Effect of Basalt Fiber on the Strength of Volcanic Slag Lightweight Aggregate Concrete
Lightweight aggregate concrete has been widely utilized in civil engineering fields such as high-rise buildings and large-span structures due to its characteristics of lightweight,high strength,thermal insulation,and corrosion resistance.However,it also exhibits issues such as susceptibility to cracking,high brittleness,and insuffi-cient toughness.This study explores the influence of basalt fibers on the mechanical properties of volcanic scoria lightweight aggregate concrete was studied by fiber modification methods and analyzes its toughening mechanism.Experimental results indicate that the toughness of volcanic scoria lightweight aggregate concrete significantly improves with the increase of basalt fiber content.Notably,when the basalt fiber content reaches 3‰,the com-pressive strength of the concrete increases by 2%,while the flexural strength improves significantly by 33.4%,achieving the optimal fiber content point.Furthermore,observations through scanning electron microscopy(SEM)reveal enhanced bonding performance between basalt fibers and the cement paste interface,along with reduced porosity,thereby improving the density and stability of the concrete.
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