳米SiO_(2)掺量的增加,混凝土的初裂冲击次数、破坏冲击次数和冲击能差呈现先增大后减小的趋势,当纳米SiO_(2)掺量为2%时,混凝土的抗冲击性能表现最好。在本文试验钢纤维掺量范围内,随着钢纤维掺量的增加,混凝土的初裂冲击次数、破坏冲击次数和冲击能差先增大后减小,当钢纤维掺量为2%时,混凝土的抗冲击性能表现最为优越。掺纳米SiO_(2)的混凝土在冲击破坏时仍表现为脆性破坏,而钢纤维的掺加使混凝土在破坏时表现出了一定的韧性。本文试验所得到的混凝土抗冲击性能规律为纳米SiO_(2)粒子和钢纤维增强混凝土的应用提供了参考。

Through the drop weight impact test,the initial cracking impact times,failure impact times and impact energy difference of nano-particles and steel fiber reinforced concrete were obtained,and these three parameters were used as evaluation indicators to study the effect of nano-SiO_(2)particles and steel fibers on concrete.impact resistance.The results show that within a certain dosage range,with the increase of nano-SiO_(2)content,the initial cracking impact times,failure impact times and impact energy difference of concrete first increase and then decrease.When the nano-SiO_(2)content is 2%,the impact resistance of concrete is the best.Within the range of steel fiber content tested in this paper,with the increase of steel fiber content,the initial cracking impact times,failure impact times and impact energy difference of concrete first increased and then decreased.When the steel fiber content was 2%,The impact resistance of concrete is the best.Concrete mixed with nano-SiO_(2)still showed brittle failure when impact failure,while the addition of steel fiber made the concrete show a certain toughness during failure.The law of concrete impact resistance obtained by the experiment in this paper provides a reference for the application of nano-SiO_(2)particles and steel fiber reinforced concrete.