Laboratory evaluation of electromagnetic density gauges for hot-mix asphalt mixture density measurement

Leng, Zhen; Zhang, Zeyu; Zhang, Yuan; Wang, Yangyang; Yu, Huayang; Ling, Tianqing

doi:10.1016/j.conbuildmat.2017.09.186

Cited by 31 publications

(21 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Gradation segregation is one of the main factors affecting the durability of asphalt pavement, because both coarse and fine aggregate segregation may lead to pavement failures. These failures reduce the service performance and service life of asphalt pavement [2][3][4][5]. Therefore, efforts have been devoted by various researchers for gaining improved insight into the mechanism, affecting factors, measurement and evaluation methods of aggregate gradation segregation [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Gradation Segregation on Mechanical Properties of an Asphalt Mixture

Zhu

et al. 2019

Applied Sciences

Self Cite

View full text Add to dashboard Cite

Gradation segregation strongly affects the service performance of asphalt pavement. However, rare studies focus on the influences of segregation on asphalt mixture as it is difficult to simulate segregation in a laboratory. This paper presents a research aiming to evaluate the effects of gradation segregation using the two dimensional (2D) discrete element method (DEM). To achieve this objective, the gradation segregation levels are defined according to the differences between control and segregated gradations. Based on this, asphalt mixtures with three gradations at three segregation levels were selected. The corresponding 2D DEM models were then built using Particle Flow Code 2D (PFC 2D). The aggregate skeletons in the asphalt mixture were determined separately by means of the contact point and contact force. Based on this, the variations on the aggregate skeleton, aggregate distribution, and mechanical properties of the asphalt mixture under vertical load were studied at three different segregation levels. This study indicates that the aggregate skeleton in asphalt mixture can be affected by the gradation segregation. The correlation between gradation segregation and mechanical property is also determined in this study.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Gradation Segregation on Mechanical Properties of an Asphalt Mixture

Zhu

et al. 2019

Applied Sciences

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, they continue to present a logistical challenge. The radiation source requires careful handling, special vehicles are often required for transportation, tunnels and other areas with hazardous material restrictions must be avoided, nuclear material handling training is usually required for technicians and gauges are typically heavy and are not readily carried around construction sites [13]. Furthermore, many technicians report that the repeatability is inadequate, with multiple readings in the same location concerningly variable.…”

Section: Nuclear Density Gaugesmentioning

confidence: 99%

“…In contrast, there is no disagreement that mixture temperature and the presence of moisture on the surface significantly impact NNDG results. Furthermore, most researchers have reported some [13,16] aspects of the mixture composition, such as aggregate source, grading and maximum size, as important, with all researchers, and the manufacturer, recommending mixture-specific calibration. Consequently, NNDGs must be calibrated to the specific mixture being tested and it is best to test the surface at a temperature and moisture content that is consistent with the conditions during the calibration.…”

Section: Factors Affecting Nndg Reliabilitymentioning

confidence: 99%

Evaluation of a non-nuclear density gauge as an alternate to destructive coring for airport asphalt acceptance testing

White

2019

SN Appl. Sci.

View full text Add to dashboard Cite

A non-nuclear density gauge (NNDG) was evaluated as part of an asphalt runway resurfacing project. The repeatability of the NNDG was found to be high but asphalt temperature and surface moisture had a significant effect on the reliability of NNDG inferred asphalt density. It was also found that a single NNDG inferred density, located immediately over the core location, provided greater agreement with core density than an averaged NNDG density over and around the location of the core. It was concluded that when used 1 day behind the surface paving operation, when the temperature had stabilised and the surface was dry, the NNDG was a reliable replacement for destructive coring for density measurement. Consequently, the coring frequency was reduced by 75% following NNDG calibration. However, the influence of temperature and moisture rendered the NNDG less suited to quality control during the compaction rolling process. Finally, it is recommended that additional research be undertaken to extend these conclusions to other asphalt mixtures, allowing other airports to reduce the frequency of destructive coring for density testing during asphalt resurfacing, following mixture-specific calibration of the NNDG.

show abstract

“…Moreover, instrument reduced the number of cores drilled out as the compactness of the pavement was assessed to a good level of accuracy using step frequency radar [20]. Leng et al (2018) evaluate the non-nuclear density gauge under various laboratory-controlled conditions have concluded that the direction of placing the instrument has no effect on density readings. They also concluded that gauge efficiency is affected by different gradations, but it has no clear effect by the bitumen content [21].…”

Section: Introductionmentioning

confidence: 99%

“…Leng et al (2018) evaluate the non-nuclear density gauge under various laboratory-controlled conditions have concluded that the direction of placing the instrument has no effect on density readings. They also concluded that gauge efficiency is affected by different gradations, but it has no clear effect by the bitumen content [21]. Van den Bergh et al (2017) carried out to monitor the compaction process concludes that immediate evaluation using density gauge is important to get accurate results.…”

Section: Introductionmentioning

confidence: 99%

Field Assessment of Non-nuclear Methods Used for Hot Mix Asphalt Density Measurement

et al. 2019

View full text Add to dashboard Cite

Destructive nature along with the associated higher cost of the traditional core method used for hot mix asphalt density measurement has convinced researchers switching to some non-destructive technique for this purpose which is cost efficient as well. Earlier, nuclear density gauges were introduced for this purpose which was non-destructive as well. Since such devices were associated with the use of gamma rays, therefore, leading to safety and health issues. Last decade observed a revolution in asphalt density measurement technique with the evolution of non-nuclear density gauges. This research work is carried out with the objective to determine the efficiency and accuracy of a newly developed non-nuclear density gauge i.e. PQI-380 for field conditions as it needs its thorough evaluation prior to future uses in many of the developing countries including Pakistan. Density data obtained using standard core method and non-nuclear density gauge for 195 location confirms the satisfactory performance of the instrument. Results obtained show that the coefficient of correlation is near to 0.9. which refers to a strong correlation between the density data. Moreover, performance criteria e.g. root mean square error and mean absolute error between the density data set is also very low confirming the good measuring abilities of the device. Instrument performed well for repeatability analysis giving maximum coefficient of variance less than 5 percent.

show abstract

Laboratory evaluation of electromagnetic density gauges for hot-mix asphalt mixture density measurement

Cited by 31 publications

References 15 publications

Effect of Gradation Segregation on Mechanical Properties of an Asphalt Mixture

Effect of Gradation Segregation on Mechanical Properties of an Asphalt Mixture

Evaluation of a non-nuclear density gauge as an alternate to destructive coring for airport asphalt acceptance testing

Field Assessment of Non-nuclear Methods Used for Hot Mix Asphalt Density Measurement

Contact Info

Product

Resources

About