Determining device of chloride ion diffusion coefficient in hydrated calcium silicate gel and determining method

Abstract

The invention discloses a determining device of chloride ion diffusion coefficient in a hydrated calcium silicate gel and a determining method, which belongs to the technical field of determining thedurability of concrete structures. The determining device comprises a tank to be tested, a straight tube, a DC (direct current) stabilized power supply, an elbow, a copper rod electrode, an anode testpiece tank and a cathode test piece tank, and the determining method comprises preparation of a test piece to be detected, connection of the determining device, electromigration test and test resultprocessing. The determining method provides a method for preparing a test piece for changing a diffusion path of chloride ions from capillary pores to gel pores, wherein the capillary pores on the surface of the test piece prepared by the method are filled with epoxy resin, the internal capillary pores are in a dry state, and the gel pores of hydrated calcium silicate are in a wet state, so that the chloride ions have wet hydrated calcium silicate gel pores as a main diffusion path during test. The test device disclosed by the invention has a simple and reasonable structure and convenient operation, and can accurately obtain the diffusion coefficient of the chloride ions in the hydrated calcium silicate gel.

Description

Technical field [0001] The invention relates to a measuring device and a measuring method for the chloride ion diffusion coefficient of hydrated calcium silicate gel, and belongs to the technical field of concrete structure durability measurement. Background technique [0002] In coastal areas and cold areas (using deicing salt), the corrosion of steel bars caused by chloride ions is the main reason for the deterioration of the durability of concrete structures. The corrosion of steel bars has caused huge economic losses. Therefore, the resistance of concrete to chloride ion penetration has become an evaluation One of the important indicators of concrete durability. [0003] On the macro scale, concrete can be regarded as the interface transition zone, cement hydrate and aggregate. Among them, the cement hydrate mainly includes hydrated calcium silicate (C-S-H), calcium hydroxide crystal (CH) and sulfate salt. In the past few decades, scholars from all over the world have done a l...

AI Technical Summary

Problems solved by technology

[0004] Technical problem to be solved: the existing measurement technology is only suitable for measuring the chloride ion diffusion coefficient of concrete whose main diffusion path is capillary pores, and cannot accurately measure the chloride ion diffusion coefficient of calcium silicate hydrate gel, and the chloride ion in water The main diffusion path in calcium silicate hydrate gel is gel hole, so the present invention proposes a measuring device and measuring method of chloride ion diffusion coefficient of calcium silicate hydrate gel, the device has the advantages of simple and reasonable structure, flexible application Good performance, low economic cost, simple and convenient operation, etc., the assay method is accurate and effective, and can quickly obtain the diffusion coefficient of chloride ions in calcium silicate hydrate gel

Images