Experimental investigation on fatigue and fracture behaviour of cold recycling materials

Q1 Engineering

Transportation Engineering Pub Date : 2024-07-14 DOI:10.1016/j.treng.2024.100258

Ahmed Al-Mohammedawi, Konrad Mollenhauer

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Abstract

Cold Recycled Material (CRM) has emerged as a highly innovative road construction material, offering numerous advantages over conventional Hot Mix Asphalt (HMA), such as reduced construction costs, decreased energy consumption, and enhanced resistance to reflective cracking. CRM is primarily composed of Reclaimed Asphalt (RA) and bitumen emulsion, with the addition of cement as a co-binder. However, the presence of cement in CRM can lead to increased susceptibility to cracking under heavy traffic loads. In this study, the fracture-fatigue behaviour of CRM modified with by-product fillers was investigated in order to improve the overall performance of CRM mixtures. The Cyclic Indirect Tensile Fatigue test (CIT-CY) and Semi-Circular Bending (SCB) fracture tests were conducted on the CRM mixtures and mortars, respectively. The findings reveal that CRM materials incorporating specific fillers demonstrated a balanced combination of fatigue and fracture resistance, indicating the potential for these modified CRMs to enhance road construction applications.

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冷再循环材料的疲劳和断裂行为实验研究

冷再生材料（CRM）已成为一种极具创新性的筑路材料，与传统的热混合沥青（HMA）相比，它具有诸多优势，如降低施工成本、减少能源消耗、增强抗反射裂缝能力等。CRM 主要由再生沥青（RA）和沥青乳液组成，并添加水泥作为辅助粘结剂。然而，水泥在 CRM 中的存在会导致其在重交通负荷下更容易开裂。在本研究中，为了提高 CRM 混合物的整体性能，我们对使用副产品填料改性的 CRM 的断裂疲劳行为进行了研究。分别对 CRM 混合物和砂浆进行了循环间接拉伸疲劳试验（CIT-CY）和半圆形弯曲（SCB）断裂试验。研究结果表明，含有特定填料的 CRM 材料在抗疲劳性和抗断裂性方面表现出均衡的组合，这表明这些改性 CRM 具有提高道路建设应用的潜力。

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