Vacková Pavla, Valentin Jan, Belhaj Majda
Department of Road Engineering, Faculty of Civil Engineering, Czech Technical University in Prague, 166 29 Prague, Czech Republic.
Materials (Basel). 2021 Feb 8;14(4):811. doi: 10.3390/ma14040811.
The paper presents the influence of laboratory aging simulation on fracture properties determined on 150 variants of asphalt mixtures. The fracture properties were determined by two different test approaches-semi-circular bending test (SCB test) and three-point bending test on beam specimens (3-PB test). The aging was simulated according to one of the methods defined in EN 12697-52 (storage of test specimens in chamber at temperature of 85 °C for 5 days). The evaluated group of variants covered asphalt mixtures for all road layers. The group was further divided according to used bituminous binder (unmodified vs. modified) and reclaimed asphalt content. The results showed that strength parameters (flexural strength and fracture toughness) increase with aging. It further shows that fracture work provides more complex information about the cracking behavior. For the aging indexes, it was found that for mixtures with modified binders and mixtures which did not contain reclaimed asphalt (RA), the values were higher. The aging indexes for fracture work showed different results for both performed tests.
本文介绍了实验室老化模拟对150种沥青混合料断裂性能的影响。断裂性能通过两种不同的试验方法来测定——半圆弯曲试验（SCB试验）和梁式试件三点弯曲试验（3-PB试验）。根据EN 12697-52中定义的方法之一模拟老化（将试件在85°C的试验箱中储存5天）。评估的混合料变体组涵盖了所有路面层的沥青混合料。该组进一步根据所用沥青结合料（未改性与改性）和再生沥青含量进行划分。结果表明，强度参数（抗弯强度和断裂韧性）随老化而增加。进一步表明，断裂功提供了关于开裂行为的更复杂信息。对于老化指数，发现对于使用改性结合料的混合料以及不含再生沥青（RA）的混合料，其值更高。两种试验中，断裂功的老化指数显示出不同的结果。
