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Method for Rapidly Evaluating Soft Water Erosion Resistance of Hydraulic Inorganic Cementitious Materials

An inorganic cementitious material and hydraulic technology, which is applied in the analysis of materials, material analysis by electromagnetic means, instruments, etc., can solve the problem that the ability of materials to resist soft water erosion, the representativeness of results, accuracy and repetition cannot be quickly evaluated. The problems of poor performance and lack of objectivity of test results can achieve the effect of reducing the requirements of test site and maintenance conditions, saving test time and low test cost.

Active Publication Date: 2019-08-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this test method has the shortcomings of long test period and time-consuming, and cannot quickly evaluate the ability of the material to resist soft water erosion.
At the same time, the test process has high technical requirements for the operator, the human factor is large, and the objectivity of the test results is insufficient, resulting in poor representativeness, accuracy and repeatability of the results.

Method used

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  • Method for Rapidly Evaluating Soft Water Erosion Resistance of Hydraulic Inorganic Cementitious Materials
  • Method for Rapidly Evaluating Soft Water Erosion Resistance of Hydraulic Inorganic Cementitious Materials
  • Method for Rapidly Evaluating Soft Water Erosion Resistance of Hydraulic Inorganic Cementitious Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The actual test results based on this method show that the judgment result of the water resistance coefficient I on the soft water erosion resistance of hydraulic inorganic gelling materials is consistent with the judgment result of the softening coefficient K. According to the interpretation of the material softening coefficient K in "Civil Engineering Materials" edited by Zhao Fangran (Zhao Fangran. Civil Engineering Materials. Shanghai: Tongji University Press, first edition, 2011:20-21), "the softening coefficient K of the material > 0.85 It shows that it has good resistance to soft water erosion and can be used for important structures in water or humid environments; while the softening coefficient K<0.75 of the material indicates that its ability to resist soft water erosion is poor and can only be used for light damp or secondary structures. To structure."

[0074] We use magnesium oxychloride cement (MC), Portland cement (PII), ordinary Portland cement (PO), rap...

Embodiment 2

[0080] In embodiment two, adopt the method of the present invention to evaluate the anti-soft water erosion ability of certain phosphate slag cement (PSA) in 24.6 ℃ environment:

[0081] Step 1. Slurry preparation and loading:

[0082] Take about 3000g of phosphate rock slag cement and pour it on a metal tray, spread it gently with a scraper, then place it in an electric blast drying oven, and dry it at 150°C for 24 hours until it is finally weighed repeatedly. The fluctuation of slag cement quality is about 0.8%.

[0083] Then accurately weigh 800g from the fully dried phosphate slag cement as a sample for testing. Accurately weigh 300g of distilled water according to 0.38 times the mass of the sample, and then make a slurry according to the method specified in "Cement Standard Consistency Water Consumption, Setting Time, and Stability Test Methods" (GB / T 1346-2011).

[0084] The slurry is introduced into the ring mold 20 and vibrated while loading. The whole process is com...

Embodiment 3

[0096] In Example 3, the method of the present invention is used to evaluate the anti-soft water erosion ability of a composite cement used as a composite cementitious material in an environment of 28.6 ° C after high-mixing fly ash and stone powder:

[0097] Step 1. Slurry preparation and loading:

[0098] Take about 5000g of composite gelling material and pour it on a metal tray, spread it gently with a scraper, then place it in an electric blast drying oven, and dry it at a temperature of 105°C for 48 hours until it is weighed repeatedly at the end. The fluctuation of slag cement quality is around 1.2%.

[0099] 600g was accurately weighed from the fully dried composite gelled material as a sample for testing. Accurately weigh 270g of deionized water according to 0.45 times the mass of the sample, and then make a slurry according to the method specified in "Cement Standard Consistency Water Consumption, Setting Time, and Stability Test Methods" (GB / T 1346-2011).

[0100] ...

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Abstract

The invention provides a method for rapidly, conveniently and efficiently evaluating soft water erosion resistance capability of a hydraulic inorganic cementing material. The method comprises steps asfollows: a to-be-evaluated material is put in a drying box and dried at the temperature of 105-150 DEG C; the dried material is taken as a sample, the sample and distilled water are stirred and mixed, and slurry is prepared; the slurry is rapidly poured into a mold with vibration until the heights of all parts of the slurry are basically consistent; a proper amount of distilled water is slowly injected along the side wall of the mold, and the mold is sealed; the well sealed mold is put in an incubator, and the temperature is well set; the mold is wound with an excitation coil and an inductioncoil, signal transmitting and acquisition devices are well connected, and the incubator is sealed; the change condition of inductance Z and the phase phi of the slurry within 10 min-24 h after distilled water is injected are measured; the corresponding water resistance coefficient I is calculated according to the acquired inductance Z and phase phi of the slurry in the simulated actual service temperature environment at the specific time.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for quickly evaluating the soft water erosion resistance of hydraulic inorganic gelling materials in different temperature environments. [0002] technical background [0003] At present, concrete produced with cement as the cementitious material is the most widely used material on earth except water. It is often used to build infrastructure such as dams, high-speed railways, highways, bridges, and tunnels. Cement is also used to prepare various Mortar and cement concrete products with different properties and uses. According to statistics in 2015, the world's cement consumption has reached 3.9 billion tons, and China's cement production has reached 2.1 billion tons. [0004] Soft water erosion resistance generally refers to the ability of a material to maintain its mechanical strength in water or a humid environment. Around the definition of water resistan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04G01N27/00
Inventor 汤盛文李杨余晨何真蔡新华
Owner WUHAN UNIV
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