Experimental Study on Fluidity and Strength of Fiber-reinforced Cement-based Filling Paste with Multi-scale Regulation
In order to improve the mechanical properties of cement-based filling paste,glass,polypropylene and polyacry-lonitrile fibers were used as modified materials.The influence of fiber type and dosage on the physical and flow properties of ce-ment-based filling paste was discussed,and the strengthening mechanism of fiber on the physical properties of cement-based filling paste was revealed.The results show that the slump of filling slurry decreases gradually with the increase of fiber con-tent,but the fiber type has no significant effect on the slump of slurry.The compressive strength of filling body increases signifi-cantly with the increase of fiber content,and the change of fiber type has no significant effect on the compressive strength.With the increase of fiber content,the 28 d tensile strength of the sample shows an increasing trend,and the increase of 28 d tensile strength is much higher than that of 28 d compressive strength.Polyacrylonitrile fiber has the highest enhancement effect on tensile strength,followed by polypropylene fiber,and glass fiber has the least enhancement effect on tensile strength.The sur-face of glass fiber is attached with obvious hydration products,indicating that the fiber and mortar will form obvious cohesion,which can significantly improve the macro mechanical properties of filling paste.
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