Effects of compound mineral admixtures on properties of magnesium oxysulfate cement

IF 1.4 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Advances in Cement Research Pub Date : 2022-05-03 DOI:10.1680/jadcr.22.00006

Na Zhang, Hong-fa Yu, Hai-yan Ma, M. Ba, Haoxia Ma

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引用次数: 1

Abstract

Adding mineral admixtures is a green, economic and effective method to improve the properties of magnesium oxysulfate (MOS) cement. Based on modified MOS cement by low calcium fly ash (L-FA), high calcium fly ash (H-FA) and granulated blast furnace slag (G-BS), the effects of L-FA, H-FA and G-BS and SF double mixing on the properties of MOS cement were studied by characterizing the compressive strength, water resistance, hydration heat, hydration products and micropore structure characteristics, and the modification mechanism of mineral admixtures was discussed. The results show that the L-FA, G-BS and SF double mixing can further optimize the hydration product composition and micropore structure of MOS cement, thus improving its compressive strength and water resistance. The hydration reaction rate of MOS cement and 5·1·7 phase content in the hydration products is increased by H-FA and SF double mixing, but the micropore structure is not further optimized, which is the reason why the water resistance of MOS cement with H-FA and SF is not improved. The research results enrich the basic theory of mineral admixtures to improve the properties of MOS cement and provides theoretical guidance for its practical application.

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复合矿物掺合料对氧硫酸镁水泥性能的影响

添加矿物掺合料是改善氧硫酸镁（MOS）水泥性能的一种绿色、经济、有效的方法。以低钙粉煤灰（L-FA）、高钙粉灰（H-FA）和粒化高炉矿渣（G-BS）改性MOS水泥为基础，通过表征其抗压强度、耐水性、水化热、水化产物和微孔结构特征，研究了L-FA、H-FA、G-BS和SF双掺对MOS水泥性能的影响，并对矿物掺合料的改性机理进行了探讨。结果表明，L-FA、G-BS和SF的双掺可以进一步优化MOS水泥的水化产物组成和微孔结构，从而提高其抗压强度和耐水性。H-FA和SF的双重混合提高了MOS水泥的水化反应速率和水化产物中的5.1.7相含量，但微孔结构没有得到进一步优化，这就是H-FA和SFMOS水泥的耐水性没有得到改善的原因。研究成果丰富了矿物掺合料改善MOS水泥性能的基本理论，为其实际应用提供了理论指导。

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来源期刊

Advances in Cement Research 工程技术-材料科学：综合

CiteScore

3.70

自引率

5.00%

发文量

审稿时长

3.2 months

期刊介绍： Advances in Cement Research highlights the scientific ideas and innovations within the cutting-edge cement manufacture industry. It is a global journal with a scope encompassing cement manufacture and materials, properties and durability of cementitious materials and systems, hydration, interaction of cement with other materials, analysis and testing, special cements and applications.