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Aggregate Image Measurement System (AIMS) is listed on SCI Journal
Release time: 2018-08-29

Recently, Cui Peide and Xiao Yue, heads of the Aggregate Image Measurement System (AIMS) of the State Key Laboratory of Silicate, Wuhan University of Technology, as the first authors, published SCI papers in the journals "Construction and Building Materials" and "Materials" Included.

Construction and Building Materials

Chinese Academy of Sciences Area 2, Impact Factor 3.48

Summary: The aggregate image measurement system (AIMS) was used to evaluate the morphological characteristics of the aggregates. It was found through research that the morphological characteristics of the aggregates would seriously affect the performance of the asphalt mixture.

Paper address:

http://www.sciencedirect.com/science/article/pii/S0950061818317926

"Materials" SCI

Chinese Academy of Sciences Area 2, Impact Factor 2.46

Overview: The aggregate image measurement system (AIMS) was used to evaluate the fine aggregate morphology and surface texture at the micro-surface, and the effect of aggregate morphology on the sliding resistance at the single-stage micro-surface was discussed.

Paper address:

http://www.mdpi.com/1996-1944/11/6/920


The above two papers both use the Aggregate Image Measurement System (AIMS) of the American PINE Company. Why did both Cui Peide and Xiao Yue choose AIMS?

What is the Aggregate Image Measurement System (AIMS)?

,以经济的时间,达到对集料的有价值的深入了解。 The PINE's Aggregate Image Measurement System (AIMS) is used to quickly obtain the shape characteristics of aggregates, provide objective characteristics of grain edges, corners, textures and surface textures , and achieve valuable insights into aggregates in an economical time. Simply place the tray containing the aggregate samples into the aggregate image measurement system, and the system will automatically obtain an image of each particle and analyze its shape characteristics. This method can avoid the disadvantages of strong subjectivity and inaccuracy of traditional analysis methods, such as needle-like macroscopic observation and rupture surface counting, and has the characteristics of high efficiency and high accuracy .

Comparison of research methods on aggregate morphological characteristics

Let's first look at other methods besides AIMS to obtain the shape characteristics of aggregates. According to our summary of the research methods of various aggregate morphological characteristics at home and abroad, the following are summarized according to the indirect method, direct method and chronological order:

Summary Table of Research Methods for Global Aggregate Morphological Characteristics

experiment method

Issuer / Researcher

Chinese norms

Method type

On-site / indoor

Aggregate size

Uncompacted void fraction (fine aggregate)

AASHTO T304

Indirect method

On-site / indoor

Fine aggregate

Uncompacted void fraction (coarse aggregate)

AASHTO TP56

Indirect method

On-site / indoor

Coarse aggregate

Aggregate particle shape texture index

ASTM D3398

Indirect method

On-site / indoor

Coarse aggregate

Compacted aggregate resistance

FHWA-Report

Indirect method

On-site / indoor

Fine aggregate

Florida

Bearing ratio

FHWA-Report

Indirect method

On-site / indoor

Fine aggregate

Flow time method

Quebec Transportation Agency

Indirect method

On-site / indoor

Fine aggregate

Internal friction angle

(Direct Shear Test)

Chowhury (2001)

Indirect method

indoor

Coarse (fine) aggregate

Coarse aggregate crushed surface

ASTM D5821

Direct method

On-site / indoor

Coarse aggregate

Coarse aggregate needle-like content

ASTM D4791

Direct method

On-site / indoor

Coarse aggregate

VDG-40 video machine

LCPC

Direct method

indoor

Coarse aggregate

Aggregate Analysis Laser System (LASS)

Kim (2001)

Direct method

indoor

Coarse aggregate

Aggregate Particle Electronic Analysis System (CPA)

Tyler (2001)

Direct method

indoor

Coarse (fine) aggregate

Aggregate Image Analyzer (UIAIA)

Rao (2001)

Direct method

indoor

Coarse aggregate

Aggregate Image Analysis System (AIMS)

Masad (2003)

FHWA-Report

NCHRP 555

Direct method

indoor

Coarse (fine) aggregate

,美国联邦公路局FHWA的NCHRP 555研究项目《Test Methods for Characterizing Aggregate Shape, Texture, and Angularity》推荐的试验方法,试验的原理、效果、适用性和推广前景都得到了官方承认, 是目前行业内最理想的试验选择 。 From the development of test methods, Pine's AIMS aggregate image analysis system research method is officially recognized. The test method recommended by the US Federal Highway Administration FHWA's NCHRP 555 test method "Test Methods for Characterizing Aggregate Shape, Texture, and Angularity" Method, the principle, effect, applicability and promotion prospect of the test have been officially recognized, and it is the most ideal test choice in the industry at present .

What can you get from AIMS?

1

Particle shape and aggregate size

The AIMS system can use a high-definition video camera to capture images of different cross-sections of the aggregate and use software to perform three-dimensional modeling to obtain the three-dimensional shape of the aggregate. At the same time, because the camera position is calibrated, the information in the image You can add size information, and through computer graphics processing software, you can calculate the angularity and micro-texture of the aggregate.

AIMS internal working diagram

2

edges and corners

AIMS uses a unique evaluation system from 0 to 10,000 to define the angular characteristics of aggregates. As shown in the figure below, there are four kinds of angular images (small, medium, large, and large). It can be seen from the figure that the smaller the angularity index, the smoother the aggregate, similar to pebble. Such materials have poor adhesion with asphalt, low internal friction resistance, and poor resistance to permanent deformation (rutting). Try to avoid using such materials when selecting materials.

Aggregate measurement chart with different angularity

3

Microtexture

Because AIMS uses a high-definition camera to photograph the surface of the aggregate, it can evaluate the texture characteristics of its surface, as shown in the following figure: from 0 (smooth) to 1000 (rough), and different microscopic can be distinguished by quantitative description. Textured material surface.

Aggregate surface with different textures

Screenshot of the texture acquisition interface, and you can also see the aggregate measurement range

4

Aggregate wear

The industry-recognized method to evaluate the better abrasion resistance of aggregates is the French Micro-Deval micro-Dival abrasion test. The AIMS system is also used for aggregate wear tests, such as determining aggregate performance in Micro-Deval tests. The change in aggregate performance before and after the abrasion test reveals the ability of the aggregate to maintain anti-slip performance in field use. The following figure is the sample image and curve before and after the micro-Divar test.

Aggregate surface before and after abrasion, and test curves before and after the micro-Divar test

Aggregate size

。 AIMS can handle aggregate sizes ranging from 0.075 mm (# 200) to 25.0 mm (1 inch) .

The AIMS system provides trays of different sizes for testing aggregates with different maximum nominal particle sizes. The sizes of the trays include:

Fine aggregate: 0.075mm, 0.15mm, 0.30mm, 0.60mm, 1.18mm, 2.36mm

Coarse aggregate: 4.75mm, 6.35mm, 9.5mm, 12.5mm, 19.0mm, 25.0mm

Fully suitable for testing of coarse and fine aggregates.

Coarse and fine aggregate testing

For more information about the product, please feel free to contact us.

Hotline: 400-700-9998

Email: marketing@epc.com.hk

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