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Effect of mineral additives and two-stage mixing on the performance of recycled aggregate concrete
Journal of Material Cycles and Waste Management ( IF 3.1 ) Pub Date : 2020-05-12 , DOI: 10.1007/s10163-020-01048-9
Rayhan Md. Faysal , Mohammed Maslehuddin , Mohammed Shameem , Shamsad Ahmad , Saheed Kolawole Adekunle

There is an increasing tendency to use recycled aggregate to produce concrete due to diminishing sources of natural aggregate. The properties of recycled aggregate concrete (RAC) are inferior to that of normal aggregate concrete. Several strategies including the use of supplementary cementitious materials (SCMs) are adopted to improve the properties of RAC. The two-stage mixing approach (TSMA) is also used as an improvement strategy. The present study was aimed to examine the individual and combined effects of using SCMs and TSMA on the fresh and hardened properties of RAC. Three SCMs, namely, fly ash, ground granulated blast furnace slag, and silica fume were used with and without TSMA. The experimental data indicated the beneficial effect of SCMs and TSMA on workability, strength, shrinkage, and durability of RAC. Further, the cost per unit strength of the RAC with SCMs and TSMA was less than that of RAC without any treatment. The use of developed RAC will lead to technical, economic, and environmental benefits.



中文翻译:

矿物添加剂和两阶段混合对再生骨料混凝土性能的影响

由于天然骨料的来源减少,使用再生骨料生产混凝土的趋势正在增加。再生骨料混凝土(RAC)的性能不及普通骨料混凝土。采取了包括使用辅助胶凝材料(SCM)在内的几种策略来改善RAC的性能。两阶段混合方法(TSMA)也用作改进策略。本研究旨在检查使用SCM和TSMA对RAC的新鲜和硬化特性的单独和组合影响。在有和没有TSMA的情况下,使用了三种SCM,即飞灰,磨碎的高炉矿渣和硅粉。实验数据表明,SCM和TSMA对RAC的可加工性,强度,收缩率和耐久性具有有益的作用。进一步,带有SCM和TSMA的RAC的单位强度成本低于未经任何处理的RAC。使用发达的RAC将带来技术,经济和环境效益。

更新日期:2020-05-12
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