scholarly journals Seasonal Performance Evaluation of Pavement Base Using Recycled Materials

2021 ◽  
Vol 13 (22) ◽  
pp. 12714
Author(s):  
Yang Zhang ◽  
Bora Cetin ◽  
Tuncer B. Edil
Keyword(s):  
Fly Ash ◽  
Recycled Concrete ◽  
Ride Quality ◽  
Concrete Aggregate ◽  
Traffic Loading ◽  
Pavement Base ◽  
Natural Aggregates ◽  
Long Term Performance ◽  
Term Performance

Using recycled pavement materials to construct new pavement base is currently an important construction strategy bringing improved sustainability. This study investigates the long-term performance of pavement bases constructed with recycled concrete aggregate (RCA), reclaimed asphalt pavement (RAP), and blends with natural aggregates in a seasonal frost region. The stabilization effect of fly ash on RAP was studied as well. In situ falling weight deflectometer (FWD) tests were routinely conducted to provide seasonal deflection data, which were used to back-calculate the layer modulus. Seasonal changes in the base layer modulus along with the pavement ride quality were monitored. One of the two lanes at the test sections was consistently subjected to traffic loading, whereas the other one was not. Findings from this field research indicated that after undergoing over 8 years of naturally seasonal freeze-thaw conditions, 100% RCA, 50% RCA, plus 50% natural aggregates, and 100% RAP, presented improved performance over 100% natural aggregates. However, 50% RAP blended with 50% natural aggregates performed comparably to natural aggregates only, and fly ash did not provide considerable improvement on the long-term performance of 50% RAP plus 50% natural aggregate base. Seasonal climatic variations turned out to affect pavement performance more critically than traffic loading.

Long-Term Performance of Recycled Concrete Aggregate for Subsurface Drainage

2017 ◽  
Vol 31 (4) ◽  
pp. 04017015 ◽  
Author(s):  
Toni McCulloch ◽  
Donghoon Kang ◽  
Ryan Shamet ◽  
Seung Jae Lee ◽  
Boo Hyun Nam
Keyword(s):  
Subsurface Drainage ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Long Term Performance ◽  
Term Performance

Prediction of Bearing Lifetime Demands by Considering the Bridge Design and Location Parameters

2019 ◽  
Author(s):  
Minesh K. Patel ◽  
Georgios P. Balomenos
Keyword(s):  
Bridge Design ◽  
Traffic Loading ◽  
Location Parameters ◽  
Long Term Performance ◽  
Term Performance ◽  
Long Term Behavior ◽  
Bridge Bearings ◽  
Bearing Behavior ◽  
Over Time

<p>The <span>long-term performance and safety of bridges is of paramount importance. Researchers have placed significant focus on the degradation and deterioration of bridge materials such as steel and concrete, but significantly less is known about the long-term behavior of bridge bearings. Uncertainty in the bearing behavior over time leads to challenges about when the bearings should be inspected and potentially replaced. However, bearing demands vary greatly based on the design of the bridge (e.g. differences in bridge material, girder type, span, height, and location). This paper finds trends in lifetime bearing demands from seismic, thermal, and traffic loading when the bridge design and location parameters are considered. These results can be used to identify which of the parameters have the greatest influence on the lifetime bearing demands which can then be used, in turn, to evaluate bearing long-term performance.</span></p>

scholarly journals Design and Construction of Ultra-Thin Continuously Reinforced Concrete (UTCRC) on N1 near Hugenote Tunnell

2018 ◽  
Vol 199 ◽  
pp. 08002
Author(s):  
Steph Bredenhann ◽  
Johan van Heerden ◽  
Pieter Strauss ◽  
Phillip Joubert
Keyword(s):  
Reinforced Concrete ◽  
Material Design ◽  
Performance Comparison ◽  
Base Layer ◽  
Western Cape ◽  
Traffic Loading ◽  
North East ◽  
Long Term Performance ◽  
Term Performance

In 2009, the National Route 1 Section 1 between km 56.1 and km 61.5, located North East of Paarl in the Western Cape Province of South Africa, was rehabilitated and widened. As part of the rehabilitation and widening contract the downhill truck crawler lane was constructed as an experimental pavement section. This experimental pavement section was constructed with a 50 mm thick Ultra-Thin Continuously Reinforced Concrete Pavement (UTCRCP). Early in 2010 sections of the experimental UTCRCP started to fail and consequently necessitated repair. In October 2014 a service provider was appointed for the special maintenance of the truck crawler lane on the National Route 1 Section 1. The project called for the reinstatement of the failed experimental UTCRCP with a re-engineered UTCRCP and a Enrobé à Module Élevé (EME) asphalt base layer with an Ultra-Thin Friction Course (UTFC), at various locations along the southbound (downhill) truck crawler lane. The project objective was specifically formulated to enable a long term performance comparison of both the re-engineered UTCRCP and the EME with UTFC under repeated traffic loading. The focus of this paper is the documentation and assessment of the initial pavement (structural analysis) and material design process, the construction of the UTCRCP, with cognizance of the challenges experienced during construction as well as the initial performance comparison. EME will not be discussed in this paper.

Study on Long Term Performance of Concrete of Slag-Alkali Higher Calcium Fly Ash

2006 ◽  
Vol 302-303 ◽  
pp. 98-104
Author(s):  
Ming Tang ◽  
Xiao Li
Keyword(s):  
Fly Ash ◽  
Orthogonal Design ◽  
Concrete Specimen ◽  
Mixture Ratio ◽  
Dispersion Degree ◽  
Set Up ◽  
Long Term Performance ◽  
Term Performance ◽  
Mixture Ratio Design

The slag-alkali is used to activate the activity of higher calsium fly ash. By the designs of the mixture ratio and the quadratic regression orthogonal design, the best combination is sought out. Several mixture factors which affect the rule of the concrete material properties and long term performance are researched. The mathematic models which are set up by the mixture ratio design with the quadralic regression orthogonal design can be effective. The precision is high. The strength of the concrete of slag-alkali fly ash was still increasing after 8 year. The dispersion degree of those specimens is small. The SEM photo of cracked specimen and early concrete specimen shows the surface of fly ash in 7 days concrete is slick and that in 8 years old specimen has been enwrapped tightly by much hydrate plant.

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