Construction Quality Control of Unbound Base Course using Light Weight Deflectometer where Reclaimed Asphalt Pavement Aggregate is Used as an Example

2020 ◽  
Vol 2674 (10) ◽  
pp. 989-1002
Author(s):  
Emre Akmaz ◽  
Saad Ullah ◽  
Burak F. Tanyu ◽  
Erol F. Guler
Keyword(s):  
Quality Control ◽  
Asphalt Pavement ◽  
Field Measurements ◽  
Design Criteria ◽  
Reclaimed Asphalt Pavement ◽  
Light Weight ◽  
Reclaimed Asphalt ◽  
Light Weight Deflectometer ◽  
Base Course ◽  
Unbound Aggregate

Reclaimed asphalt pavement (RAP) is already being recycled as a construction and building material. One of the commonly considered applications is to create an unbound aggregate from this material. However, since the particles of RAP have binder coatings, traditional quality control procedures applied during construction such as use of a nuclear density gauge does not provide accurate results. Therefore there is a need to find another method that can be applied during construction to confirm that the placement in the field meets the design criteria. For this reason, in this study, the suitability of using light weight deflectometer (LWD) has been investigated. The presented methodology outlines how to implement the use of LWD to create a target modulus in the laboratory as part of design criteria and compare with the field measurements. In the field, depending on the thickness of the constructed aggregate layer, the LWD measurements may be influenced by more than just the layer of interest. The presented methodology also provides a solution for such multilayer conditions. Although the study primarily focuses on using RAP as the investigated material, the methodology developed in this study can be applied to any type of unbound aggregate as demonstrated in this study.

scholarly journals Evaluation performance of base course mixture containing reclaimed asphalt pavement (RAP)

2018 ◽  
Vol 162 ◽  
pp. 01037 ◽  
Author(s):  
Karim Al helo ◽  
Zaynab Qasim ◽  
Ahmed Majeed
Keyword(s):  
Asphalt Pavement ◽  
Stability Test ◽  
Reclaimed Asphalt Pavement ◽  
Test Results ◽  
Reclaimed Asphalt ◽  
Superpave Gyratory Compactor ◽  
Asphalt Mix ◽  
Asphalt Content ◽  
Base Course ◽  
Durability Performance

This paper presented the effect of addition of Reclaimed Asphalt Pavement (RAP) on performance of mixture with (20%, 30%, 40% and 50%) RAP as proportion of asphalt mix. To compare with virgin mixture marshall flow and stability test was used to evaluated durability performance with (0,1,3, and 7) days immersion and Wheel Truck test was used to evaluated the resist to rutting. The best gradation and optimum asphalt content was selected according to Superpave system. Superpave Gyratory Compactor (SGC) was used to compact mixture with 100-mm diameter. The test results indicated that addition of RAP to mixes showed significant increase on resistance of Durability and Rutting.

scholarly journals Use of Reclaimed Asphalt Pavement in Conjunction with Ground Improvement: A Case History

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Kevin C. Foye
Keyword(s):  
Asphalt Pavement ◽  
Ground Improvement ◽  
Reclaimed Asphalt Pavement ◽  
Improvement Program ◽  
Laboratory Findings ◽  
Reclaimed Asphalt ◽  
Parking Lot ◽  
Base Course ◽  
Accepted Practice ◽  
Technical Construction

The use of Reclaimed Asphalt Pavement (RAP) in lieu of virgin crushed stone aggregate is becoming a widely accepted practice for a number of construction applications, particularly pavement base courses. A number of laboratory RAP studies have considered the mechanical properties of RAP bases in order to support pavement designs incorporating RAP. These studies have revealed a number of interesting relationships between RAP moisture content, compaction, and stiffness. This paper discusses the experiences of a design-build contractor integrating a geosynthetic ground improvement program with a RAP base during the reconstruction of a 1.95 ha asphalt parking lot. Field observations of base course construction with RAP explore some of the implications of laboratory findings. A number of interesting observations on the technical, construction, and economic issues resulting from the project challenges and the use of RAP are presented.

Optimal proportioning for hot recycled mix design under Superpave mix design consideration

2009 ◽  
Vol 36 (9) ◽  
pp. 1470-1477 ◽  
Author(s):  
Aravind Krishna Swamy ◽  
Animesh Das
Keyword(s):  
Asphalt Pavement ◽  
Optimal Solution ◽  
Mix Design ◽  
Design Criteria ◽  
Reclaimed Asphalt Pavement ◽  
Design Consideration ◽  
Reclaimed Asphalt ◽  
Total Material ◽  
Mix Proportion ◽  
Fixed Parameter

While performing recycled (central plant) hot mix design as per Superpave mix design criteria, the quantity of reclaimed asphalt pavement (RAP) is either assumed fixed, or estimated from other fixed parameter(s). In either of the cases, the constituent (RAP, virgin binder, and virgin aggregates) proportions may not necessarily represent a cost-optimal situation. The present paper develops a generalized formulation for preliminary constituent proportioning of hot recycled mix following Superpave criteria. Through this formulation an optimal solution for mix proportion can be obtained, where the total material cost is minimized while satisfying all the binder and mix property requirements.

The Research of the Feasibility of Using Reclaimed Asphalt Pavement as a Material for Regenerated Low-Density Pervious Concrete

2013 ◽  
Vol 723 ◽  
pp. 703-710
Author(s):  
Sunn Jer Hwang ◽  
Chyi Sheu ◽  
Ying Wei Liu ◽  
Hsien Chou Chen
Keyword(s):  
Compressive Strength ◽  
Asphalt Pavement ◽  
Underground Water ◽  
Pervious Concrete ◽  
Reclaimed Asphalt Pavement ◽  
Low Density ◽  
Reclaimed Asphalt ◽  
Cement Binder ◽  
Strength Material ◽  
Base Course

The research is to compound (1) the Reclaimed Asphalt Pavement (RAP) with the asphalt penetration less than 15 (25°C, 5sec, 100g) and the gravel aggregates of the base course adopted from the existing roads, and (2) the cement binder into Regenerated Low-Density Pervious Concrete (RLDPC) whose the compressive strength is between 25 to 50 (kgf/cm2) and whose permeable capacity (ml/15sec) is greater than 600. The results show the RLDPC used as the pavement gravel gradation layer or as Controlled Low Strength Material (CLSM) that is more advantageous on (1) reducing the costs of re-filling pavement, (2) enhancing the durability of roads, and (3) increasing the flowing space of underground water.

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