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Improved microstructure and compressive strength of pastes and mortars containing MgO-SiO2 cement produced by combined calcination of MgCO3 and kaolin
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-28 , DOI: 10.1016/j.cemconcomp.2025.105959
J.P.B. Batista, G.C. Cordeiro, L.F. Ribeiro, J.C.B. Moraes
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-28 , DOI: 10.1016/j.cemconcomp.2025.105959
J.P.B. Batista, G.C. Cordeiro, L.F. Ribeiro, J.C.B. Moraes
MgO-SiO2 cement was produced by combined calcination of MgCO3 and kaolin as raw materials, at a MgCO3/kaolin mass ratio of 75/25 and 800 ºC for 45 min. Separate calcination of MgCO3 and kaolin was also conducted under the same conditions. Raw materials were characterized based on their chemical composition, bulk density, particle size distribution, XRD, FTIR, and BET specific surface area, and the MgO-SiO2 cement produced was analyzed using XRD, FTIR, SEM/EDS, BET specific surface area, and particle size distribution. Pastes were produced to characterize microstructure and the reaction process (XRD, FTIR, TGA, isothermal calorimetry, chemical shrinkage, and SEM/EDS), and mortars to assess compressive strength. The results of BET and SEM/EDS analyses of the cements confirmed that combined calcination increased particle adhesion. Microstructural analyses of pastes after 28 days of curing at 25 ºC showed the formation of a dense matrix of M-A-S-H reaction product, with aluminum incorporated into the M-A-S-H structure; brucite and hydrotalcite were also generated after the reaction process. Paste reaction results demonstrated that combined calcination produced cement with a higher degree of reaction after 72 h at 25 ºC. The highest compressive strength (42.0 MPa) in mortars obtained by combined calcination was recorded after 28 days of curing at 25 ºC, 223% higher than that of separately calcined cement (13.0 MPa). As such, this study successfully applied combined calcination to produce a more strength MgO-SiO2 cement.
中文翻译:
改善了通过 MgCO3 和高岭土联合煅烧生产的含有 MgO-SiO2 水泥的浆料和砂浆的微观结构和抗压强度
以 MgCO 3 和高岭土为原料,以 MgCO3/高岭土质量比为 75/25 和 800 ºC 的 45 分钟,以 MgCO3/高岭土质量比联合煅烧制得 MgO-SiO2 水泥。在相同条件下,还进行了 MgCO3 和高岭土的单独煅烧。根据原材料的化学成分、堆积密度、粒度分布、XRD、FTIR 和 BET 比表面积对原材料进行表征,并使用 XRD、FTIR、SEM/EDS、BET 比表面积和粒度分布分析所制备的 MgO-SiO2 水泥。生产浆料以表征微观结构和反应过程(XRD、FTIR、TGA、等温量热法、化学收缩和 SEM/EDS),并生产砂浆以评估抗压强度。水泥的 BET 和 SEM/EDS 分析结果证实,联合煅烧增加了颗粒粘附力。在 25 ºC 下固化 28 天后浆料的微观结构分析表明,形成致密的 M-A-S-H 反应产物基质,其中铝掺入 M-A-S-H 结构中;反应过程后还生成水镁石和水滑石。糊状反应结果表明,在 25 ºC 下 72 h 后,联合煅烧生成的水泥反应程度更高。在 25 ºC 下养护 28 天后,通过联合煅烧获得的砂浆中的抗压强度最高 (42.0 MPa),比单独煅烧水泥 (13.0 MPa) 高 223%。因此,本研究成功地应用了联合煅烧法生产了强度更高的 MgO-SiO2 水泥。
更新日期:2025-01-28
中文翻译:
改善了通过 MgCO3 和高岭土联合煅烧生产的含有 MgO-SiO2 水泥的浆料和砂浆的微观结构和抗压强度
以 MgCO 3 和高岭土为原料,以 MgCO3/高岭土质量比为 75/25 和 800 ºC 的 45 分钟,以 MgCO3/高岭土质量比联合煅烧制得 MgO-SiO2 水泥。在相同条件下,还进行了 MgCO3 和高岭土的单独煅烧。根据原材料的化学成分、堆积密度、粒度分布、XRD、FTIR 和 BET 比表面积对原材料进行表征,并使用 XRD、FTIR、SEM/EDS、BET 比表面积和粒度分布分析所制备的 MgO-SiO2 水泥。生产浆料以表征微观结构和反应过程(XRD、FTIR、TGA、等温量热法、化学收缩和 SEM/EDS),并生产砂浆以评估抗压强度。水泥的 BET 和 SEM/EDS 分析结果证实,联合煅烧增加了颗粒粘附力。在 25 ºC 下固化 28 天后浆料的微观结构分析表明,形成致密的 M-A-S-H 反应产物基质,其中铝掺入 M-A-S-H 结构中;反应过程后还生成水镁石和水滑石。糊状反应结果表明,在 25 ºC 下 72 h 后,联合煅烧生成的水泥反应程度更高。在 25 ºC 下养护 28 天后,通过联合煅烧获得的砂浆中的抗压强度最高 (42.0 MPa),比单独煅烧水泥 (13.0 MPa) 高 223%。因此,本研究成功地应用了联合煅烧法生产了强度更高的 MgO-SiO2 水泥。