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Cement self-shrinking value test method

A test method and self-shrinking technology, applied in the direction of material inspection products, etc., can solve problems such as unstable bleeding and air bubbles, large errors, and large fluctuations in test results

Inactive Publication Date: 2007-10-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some researchers put the slurry in sealed soft capsules, and then put the capsules into bottles for testing, but this method not only has large errors, but also complicated operations, requiring vacuuming of the capsules filled with samples, although this is also due to early Bleeding and the air bubbles escaping from the sample in the later stage make the test results fluctuate greatly, because the amount of bleeding and air bubbles is unstable

Method used

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  • Cement self-shrinking value test method
  • Cement self-shrinking value test method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0015] Embodiment 1: the steps are as follows:

[0016] (1) Take a certain amount of cement or a composite material mixed with cement, fly ash, mineral powder, etc., and prepare cement slurry with water according to the designed ratio. The sample to be tested is prepared by molding in a cylindrical container, and the diameter of the cylinder should enable the hardened cement slurry to be loaded into the jar 3 .

[0017] (2) After the cement paste hardens (generally 12 hours to 24 hours after adding water to the cement), the formwork is removed, and the hardened cement paste is sealed with heated and melted paraffin.

[0018] (3) Put the sealed hardened cement slurry into the jar 3, fill the jar 3 with water, plug the cork 2 tightly, add water to the vector tube 1 to the full scale, and then add a drop of liquid Paraffin or other water-insoluble oily liquids are placed on the surface of the water in the measuring tube to prevent evaporation of water.

[0019] (4) Place the de...

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Abstract

The invention relates to a method for testing the contraction value of cement, comprising that shaping cement slurry into a cylinder container according to needed material ratios, using wax to seal solidified cement slurry, using the sealed solidified cement slurry as object sample to be arranged into a vending jar, filling water into the vending jar, adding a plug, dropping water into buret to full, dropping liquid wax or other insoluble oil liquid to the water level of the buret to avoid water evaporation, arranging the device in a standard maintenance room, reading the level initial number when the liquid level is stable, via the scale change, watching the volume contraction rule of slurry, according to the different test periods. Compared with traditional method, the invention can accurately represent the volume change of cement slurry.

Description

technical field [0001] The invention relates to a method for testing the self-shrinkage value of cement. Background technique [0002] The shrinkage of the volume of cement without the influence of external factors during the hardening process is called the self-shrinkage of cement, which includes chemical shrinkage due to cement hydration reaction, drying shrinkage due to internal water consumption, and other factors due to the cement paste itself. The contraction produced by the factor. Since more than 70% of the autogenous shrinkage occurs in the early days within 7 days, the test of cement autogenous shrinkage usually begins to record the initial volume value in a short time after adding water to the cement. At this time, the cement slurry is in the plastic stage. Hardened structure, so the volume shrinkage is mainly manifested in the reduction of the overall volume without causing damage such as structural cracking, but if the self-shrinkage is not compatible with the ...

Claims

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Application Information

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IPC IPC(8): G01N33/38
Inventor 朱洪波王培铭康明
Owner TONGJI UNIV
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