| MgO活性对新型水化硅酸镁水泥性能的影响 |
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| 引用本文： | 周凌峰,林旭健,王威.MgO活性对新型水化硅酸镁水泥性能的影响[J].硅酸盐通报,2023,42(1):57-65. |
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| 作者姓名： | 周凌峰 林旭健 王威 |
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| 作者单位： | 1.福州大学土木工程学院,福州 350108;2.湖南交通工程学院,交通运输工程学院,衡阳 421001 |
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| 基金项目： | 国家自然科学基金(52279126) |
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| 摘 要： | 通过对原料轻烧氧化镁粉在不同温度下进行二次恒温煅烧1.5 h制备不同活性MgO,研究了不同活性MgO与硅灰(SF)和磷酸氢二钾(K2HPO4)所制备的新型水化硅酸镁水泥胶凝材料(又称水化磷硅酸镁水泥,MSPHC)的凝结时间、流动度、抗压强度、反应溶液pH值。结合X射线衍射(XRD)、热重分析(TG-DTG)和扫描电子显微镜(SEM)测试手段,分析其影响机理。结果表明:随着煅烧温度的升高,MgO衍射峰强度增大,MgO活性降低;活性越高的MgO制备的MSPHC净浆凝结时间越短且流动性越差,而活性适中MgO制备的MSPHC具有较好的力学性能。MSPHC最主要的水化产物是水化硅酸镁(M-S-H)凝胶,另外还有Mg(OH)2和MgKPO4·6H2O(MKP)生成,原料轻烧氧化镁粉中的MgCO3成分不参与体系反应。活性适中的MgO制备的MSPHC在28 d龄期内的水化产物M-S-H凝胶生成量最多,因此硬化体抗压强度最高。活性越高的MgO在MSPHC反应体系中溶解的速度越快,体系水化反应进程速度也越快。
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| 关 键 词： | 水化硅酸镁(M-S-H) MgO活性 磷酸氢二钾(K2HPO4) 力学性能 水化产物 |
| 收稿时间： | 2022-08-26 |
Effect of MgO Reactivity on Properties of New Magnesium Silicate Hydrate Cement |
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| ZHOU Lingfeng,LIN Xujian,WANG Wei.Effect of MgO Reactivity on Properties of New Magnesium Silicate Hydrate Cement[J].Bulletin of the Chinese Ceramic Society,2023,42(1):57-65. |
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| Authors: | ZHOU Lingfeng LIN Xujian WANG Wei |
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| Affiliation: | 1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China;2. College of Traffic and Transportation Engineering, Hunan Institute of Traffic Engineering, Hengyang 421001, China |
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| Abstract: | In this paper, the MgO with different reactivity was prepared by the secondary constant temperature calcination of the raw material light burned magnesium oxide powder for 1.5 h at different temperatures. The setting time, fluidity, compressive strength and reaction solution pH value of a new type of magnesium silicate hydrate cement cementitious materials (also known as magnesium silicate phosphate hydrate cement, MSPHC) prepared with different reactivity MgO, silica fume (SF) and dipotassium hydrogen phosphate (K2HPO4) were investigated. The mechanism was analyzed through X-ray diffraction (XRD), thermogravimetric analysis (TG-DTG) and scanning electron microscopy (SEM). The results show that with the increase of calcination temperature, the intensity of MgO diffraction peak increases and the reactivity decreases. The faster the setting time and poorer the fluidity of the MSPHC purified slurry prepared by MgO with higher reactivity, while the MSPHC prepared with moderate reactivity MgO can achieve better mechanical properties. The most important hydration product of MSPHC is magnesium silicate hydrate (M-S-H) gel, besides, Mg(OH)2 and MgKPO4·6H2O (MKP) are also generated. The MgCO3 component in the raw material light burned magnesium oxide powder does not participate in the system reaction.MSPHC prepared by MgO with moderate activity has the highest hydration product M-S-H gel generation within 28 d of age, so the hardened body has the highest compressive strength. The higher the reactivity of MgO in the MSPHC reaction system is, the faster the dissolution rate is, the faster the hydration reaction process is. |
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| Keywords: | magnesium silicate hydrate (M-S-H) MgO reactivity dipotassium hydrogen phosphate (K2HPO4) mechanical property hydration product |
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