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Method for determining bulk density of field core sample from asphalt pavement

A technology of bulk density and determination method, which is applied in the field of determination of bulk density, can solve the problems of inaccurate density measurement, many open pores on the side wall of the core sample, and difficult to clean, so as to achieve accurate bulk density and eliminate open pores the effect of the influence

Inactive Publication Date: 2013-08-14
RES INST OF HIGHWAY MINIST OF TRANSPORT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three outstanding problems. First, sticky oil, penetrating oil and loose particles are often attached to both ends of the core samples on site, which are difficult to clean and seriously affect the accuracy of the test. Second, the core samples on site are all obtained by core drilling machines. , the side wall of the core sample often has more open pores; third, due to the difference between the on-site forming state and the indoor forming state, the depth of the structure at both ends of the on-site core sample is often larger, similar to the open pores, which may easily lead to inaccurate density measurement

Method used

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  • Method for determining bulk density of field core sample from asphalt pavement
  • Method for determining bulk density of field core sample from asphalt pavement
  • Method for determining bulk density of field core sample from asphalt pavement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Measuring the bulk density of the core sample of asphalt concrete

[0023] 1.1 Use a drill with an inner diameter of about 80-83mm to take out a core sample from the road;

[0024] 1.2 After cutting both ends of the core sample by 2mm with a cutting machine, wrap the core with absorbent paper, and then place it in a vacuum container for continuous suction for 15 minutes to absorb the water in the absorbent;

[0025] 1.3 Use an electronic balance with a measuring range of 4000g and a sensitivity of 0.01g to weigh the air weight of the dry test piece m1=2522.6g;

[0026] 1.4 Melt the paraffin to 110~115℃, use a dropper to drop the wax into the visible holes on the surface of the core;

[0027] 1.5 After the wax is cooled, use a scraper to scrape the wax exposed on the surface of the core piece from the wax filling point, and scrape it flat along the surface, and weigh the total weight of the core piece and the wax filling m2=2531.9g;

[0028] 1.6 Reheat the paraffin to 60...

Embodiment 2

[0036] Example 2: Comparison of the wax dropping method of the present invention and the original wax sealing method

[0037] After the completion of the construction, a total of 34 core samples were drilled on site, 19 of which were measured using the method of the present invention, and the remaining 15 were measured using the original test method. The test results are shown in Table 1 and Table 2 respectively. Shown.

[0038] Table 1 Measurement results of the method of the present invention

[0039]

[0040]

[0041] Table 2 Measurement results of the original wax sealing method

[0042]

[0043] The maximum theoretical relative density in Table 1 and Table 2 are all on the day of paving the surface layer, taken at the construction site, and measured using the vacuum method in the "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTG E20—2011) (On-site void ratio=1-bulk volume relative density / maximum theoretical relative density). Through the comparison of the...

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Abstract

The invention relates to a method for determining the bulk density of a field core sample from an asphalt pavement. The method comprises the following steps of: sampling the core sample from the pavement with a drill bit, weighing a dried core part to obtain weight m1, dropping paraffin into a visible small hole in the surface of the core part by a dropper, leveling the surface of the core part with a scraper, and then weighing the core part and the filled paraffin to obtain total weight m2; sealing the weighed core part with wax, weighing the wax-sealed core part to obtain weight m3, and finally, weighing the wax-sealed core part in water to obtain weight m4; and calculating the density Gb of the filed core part, wherein s=m1 / V=m1 / (m3-m4-(m3-m2) / Gp). By adopting the method, the problems in traditional testing methods can be effectively solved, and the bulk density of the field core sample is accurately determined.

Description

Technical field [0001] The invention relates to the technical field of road engineering, in particular to a method for measuring the gross volume density of on-site core samples of asphalt pavement. Background technique [0002] Different from asphalt, which is a homogeneous material without pores inside, asphalt mixture is a porous and non-homogeneous composite material. Due to different material conditions and measurement conditions, the pores, aggregates and aggregates inside the aggregate considered The calculated density will be different depending on the gaps, closed pores, open pores, and structural depth. [0003] There are many density test methods for indoor compacted asphalt mixtures, such as surface dry method, water gravity method, wax seal method, volume method, etc. The most essential difference between these methods is that the void composition of the asphalt mixture they contain is different. The surface drying method measures the entire volume covered by t...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N9/08
Inventor 王旭东曾峰周兴业张蕾肖倩张晨晨张宇单伶燕
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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