Layer-by-layer pouring technology for controlling steel fiber distribution direction in steel fiber reinforced concrete

Abstract

The invention belongs to the field of steel fiber concrete preparation, in particular to a layered pouring process for controlling the distribution direction of steel fibers in steel fiber concrete. It includes the following steps: step (1): preparation of cement mortar without adding steel fiber; step (2): preparation of steel fiber concrete; step (3): layered pouring on a vibrating table: placing the specimen mold on a vibrating table On the other hand, vibrating and compacting while pouring layer by layer, each poured layer is manually troweled, so that the steel fibers have in-plane longitudinal orientation in this layer. The process of the invention controls the pouring thickness of each layer through layered pouring, and artificially plasters the parts that cannot be compacted by self-vibration, so as to realize the purpose of controlling the distribution direction of the steel fiber in the plane, and has the characteristics of simplicity and general use. Moreover, the method can effectively control the distribution direction of steel fibers in steel fiber reinforced concrete, which is original and has important practical significance for the preparation and molding of controllable steel fiber reinforced concrete materials.

Description

technical field [0001] The invention belongs to the field of steel fiber concrete preparation, in particular to a layered pouring process for controlling the distribution direction of steel fibers in steel fiber concrete. Background technique [0002] Since the late 20th century, the science of concrete has developed extremely rapidly. Because of its characteristics of easy construction, easy selection of raw materials, good durability, and low price, concrete has become the most important civil engineering material in the contemporary era. However, the defects in the mechanical properties of ordinary cement-based composites (such as low flexural strength, high brittleness, poor ductility, etc.) limit its application, and the addition of steel fibers to concrete can better change this phenomenon. The randomly distributed steel fibers in concrete can effectively prevent the expansion of micro-cracks and the formation of macro-cracks in concrete, significantly improve the tens...

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Problems solved by technology

[0006] However, the research on many documents has found that the addition of steel fibers is chaotic, and the strong tensile properties of steel fibers and the ability to bridge cracks caused by tension cannot be fully utilized. If the tensile direction of the components is consistent, the tensile capacity of the steel fiber can be fully utilized, and the overall performance of the steel fiber reinforced concrete can be greatly improved.

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