Wu Yuxiao, Shi Peini, Yang Qingsong, Zhang Na
School of Civil & Environmental Engineering and Geography Science, Ningbo University, No. 818, Fenghua Street, Ningbo 315211, China.
Ningbo Key Laboratory of Energy Geostructure, Ningbo 315211, China.
Materials (Basel). 2024 Jul 23;17(15):3628. doi: 10.3390/ma17153628.
As one of the raw materials of basic magnesium sulfate cement (BMSC), the activity of light-burned magnesium oxide (MgO) has an important effect on the hydration rate, hydration products, and mechanical properties of BMSC. To reveal the influence of packaging method, storage environment, and storage time on the activity of MgO and the mechanical properties of BMSC, an experiment was conducted by using ordinary woven bags, peritoneal woven bags, and plastic and paper compound bags to store the finished BMSC and the raw materials (light-burned MgO, MgSO·7HO, fly ash, and a chemical additive) under the conditions of natural environment, sealed environment, and wet environment, respectively. Comparative analysis of the effects of packaging method, storage conditions, and storage time on the activity of MgO and the mechanical properties of BMSC was performed through the mechanical strength test of mortar specimens. The results showed that in a sealed environment, the loss of a-MgO content in light-burned MgO was minimized, which was more conducive to keeping the mechanical properties of BMSC stable. In the wet environment, the mechanical strength of BMSC was significantly reduced in the early stage (1 day) due to the significant reduction in the activity of MgO, and the mechanical strength of the finished BMSC and prepared BMSC after 120 days of storage was still lost, regardless of the packaging method. However, the storage environment and packaging method had relatively little effect on the late mechanical strength (28 days) of BMSC. It is advisable to use ordinary woven bags for packaging in natural and sealed environments as this is more economical for engineering applications. Plastic and paper compound bags are superior to ordinary woven bags and peritoneal woven bags in wet environments.
作为碱式硫酸镁水泥（BMSC）的原材料之一，轻烧氧化镁（MgO）的活性对BMSC的水化速率、水化产物及力学性能有着重要影响。为揭示包装方式、储存环境和储存时间对MgO活性及BMSC力学性能的影响，分别采用普通编织袋、腹膜编织袋以及塑料和纸复合袋，在自然环境、密封环境和潮湿环境条件下储存成品BMSC及其原材料（轻烧MgO、MgSO·7HO、粉煤灰和一种化学添加剂），进行了实验。通过砂浆试件的力学强度试验，对包装方式、储存条件和储存时间对MgO活性及BMSC力学性能的影响进行了对比分析。结果表明，在密封环境中，轻烧MgO中α-MgO含量的损失最小，更有利于保持BMSC力学性能的稳定。在潮湿环境中，由于MgO活性显著降低，BMSC的力学强度在早期（1天）显著降低，且无论采用何种包装方式，储存120天后成品BMSC和制备的BMSC的力学强度仍有损失。然而，储存环境和包装方式对BMSC后期（28天）力学强度的影响相对较小。在自然和密封环境中建议使用普通编织袋进行包装，因为这在工程应用中更经济。在潮湿环境中，塑料和纸复合袋优于普通编织袋和腹膜编织袋。
