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Method for detecting self-constriction of cement-based material

A technology of cement-based materials and detection methods, which is applied in the directions of material weighing, material analysis, and measuring devices, which can solve the problems of low precision of measuring devices and difficulties in implementing volumetric methods, so as to achieve accurate and reliable experimental data, reduce adverse effects, and improve The effect of precision

Inactive Publication Date: 2021-08-03
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volumetric method is difficult to implement, the accuracy of the measuring device is often low, and continuous automatic data collection has not yet been realized

Method used

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  • Method for detecting self-constriction of cement-based material
  • Method for detecting self-constriction of cement-based material
  • Method for detecting self-constriction of cement-based material

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Test raw materials and proportions: Ordinary Portland cement with a strength grade of 42.5 and a water-binder ratio of 0.30.

[0062] Density ρ of saturated calcium chloride solution 液 =1.40g·ml -1 , the mass M of the elastic thin rubber bag 1 =1.6856g,

[0063] The mass M of the elastic thin rubber bag 5 loaded into the slurry 2 =2238.0986g, after being sealed and suspended on the hydrostatic balance 1, the indication of the balance is cleared, so the indication of the balance at this time is m 0 =0.000g, the ambient temperature during the test was between (24.2-25.3)°C. The data acquisition interval is 120 seconds, and the data acquisition system 7 continues to record for 7 days and then closes and derives the data. The data processing software is used to uniformly convert the indications of the hydrostatic balance into self-shrinkage values ​​according to the formula (1), and the final result after conversion is as follows: figure 2 shown.

Embodiment 2

[0065] Test raw materials and ratio: the mass ratio of ordinary Portland cement with a strength grade of 42.5 to S95 grade slag powder is 7:3, and the water-cement ratio is 0.30.

[0066] Density ρ of saturated calcium chloride solution 液 =1.40g·ml -1 , the mass M of the elastic thin rubber bag 1 =1.7262g,

[0067] The mass M of the elastic thin rubber bag 5 loaded into the slurry 2 =2121.0891g, after being sealed and hung on the hydrostatic balance 1, the indication of the balance is cleared, so the indication of the balance at this time is m 0 =0.000g, the ambient temperature during the test was between (24.5-25.8)°C. The data acquisition interval is 120 seconds, and the data acquisition system 7 continues to record for 7 days and then closes and derives the data. The data processing software is used to uniformly convert the indications of the hydrostatic balance into self-shrinkage values ​​according to the formula (1), and the final result after conversion is as follow...

Embodiment 3

[0069] Test raw materials and proportioning: the mass ratio of ordinary Portland cement with a strength grade of 42.5 to S95 slag powder is 7:3, and then 0.2% (based on the mass of cement and slag powder) of concrete internal curing agent superabsorbent resin is added , The water-binder ratio is 0.33.

[0070] Density ρ of saturated calcium chloride solution 液 =1.40g·ml -1 , the mass M of the elastic thin rubber bag 1 =1.6961g,

[0071] The mass M of the elastic thin rubber bag 5 loaded into the slurry 2 =2189.9827g, after being sealed and hung on the hydrostatic balance 1, the indication of the balance is cleared, so the indication of the balance at this time is m 0 =0.000g, the ambient temperature during the test was between (24.2-25.1)°C. The data acquisition interval is 120 seconds, and the data acquisition system 7 continues to record for 7 days and then closes and derives the data. The data processing software is used to uniformly convert the indications of the hydr...

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Abstract

The invention relates to a method for detecting self-constriction of a cement-based material, which mainly comprises the following steps of measuring the change of buoyancy of cement-based material slurry in liquid along with time through a hydrostatic balance, continuously recording readings of the hydrostatic balance through a data acquisition system, and finally converting the data into a self-constriction value of the cement-based material through calculation. The saturated calcium chloride solution with the density higher than that of water is prepared as the carrier solution, so that the sensitivity of the hydrostatic balance to the volume change of the cement-based material is improved. By using the method, the self-constriction of the cement-based material can be continuously measured, the self-constriction condition of the cement-based material can be accurately reflected, and a convenient and accurate method for monitoring the self-constriction of the cement slurry is provided for actual production and scientific research.

Description

technical field [0001] The invention relates to the technical field of building material detection, in particular to a method for detecting self-shrinkage of cement-based materials. Background technique [0002] The autogenous shrinkage of cement-based materials is mainly due to the overall shrinkage caused by the loss of water in the internal capillary pores due to the consumption of internal water by the hydration of cement or other cementitious materials. The autogenous shrinkage of cement-based materials is one of the important indicators to evaluate its volume stability, and it is also the basis and premise for the calculation of early-age cracks. Although the autogenous shrinkage of cement-based materials has attracted great attention and attracted researchers to spend a lot of energy on scientific research However, a unified self-shrinkage test method standard has not yet been formed. According to the classification of existing test directions, the current main self-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
CPCG01N5/00
Inventor 孙振平杨敬斌赵一鹤穆帆远李祖悦
Owner TONGJI UNIV
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