Durability of reclaimed asphalt pavement–coal fly ash–carbide lime blends under severe environmental conditions

2018 ◽  
Vol 21 (2) ◽  
pp. 557-569 ◽  
Author(s):  
Nilo Cesar Consoli ◽  
Hugo Carlos Scheuermann Filho ◽  
Vinicius B. Godoy ◽  
Caroline M. De Carli Rosembach ◽  
J. Antonio H. Carraro
Keyword(s):  
Fly Ash ◽  
Environmental Conditions ◽  
Asphalt Pavement ◽  
Coal Fly Ash ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt

scholarly journals Development of Mix Designs for Minimally Refined Reclaimed Asphalt Pavement (RAP) Concrete for Florida Concrete Test Road

2018 ◽  
Vol 10 (8) ◽  
pp. 2598 ◽  
Author(s):  
Sangyoung Han ◽  
Hung-Wen Chung ◽  
Thanachart Subgranon ◽  
Mang Tia
Keyword(s):  
Fly Ash ◽  
Asphalt Pavement ◽  
Preliminary Test ◽  
American Concrete Institute ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Cement Replacement ◽  
Florida Department ◽  
Test Road ◽  
Pavement Concrete

The main objective was to develop mix designs for concrete incorporating minimally processed reclaimed asphalt pavement (RAP) materials to be used in the Florida Concrete Test Road. The laboratory program was conducted in two phases. Phase I involved testing of twelve (12) trial mixes to identify feasible mixes which could meet the Florida Department of Transportation (FDOT) specification requirements for pavement concrete. Based on the preliminary test results from the trial mixes, ten (10) production mixes were identified and evaluated more extensively in Phase II to establish the optimum concrete mixes incorporating RAP to be recommended. Concrete mixtures, with 0% to 40% RAP as aggregate replacement and using 20% fly ash and 50% slag as cement replacement, were designed using the optimized aggregate gradation (OAG) technique instead of the American Concrete Institute (ACI) method. Among the RAP concrete evaluated, the 20% RAP concrete mixes with 0%, 20% fly ash, and 50% slag as cement replacement were able to meet Florida Department of Transportation’s (FDOT) over-design compressive strength of 29 MPa (4200 psi) at 28 days. Using 20% and 40% RAP in concrete could result in saving in the total cost of aggregate by 9% and 17%, respectively. When the RAP is not refined (e.g., no washing of RAP, and no separating of coarse and fine portions), it is recommended that 20% of RAP can be used as aggregate replacement in pavement concrete.

scholarly journals ASPHALT CONCRETE MIXTURE PRODUCED USING RECLAIMED ASPHALT PAVEMENT AND FLY ASH AS ARTIFICIAL AGGREGATE AND FILLER

2021 ◽  
Vol 83 (4) ◽  
pp. 17-29
Author(s):  
Ari Widayanti ◽  
Ria Asih Aryani Soemitro ◽  
Januarti Jaya Ekaputri ◽  
Hitapriya Suprayitno
Keyword(s):  
Fly Ash ◽  
Water Absorption ◽  
Asphalt Concrete ◽  
Asphalt Pavement ◽  
High Water ◽  
Reclaimed Asphalt Pavement ◽  
Infrastructure Development ◽  
Reclaimed Asphalt ◽  
Alkali Activator ◽  
High Water Absorption

This study presents the use of reclaimed asphalt pavement (RAP), and fly ash as artificial aggregate and filler in asphalt concrete. Because of the limited availability of natural materials, infrastructure development has become a concern. Therefore, it is necessary to reuse and recycle waste materials. One such innovation is artificial aggregates. The disadvantage of RAP is that its gradation exceeds the standard; its asphalt penetration and ductility exceed the requirements. The weaknesses of artificial aggregate are high water absorption, spherical shape, and low aggregate interlocking. In this study, the artificial aggregate was produced using the fly ash and alkali activator. Alkali activator consisted of Na2SiO3 and 8M NaOH at a ratio of 2.5. The mixtures containing different percentages of artificial aggregate (45, 55, 65, and 75%) were produced, and the fly ash filler content was 5%. Different tests including XRF, SEM, and Marshall tests were conducted. The artificial aggregate is hydrophilic owing to the high silica content; thus, it has high water absorption. This results in a low adhesion between the asphalt and aggregate. The best composition of asphalt concrete is 55% artificial aggregate, RAP, fly ash filler, and asphalt. The asphalt concrete containing artificial aggregate has high stability and is stiff and light. However, it requires a high asphalt content because of high water absorption. It is unsuitable for application in high traffic roads but suitable for medium traffic ones.

scholarly journals The Usage of Fly Ash for Reclaimed Asphalt Pavement (RAP), Asphalt Concrete Binder Course (AC-BC) Filler

2017 ◽  
Vol 0 (2) ◽  
pp. 23
Author(s):  
Ratna Handayani ◽  
Ria Asih Aryani Soemitro ◽  
Herry Budianto ◽  
Januarti Jaya Ekaputri
Keyword(s):  
Fly Ash ◽  
Asphalt Concrete ◽  
Asphalt Pavement ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt

Sodium chloride as a catalyser for crushed reclaimed asphalt pavement – Fly ash – Carbide lime blends

2018 ◽  
Vol 15 ◽  
pp. 13-19 ◽  
Author(s):  
Nilo Cesar Consoli ◽  
Davi Novicki Giese ◽  
Helena Batista Leon ◽  
Douglas Martins Mocelin ◽  
Raquel Wetzel ◽  
...  
Keyword(s):  
Fly Ash ◽  
Sodium Chloride ◽  
Asphalt Pavement ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt

Long-Term Durability Studies on Chemically Treated Reclaimed Asphalt Pavement Material as a Base Layer for Pavements

2017 ◽  
Vol 2657 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Anand J. Puppala ◽  
Aravind Pedarla ◽  
Bhaskar Chittoori ◽  
Vijay Krishna Ganne ◽  
Soheil Nazarian
Keyword(s):  
Fly Ash ◽  
Asphalt Pavement ◽  
Construction Material ◽  
El Paso ◽  
Base Material ◽  
The United States ◽  
Base Layer ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt

For several years reclaimed asphalt pavement (RAP) material has been used as a construction material in hot-mix asphalt (HMA) to reduce material costs and stabilize pavements. Of the 45 million tons of RAP produced every year in the United States, only 33% is being used in HMA. Recent studies have demonstrated that RAP can be used effectively in base layers when it is blended with aggregate base materials and stabilized with cement or fly ash additives. This adoption in the pavement base layer helps maximize the reutilization of RAP material and minimize its disposal in landfills, thereby making it an environmentally friendly practice. However, studies reported so far addressed only the strength and stiffness characteristics of stabilized RAP in base layers in the short term, and not many studies have addressed its long-term behavior. In this study the long-term durability of untreated as well as stabilized specimens was tested by conducting standard durability testing to replicate the moisture fluctuations in the field from seasonal variations. In addition, leachate studies were conducted to examine the effect of rainfall infiltration on the leachability of the cement or fly ash stabilizer from stabilized RAP mixtures. Durability studies revealed a very low volumetric change and good retaining strength at the end of three, seven, and 14 cycles for RAP material from the El Paso, Texas, area, and leachate tests proved that the leaching of cement or fly ash stabilizer from RAP mixes cannot be considered to be a concern for long-term performance. However, approximately 2 years of field infiltration were replicated in the laboratory in this study. Of the several RAP mixtures studied, the mixture composed of 60% RAP and 40% base material with 2% cement was identified as an effective long-term-performing mixture.

Evaluation of Fly ash Treated Reclaimed Asphalt Pavement for Base/Subbase Applications

2014 ◽  
Vol 45 (4) ◽  
pp. 401-411 ◽  
Author(s):  
Sireesh Saride ◽  
Deepti Avirneni ◽  
Sarath Chandra Prasad Javvadi ◽  
Anand Jagadeesh Puppala ◽  
Laureano Rene Hoyos
Keyword(s):  
Fly Ash ◽  
Asphalt Pavement ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt
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