A thermal porosimetry method for determining the pore structure of cement-based materials
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A technology of cement-based material and pore structure, which is applied in the direction of material thermal development, suspension and porous material analysis, measurement device, etc.
Active Publication Date: 2011-12-21
GUOQIANG CONSTR GRP
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Until recently, there has been no domestic report on measuring th
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Embodiment 1
[0067] In this embodiment, the cement stone with a water-cement ratio of 0.6 is an example:
[0068] (1) The sample is first made into a sheet, so that it can be put into the DSC aluminum crucible of the differential scanning calorimeter;
[0069] (2) Put it in a drying oven at 60°C and dry it to constant weight, and weigh it in m d =8.71mg; Determination of the total volume V of the cement-based material sample 样 =18.47mm 3 ;
[0070] (3) Then put the sample into deionized water, and place it in a crucible after vacuum water saturation treatment to wait for DSC test. In order to make the experimental data more accurate, it is necessary to drop kerosene on the sample, and then seal the crucible;
[0071] (4) Set the experimental conditions for the DSC test, wherein the sample temperature T of the DSC test is controlled at -40°C to +5°C, and the temperature rise and fall rates are both 0.3°C / min. In this way, the data of the sample temperature T and the corresponding heat ...
Embodiment 2
[0093] In this embodiment, the cement stone with a water-cement ratio of 0.6 is an example:
[0094](1) The sample is first made into a sheet, so that it can be put into the DSC aluminum crucible of the differential scanning calorimeter;
[0095] (2) Put it in a drying oven at 60°C and dry it to constant weight, and weigh it in m d =8.80mg; Determination of the total volume V of the cement-based material sample 样 =18.48mm 3 ;
[0096] (3) Then put the sample into deionized water, and place it in a crucible after vacuum water saturation treatment to wait for DSC test. In order to make the experimental data more accurate, it is necessary to drop kerosene on the sample, and then seal the crucible;
[0097] (4) Set the experimental conditions for the DSC test, wherein the sample temperature T of the DSC test is controlled at -40°C to +0°C, and the temperature rise and fall rates are both 3°C / min. The data of the sample temperature T and the corresponding heat flow P are thus ...
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Abstract
The invention relates to a method for measuring a cement-based material pore structure, in particular to a thermodynamic pore counting method for measuring internal micropore total volume, micropore shape, porosity, pore radius distribution and the like of a cement-based material. The invention provides a new calculation model for representing the cement-based material pore structure to overcome the defects of the thermodynamic pore counting method in theory from the thermodynamic angle, and then establishes the thermodynamic pore counting method for measuring the cement-based material pore structure by taking the characteristics of the cement-based material into consideration. Compared with other methods, the measuring method has the advantage of avoiding microstructure change caused by vacuum, so that the pore total volume of the micropore, the micropore shape, the porosity and the pore radius distribution can be analyzed and the corresponding relationship between ice and temperature in the cement-based material can be simulated by the thermodynamic pore counting method, and the thermodynamic pore counting method can be applied to further explaining mechanical and thermodynamic performance change mechanisms of the cement-based material at low temperature.
Description
technical field [0001] The invention relates to a method for measuring the pore structure of cement-based materials, in particular to measuring the total internal micropore volume, micropore shape, porosity and pore radius distribution of the cement-based material by a thermal porometer method. Background technique [0002] Various deterioration processes of concrete structures, such as chemical and physical processes such as freeze-thaw, carbonization, infiltration, and steel corrosion, mainly involve two main influencing factors: water and its pores or cracks in concrete. The pores and other structural features are One of the main factors affecting the durability of concrete. [0003] At present, various feasible methods for determining the pore structure have been applied to cement-based materials. However, thermal porosimetry is an emerging pore analysis technique. Because the saturated sample avoids the microstructural changes caused by vacuum, and the freeze-thaw dam...
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