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固化温度对采用死烧氧化镁制备的MgO-SiO-H₂O体系性能的影响

Effect of Curing Temperature on the Properties of a MgO-SiO-HO System Prepared Using Dead-Burned MgO.

作者信息

Cheng Fuan, Hu Yaru, Song Qiang, Nie Jiao, Su Jiahao, Chen Yanxin

机构信息

College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.

出版信息

Materials (Basel). 2022 Sep 1;15(17):6065. doi: 10.3390/ma15176065.

DOI:10.3390/ma15176065
PMID:36079446
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9457786/
Abstract

The hydration of M-S-H prepared using silica fume (SF) and dead-burned MgO cured at 20 °C, 50 °C, and 80 °C was investigated, and the properties and performance of this M-S-H were measured. The formation of M-S-H was characterized using XRD, FTIR, TGA, and Si MAS-NMR. Results show that the compressive strength of paste prepared using MgO calcined at 1450 °C for 2 h reached 25 MPa after 28 d. The shrinkage of mortar made with low reactivity MgO was lower than that made with high reactivity MgO. The pH value of MgO/SF paste mixed with dead-burned MgO did not exceed 10.4 at room temperature. The shrinkage of M-S-H prepared using dead-burned MgO was less than that prepared using more active MgO, and its strength did not decrease over time. No (or only a small amount of) Mg(OH) was formed, which is why the strength of M-S-H prepared with dead-burned MgO continually increased, without decreasing. The promotion of curing temperature favor process of MgO hydration and is beneficial for degree of silica polymerization. The sample cured in 50 °C water showed the highest relative degree of reaction.

摘要

研究了在20℃、50℃和80℃下养护的由硅灰（SF）和死烧氧化镁制备的M-S-H的水化情况，并测定了该M-S-H的性能。使用XRD、FTIR、TGA和Si MAS-NMR对M-S-H的形成进行了表征。结果表明，使用在1450℃煅烧2小时的氧化镁制备的浆体在28天后抗压强度达到25MPa。低活性氧化镁制成的砂浆的收缩率低于高活性氧化镁制成的砂浆。与死烧氧化镁混合的氧化镁/硅灰浆体在室温下的pH值不超过10.4。使用死烧氧化镁制备的M-S-H的收缩率小于使用活性更高的氧化镁制备的M-S-H，并且其强度不会随时间降低。未形成（或仅形成少量）氢氧化镁，这就是为什么用死烧氧化镁制备的M-S-H强度持续增加而不降低的原因。养护温度的提高有利于氧化镁的水化过程，并且有利于二氧化硅的聚合程度。在50℃水中养护的样品显示出最高的相对反应程度。

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