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Testing method for hole filling capability of cementing material in hydration process

A technology of gelling materials and testing methods, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve problems such as many influencing factors, complex characterization methods, and errors

Inactive Publication Date: 2015-11-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Because it is extremely difficult to measure the density of hydration products, the degree of hydration is usually used to indirectly reflect the ability of the cementitious material to fill the pores in the slurry, and it is not yet possible to directly and quantitatively characterize the ability of the cementitious material to fill the pores
Since cement hydration mainly produces external hydration products in the early stage of cement hydration, which have a strong ability to fill pores, but in the later stage, the proportion of internal hydration products is relatively high, and the ability to fill pores is weak. big error
In particular, there is no effective characterization method report on the filling capacity of auxiliary cementitious materials such as slag and fly ash, which hinders the efficient utilization of cementitious materials and the accurate prediction of slurry composition, structure and performance
[0004] The pore filling ability of cementitious materials is tested by indirect methods such as measuring the density of hydration products and measuring porosity. There are many influencing factors and complex characterization methods, and it cannot fully reveal the changes of cementitious materials in the hydration process in the slurry; therefore , there is an urgent need to find a simple and direct method for measuring the volume change of gelling materials during hydration

Method used

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  • Testing method for hole filling capability of cementing material in hydration process
  • Testing method for hole filling capability of cementing material in hydration process
  • Testing method for hole filling capability of cementing material in hydration process

Examples

Experimental program
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Effect test

Embodiment 1

[0043] In this embodiment, Portland cement with different particle size intervals is taken as an example to test the ability to fill pores, including the following steps:

[0044] (1) Test the density ρ of the gelled material c ,Specifically:

[0045] After injecting anhydrous kerosene into the Lishi bottle to the 0-1mL scale line (based on the lower part of the meniscus), cover the bottle stopper and put it in a constant temperature water tank, so that the scale part is immersed in water (the water temperature should be controlled at the scale of the Li's bottle. temperature), keep the temperature for 30 minutes, and record the initial (first) reading. Take out the Lee's bottle from the constant temperature water tank, and carefully wipe off the kerosene-free part of the Lee's bottle's slender neck with filter paper. The cement sample should be passed through a 0.90mm square hole sieve in advance, dried at 110±5°C for 1 hour, and cooled to room temperature in a desiccator. ...

Embodiment 2

[0056] In this embodiment, the slag in different particle size ranges is taken as an example to test the ability to fill pores, including the following steps:

[0057] (1) Test the density ρ of the gelled material c , which is exactly the same as the above method for testing cement density

[0058] (2) According to the method of ASTMC1608, test the chemical shrinkage V during the hydration process of unit volume cementitious material c . The specific test process is exactly the same as that of cement, but in order to promote the hydration of slag, 10% Ca(OH) by mass is added to the powder. 2 Finally, the liquid phase environment uses 0.2mol / L NaOH solution instead of water.

[0059] (3) Test the mass m of the hydrated sample of the gelled material after vacuum drying at 60°C 60 , the mass of the hydrated sample after vacuum drying at 1050°C m 1050 ;

[0060] (4) Calculate the pore filling capacity V of the cementitious material during the hydration process F :

[0061]...

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Abstract

The invention discloses a testing method for the hole filling capability of a cementing material in the hydration process. The testing method includes the following steps that firstly, the density Rho c of the cementing material is tested; secondly, chemical shrinkage Vc of the cementing material of unit size in the hydration process is tested; thirdly, the mass m60 of the cementing material in a hydrated sample after vacuum drying at the temperature of 60 DEG C and the mass m1050 of the cementing material in a hydrated sample after vacuum drying at the temperature of 1050 DEG C are tested respectively; fourthly, the hole filling capability VF of the cementing material in the hydration process is calculated. Operation is simple, and the hole filling capability of the cementing material in the hydration process can be directly measured.

Description

technical field [0001] The invention relates to a test method for building materials, in particular to a test method for the ability of gelling materials to fill pores in the hydration process. Background technique [0002] The macroscopic properties of cement-based materials mainly depend on their porosity. During the hydration process of the cementitious material, the hydration products gradually fill the pores in the slurry, making the slurry gradually harden and develop strength. Therefore, to accurately predict the macroscopic properties of cement paste, it is necessary to quantitatively characterize the ability of cementitious materials to fill pores during hydration. [0003] Because it is extremely difficult to measure the density of hydration products, the degree of hydration is usually used to indirectly reflect the ability of cementitious materials to fill the pores in the slurry, and it is not yet possible to directly and quantitatively characterize the ability ...

Claims

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Application Information

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IPC IPC(8): G01N33/00
Inventor 余其俊张同生韦江雄刘向阳
Owner SOUTH CHINA UNIV OF TECH
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