Understanding the State Agency Policies toward RAP Usage in the United States: State of Practice

IF 4.6 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Recycling Pub Date : 2023-12-18 DOI:10.3390/recycling8060100
Venkatsushanth Revelli, Ayman Ali
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Abstract

The usage of Reclaimed Asphalt Pavement (RAP) material is a highly resource-conservative, economical, and sustainable practice in flexible pavement construction. However, its usage in hot mix asphalt (HMA) is capped at 25% by the majority of state transportation agencies due to its aging levels, stiffness characteristics, and handling capabilities, which may result in early-age pavement distress. Though researchers suggest methodologies to increase RAP usage, higher RAP percentages in asphalt pavements require the support of state authorities. The main objective of this paper is to provide information on how different states design their mixtures with high RAP percentages. This study reviewed the current state of practice of fifty (50) state DOTs in the United States (US) with respect to RAP usage and the factors governing its regulations. It was observed that the limit of RAP content is mainly governed by traffic levels, gradation, binder content, and stiffness contributed by RAP and layer position in a pavement structure. The specifications also suggest that apart from volumetric and performance justification, blending charts, fractionation, and virgin binder grade selection would facilitate the use of higher RAP content in HMA. Controlled mixture design abiding by state specifications can increase the allowable RAP to 40–100%.
了解美国国家机构对使用 RAP 的政策:实践状况
在柔性路面施工中,使用再生沥青路面(RAP)材料是一种高度节约资源、经济且可持续的做法。然而,由于再生沥青的老化程度、刚度特性和处理能力可能会导致路面早期损坏,因此大多数州交通机构规定再生沥青在热拌沥青(HMA)中的使用率不得超过 25%。虽然研究人员提出了增加 RAP 使用量的方法,但提高沥青路面中的 RAP 使用比例需要州政府的支持。本文的主要目的是提供各州如何设计高 RAP 百分比混合料的信息。本研究回顾了美国五十(50)个州 DOT 在 RAP 使用方面的实践现状,以及制约其规定的因素。研究发现,RAP 含量的限制主要取决于交通量、级配、粘结剂含量、RAP 带来的刚度以及路面结构中的层位。规范还建议,除了体积和性能方面的理由外,掺合料图表、分级和原始粘结剂等级的选择都有助于在 HMA 中使用更高的 RAP 含量。遵守国家规范的受控混合料设计可将允许的 RAP 提高到 40-100%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Recycling
Recycling Environmental Science-Management, Monitoring, Policy and Law
CiteScore
6.80
自引率
7.00%
发文量
84
审稿时长
11 weeks
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