Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (6): 1799-1808.doi: 10.13229/j.cnki.jdxbgxb.20221208

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Key factors affecting smart aggregate perception and data analysis methods

Ning WANG1(),Tao MA1,Feng CHEN1(),Yong-qiang FU2   

  1. 1.School of Transportation，Southeast University，Nanjing 211189，China
    2.Lihu Street Office，Binhu District，Wuxi 214000，China
  • Received:2022-09-18 Online:2023-06-01 Published:2023-07-23
  • Contact: Feng CHEN E-mail:wangning11@seu.edu.cn;fengc@seu.edu.cn

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Abstract:

In order to investigate the influences of factors such as load form， packaging material and shape characteristics on the monitoring results of the SmartRock sensor， so as to provide an effective way for evaluation of the physical and mechanical properties of the mixture media based on sensor parameters. Firstly， the indoor secondary calibration tests of the SmartRock sensor were carried out； secondly， 3D finite element numerical modelling of the embedded sensor-mixture medium coupling were used to study the matching error. In addition， the gyratory compaction and unconfined compressive strength tests of cement stabilized macadams with the SmartRock sensor were performed， and the sensor responses were analyzed. The results show that the stress response of SmartRock under concentrated load is much greater than that of a uniform load； provided the ratio of sensor height to bottom side length H/D is less than 0.3 and the ratio of the sensor package material to the modulus of the surrounding medium Ep/Em is greater than 5， a low and stable matching error can be achieved； in addition， the evolution of the compaction degree and strength of the mixture can be characterized by the dispersion coefficient Sv of the stress response of SmartRock.

Key words: road engineering, cement stabilized aggregates, intelligent sensing, matching errors, embedded sensor

CLC Number: 

  • U416.2

Fig.1

SmartRock sensor and wireless antenna"

Fig.2

Schematic diagram of piezoresistive pressure sensor"

Fig.3

SmartRock sensor calibration test"

Fig.4

SmartRock sensor calibration device"

Fig.5

External load curve and voltage curve at SmartRock output for different contact areas"

Fig.6

Schematic diagram of different load forms acting on sensor surface"

Fig.7

3D finite element model and meshing of mixed media-embedded sensor coupling"

Fig.8

Matching error curves for different modulus ratios between sensor and mixture media"

Fig.9

Non-uniform stress distribution on the surface of embedded sensor"

Fig.10

Matching error curves for different ratios of sensor height to bottom side length"

Fig.11

Cement stabilized aggregates grading curve"

Fig.12

Gyratory compaction and unconfined compressive strength test based on smartRock sensor"

Fig.13

Relative compactness of the mixture and Smartrock stress response curves during gyratory compaction"

Fig.14

Fluctuation analysis of SmartRock stress response during gyratory compaction"

Fig.15

Axial load and SmartRock stress response curves during the unconfined compressive strength test"

Fig.16

Fluctuation analysis of SmartRock stress response during unconfined compressive strength test"

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