Need in-degree device and use in asphalt need in-degree determination

A technology for penetration and bitumen, applied in measurement devices, flow characteristics, instruments, etc., can solve the problems of large deviation of measurement results, insufficient and incomplete temperature conditioning effect, etc.

Active Publication Date: 2007-11-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fundamental defect of this method is that it does not fundamentally solve the problem that the temperature conditioning effect of the sample caused by the shortened time is not in place and incomplete, resulting in large deviations in the measurement results.
Therefore, it can only be used as a reference in emergency situations

Method used

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  • Need in-degree device and use in asphalt need in-degree determination
  • Need in-degree device and use in asphalt need in-degree determination
  • Need in-degree device and use in asphalt need in-degree determination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Penetration at 25°C is used as the grading index for most asphalt products, and it is a must for almost every asphalt sample. The main dimensions of the improved penetration dish used in this embodiment are: cylinder outer diameter D 55mm, cylinder height 35mm, bow height h: diameter D=0.18.

[0029]In this example, straight-run asphalt, SBS modified asphalt and modified asphalt samples made by adding various chemical modifiers were selected, which were prepared by different processes, and the standard dish and the improved dish were used as experimental molds respectively. Their 25°C needle penetrations were measured. Wherein, the measurement process of the standard dish is carried out according to the standard method GB / T4509-1998, wherein the cooling time of cooling is 1 hour, and the constant temperature time is 1 hour; adopting the improved dish of the present invention, except that the cooling time of cooling and the constant temperature time are respectively high...

Embodiment 2

[0033] Measure the penetration value of the same sample at multiple different temperatures, and calculate the correlation coefficient R of the penetration result through linear regression, and measure the accuracy of the penetration measurement result by the degree to which R meets the corresponding specified value. In recent years, mathematical statistics methods have been introduced to verify the accuracy of needle penetration test results. In this example, when a standard dish is used, the measurement process is carried out according to the standard method GB / T 4509-1998, wherein the cooling time is 1 hour, and the constant temperature time is 1 hour; the improved needle penetration dish used in this example The main dimensions are: cylinder outer diameter 55mm, cylinder height 35mm, bow height h: diameter D=0.28, except that the cooling time and constant temperature time are shortened by 0.5 hours compared with the standard dish, the rest of the process is also in accordanc...

Embodiment 3

[0036] The main dimensions of the improved penetration dish used in this embodiment are: outer diameter of cylinder D 55mm, cylinder height 35mm, bow height h:diameter D=0.05. The standard dish and the improved dish are used to measure the penetration of asphalt samples, except for the following conditions, other operating conditions and steps are the same as the standard method. Wherein when using the standard dish, the cooling time at room temperature and the constant temperature time in the constant temperature water bath are 1.0 hours; when using the improved dish, the cooling time at room temperature and the constant temperature time in the constant temperature water bath are 0.75 hours , and the measurement results are shown in Table 3.

[0037] sample number

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Abstract

A penetrator is prepared as forming outline of penetrator by symmetrically cutting off two parts of cylindrical column, setting cut surface to be vertical to top and bottom surfaces of original cylindrical column, setting top and bottom surfaces of cut-off part to be bow form, setting arch height of said bow form to be H and external diameter of cylindrical barrel to be D to make ratio of H to D be 0.05-0.30.

Description

technical field [0001] The invention relates to a penetration dish and its application in the determination of asphalt penetration, which is an improvement to the conventional penetration dish, and can quickly measure the penetration of asphalt when it is used to measure the penetration of asphalt the goal of. Background technique [0002] Petroleum asphalt is a thermoplastic viscoelastic material, and its rheological properties are closely related to temperature. It changes state when it is stressed or changed by temperature. From a macro point of view, at low temperature, asphalt is hard and brittle, and its properties are similar to glass; when the temperature is close to the softening point, asphalt begins to undergo viscoelastic deformation, and at this time the asphalt is relatively soft, both elastic and viscous; the temperature continues As the temperature rises, further deformation occurs due to the trend toward flow; when flow deformation prevails, the asphalt be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/12G01N33/42
Inventor 吴佩尊宁爱民朱玲赵丽马丹杨梅景东宇
Owner CHINA PETROLEUM & CHEM CORP
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