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Properties of roller-compacted concrete pavement containing waste aggregates and nano SiO2
Construction and Building Materials ( IF 7.4 ) Pub Date : 2020-03-23 , DOI: 10.1016/j.conbuildmat.2020.118747
Davoud Tavakoli , Rahbar Sakenian Dehkordi , Hassan Divandari , Jorge de Brito

This study deals with the use of waste materials as replacement of fine aggregate in roller-compacted concrete pavement (RCCP). To achieve this, waste ceramic, waste concrete, and waste glass were initially crushed and mixed and then replaced natural fine aggregate at varying amounts in RCCP. Furthermore, to mitigate the probable negative effects of waste aggregates and also to improve the mechanical properties of cement paste, nano SiO2 was employed in the mixes design. After preparing the mixes, Vebe time, compressive strength, splitting tensile strength, water absorption, abrasion resistance, and skid resistance were measured. The results show that more than 40% of sand replacement with waste materials could have a negative effect on the properties of RCCPs. However, this impact is negligible up to 10% of waste material proportions. The compressive strength of the mixes containing waste materials was lower than that of the control mix, except for the sample containing 10% ceramic waste. In terms of water absorption, mixes with waste materials had higher water absorption than the control mix. Besides, abrasion somewhat increased as a result of adding waste materials, except for the samples containing 10% glass and 10% ceramic wastes that showed a slight decrease. Moreover, mixes with waste materials had higher skid resistance than the control mix. Overall, waste ceramic mixes showed better mechanical properties and waste glass mixes had better performance in terms of water absorption. In addition, using nano SiO2 leads to improve the mechanical properties of the RCCP; the optimum content of nano SiO2 has determined to be 0.7% of cement weight.



中文翻译:

含骨料和纳米SiO 2的碾压混凝土路面的性能

这项研究涉及使用废料代替碾压混凝土路面(RCCP)中的细骨料。为此,首先将废陶瓷,废混凝土和废玻璃粉碎并混合,然后在RCCP中以不同数量替换天然细骨料。此外,为了减轻废料的可能的负面影响,并改善水泥浆的机械性能,纳米SiO 2用于混合物设计。制备混合物后,测量了韦伯时间,抗压强度,抗张强度,吸水率,耐磨性和防滑性。结果表明,超过40%的用废料替代沙子可能会对RCCP的性能产生负面影响。但是,这种影响最多可忽略不计废料比例的10%。含有废料的混合物的压缩强度低于对照混合物的压缩强度,除了样品中含有10%的陶瓷废物。在吸水率方面,与废料的混合物比对照混合物具有更高的吸水率。此外,由于添加了废料,磨损有所增加,但含10%玻璃和10%陶瓷废料的样品略有减少。此外,与废料形成的混合物比对照混合物具有更高的防滑性。总体而言,废陶瓷混合物显示出更好的机械性能,而废玻璃混合物则具有更好的吸水性能。另外,使用纳米SiO2提高了RCCP的机械性能;纳米SiO 2的最佳含量已确定为水泥重量的0.7%。

更新日期:2020-03-26
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