Device and construction method using sea sand as concrete fine aggregate

Abstract

The invention discloses a device and a method for performing construction by taking marine sand as concrete fine aggregates. The device comprises a direct-current power supply and a template (1), wherein a sliding groove is formed in the inner surface of the template (1); a stainless steel plate (3) is arranged at the bottom of the sliding groove; a drawer plate is arranged in the sliding groove in a sliding-fit manner; a positive electrode of the direct-current power supply is connected with the stainless steel plate (3) through a lead wire; and a negative electrode of the direct-current power supply is connected with a steel reinforcement cage (8) of a concrete structure (6) through a lead wire. The method comprises the following key steps: pouring and tamping the concrete aggregates; waiting for 2-4 days, pulling out the drawer plate and sealing an opening of the sliding groove with a seal strip (5), so that the surface of the concrete structure (6), the seal strip (5) and the sliding groove form a sealed chamber; and filling the chamber with an electrolyte solution (7), so that chlorine ions in the concrete structure (6) are migrated to the electrolyte solution (7). According to the device and method, the chlorine ion concentration of the marine sand can be effectively reduced.

Description

technical field [0001] The invention relates to the field of reinforced concrete durability in coastal areas, in particular to a construction device and construction method using sea sand as concrete fine aggregate. Background technique [0002] Concrete aggregate refers to the granular loose material that acts as a skeleton or filling in concrete. It is divided into coarse aggregate and fine aggregate. Coarse aggregate includes pebbles, crushed stones, waste residue, etc., and fine aggregate includes sand, fly ash Wait. The sand generally adopts freshwater sand such as river sand and lake sand. However, in the vast coastal and island areas, the amount of freshwater sand is limited, while sea sand is abundant. However, there are a large amount of chloride ions in sea sand that are corrosive to steel bars, which will reduce the durability of buildings. So there is a helpless and embarrassing situation. On the one hand, when constructing concrete in coastal and island areas,...

AI Technical Summary

Problems solved by technology

However, in the vast coastal and island areas, the amount of freshwater sand is limited, while sea sand is abundant. However, there are a large amount of chloride ions in sea sand that are corrosive to steel bars, which will reduce the durability of buildings.

So there is a helpless and embarrassing situation. On the one hand, when constructing concrete in coastal and island areas, it takes a lot of manpower and material resources to transport freshwater sand from the inland as fine aggregate; idle, unusable

In order to solve the above problems, some people naturally proposed the idea of ​​using sea sand as fine aggregate, but there is an objective technical problem in this idea, that is, the concentration of chloride ions in sea sand is too large, and it is difficult for the existing sea sand desalination technology to The concentration of chloride ions in sea sand is reduced to a range that meets the safety standards for reinforced concrete structures

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