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Influences of different curing methods on cement-lithium slag slurry hydration degree
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摘要: 为了分析水泥-锂渣浆体的水化程度, 采用高温煅烧法测试各龄期的化学结合水, 结果发现:水泥-锂渣浆体的化学结合水量随龄期的延长而增加, 水化3 d和7 d时能达到水化90 d时的60%和80%。高温养护、碱激发、高温和碱激发均能提高锂渣复合水泥基材料早期的化学结合水量, 最高可达3~4倍, 提高的幅度依次为碱激发和高温养护＞碱激发＞高温养护＞标准养护。高温和复合环境养护也能提高水泥的水化程度, 1~28 d内, 锂渣掺量在40%以内时, 水泥水化程度相对指数(ψ值)均大于1;掺量为60%时, ψ值均小于1。综上, 高温养护、碱激发、高温和碱激发均能提高锂渣和水泥的水化程度, 高温和碱激发复合作用时较为显著。Abstract: In order to analyze the hydration degree of the cement-lithium slag slurry, the chemically combined water is tested by high-temperature calcination at different ages. The testing results show that the chemically combined water of the cement-lithium slag slurry increases with prolongation of the age that can be able to achieve more than 60% and 80% for 90 d at 3 d and 7 d hydration degree, after then this increase becomes slower. The chemically combined water at 1 d is up to 3 to 4 times under the conditions of high temperature curing, alkali activation, high temperature and alkali activation (composite curing), which is better than standard curing. Relatively speaking, the effect of the 4 kinds of curing is in the order of composite curing >alkali activation> high temperature curing>standard curing. The chemically combined water of unit cement at 1~28 d is small by an equivalent chemically combined water method, the relative index (ψ value) of the cement hydration degree at 1~28 d is greater than 1 when the content of the lithium slag is less than 40%, and ψ value is less than 1 when the content of the lithium slag is 60% under high temperature curing and composite curing. In summary, the hydration degree of the cement and lithium slag can be improved by high temperature curing, alkali-activation and composite curing, and it is more significant in the composite curing period.
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Key words:
- curing method /
- cement /
- lithium slag /
- hydration degree
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图 1 标养下锂渣复合水泥基材料的化学结合水量
Figure 1. Combined water content of lithium slag composite binder under standard curing
图 2 高温(50 ℃和100 ℃)养护下锂渣复合水泥基材料的化学结合水量
Figure 2. Combined water content of lithium slag composite binder under 50 ℃ and 100 ℃ curing conditions
图 3 碱环境激发和碱与高温(50 ℃)养护下锂渣复合胶凝材料的化学结合水量
Figure 3. Combined water content of lithium slag composite binder under alkali activation and high temperature curing
图 4 考虑锂渣反应程度后水泥的化学结合水量
Figure 4. Combined water content of cement considering reaction degree of lithium slag
图 5 标准养护下水泥水化程度相对指数
Figure 5. Reaction degree relative index of cement under standard curing
图 6 高温养护下水泥水化程度相对指数
Figure 6. Reaction degree relative index of cement under high temperature curing
图 7 复合养护下水泥水化程度相对指数
Figure 7. Reaction degree relative index of cement under alkali activation and high temperature curing
表 1 基准水泥和锂渣化学成分
Table 1. Chemical composition of cement and lithium slag
% 样品名称 Loss SiO2 Al2O3 Fe2O3 CaO MgO SO3 Na2Oeq 基准水泥 2.18 25.10 6.38 4.19 54.87 2.61 2.66 0.56 锂渣 7.01 58.54 19.34 1.44 7.34 0.73 6.28 0.43 注：Na2Oeq=Na2O+0.658K2O 
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表 2 锂渣复合水泥基材料配合比
Table 2. Mix proportion of lithium slag composite binder
试样编号 水胶比 锂渣复合水泥基材料的组成/% 基准水泥 锂渣 LB0 100 0 LB1 0.40 80 20 LB2 60 40 LB3 40 60 LD0 100 0 LD1 0.30 80 20 LD2 60 40 LD3 40 60 注：标准养护时编号为LB0~LB3和LD0~LD3；高温(50 ℃和100 ℃)养护时，在LB1~LB3和LD1~LD3后加上“5”和“10”；碱激发时，在LB1~LB3和LD1~LD3后加上“p”；复合激发时，在LB1~LB3和LD1~LD3后加上“5p”。下同。
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