Effects of magnesia in semi-hydraulic and non-hydraulic calcium silicate binders during carbonation curing
Effects of magnesia in semi-hydraulic and non-hydraulic calcium silicate binders during carbonation curing
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半水硬和非水硬硅酸钙粘结剂碳化养护过程中氧化镁的影响
DOI：
10.1016/j.conbuildmat.2022.127628
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发表时间：
2022
影响因子：
7.4
通讯作者：
Ashraf, Warda
中科院分区：
文献类型：
--
作者：
Khan, Rakibul I.;Siddique, Salman;Ashraf, Warda
本研究对矿渣、硅灰石和镁砂制备的碳化复合材料的力学和微观结构性能进行了深入的研究。含有不同剂量的矿渣、硅灰石和氧化镁的膏体批次在20%二氧化碳浓度、50℃温度和80%相对湿度下进行碳化养护。采用扫描电子显微镜(SEM)、动态蒸气吸附(DVS)、热重-质谱仪(TGA-MS)、傅立叶变换红外光谱(FTIR)和X射线衍射仪(XRD)对样品的微观结构进行了表征。观察到水合碳酸镁(HMCS)的形成，即针状菱镁矿、玫瑰花状水镁矿的形成，由于其膨胀性和形成相互连接的网络，增加了碳化基质的密度。随着氧化镁的加入，样品的总孔径和临界孔径分布发生了变化。在硅灰石和矿渣复合材料中掺入25%的镁砂，其抗压强度分别提高了44%和126%。此外，还观察到在碳化养护条件下，非水硬性硅灰石系统的性能要好于半水硬性矿渣系统。
This study presented an insight into the mechanical and microstructural properties of carbonated composites produced using slag, wollastonite, and magnesia. Paste batches containing various dosages of slag, wollastonite, and magnesia were subjected to carbonation curing regime at a concentration of 20% CO2, 50 °C temperature, and 80% relative humidity. The microstructure of the samples was evaluated using scanning electron microscopy (SEM), dynamic vapor sorption (DVS), thermogravimetric analysis (TGA) coupled with mass spectroscopy (MS), Fourier transformed infrared spectroscopy (FTIR), and X-ray diffraction (XRD). It was observed that the formation of hydrated magnesium carbonates (HMCs) i.e., needle shape nesquehonite, Rosset-like hydromagnesite have increased the carbonated matrix density due to its expansive nature and by forming an interconnected network. The change in total and critical pore size distribution was observed with the addition of magnesia. The compressive strengths were also observed to increase by 44% and 126% when 25% magnesia was incorporated into wollastonite and slag composites, respectively. Furthermore, it was observed that under carbonation curing non-hydraulic wollastonite system performed better when compared to semi-hydraulic slag system.
天然纯硅灰石和非纯硅灰石的碳化
影响因子：
2.6
作者：
Kristoff Svensson;A. Neumann;Flora Feitosa Menezes;C. Lempp;H. Pöllmann
通讯作者：
H. Pöllmann
影响因子：
3.2
作者：
L. Pu;C. Unluer
通讯作者：
C. Unluer
影响因子：
11.4
作者：
Khan, Rakibul I.;Ashraf, Warda;Olek, Jan
通讯作者：
Olek, Jan