Evaluation of Bituminous Moisture Damage of High Silica Aggregate

IF 1.1 Q3 ENGINEERING, CIVIL

Civil and Environmental Engineering Pub Date : 2023-12-01 DOI:10.2478/cee-2023-0048

H. Aodah, Ameer H. M. Ali, Hasan S. Jawad, Maithan M. Abdulreda

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Abstract

Abstract Moisture damage (Stripping) in Hot Mix Asphalt (HMA) is the loss of adhesive bond between aggregate particles and bitumen due to water action. Most urban roads in Iraq have been exposed to moisture damage failure because of the high silica content in aggregate, this phenomenon led to a decrease in the service life of roads and an increase in maintenance cost. This study used two anti-stripping agents: hydrated lime and Wetfix-BE. Lime was added as a powder to the aggregate in a dosage of 2.0 % of the aggregate weight and Wetfix-BE, a liquid chemical adhesion promoter for hot and warm mix asphalt, was added to asphalt at in dosage of 0.5 % from the total weight of asphalt. The retained Marshall stability, tensile strength ratio, Texas boiling test, and static immersion test are calculated to determine the resistance to moisture damage. The results indicated that both Wetfix-BE and lime could increase Marshall retained stability, tensile strength, and resistance to moisture damage of mixtures, especially at higher condition temperatures. The bitumen modified with Wetfix-BE had better results than bitumen modified with lime for all tests at different temperatures.

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高硅骨料的沥青湿损评估

摘要热拌沥青（HMA）中的湿损害（剥离）是指骨料颗粒与沥青之间因水的作用而失去粘合力。由于骨料中二氧化硅含量较高，伊拉克的大多数城市道路都受到了湿害破坏，这种现象导致道路使用寿命缩短，维护成本增加。这项研究使用了两种防剥落剂：熟石灰和 Wetfix-BE。石灰以粉末状添加到集料中，添加量为集料重量的 2.0%；Wetfix-BE 是一种用于热拌沥青和温拌沥青的液态化学粘附促进剂，添加量为沥青总重量的 0.5%。通过计算保留的马歇尔稳定性、拉伸强度比、德克萨斯沸腾试验和静态浸泡试验来确定沥青的抗湿损性能。结果表明，Wetfix-BE 和石灰都能提高混合料的马歇尔稳定度、拉伸强度和抗湿害能力，尤其是在较高的条件温度下。在不同温度下的所有测试中，用 Wetfix-BE 改性的沥青比用石灰改性的沥青效果更好。

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

Civil and Environmental Engineering ENGINEERING, CIVIL-

CiteScore

2.00

自引率

58.30%

发文量