Fiber-wrapped lightweight aggregateand method for inhibiting floating of lightweight aggregate

Abstract

The invention discloses a fiber-wrapped lightweight aggregate and a method for inhibiting floating of the lightweight aggregate. Pre-wetted lightweight aggregate and fiber are connected into a whole through a small amount of cementing material slurry, a cementing material slurry thin layer with the fiber is formed on the surface of the lightweight aggregate, and the hair-like lightweight aggregate with the fiber is prepared after coagulation and hardening. The lightweight aggregate is used as a novel coarse aggregate to prepare lightweight concrete. Therefore, the floating problem of the lightweight aggregate is effectively solved, and the homogeneity of a test piece is ensured; one end of the fiber on the surface of the lightweight aggregate is embedded and fixed in the thin layer of the cementing material coating the surface of the aggregate, and the other end of the fiber on the surface of the lightweight aggregate is embedded and fixed in concrete slurry, so that the contact area between the aggregate and the cement slurry is increased. Compared with a method of directly adding fibers, the method has the advantages that prepared concrete has larger tensile strength and larger interface bonding strength with the aggregate and cement paste, so that the lightweight aggregate is more effectively prevented from floating upwards.

Description

technical field [0001] The invention relates to a fiber-wrapped lightweight aggregate and a method for suppressing the floating of the lightweight aggregate, belonging to the technical field of concrete. Background technique [0002] Lightweight aggregate concrete refers to concrete that uses lightweight aggregate, and its apparent density is less than 1950kg / m 3 . Commonly used lightweight aggregates include natural lightweight aggregates and artificial lightweight aggregates. Natural lightweight aggregates include pumice and volcanic slag; artificial lightweight aggregates include shale ceramsite, clay ceramsite, and expanded perlite. In addition, some industrial wastes such as Fly ash ceramsite and expanded slag beads can also be used as lightweight aggregate to prepare lightweight aggregate concrete. Because lightweight aggregate concrete has the characteristics of light weight, high strength, thermal insulation, good earthquake resistance, and good deformation perform...

AI Technical Summary

Problems solved by technology

During the pouring process of lightweight aggregate concrete, lightweight aggregate is prone to float up, causing concrete layering and segregation, affecting the workability and durability of fresh concrete, and further affecting the service life of concrete structures and components

In order to effectively control the floating of lightweight aggregates in lightweight concrete, the current Chinese invention patents are "a method for improving the floating of lightweight aggregates in concrete", "lightweight concrete that inhibits the floating of aggregates" and "a kind of anti-floating aggregates" "Lightweight ceramsite concrete and its preparation method" all use the method of adding admixtures to suppress the floating of lightweight aggregates by increasing the consistency of the slurry, but such methods will inevitably affect the concrete construction due to the inability to accurately control the amount of admixtures some impact on performance

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