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Effect of the accelerated carbonation treatment on the recycled sand physicochemical characteristics through the rolling carbonation process
Journal of CO2 Utilization ( IF 7.7 ) Pub Date : 2020-05-06 , DOI: 10.1016/j.jcou.2020.101181
Glaydson Simoes dos Reis , Bogdan Grigore Cazacliu , Riccardo Artoni , Jean-michel Torrenti

Accelerated carbonation was employed to improve the physicochemical properties of the recycled sand through CO2 sequestration by a method called rolling carbonation. The carbonation process was fully evaluated by varying some parameters such (i) moisture of the sand, (ii) rotation speed, (iii) recycled sand amount in the reactor, (iv) initial internal pressure, and (v) partial CO2 pressure.

The rolling speed, initial moisture content, and mass amount played an important role in CO2 sequestration. The best rolling carbonation condition (at atmospheric pressure and 7 h) was at 4% of moisture, 500 g, and 100 rpm, under such conditions an increasing mass of 23.0 mg/g was reached while at the static condition was 5.0 mg/g. However, when the internal pressure increases from 1.014 to 1.4 bar an increase of more than double in the CO2 sequestration was reached, from 23.0 to 47.5 mgCO2 per gram of recycled sand. Phenolphthalein test indicated that rolling carbonation efficiently carbonated the entire aggregates with at least 6.0 mm of particle size.

The rolling system yielded rounded aggregates with less rough-textured surfaces which can provide better workability when used in producing new concrete. The water absorption capacity in the carbonated samples was lower than that of non-carbonated while the densities were higher in the carbonated samples.

The results showed that rolling carbonation is an interesting method for improving recycled sand physicochemical properties.



中文翻译:

滚动碳化法加速碳化处理对再生砂理化特性的影响

加速碳化被用于通过称为滚动碳化的方法通过CO 2螯合来改善再生砂的物理化学性质。通过改变一些参数来全面评估碳酸化过程,这些参数包括:(i)砂的水分,(ii)转速,(iii)反应器中的再生砂量,(iv)初始内部压力和(v)CO 2分压。

轧制速度,初始含水量和质量在螯合CO 2中起重要作用。最佳滚动碳化条件(在大气压和7 h下)是在4%的水分,500 g和100 rpm的条件下,在这种条件下增加的质量达到23.0 mg / g,而在静态条件下为5.0 mg / g 。但是,当内部压力从1.014 bar增加到1.4 bar时,CO 2的固存增加了两倍以上,从每克再生砂23.0到47.5 mgCO 2。酚酞测试表明,滚动碳化有效地碳化了至少6.0 mm粒径的整个聚集体。

滚动系统产生的圆形集料表面粗糙程度较低,在用于生产新混凝土时可以提供更好的可加工性。碳酸化样品中的吸水能力低于非碳酸化样品,而密度较高。

结果表明,滚动碳化是一种提高再生砂理化性质的有趣方法。

更新日期:2020-05-06
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