Cement and Concrete Research ( IF 10.9 ) Pub Date : 2022-06-28 , DOI: 10.1016/j.cemconres.2022.106891 Peiliang Shen , Jianxin Lu , Yangyang Zhang , Yi Jiang , Shipeng Zhang , Chi Sun Poon
In this study, an innovative wet carbonation process was developed to prepare aragonite whisker-rich materials (AWM) from cement and simulated flue gas, which subsequently served as micro-fiber additions to cement. The parameters including temperature, duration and MgCl2 concentration governing the aragonite formation were investigated, and the formation mechanism was explored. The results showed that needle-like aragonite whisker with a single crystal length of 10–30 μm and diameter of 0.5–2 μm could be synthesized rapidly when the cement suspension containing 0.05 M/L MgCl2 was carbonated at 80 °C. The formation of aragonite was favored in a suspension with a high concentration of Ca2+ and a minimum Mg2+/Ca2+ molar ratio >0.12. Additionally, amorphous phases including alumina-silica gel and silica gel were also detected. By mixing the AWM with cement, a new type of micro-fiber reinforced cement was developed, which showed significant mechanical performance improvement and embodied CO2 content (25.3 %).
中文翻译:
水泥湿法碳化制备富含文石晶须的材料:制备微纤维增强水泥和封存二氧化碳
在这项研究中,开发了一种创新的湿法碳化工艺,用于从水泥和模拟烟气中制备富含文石晶须的材料 (AWM),随后将其用作水泥中的微纤维添加剂。研究了影响文石形成的温度、持续时间和MgCl 2浓度等参数,并探讨了其形成机制。结果表明,含0.05 M/L MgCl 2的水泥悬浮液在80 ℃碳化时,可以快速合成出单晶长10~30 μm、直径0.5~2 μm的针状文石晶须。在具有高浓度 Ca 2+和最小 Mg 2+ /Ca 2+的悬浮液中有利于文石的形成摩尔比 > 0.12。此外,还检测到了非晶相,包括氧化铝-硅胶和硅胶。通过将 AWM 与水泥混合,开发了一种新型的微纤维增强水泥,该水泥显示出显着的机械性能改进并体现了 CO 2含量(25.3 %)。