Preparation and mechanism of Portland cement-based CO2 foam concrete
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摘要: 煤电一体化基地运行产生大量CO2引起的环境问题引起了极大的关注。利用坑口电厂CO2制备泡沫混凝土材料不仅可应用于矿井充填，而且可实现坑口电厂CO2的原位处理。为此，研发了一种兼具高强与固碳特性的CO2泡沫混凝土材料，并探索了硅酸盐水泥基CO2泡沫混凝土（CFC）的制备机理。通过碳酸化预处理水泥和物理发泡方式制备了硅酸盐水泥基CO2泡沫混凝土，采用扫描电子显微镜（SEM）和傅里叶变换红外光谱仪（FTIR）、万能试验机、热重分析方法（TG）分别进行微观表征、力学性能测试、固碳能力测试，对CO2对CFC干密度、孔隙率、抗压强度及固碳性能的影响规律及作用机理进行研究，分析了硅酸盐水泥中CO2泡沫消泡机制，讨论了CO2发泡硅酸盐水泥基混凝土机理。试验结果表明：得益于CO2养护作用，CFC抗压强度明显提高；碳酸化预处理后CFC的7 d抗压强度提高44.6%，28 d抗压强度提高27.7%；碳酸化预处理可明显改善CFC泡孔结构，提高CFC的发泡效果，碳酸化预处理后CFC的孔隙率增大7.38%；CFC骨架的固碳率为5.70%~8.08%，具有明显的固碳潜力，但CFC制备工艺及参数仍需进一步改善以满足矿用需求。研究发现：硅酸钙矿物相与CO2的矿化反应是CO2泡沫消泡的主要原因，通过碳酸化预处理硅酸盐水泥浆体降低体系中硅酸钙矿物相及其水化产物含量、提高碳酸钙含量是制备CFC的关键。Abstract: The environmental problems caused by the large amount of CO2 generated in the operation of coal-electricity integration base have attracted a great concern. The foam concrete material prepared from the CO2 generated in the pithead power plant can be used for mine filling, and can realize the in-situ treatment of the CO2 of the pithead power plant. Therefore, a CO2 foam concrete material with high strength and carbon fixation characteristics was developed, and the preparation mechanism of CO2 foam concrete (CFC) based on Portland cement was explored. The CO2 foam concrete based on Portland cement was prepared by carbonation pretreatment cement and physical foaming. Scanning electron microscopy (SEM)and Fourier transform infrared spectroscopy (FTIR)were used for microscopic characterization. Universal testing machine was used to test mechanical properties. Thermogravimetric analysis (TG)was used to measure the carbon fixation capacity. The effect of CO2 on the dry density, porosity, compressive strength and carbon retention of CFC was studied. The defoaming mechanism of CO2 foam in Portland cement was analyzed, and the mechanism of CO2 foaming Portland cement based concrete was discussed. The experimental results show that the compressive strength of CFC was significantly improved due to CO2 curing. After carbonation pretreatment, the 7 d compressive strength of CFC increased by 44.6%, and the 28 d compressive strength increased by 27.7%. Carbonation pretreatment could significantly improve the cellular structure and foaming effect of CFC, and the porosity of CFC increased by 7.38% after carbonation pretreatment. The carbon fixation rate of CFC skeleton was 5.70%-8.08%, which has obvious carbon fixation potential. However, the preparation process and parameters of CFC still need to be further improved to meet the needs of mining. It was found that the mineralization reaction of calcium silicate mineral phase and CO2 is the main reason for the defoaming of CO2 foam. The key to the preparation of CFC is to reduce the content of calcium silicate mineral phase and its hydration products in the system by carbonation pretreatment of Portland cement slurry, and increase the content of calcium carbonate.
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1. 他旭鹏，张源，万志军，曹钊，李建伟，李绪萍，陈景序，张靖. 超临界CO_2发泡混凝土的制备及固碳性能研究. 煤炭学报. 2024(10): 4222-4234 . 
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