Research On Dynamic Mechanical Properties Of Alkali Resistant Glass Fiber Concrete

Nowadays,terrorism is becoming more and more fierce in some parts of the world.Terrorists often use explosive means to attack important building structures,and there are not a few cases of structural collapse caused by terrorist explosions.Statistics show that overpasses and overpasses around the world are hit by vehicles when they are built,resulting in loss of life and property.Large Bridges can be hit by ships,or even collapse.At the same time,the world is prone to natural disasters.Various natural disasters such as tsunami,earthquake,landslide and debris flow will also produce the impact of dynamic load on the building structure.As one of the materials commonly used in engineering structures,it is necessary to study the dynamic properties of concrete for its application in practical engineering.Alkali resistant glass fiber has good tensile resistance,bending resistance,impact resistance,and corrosion resistance.In this paper,alkali-resistant glass fiber is selected as the reinforcement material to be mixed into concrete,so as to study its influence on the static and dynamic properties of concrete,and explore the possibility of application of this material in resisting dynamic load in engineering.In this test,alkali resistant glass fiber with length of 24 mm was selected to be incorporated into concrete.The benchmark strength was C30,and the dosage was set as the volume fraction of 0%,0.5%,1.0% and 1.5%.Standard cube specimens of150mm×150mm×150mm are made for static compression and splitting test,and cylindrical specimens of φ120mm×100mm are made for SHPB compression and splitting test.Through data collection,data analysis and theoretical analysis,the conclusions are as follows:(1)Incorporation of alkali-resistant glass fiber into concrete does improve the static and dynamic strength of concrete,but it does not linearly increase with the increase of the dosage.When the dosage increases to 1.5%,the reinforcement effect of the fiber on concrete is better than that on the compressive strength.(2)The test results show that the integrity of the specimen after failure is improved by different mixing amounts.In the dynamic index analysis,the peak stress increases with the increase of strain rate,while the peak strain has no correlation with the fiber content.In the analysis of energy parameters,the energy dissipation/incident energy of codoped specimens increases with the increase of strain rate.