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Journal ArticleDOI

Assessment of Intelligent Compaction Quality Evaluation Index and Uniformity

01 Jun 2022-Journal of transportation engineering-Vol. 148, Iss: 2
TL;DR: In this article , a more accurate intelligent compaction quality evaluation index is proposed, Acceleration Intelligent Compaction Value (AICV), based on field measurement data analysis, AICV turned out to be effective to elevate quality evaluation accuracy.
Abstract: Compaction Measurement Value (CMV) is the most widely used quality evaluation index for intelligent compaction. However, with the growth of compaction degree, CMV becomes less accurate due to increased reaction force from densified geomaterials. To solve this problem, this paper proposes a more accurate intelligent compaction quality evaluation index, acceleration intelligent compaction value (AICV). Based on field measurement data analysis, AICV turned out to be effective to elevate quality evaluation accuracy. Additionally, the singularities were detected by 3σ normal distribution in order to assess the uniformity of subgrade compaction quality. Based on the semivariogram analysis method of spatial statistics, CMV and AICV were analyzed for spatial correlation, and the influence range of intelligent compaction technology employed for subgrade was evaluated. The results from this study provide a basis for further research on precision control and uniformity analysis of intelligent compaction technology.
Citations
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Journal ArticleDOI
TL;DR: In this paper , an integral system to study and simulate the paving compaction of asphalt motorways in Discrete Element Model two-dimensional (DEM2D) is introduced, which includes the whole procedure from aggregate image acquisition database establishment to the DEM2D simulation of paving Compaction.

2 citations

Journal ArticleDOI
TL;DR: In this article , the relationship between long-term texture features and engineering parameters using artificial neural network, and to determine the influence degree of each parameter was investigated. And the results showed that gradation and angularity are the most influential inputs for macro and micro-texture, respectively.

1 citations

Journal ArticleDOI
TL;DR: In this paper , a real-time calculation formulation for dry density in terms of peak acceleration was obtained by coupling the above two equations based on the corresponding relationship between void ratio and dry density.
Abstract: How to evaluate the compaction quality in real-time, i.e. how to establish the relationship between acceleration and dry density, is the key issue in the field of intelligent compaction. The response of acceleration to dry density involves two different physical mechanisms, where the relationship between force and acceleration follows the laws of kinematics and the relationship between force and void ratio (i.e. dry density) follows the constitutive law of soil. The current approach is to directly correlate dry density with acceleration, by which it is difficult to distinguish the role played by these two mechanisms. Moreover, the empirical formula established based on limited field data may not be in the correct mathematical form and may lead to invalid prediction in some cases. Firstly, the formula for peak acceleration and peak impact was obtained based on the kinematic equation, and the relationship between the acceleration and peak impact stress is further acquired. Additionally, the compaction envelope equation was established by the theoretical analysis of the compaction process under lateral restriction conditions, which describes the relationship between the peak impact stress and void ratio. The real-time calculation formulation for dry density in terms of peak acceleration was gained by coupling the above two equations based on the corresponding relationship between void ratio and dry density. Considering that there is lateral deformation during the actual compaction process, the proposed dry density formulation is approximated, and the calculation deviation caused by the difference between the actual constraint conditions and the ideal conditions can be reflected by adjusting parameters. Subsequently, the proposed compaction envelope equation was verified by the agreement between the existing laboratory experimental results and the prediction results. Finally, the real-time formulation for dry density was applied to the prediction of two sets of field tests, demonstrating that the formulation proposed in this paper is capable of predicting reasonably the compaction quality of soil.

1 citations

Journal ArticleDOI
TL;DR: In this paper , the performance of different intelligent compaction measurement values (ICMVs) and compare them with spot test measurements for asphalt pavement was analyzed using accelerometer data collected during the construction of the asphalt testbed.
Abstract: The main aim of this paper is to analyse the performance of different intelligent compaction measurement values (ICMVs) and compare them with spot test measurements for asphalt pavement. To accomplish this, a two-layer asphalt testbed was constructed using an instrumented double-drum roller. All ICMVs [compaction meter value (CMV), compaction control value (CCV), roller-integrated stiffness (kb), and vibratory modulus (EVIB)] were calculated using the same accelerometer data collected during the construction of the asphalt testbed. The analysis of ICMV data showed a strong correlation between kb and EVIB, while CMV and CCV demonstrated a strong correlation only when double jump of the roller drum did not occur. Further, none of the ICMVs recorded during the last roller pass of asphalt compaction showed an acceptable correlation with asphalt densities [measured using a non-nuclear density gauge (NNDG)], mainly due to the influences of the underlying support and asphalt temperature on ICMVs. A correction method to decouple the influence of underlying support on EVIB was developed and validated using existing data from the literature. The applicability of this method for different field scenarios was demonstrated using numerical modelling.

1 citations

Journal ArticleDOI
01 Feb 2023-Sensors
TL;DR: In this paper , the authors investigated the propagation characteristics of the vertical vibration wave in the soil field along the traveling direction of the vibratory roller, and found an exponential relationship between the wave amplitudes of the fundamental mode and higher-order modes.
Abstract: Vibratory compaction status has a significant influence on the construction quality of subgrade engineering. This study carried out field experiments to study the propagation characteristics of the vertical vibration wave in the soil field along the traveling direction of the vibratory roller. The propagation coefficients of the peak acceleration at different positions and compacting rounds are compared in both the time and frequency domains. The compaction status is estimated in the form of dynamic modulus of deformation (Evd) obtained by plate load tests. The experiment results show that the propagation coefficient of peak acceleration is affected by the traveling speed, excitation amplitude, and frequency of the vibratory roller, as well as the compacting rounds. An exponential relationship between the wave amplitudes of the fundamental mode and higher-order modes is revealed. The amplitude of the fundamental wave is maximum at the speed of 3 km/h, whereas the amplitudes of higher-order waves have a maximum of 1.5 km/h. The influences of compaction rounds on the average value of Evd are also investigated to provide a practical reference for engineering construction.

1 citations

References
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Journal ArticleDOI
TL;DR: In this article, a geophysical survey from Elk County, Kansas, USA is used to demonstrate the applicability of the approach to geostatistical prediction and simulation of attributes that fluctuate over large areas or volumes.
Abstract: Geostatistical prediction and simulation are being increasingly used in the earth sciences and engineering to address the imperfect knowledge of attributes that fluctuate over large areas or volumes—pollutant concentration, electromagnetic fields, porosity, thickness of a geological formation. Central to the application of such techniques is the need to know the spatial continuity, knowledge that is commonly condensed in the form of covariance or semivariogram models. Their preparation is subdivided here into the following steps: (1) Data editing, (2) Exploratory data analysis, (3) Semivariogram estimation, (4) Directional investigation, (5) Simple modeling, (6) Nested modeling. I illustrate these stages practically with a real data set from a geophysical survey from Elk County, Kansas, USA. The applicability of the approach is not limited by the physical nature of the attribute of interest.

172 citations

Journal ArticleDOI
Xunhao Ding1, Luchuan Chen, Tao Ma1, Haixia Ma, Gu Linhao1, Tian Chen1, Ma Yuan1 
TL;DR: In this article, the performance of the recycled asphalt concrete with stable crumb rubber asphalt (SCRA) binder was investigated and the results indicated that the rejuvenator has a positive effect on the low-temperature performance, moisture stability and fatigue resistance.

167 citations

Journal ArticleDOI
TL;DR: In this article, a field study was conducted with 30-m test strips using five granular materials and the test strips were compacted using a prototype CS-533E vibratory smooth drum roller and tested for various compaction parameters.
Abstract: To evaluate compaction meter value and machine drive power roller-integrated compaction technologies, a field study was conducted with 30-m test strips using five granular materials. The test strips were compacted using a prototype CS-533E vibratory smooth drum roller and tested for various compaction parameters using in situ test methods (e.g., nuclear moisture density, dynamic cone penetrometer, plate load tests, etc.). To characterize the roller machine-ground interaction, soil testing focused on measuring soil compaction parameters of the compaction layer, to a depth not exceeding 300 mm . The experimental testing of five test strips provided roller data and in situ measurements for several stages of compaction that were used in performing statistical regression analyses. The relationships between data from the roller-integrated compaction technologies were investigated with special consideration for the relative variation that was observed for each measurement system. Statistical averaging mitigated ...

105 citations

Journal ArticleDOI
TL;DR: The aim of this research is to develop a framework for the integration of BIM and structure verification to improve the application of B IM in road engineering and thus reduce the mistake and repetition in pavement design.

96 citations

Journal ArticleDOI
Junqing Zhu1, Tao Ma1, Fan Jianwei1, Zhanyong Fang1, Tian Chen1, Yang Zhou1 
TL;DR: In this paper, a modified regeneration method was proposed to address the variance of RAP gradation and poor bonding between stiff virgin binder and aged binder, and was compared with traditional method.

96 citations