Evaluation of Crack Potency in the Bituminous Concrete using Fracture Mechanics Parameters

S. Sk
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Abstract

Fatigue cracking is very critical among all types of distresses in pavements once the fatigue crack start in pavement it led to fast pavement deterioration and thus reduced the life of pavement and quality of riding on pavement. Thus, to control such distress it is necessary to understand the mechanics behind such crack initiation and propagation and to find the fracture parameters to choose best mixture to resist the failure. There are various methods to understand the fracture properties of the bituminous concrete (BC) mix. This paper describes the semi-circular bending test for BC mix, which was designed to be very effective, and user friendly. This method is adopted because it simulates the field conditions and its availability. Semi-circular samples of forty-eight were prepared out of which half was made of unmodified bitumen and the rest were made of plastic modified bitumen. These all samples were then tested at different loading rates and value of load at each deflection is measured. Two fracture parameters like fracture energy and stress intensity factor are evaluated. The plastic modified bituminous concrete shows that the value of energy is increased 2 to 3 times than the unmodified bituminous concrete at intermediate temperature. Hence, plastic modified bituminous concrete has the greater cracking resistance potential.
用断裂力学参数评价沥青混凝土裂缝强度
疲劳裂纹是路面各种病害中最为严重的一种,一旦路面产生疲劳裂纹,将导致路面的快速劣化,从而降低路面的使用寿命和骑行质量。因此,为了控制这种破坏,有必要了解这种裂纹萌生和扩展背后的机理,并找到断裂参数,以选择最佳的混合物来抵抗破坏。了解沥青混凝土(BC)混合料断裂性能的方法多种多样。本文介绍了BC混合料的半圆弯曲试验,该试验设计有效,操作方便。该方法模拟了现场条件,具有较好的实用性。制备了48个半圆形样品,其中一半由未改性沥青制成,其余由塑料改性沥青制成。然后在不同的加载速率下测试所有这些样品,并测量每次挠度时的加载值。对断裂能和应力强度因子两个断裂参数进行了评价。在中等温度下,塑性改性沥青混凝土的能量值比未改性沥青混凝土提高2 ~ 3倍。因此,塑性改性沥青混凝土具有更大的抗裂潜力。
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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