摘要
为研究风积砂玄武岩纤维混凝土的力学性能,通过对一批试块的力学性能试验,研究不同风积砂取代率对玄武岩纤维混凝土抗压强度、劈裂抗拉强度、抗压弹性模量等力学性能的影响规律;并利用核磁共振(NMR)和单晶X-射线衍射(XRD)研究玄武岩纤维风积砂混凝土的孔隙结构和水化反应,分析了风积砂对玄武岩纤维混凝土力学性能的作用机理。试验结果表明:风积砂的适量掺入对玄武岩纤维混凝土的抗压强度影响明显,弹性模量、劈裂抗拉强度均有提升;在各试块中,玄武岩纤维掺量为0.15%,风积砂取代率为20%时试块的力学性能最优;当取代率适当时,风积砂的填充效应及其提供的碱性环境能够促进水化反应,优化混凝土的孔隙率,从而提高混凝土的强度。
In order to study the mechanical properties of aeolian sand basalt fiber concrete,through the mechanical performance test of a batch of test blocks,the effect of different aeolian sand replacement rate on the basalt fiber concrete compressive strength,splitting tensile strength,compressive elastic modulus,etc.The influence law of mechanical properties;and using nuclear magnetic resonance(NMR)and single crystal X-ray diffraction(XRD)to study the pore structure and hydration reaction of basalt fiber aeolian sand concrete,and analyze the effect of aeolian sand on the mechanical properties of basalt fiber concrete mechanism of action.The test results show that the appropriate amount of aeolian sand has a significant impact on the splitting tensile strength of basalt fiber concrete,and the elastic modulus and compressive strength are both improved.In each test block,the basalt fiber content is 0.15%,the mechanical properties of the test block are optimal when the replacement rate of aeolian sand is 20%.When the replacement rate is appropriate,the filling effect of aeolian sand and the alkaline environment it provides can promote the hydration reaction,optimize the porosity of the concrete,and thus increase the strength of concrete.
作者
王尧鸿
王峰
李志强
霍光宗
张宇
WANG Yaohong;WANG Feng;LI Zhiqiang;HUO Guangzong;ZHANG Yu(Civil Engineering College,InnerMongolia technology University,Hohhot 010051,China;Main Labof Civil Engineering Structure and Mechanics,Inner Mongolia Autonomous Region,Hohhot 010051,China;School of Water Conservancy and Construction Engineering,Shihezi University,Shihezi 832003,China)
出处
《混凝土》
CAS
北大核心
2023年第3期116-119,125,共5页
Concrete
基金
国家自然科学基金(51868059)。
关键词
风积砂
玄武岩纤维
混凝土
力学性能
孔隙结构
aeolian sand
basalt fiber
concrete
mechanical properties
pore structure
