Rapid test method for measuring intrusion depth of sulfate ion in recycled concrete test piece

A technology of sulfate ion and recycled concrete, which is applied in the direction of measuring devices, color/spectral characteristic measurement, instruments, etc., to achieve the effect of fast and convenient test methods and broad application prospects

Inactive Publication Date: 2019-05-07
孙峰
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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of the existing methods for determining the degree of sulfate erosion of recycled concrete specimens, and provide a rapid test method for the penetration depth of sulfate ions in recycled concrete specimens

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  • Rapid test method for measuring intrusion depth of sulfate ion in recycled concrete test piece
  • Rapid test method for measuring intrusion depth of sulfate ion in recycled concrete test piece

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[0024] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments are only for better understanding of the technical solution of the present invention, rather than limiting the protection scope of the present invention.

[0025] A kind of quick determination test method of sulfate ion penetration depth in recycled concrete specimen, comprises the following steps:

[0026] Step 1: Standardize the sodium sulfate solution standard curve. Weigh 1.4786g of anhydrous sodium sulfate with an analytical balance, dissolve in a small amount of pure water and make up to 1000ml. At this point, 1.00 ml of the solution contained 1.00 mg of sulfate ion. Take 0.00, 0.25, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 4.00, 6.00, 8.00 and 10.00ml of sulfate standard solution, add them to 50ml colorimetric tubes, add distilled water to 25ml, add 2.5mol / l Hydrochloric acid 2.5m...

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Abstract

The invention discloses a rapid test method for measuring intrusion depth of sulfate ion in a recycled concrete test piece. The test method comprises the following steps: calibrating a standard curveof a sodium sulfate solution; fitting a standard solution curve equation; slicing the recycled concrete test piece and grinding into powder; using a spectrophotometer to determine the absorbance of the solution prepared by the sample powder; and substituting the measured absorbance into the standard solution curve equation to calculate the sulfate ion content, thereby defining the intrusion depthof the sulfate ion. The test method is fast, convenient, simple and reliable, has broad application prospect and little affect by external environmental factors, and can quantitatively characterize the depth of sulfate ion intrusion into the recycled concrete test piece.

Description

technical field [0001] The invention relates to the technical field of measuring the sulfate erosion degree of recycled concrete, in particular to a test method for quickly measuring the penetration depth of sulfate ions in recycled concrete specimens. Background technique [0002] Concrete structures are inevitably corroded by external sulfate media during long-term service. Sulfate ions react with cement hydration products to form expansive corrosion products, which cause concrete to expand, crack and damage, seriously affecting the safety and service life of concrete structures. Compared with ordinary concrete, recycled concrete is more severely attacked by sulfate due to its raw material composition characteristics. [0003] Compared with natural aggregates, the quality of recycled aggregates is poor (multi-angular, high water absorption, high porosity, etc.); and the presence of recycled aggregates attached to old mortar makes multiple weak interface structures inside t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N21/33
Inventor 孙峰王峰赵清香张中华
Owner 孙峰
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