Gaudenzi Elena, Canestrari Francesco, Lu Xiaohu, Cardone Fabrizio
Department of Civil and Building Engineering and Architecture, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy.
Nynas AB, SE-149 82 Nynäshamn, Sweden.
Materials (Basel). 2021 Feb 15;14(4):918. doi: 10.3390/ma14040918.
Nowadays, the growing energy costs and pressing worldwide demand for petroleum-based products create a strong need to develop alternative binders deriving from green and renewable sources. Bio-binders (or bitumen added to bio-based materials) can potentially be a viable alternative for the production of bituminous mixture, promoting the circular economy as well as environmental sustainability principles without reducing the overall performance of the mixture. In this context, the current study focuses on evaluation of the effects of a bio-binder on the mechanical response of asphalt concrete (AC) produced with it. In particular, a 10% bio-oil deriving from a by-product of the paper industry has been blended with a conventional 50/70 penetration grade bitumen to obtain the bio-binder. Moreover, plain bitumen having the same consistency was chosen to produce a reference AC. Two dense-graded AC wearing courses were prepared in the laboratory according to Italian technical specifications. A mechanical characterization in terms of indirect tensile strength, indirect tensile stiffness modulus, fatigue response and permanent deformation resistance was performed on gyratory compacted specimens using both conventional and performance tests. In addition, aging and water sensitivity of the AC specimens were evaluated. Overall results highlight that the AC produced with the bio-binder did not show reduced mechanical properties and it was comparable to the reference AC regardless of aging and water conditioning. This highly encourages the use of bio-binder as a viable alternative in asphalt technology.
如今，不断上涨的能源成本以及全球对石油基产品的迫切需求，使得人们强烈需要开发源自绿色可再生资源的替代粘结剂。生物粘结剂（或添加到生物基材料中的沥青）有可能成为生产沥青混合料的可行替代品，在不降低混合料整体性能的情况下，促进循环经济以及环境可持续性原则。在此背景下，当前的研究聚焦于评估一种生物粘结剂对用其生产的沥青混凝土（AC）力学响应的影响。具体而言，将一种源自造纸工业副产品的10%生物油与一种常规的50/70针入度等级沥青混合，以获得生物粘结剂。此外，选择具有相同稠度的普通沥青来生产参考AC。根据意大利技术规范在实验室制备了两种密级配AC磨耗层。使用常规试验和性能试验，对旋转压实试件进行了间接拉伸强度、间接拉伸劲度模量、疲劳响应和抗永久变形方面的力学特性表征。此外，还评估了AC试件的老化和水敏感性。总体结果表明，用生物粘结剂生产的AC并未表现出力学性能降低，并且无论老化和水条件如何，它都与参考AC相当。这极大地鼓励了在沥青技术中使用生物粘结剂作为一种可行的替代品。
