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首页> 外文期刊>Construction and Building Materials >Laboratory performance of Recycled Asphalt Mixes containing wax and chemical based Warm Mix Additives using Semi Circular Bending and Tensile Strength Ratio tests
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Laboratory performance of Recycled Asphalt Mixes containing wax and chemical based Warm Mix Additives using Semi Circular Bending and Tensile Strength Ratio tests

机译：使用半圆形弯曲和拉伸强度比测试的含蜡和化学基热混合添加剂的再生沥青混合料的实验室性能

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摘要

Durability and sustainability are two major requirements of the asphaltic pavement structure. Durability aspect may involve performance parameters such as fracture property, moisture sensitivity etc., whereas, sustainability aspect may involve utilization of Recycled Asphalt Pavement (RAP) and Warm Mix Additive (WMA) in the conventional asphaltic mixture. Though improvement in high temperature performance may be expected with the addition of RAP due to its stiffer nature, it may degrade intermediate temperature performance. Additionally, RAP utilization may also increase the mixing and compaction temperature during the construction phase. Therefore, researchers have recommended using different WMA additives to decrease production temperature of mixes containing RAP. Though the use of WMA additives with RAP may decrease mixing and compaction temperature, their effects on various performance parameters of the asphaltic mixture must be evaluated. Sufficient research works have been reported on the performance of RAP and WMA mixes at high temperature, however, so far, limited work is available on understanding effects of RAP and WMA additives on fatigue and moisture sensitivity of asphalt mixture. Therefore, the present research work aimed at evaluating intermediate temperature fracture properties and moisture sensitivity of asphaltic mixture containing RAP and WMA. Five different RAP contents (0%, 10%, 20%, 30%, and 40%), two different types of WMA additives (2% wax based "Sasobit" and 0.5% chemical based "Evotherm") and one without WMA additive (Control mixture) were considered. Fracture properties of different asphaltic mixture combinations were evaluated using Semi Circular Bending (SCB) test. Improvement in fracture property of Control mixture was observed with increase in RAP content, however, the addition of wax based and chemical based WMA additives showed an overall reduction in fractured resistance. Further, the asphaltic mixture containing wax based WMA additive showed better fracture performance compared to the corresponding mixture containing chemical based WMA additive. Similarly, moisture sensitivity of asphaltic mixtures was evaluated using Tensile Strength Ratio (TSR) approach. Addition of both WMA additives resulted in lowered Indirect Tensile Strength (ITS) under dry as well as wet condition. Though the addition of WMA additive showed a negative impact on moisture sensitivity, all mixture considered in the present research work passed the minimum TSR requirement. Therefore, wax and chemical based WMA additive may deem acceptable from moisture sensitivity point of view. (C) 2017 Elsevier Ltd. All rights reserved.
机译：耐久性和可持续性是沥青路面结构的两个主要要求。耐久性方面可能涉及性能参数，例如断裂性能，湿度敏感性等，而可持续性方面可能涉及在常规沥青混合料中利用再生沥青路面（RAP）和热拌添加剂（WMA）。尽管由于RAP具有更坚硬的性质，可以预期通过添加RAP可以提高高温性能，但它可能会降低中间温度性能。此外，在施工阶段，RAP的利用还会增加混合和压实温度。因此，研究人员建议使用不同的WMA添加剂来降低含有RAP的混合物的生产温度。尽管将WMA添加剂与RAP一起使用可能会降低混合和压实温度，但必须评估它们对沥青混合物各种性能参数的影响。关于RAP和WMA混合料在高温下的性能，已经进行了充分的研究工作，但是，到目前为止，了解RAP和WMA添加剂对沥青混合料的疲劳和湿度敏感性的影响的工作还很有限。因此，本研究工作旨在评估含RAP和WMA的沥青混合料的中间温度断裂特性和湿气敏感性。五种不同的RAP含量（0％，10％，20％，30％和40％），两种不同类型的WMA添加剂（2％蜡基“ Sasobit”和0.5％化学剂“ Evotherm”）和一种不含WMA添加剂（对照混合物）被考虑。使用半圆弯曲（SCB）测试评估了不同沥青混合料组合的断裂性能。随RAP含量的增加，观察到控制混合物的断裂性能有所改善，但是，添加蜡基和化学基WMA添加剂则显示出整体抗断裂性降低。此外，与相应的含有化学基WMA添加剂的混合物相比，含有蜡基WMA添加剂的沥青混合物显示出更好的断裂性能。同样，使用拉伸强度比（TSR）方法评估了沥青混合料的水分敏感性。两种WMA添加剂的加入都会导致在干湿条件下的间接拉伸强度（ITS）降低。尽管加入WMA添加剂对湿度敏感性有负面影响，但本研究工作中考虑的所有混合物均通过了最低TSR要求。因此，从湿度敏感性的角度来看，蜡和化学基WMA添加剂可能被认为是可以接受的。 （C）2017 Elsevier Ltd.保留所有权利。

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