Optimum tack coat rate for different asphalt geosynthetic interlayers to achieve optimum shear bond strength

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-04-26 DOI:10.1016/j.geotexmem.2024.04.004

N.S. Correia , M.P.S. Silva , A. Shahkolahi

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Abstract

Designing geosynthetics for asphalt overlay is challenging due to the diversity of paving composites and paving geogrids available on the market. Challenges remains on the ideal product and tack coat to avoid debonding failure and to increase bonding quality. This research evaluates interface shear strength properties of geosynthetic-asphalt concrete specimens using seven geosynthetic interlayers tested under different tack coat rates based on asphalt retention of geosynthetics. Leutner shear tests were conducted on laboratory-prepared asphalt concrete specimens under different interface combinations. Index asphalt retention of paving geosynthetics depended on various parameters including geosynthetics type, geotextile backing, thickness and coating. The study suggests 100% of asphalt retention of the composite as design tack rate for paving geocomposites and paving geogrid composites with permanent porous fabric backing, while 220% asphalt retention as tack coat rate is suggested for geogrids. The optimum tack coat for reinforcement composites with light fabric backing falls between the optimum tack coat rates for composites and grids. The study also showed that the interface shear bond is a complex property and is not necessarily related to the fabric backing being permanent or temporary, the mass of the fabric backing, and the geosynthetics coating type and bitumen content individually.

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不同沥青土工合成材料夹层达到最佳剪切粘结强度的最佳粘涂率

由于市场上的铺路复合材料和铺路土工格栅种类繁多，为沥青面层设计土工合成材料具有很大的挑战性。如何选择理想的产品和粘涂层，以避免脱粘故障并提高粘结质量，仍然是一个难题。这项研究评估了土工合成材料-沥青混凝土试样的界面剪切强度特性，根据土工合成材料的沥青留着率，使用七种土工合成材料夹层在不同的粘层率下进行了测试。对实验室制备的沥青混凝土试样进行了不同界面组合下的鲁特纳剪切试验。摊铺土工合成材料的沥青留着率指数取决于各种参数，包括土工合成材料类型、土工织物背衬、厚度和涂层。研究建议将铺路土工复合材料和铺路土工格栅复合材料的 100%沥青留着率作为永久多孔织物背衬的设计粘着率，而将土工格栅的 220%沥青留着率作为涂层粘着率。以轻质织物为背衬的加固复合材料的最佳粘涂层率介于复合材料和格栅的最佳粘涂层率之间。研究还表明，界面剪切粘结是一种复杂的特性，与织物背衬的永久性或临时性、织物背衬的质量以及土工合成材料涂层类型和沥青含量没有必然联系。

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来源期刊

Geotextiles and Geomembranes 地学-地球科学综合

CiteScore

9.50

自引率

21.20%

发文量

111

审稿时长

59 days

期刊介绍： The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.