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Cement chemical shrinkage test device and method

A technology of chemical shrinkage and testing equipment, which is applied in the direction of material inspection products, etc., can solve the problems that the chemical shrinkage value cannot be measured, the shrinkage value cannot be measured, and the complexity of the operation is increased, so as to achieve complete test results, large test time range, The effect of short operating time

Inactive Publication Date: 2015-04-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that a specific water-cement ratio can be selected for testing, but the measured value is actually the volume shrinkage of the hardened cement paste, and the shrinkage value of the cement before hardening cannot be measured
In general, various test methods increase the complexity of the operation, increase the operating time, and cannot measure the early chemical shrinkage value of the cement after adding water

Method used

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  • Cement chemical shrinkage test device and method
  • Cement chemical shrinkage test device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, the steps are as follows:

[0026] (1) Insert a No. 8 syringe needle into the "0" scale end of a 5ml glass graduated tube, and fix and seal the needle and the graduated tube with epoxy resin. After the epoxy resin is solidified, first inject a drop of engine oil into the glass scale tube through the needle, and then pour water into the glass scale tube to the full scale. Then fix the glass scale tube vertically on the bracket.

[0027] (2) Weigh 50g of cement, put it into a 50ml glass syringe with the outlet facing down, put the push handle of the glass syringe into the glass syringe, turn the syringe upside down, make the outlet upward, and then push the handle up into the syringe to a certain depth.

[0028] (3) Inhale 15ml of water from the outlet of the syringe, or use another 5ml syringe to inject 15ml of water into the test syringe in 3 times, block the outlet of the glass syringe and shake the glass syringe to fully mix the cement and water.

[00...

Embodiment 2

[0032] Embodiment 2, the steps are as follows:

[0033] Test the chemical shrinkage value of 50g of cement under the condition of 0.3 water-cement ratio according to the operation of Example 1. The first reading time is the time when the syringe is finally fixed, which is about 1 minute after adding water to the cement. According to the change of the liquid level in the glass scale tube, read the volume shrinkage of different ages and convert it into chemical shrinkage. Taking time as the abscissa and the chemical shrinkage as the ordinate, draw the curve of the volumetric chemical shrinkage per unit weight of cement over time, which is denoted as curve A.

[0034] The chemical shrinkage of cement with the same mass and water-cement ratio is tested by traditional methods. Put 50g of cement into a glass bottle, add 15g of water and stir evenly, insert a rubber stopper with a glass measuring tube into the bottle mouth, and seal it with vaseline and paraffin. Use a dropper to a...

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Abstract

The invention provides a cement chemical shrinkage test device and method. The cement chemical shrinkage test device consists of a glass graded tube, a syringe needle, a glass syringe and a support. By use of favorable leak tightness and disassembly and assembly convenience of the syringe and the needle, the quick test operation can be realized, and chemical shrinkage information of the relatively early cement hydration age can be obtained; meanwhile, the needle is utilizes for controlling the water amount so as to perform the chemical shrinkage test on cement pastes with different water-cement ratios; and the test device is easy to prepare, convenient to operate and reliable in test results.

Description

technical field [0001] The invention relates to a cement chemical shrinkage test device and a test method. Background technique [0002] After water is added to cement, the volume shrinkage due to the hydration reaction is called the chemical shrinkage of cement. Studies have shown that the chemical shrinkage value produced during the hydration process of cement paste is about 7% to 9%. The shrinkage during the cement hydration process will lead to cracking of cement and concrete, affect the performance of concrete, and even cause engineering accidents, so its accurate measurement is very important. The chemical shrinkage of cement paste begins to occur after adding water to the cement, and is accompanied by the hydration reaction of the cement until the end of the reaction. In the early stage after adding water to the cement, the chemical shrinkage value is also larger due to the faster hydration reaction rate. Therefore, to determine the chemical shrinkage value of cemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38
Inventor 朱洪波李晨闫美珠成轶杰
Owner TONGJI UNIV
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