Optimization of Anti-Permeability Formula and Analysis of Anti-Permeability Mechanism of Fiber Concrete
The anti-permeability performance of concrete directly affects its durability and service life.Fibers mainly play a role in enhancing and toughening concrete,reducing its permeability and the formation of shrinkage cracks,thereby improving the overall anti-permeability,du-rability,and service life of concrete.This study optimized the anti-permeability formula of fiber concrete through a four-factor,three-level or-thogonal experiment and studied the anti-permeability mechanism of fiber concrete.The optimal process formula combination of fiber concrete obtained from the orthogonal experiment was A2 B2 C2 D2,which refers to 15%(wt)fly ash,15%(wt)mineral powder,6%(wt)expansion a-gent,and 1.2 kg/m3 cellulose fiber.Low-field nuclear magnetic resonance spectroscopy analysis showed that the incorporation of fly ash and mineral powder can effectively reduce the small pore area,while the incorporation of cellulose fiber reduces the medium pore area.The re-search results indicate that the incorporation of fly ash,mineral powder,expansion agent,and cellulose fiber can effectively improve the anti-permeability performance of concrete.Reasonable addition of admixtures can effectively improve the anti-permeability performance of concrete.The relevant research results of this study can provide basic data and micro-mechanism references for researchers and engineering technicians in the construction field.
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