Mechanical behavior of self-compacting concrete pavements incorporating recycled tire rubber crumb and reinforced with polypropylene fiber
Mechanical behavior of self-compacting concrete pavements incorporating recycled tire rubber crumb and reinforced with polypropylene fiber
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DOI：
10.1016/j.jclepro.2016.04.079
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发表时间：
2016-10-01
影响因子：
11.1
通讯作者：
Emadi, Seyed Amir Ali
中科院分区：
文献类型：
--
作者：
Hesami, Saeid;Hikouei, Iman Salehi;Emadi, Seyed Amir Ali
越来越多的废轮胎是火灾和健康危害的潜在来源。橡胶路面被认为是解决当前世界环境和经济危机的有前途和可持续的解决方案之一。本研究的重点是寻找以轮胎橡胶废料为组成材料生产铺装混凝土的最佳方法。因此，在自密实混凝土配合比设计中，采用轮胎橡胶屑（TRC）作为部分替代砂（5%、10%和15%）的材料。自密实混凝土（SCC）被认为是一种节能材料；因为它减少了现场工作，不需要任何压实能量。本研究选用细度模量为2.9、比重为2.64 （g/cm(3)）、吸水率为1.5%的细骨料和最大粒径为12.7 mm、比重为2.68 （g/cm(3)）、吸水率为0.8的粗骨料。根据本研究的结果，新拌混凝土试验表明，纤维和TRC对新拌混凝土的流变性能都有负面影响。此外，硬化混凝土试验表明，TRC降低了SCC的抗压强度、抗拉强度、抗折强度、磨粒强度和弹性模量，增加了SCC的吸水率。因此，在含TRC的SCC试件中加入聚丙烯纤维，可以显著提高试件的抗压、抗拉、抗弯和耐磨性，但对试件的弹性模量没有显著影响。此外，基于超声波速的评价，橡胶SCC中纤维的存在降低了吸水率。(C) 2016 Elsevier Ltd.版权所有。
Increasing quantity of scrap tires are potential sources of fire and health hazards. Rubberized pavement is being considered as one of the promising and sustainable solutions to this current environmental and economic crisis in the world. This research focused on finding the best way of producing paving concrete with the use of tire rubber waste as a component material. Therefore, Tire Rubber Crumb (TRC) was used as a partial sand replacement (5%, 10% and 15%) material in the mix design of self-compacting concrete. Self-compacting concrete (SCC) is considered an energy efficient material; because it reduces on-site working and does not need any compacting energy. Fine aggregates with fineness modulus of 2.9, specific gravity of 2.64 (g/cm(3)) and water absorption of 1.5% and coarse aggregates with maximum size of 12.7 mm, specific gravity of 2.68 (g/cm(3)) and water absorption of 0.8 were used in this research. According to the results of this study, fresh concrete tests showed that both fiber and TRC have negative effects on rheological properties of fresh concrete. Furthermore, the hardened concrete tests showed that TRC decreases compressive strength, tensile strength, flexural strength, abrasive strength and modulus of elasticity while increasing water absorption of SCC. Therefore, polypropylene fibers were added into SCC specimens containing TRC and resulted in significant increases in compressive, tensile, flexural and abrasion strength but had no considerable effect on the modulus of elasticity of these specimens. Moreover, the presence of fiber in rubberized SCC decreased water absorption based on evaluation of ultrasonic waves velocity. (C) 2016 Elsevier Ltd. All rights reserved.