Informal Discussion. The Revision of Road Note 29: A Guide to the Structural Design of Pavements for New Roads. 18 March, 1971.

Croney, D; GREGORY, JM

doi:10.1680/iicep.1971.6122

Cited by 3 publications

(4 citation statements)

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“…The bitumen was then heated to the mixing temperature of 160°C (Liu et al, 2010). Additionally, the loose mixture was being made around the optimum bitumen content to calculate the Theoretical Maximum Density (TMD) (Croney and Croney, 1998).The aggregates and bitumen were mixed totally till it is a well-covered to the temperature not further a 163°C (Asphalt Institute, 1988). • The hot mixtures were poured into a preheated steel mold.…”

Section: And Discussionmentioning

confidence: 99%

The Influence of Block Thickness on the Performance of Asphalt Paving Blocks

Abdelgalil¹,

Nor²

2014

RJASET

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Asphalt paving blocks have been known in some places around the world, but there have been very limited research being conducted to assess the influence of block thickness on the structural performance of asphalt paving blocks. This study describes the experimental study to evaluate the performance and properties of asphalt paving blocks placed with different block thicknesses i.e., 70, 80 and 90 mm, respectively. A number of 250 asphalt paving blocks was produced and examined in the laboratory to determine the density, air voids, the compressive load and the rut depth and displacement occurred in the surface of asphalt paving block. The results exhibited that the resistance of asphalt paving block to static loading increased as the block thickness increased. Moreover, the elastic deformation was affected significantly by increasing the block thickness. Meanwhile, the displacement of asphalt block from the pavement was slightly influenced by the block thickness.

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Section: And Discussionmentioning

confidence: 99%

The Influence of Block Thickness on the Performance of Asphalt Paving Blocks

Abdelgalil¹,

Nor²

2014

RJASET

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“…These elements must be able to fulfill the conditions that will ensure that the superstructure can serve safely in all climatic conditions throughout the project life and that a large number of vehicles can pass over it [3][4][5]. Road pavements are generally divided into two groups as flexible and rigid pavements [6,7]. Flexible pavements are those that are covered with bituminous or asphaltic materials, while rigid pavements consist of a surface layer of Portland cement concrete [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…In Turkey, single and double chip seals are mostly preferred types. Generally, chip seal is applied on roads that have a total traffic volume of 8.2 tons equivalent standard axle load of less than 2×10 6 in one way during the service period. It should be designed as a single chip if the traffic volume is less than 500000, and for the traffic volume over that value, it should be designed as a double chip.…”

Section: Introductionmentioning

confidence: 99%

The Effect of The Bearing Capacity of Sub-Grade Soil on The Thickness and Cost of The Superstructure of Chip Seals

TANYILDIZI

Çınar

2023

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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applied for preventative treatment of an existing road or to overlay low-trafficked roads. The thickness of the superstructure of a chip seal pavement is directly related to the bearing capacity of sub-grade soil. The bearing capacity of soil is represented by Resilient Modulus (MR) for the design of the thickness of layers. This study has focused on the effect of the bearing capacity of sub-grade soil on the thickness and cost of superstructures of chip seals. In addition, linear regression analysis was performed to investigate the relationship between the bearing capacity of the subgrade soil and the thickness of the superstructure. Two-dimensional numerical modeling was performed with the layer thicknesses found according to the resilient modulus. It was indicated that there was a strong correlation between the bearing capacity of sub-grade soil and the thickness of superstructures of chip seals with high R-square values. An increase in the bearing capacity of the subgrade resulted in a decrease in the thickness of the superstructures of the chip seal. So, it has importance in the aspect of economical to select the most proper soil that will be used in the superstructure of chip seals by taking care of the environment and conditions. In addition, Plaxis 2D modeling shows that a double-chip seal has less deformation and better bearing capacity than a single-chip seal.

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“…However, these assumptions are not realistic in field conditions ( 19 ). A more realistic assumption of interfacial bonding can infer a more accurate pavement performance prediction ( 20 – 22 ). In this study, a modified k -value model developed by Saha et al is adopted that considers the various degrees of slab-base interface bond.…”

mentioning

confidence: 99%

Development of an Artificial Neural Network-Based k-Value Prediction Model to Improve the Sensitivity of Base Layer on Rigid Pavement Performance

Saha

Luo

et al. 2023

Transportation Research Record: Journal of the Transportation R

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The performance of rigid pavement is greatly affected by the properties of the base/subbase and subgrade layer. However, the performance predicted by the AASHTOWare Pavement Mechanistic-Empirical (ME) Design shows low sensitivity to the properties of base and subgrade layers. In this study, a new set of modified models, that is, resilient modulus ( MR) and modulus of subgrade reaction ( k-value) are adopted to better reflect these layers’ influence on the overall performance. An artificial neural network (ANN) model is developed to predict the modified k-value based on finite element (FE) analysis. The training and validation data sets in the ANN model consist of 27,000 simulation cases with different combinations of pavement layer thickness, layer modulus, and slab-base interface bond ratio. Eight pavement section data are collected from the long-term pavement performance (LTPP) database and modeled using the FE software ISLAB2000 to evaluate the sensitivity of the modified MR model and k-values to pavement performance. The computational results indicate that the modified MR values have a higher sensitivity to water content in the base layer on fatigue cracking (bottom-up and top-down cracking) and the faulting performance of rigid pavements compared with the results using the Pavement ME design model. It is also observed that the k-values using the ANN model have a greater sensitivity to cracking and faulting performance as a result of changes in any bonded conditions (fully bonded, partially bonded, zero bonded), whereas the Pavement ME design model can only calculate at two extreme bonding conditions (i.e., fully bonded and zero bonded).

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Informal Discussion. The Revision of Road Note 29: A Guide to the Structural Design of Pavements for New Roads. 18 March, 1971.

Cited by 3 publications

References 0 publications

The Influence of Block Thickness on the Performance of Asphalt Paving Blocks

The Influence of Block Thickness on the Performance of Asphalt Paving Blocks

The Effect of The Bearing Capacity of Sub-Grade Soil on The Thickness and Cost of The Superstructure of Chip Seals

Development of an Artificial Neural Network-Based k-Value Prediction Model to Improve the Sensitivity of Base Layer on Rigid Pavement Performance

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