Restriction of RAP% in HMA Based on Aggregate Gradation and Binder Properties
The use of recycled asphalt pavement (RAP) in pavement construction reduces the project cost and helps in conserving the naturally occurring aggregates. To incorporate RAP in hot mix asphalt, it is vital to know the amount and quality of the reclaimed binder. Three new asphalt binders were selected...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | CivilEng |
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| Online Access: | https://www.mdpi.com/2673-4109/2/3/44 |
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| author | Bharath Gottumukkala Sudhakar Reddy Kusam Vivek Tandon Amaranatha Reddy Muppireddy Ramya Sri Mullapudi |
| author_facet | Bharath Gottumukkala Sudhakar Reddy Kusam Vivek Tandon Amaranatha Reddy Muppireddy Ramya Sri Mullapudi |
| author_sort | Bharath Gottumukkala |
| collection | DOAJ |
| description | The use of recycled asphalt pavement (RAP) in pavement construction reduces the project cost and helps in conserving the naturally occurring aggregates. To incorporate RAP in hot mix asphalt, it is vital to know the amount and quality of the reclaimed binder. Three new asphalt binders were selected for this investigation. RAP material from one source was blended in different proportions with VG-10 and VG-30. Penetration, softening point, G */sin δ, G * sin δ and binder fatigue life Nf (from Linear Amplitude Sweep test) values of different blends were compared. The milled RAP aggregate gradation varied from source to source due to factors such as the gradation of the mix used in the existing layer, milling method and processing of RAP material. This variability controls the use of higher proportions of RAP in new mixes. To investigate the effect of RAP gradation on the proportion of RAP that can be used in the new mix, RAP sources with different gradation (three dense and two gap gradations) were selected. The proportion of RAP that can be used for preparing mixes with these gradations varied significantly with the source of RAP, and the target gradation. In most cases, it was found that allowable RAP percentages are smaller for the gap gradations compared to those permitted for dense gradations. The proportion of RAP in a mix can be increased by selecting an appropriate gradation for a RAP source or by using a suitable RAP source for a given gradation. |
| first_indexed | 2024-03-10T07:47:24Z |
| format | Article |
| id | doaj.art-65dba88d35294cff8dad3e6ffada3549 |
| institution | Directory Open Access Journal |
| issn | 2673-4109 |
| language | English |
| last_indexed | 2024-03-10T07:47:24Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | CivilEng |
| spelling | doaj.art-65dba88d35294cff8dad3e6ffada35492023-11-22T12:31:46ZengMDPI AGCivilEng2673-41092021-09-012381182210.3390/civileng2030044Restriction of RAP% in HMA Based on Aggregate Gradation and Binder PropertiesBharath Gottumukkala0Sudhakar Reddy Kusam1Vivek Tandon2Amaranatha Reddy Muppireddy3Ramya Sri Mullapudi4Flexible Pavement Division, Central Road Research Institute, New Delhi 110025, IndiaCivil Engineering Department, Indian Institute of Technology, Kharagpur 721302, IndiaCivil Engineering Department, University of Texas, El-Paso, TX 79968, USACivil Engineering Department, Indian Institute of Technology, Kharagpur 721302, IndiaCivil Engineering Department, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502284, IndiaThe use of recycled asphalt pavement (RAP) in pavement construction reduces the project cost and helps in conserving the naturally occurring aggregates. To incorporate RAP in hot mix asphalt, it is vital to know the amount and quality of the reclaimed binder. Three new asphalt binders were selected for this investigation. RAP material from one source was blended in different proportions with VG-10 and VG-30. Penetration, softening point, G */sin δ, G * sin δ and binder fatigue life Nf (from Linear Amplitude Sweep test) values of different blends were compared. The milled RAP aggregate gradation varied from source to source due to factors such as the gradation of the mix used in the existing layer, milling method and processing of RAP material. This variability controls the use of higher proportions of RAP in new mixes. To investigate the effect of RAP gradation on the proportion of RAP that can be used in the new mix, RAP sources with different gradation (three dense and two gap gradations) were selected. The proportion of RAP that can be used for preparing mixes with these gradations varied significantly with the source of RAP, and the target gradation. In most cases, it was found that allowable RAP percentages are smaller for the gap gradations compared to those permitted for dense gradations. The proportion of RAP in a mix can be increased by selecting an appropriate gradation for a RAP source or by using a suitable RAP source for a given gradation.https://www.mdpi.com/2673-4109/2/3/44reclaimed asphalt pavementtarget gradationaggregate gradation |
| spellingShingle | Bharath Gottumukkala Sudhakar Reddy Kusam Vivek Tandon Amaranatha Reddy Muppireddy Ramya Sri Mullapudi Restriction of RAP% in HMA Based on Aggregate Gradation and Binder Properties CivilEng reclaimed asphalt pavement target gradation aggregate gradation |
| title | Restriction of RAP% in HMA Based on Aggregate Gradation and Binder Properties |
| title_full | Restriction of RAP% in HMA Based on Aggregate Gradation and Binder Properties |
| title_fullStr | Restriction of RAP% in HMA Based on Aggregate Gradation and Binder Properties |
| title_full_unstemmed | Restriction of RAP% in HMA Based on Aggregate Gradation and Binder Properties |
| title_short | Restriction of RAP% in HMA Based on Aggregate Gradation and Binder Properties |
| title_sort | restriction of rap in hma based on aggregate gradation and binder properties |
| topic | reclaimed asphalt pavement target gradation aggregate gradation |
| url | https://www.mdpi.com/2673-4109/2/3/44 |
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