Investigation on performance of basic magnesium sulfate cement mortar

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

Advances in Cement Research Pub Date : 2023-01-20 DOI:10.1680/jadcr.22.00091

Xun Xu, Yingjiang Li, Yongtao Sun, B. Yu, Hai-long Hu, Dan Li, Zong-Hai Hu, Shuang Wang, J. Meng, Bowen Yu

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Abstract

Basic magnesium sulfate cement was a kind of MgO-MgSO4-H2O modified ternary system cementitious material, which was prepared from light burned magnesia, magnesium sulfate heptahydrate, water and additives. In this paper, the effects of α-MgO/MgSO4, H2O/MgSO4, sand-to-binder ratio and superplasticizer dosage on the performance of basic magnesium sulfate cement mortar were studied for the first time. The results showed that for the 28-day flexural strength, the optimal α-MgO/MgSO4 was 10:1, H2O/MgSO4 was 16:1, sand-to-binder ratio was 0.8, and superplasticizer dosage was 0.3%. For the 28-day compressive strength, the optimal α-MgO/MgSO4 was 8:1, H2O/MgSO4 was 14:1, sand-to-binder ratio was 0.6, and superplasticizer dosage was 0.4%. For water resistance, the optimal α-MgO/MgSO4 was 12.5:1, H2O/MgSO4 was 14:1, sand-to-binder ratio was 0.2, and superplasticizer dosage was 0.1%. Based on the above experiment, the basic mix proportion range of basic magnesium sulfate cement mortar was α-MgO/MgSO4 of 8:1∼12.5:1, H2O/MgSO4 of 14:1∼16:1, sand-to-binder ratio of 0.2∼0.6 and superplasticizer dosage of 0.1∼0.4%.

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碱式硫酸镁水泥砂浆性能研究

碱式硫酸镁水泥是以轻烧镁、七水合硫酸镁、水和外加剂为主要原料制备的一种MgO-MgSO4-H2O改性三元体系胶凝材料。本文首次研究了α-MgO/MgSO4、H2O/MgSO4、砂胶比和高效减水剂用量对碱式硫酸镁水泥砂浆性能的影响。结果表明:对于28天抗弯强度，最佳α-MgO/MgSO4为10:1,H2O/MgSO4为16:1，砂胶比为0.8，高效减水剂用量为0.3%;对于28 d抗压强度，最佳α-MgO/MgSO4为8:1,H2O/MgSO4为14:1，砂胶比为0.6，高效减水剂用量为0.4%。抗水性最佳α-MgO/MgSO4为12.5:1,H2O/MgSO4为14:1，砂胶比为0.2，高效减水剂用量为0.1%。根据上述试验，碱式硫酸镁水泥砂浆的基本配合比范围为α-MgO/MgSO4为8:1 ~ 12.5:1,H2O/MgSO4为14:1 ~ 16:1，砂胶比为0.2 ~ 0.6，高效减水剂用量为0.1 ~ 0.4%。

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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.