摘要
应用断裂潜能和临界应力强度因子KIC的概念,研究了在开裂的沥青路面上加铺沥青面层时的抗裂性能,分析了玻璃纤维加筋沥青混凝土(GFRAC)、普通沥青混凝土以及抗滑面层的开裂行为。采用马歇尔试验与3点弯曲试验,选取有预切缝和无切缝两种试件进行试验,利用断裂潜能的概念评估沥青混凝土抑制裂缝产生的能力,并且测定了材料的临界应力强度因子。研究表明,加入玻璃纤维能有效地提高沥青混合料稳定度,改善沥青混凝土的高温抗变形能力。
The glass fiber reinforced asphalt overlay was studied in view of crack propagation resistance, its laboratorial tests and numerical calculations were carried out. The behavior of fiber reinforced asphalt concrete (FRAC),plain asphalt concrete and the skid resistance asphalt course were discussed depending on Marshall Test, three point binding test using both notched and unnotched specimens. The concept of the potential fracture energy was introduced to determine asphalt concrete capability to resist crack initiation. The material critical stress intensity factor or fracture toughness was determined. The results indicate that the glass fiber reinforced asphalt concrete can improve the stability and the deformability of the asphalt concrete with no increaseing bitumen content of HMA, which will be beneficial to prevent rutting and bleeding in high temperature degrees during the hot season. The potential fracture energy gives a simple and an effective criterion to determine the resistance of the material against crack initiation. Glass FRAC has greater potential energy to resist cracking in asphalt overlay. High potential fracture energy value shows that the material’s resistance to crack initiation is high. The critical stress intensity factor for glass FRAC is higher than that for plain asphalt concrete, which indicates stronger resistance to crack propagation. 6 tabs, 15 figs, 6 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第3期28-32,共5页
Journal of Chang’an University(Natural Science Edition)
