摘要
为研究不同掺量纳米SiO_(2)、PVA纤维对水泥基材料静动态力学性能的影响,开展了纳米SiO_(2)砂浆、PVA纤维砂浆及纳米SiO_(2)-PVA纤维复合砂浆的抗压和抗折强度及抗冲击性试验,基于双参数威布尔分布对纳米SiO_(2)-PVA纤维砂浆的冲击次数和冲击耗能进行分析.结果表明:PVA纤维体积掺量为1.0%且纳米SiO_(2)掺量为1.8%时是最佳复合掺量,此时纳米SiO_(2)-PVA纤维砂浆的抗压和抗折强度相较于NC砂浆分别提高了8.4%和32%,初裂和破坏冲击耗能分别提升了833.3%和1160.0%.PVA纤维掺入会导致砂浆的抗压强度低于NC砂浆,但是显著提升了初裂和破坏冲击耗能.纳米SiO_(2)和PVA纤维能充分发挥协同效应提升基体的密实性,PVA纤维的桥联作用及纳米SiO_(2)的增强作用,使水化产物覆盖并填充在由于PVA纤维掺入所形成孔隙中,细化了孔隙形态并延缓裂缝发展,并建立了不同失效概率下纳米SiO_(2)-PVA纤维砂浆的冲击次数和冲击耗能预测模型.
To study the effects of SiO_(2) and PVA fibers on the static and dynamic mechanical properties of cement-based materials,the compressive strength,flexural,and impact resistance tests of Nano-SiO_(2) mortar,PVA fiber mortar,and Nano-SiO_(2)-PVA fiber mortar were carried out.The impact number and impact energy of Nano-SiO_(2)-PVA fiber mortar were analyzed based on a two-parameter Weibull distribution.The results showed that the volume content of PVA fiber is 1.0 vol.%and the Nano-SiO_(2) is 1.8%,the compressive strength and flexural strength of Nano-SiO_(2)-PVA fiber mortar are increased by 8.4%and 32%,respectively.Compared with ordinary mortar,the energy consumption of initial cracking and damage impact of Nano-SiO_(2)-PVA fiber mortar is increased by 833.3%and 1160.0%,respectively.Although the addition of PVA fibers reduce the compressive strength of mortar,it significantly increases the energy consumption of initial cracking and damage impact.Nano-SiO_(2) and PVA fiber exert a synergistic effect that improve the compactness of the matrix.Due to the bridging effect of PVA fiber and the filling effect of Nano-SiO_(2),the matrix pores formed by PVA fibers are filled by the hydration products,refining pore morphology and delaying crack propagation.Furthermore,the impact times and impact energy consumption prediction models of Nano-SiO_(2)-PVA fiber mortar with different failure probabilities are established.
作者
陈晨
陈圣钊
韦京利
粟俊驰
陈正
CHEN Chen;CHEN Sheng-zhao;WEI Jing-li;SU Jun-chi;CHEN Zheng(School of Railway Engineering,Liuzhou Railway Vocational Technical College,Liuzhou 545007,China;School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China)
出处
《兰州理工大学学报》
北大核心
2026年第1期23-32,共10页
Journal of Lanzhou University of Technology
基金
广西高校中青年科研基础能力提升项目(2023KY1451,2022KY1400)
广西杰出青年科学基金项目(2022GXNSFFA035035)。
