INFLUENCE OF SODIUM OXIDE ON PROPERTIES OF FRESH AND HARDENED PASTE OF ALKALI-ACTIVATED BLAST-FURNACE SLAG
INFLUENCE OF SODIUM OXIDE ON PROPERTIES OF FRESH AND HARDENED PASTE OF ALKALI-ACTIVATED BLAST-FURNACE SLAG
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DOI：
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发表时间：
2010-12
影响因子：
1.7
通讯作者：
A. Allahverdi;Babak Shaverdi;E. N. Kani
中科院分区：
文献类型：
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作者：
A. Allahverdi;Babak Shaverdi;E. N. Kani
本工作的目的是研究氧化钠对伊斯法罕钢厂碱激发高炉矿渣新硬浆体性能的影响。将激发剂的二氧化硅模数(SiO_2/Na_2O)调整为0.6，并以此方式设计了若干混合物，以包含不同水平的氧化钠，包括干渣重量的1、2、3、4、5和6%。测试了浆体最重要的物理力学性能，包括工作性、初凝和终凝时间、28天抗压强度和风化严重程度。选择合适的混合料进行更多的研究，包括不同龄期的抗压强度、90天的自生收缩和干燥收缩。结果表明，随着混合料中氧化钠含量的增加，混合料的工作性增加，凝结时间缩短，抗压强度提高。结果表明，对于氧化钠含量为1%、2%和3%的混合料，28天的抗压强度分别达到27.5、50.0和70.0 Mpa。自收缩的测量值均小于0.1%，扫描电子显微镜研究表明，随着氧化钠浓度从1%增加到2%，孔径明显减小。
The aim of this work is to investigate the influence of sodium oxide on properties of fresh and hardened paste of alkali-activated blast furnace slag from Isfahan steel plant. The silica modulus (SiO2/Na2O) of activator was adjusted at 0.6 and a number of mixes were designed in such a way to contain different levels of sodium oxide including 1, 2, 3, 4, 5, and 6% by weight of dry slag. The most important physico-mechanical properties of the pastes including workability, initial and final setting times, 28-day compressive strength and efflorescence severity were measured. Suitable mixes were chosen for more studies including compressive strength at different ages, 90-day autogenous and drying shrinkages. According to the results, increasing the sodium oxide content of the mixes results in increased workability, reduced setting times, and higher compressive strength. The results confirm the possibility of achieving 28-day compressive strengths up to 27.5, 50.0 and 70.0 MPa for mixes with sodium oxide content of 1, 2 and 3 wt% respectively. The measured values for autogenous shrinkage were all less than 0.1% and SEM studies showed a significant decrease in pore sizes with increasing sodium oxide concentration from 1 to 2%.