Forming test mold and method for chopped fiber-cement-based material test piece

Abstract

the invention relates to a forming test mold and method for the chopped fiber-cement-based material test piece. The test mold is characterized in that four straight edges of a lower test mold and fourstraight edges of an upper test mold in the test mold form a rectangular frame body, and cross sections of the lower test mold and the upper test mold are the same; the lower test mold is fixed on anupper surface of the base; the upper test mold is arranged on the lower test mold, the upper test mold is fixedly connected with the lower test mold, and the center of the upper test mold frame bodyis located over the center of the lower test mold frame body; the method comprises steps of step 1, coating release agent on the lower test mold and a base, pouring a cement-based material into an upper end of the lower test mold, leveling and flattening; 2, extending the chopped fibers into an upper surface of the cement-based material, then fixing the upper test mold coated with the release agent to an upper surface of the lower test mold, and pouring the cement-based material into an upper end of the upper test mold to be flush with an upper end of the upper test mold and then flattening; 3, after molding for 20-24 h, detaching the upper test mold, and taking out the molded chopped fiber-cement-based material test piece. The method is advantaged in that a real interface state can be better reflected, the structure is simple, manufacturing is convenient, and practicability is stronger.

Description

technical field [0001] The invention belongs to the technical field of road materials, in particular to a forming test mold and method for a chopped fiber-cement-based material test piece. Background technique [0002] During the forming process of pavement concrete, shrinkage cracks will appear due to factors such as environmental changes or unreasonable material design and construction. These early cracks will further expand under the coupling effect of late load and environment, reducing the durability of pavement concrete. In engineering, the addition of fiber has been taken as an important means of crack resistance and toughening modification of concrete, which has reached a consensus in the engineering circles at home and abroad. At present, the fibers used in modified cement concrete are mostly basalt fibers, steel fibers, glass fibers and carbon fibers. When these chopped fibers are used in cement-based materials, they can co-deform with cement-based materials under...

AI Technical Summary

Problems solved by technology

However, the current bond strength test is to form the cement-based specimen first, and then artificially insert the chopped fiber into the specimen. This method is greatly affected by human factors, destroying the integrity of the specimen, and cannot truly reflect the state of the interface between the two.

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