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Asphalt mixture workability index tester

A technology of asphalt mixture and tester, which is applied in the directions of instruments, flow characteristics, measuring devices, etc., can solve the problems of different workability and unreasonable asphalt mixture.

Inactive Publication Date: 2008-08-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the workability of asphalt mixture is the result of many factors such as asphalt type, aggregate type, gradation type and temperature, the viscosity value of asphalt is only one of the factors affecting the workability of asphalt mixture. Different types of asphalt mixtures with the same ratio have different workability in fact. Therefore, only by asphalt viscosity-temperature curve to determine the mixing temperature of asphalt mixture and use the void ratio to indirectly evaluate the workability of asphalt mixture irrational

Method used

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  • Asphalt mixture workability index tester
  • Asphalt mixture workability index tester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Workability index test of AC13 asphalt mixture under different speed and temperature conditions

[0030] The relationship between different temperatures and workability index of AC13 asphalt mixture is shown in Table 1(1) and Table 1(2) under the conditions of tester speed of 10 rpm and 15 rpm respectively.

[0031] Table 1(1)

[0032]

[0033] Table 1(2)

[0034]

[0035] The test results in Table 1(1) and Table 1(2) show that the workability index of the asphalt mixture increases with the increase of temperature under the two speeds of 10 rpm and 15 rpm of the agitator, and the asphalt mixture Enhanced workability. When the temperature exceeds 135°C, if the asphalt mixture temperature continues to increase, the workability index of the asphalt mixture will increase slightly and remain almost unchanged. Therefore, it can be determined that the optimum compaction temperature of the asphalt mixture is 135°C, and The workability index corresponding to 135°C is us...

Embodiment 2

[0037] Both AC13 and AC20 asphalt mixtures were mixed at a stirring speed of 15 rpm, and their workability indices at different temperatures were tested respectively.

[0038] The test results of AC13 asphalt mixture are shown in Table 2 (1), and the test results of AC20 asphalt mixture are shown in Table 2 (2).

[0039] Table 2(1)

[0040]

[0041]

[0042] The test results in Table 2(1) and Table 2(2) show that at the same temperature, the coarser the aggregate, the smaller the workability index of the mixture and the worse the compactability. For AC13 asphalt mixture, when the temperature is higher than 135℃, the workability index changes little, so 135℃ can be regarded as the optimal compaction temperature of AC13 asphalt mixture. For AC20 asphalt mixture, when the temperature is higher than 140℃, the workability index changes little, so 140℃ can be regarded as the optimum compaction temperature of AC20 asphalt mixture. Therefore, in the construction process, in or...

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Abstract

The invention relates to a tester for a workability index of asphalt mixture, comprising a machine frame, a change speed motor, a digital display screen, a torque sensor and a sample barrel, wherein the sample barrel is provided inside with a stirrer driven by the motor; the stirrer is provided with stirring blades; the change speed motor is connected with a main shaft of the stirrer by a reducer; the torque sensor is arranged on the main shaft of the stirrer or an output shaft of the reducer; the wall of the sample barrel is provided with a heating cavity and temperature sensors; stirring blades are provided with temperature sensors. The tester takes a reciprocal value of the torque generated when the asphalt mixture is stirred as the workability index of the asphalt mixture. The asphalt mixture is heated and stirred in the sample barrel, and the workability index and the temperature data are displayed on the display screen by a data acquisition display system, which facilitates the confirmation of the best stirring temperature and the compacting temperature of the asphalt mixture by the workability index which is of a quantized value.

Description

technical field [0001] The invention relates to a workability index tester for asphalt mixture used for road paving. Background technique [0002] At present, asphalt mixture is directly laid on the base layer in highway construction, and then compacted by special road rollers to form the road surface. [0003] Asphalt mixture is generally made of aggregates of different thicknesses, fillers and asphalt liquid in a certain proportion and heated to a certain temperature and stirred and mixed. The workability of asphalt mixture is the basic characteristic of its paving and rolling performance, which is directly related to important quality indicators such as the smoothness and compaction of asphalt pavement. The workability of asphalt mixture is related to its mixing and compaction temperature. Therefore, it is necessary to determine the mixing and compaction temperature through the workability test of asphalt mixture. So far, there is no quantitative index for the workabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42G01N11/14G01N25/00
Inventor 侯曙光
Owner NANJING UNIV OF TECH
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