Utilization of Lithium Slag as An Admixture in Blended Cements: Physico-mechanical and Hydration Characteristics
Utilization of Lithium Slag as An Admixture in Blended Cements: Physico-mechanical and Hydration Characteristics
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锂渣作为混合水泥的外加剂的利用：物理机械和水化特性
DOI：
10.1007/s11595-015-1113-x
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发表时间：
2015-02-01
影响因子：
1.6
通讯作者：
Luo Zhongtao
中科院分区：
文献类型：
--
作者：
Tan Hongbo;Li Xiangguo;Luo Zhongtao
采用物理活化、化学活化和物理-化学联合活化3种不同的活化方法，系统研究了锂渣物理力学性能的变化。采用XRD、SEM等手段研究了锂渣复合水泥的胶凝性能和水化过程的机理。结果表明，随着粉磨时间的延长，锂渣复合水泥的比表面积由254增加到700 m2/kg，中值粒径由14.97 μ m减小到8.45 μ m。物理、化学活化和复合活化均能提高锂渣复合水泥的强度和水化程度。与原锂渣相比，随着粉磨时间的延长，砂浆的抗折强度和抗压强度均得到显著提高。掺锂渣的水泥具有较高的强度，掺量为1000的水泥在粉磨时间为10 min时强度最高，28 d抗压强度比普通水泥提高12.3%。当Na 2SO 4含量为0.6%时，抗压强度提高了1.4%，当Al-2（SO 4）中心点18 H（2）O含量为0.4%时，28 d抗压强度提高了5.8%。与后期强度相比，掺加激发剂对水泥早期强度的改善程度更大。XRD和SUM分析结果与力学性能测试结果一致;锂渣复合水泥水化产物主要为AR、Ca（OH）（2）、CaSO 4中心点2 H（2）O和C-S-EI凝胶。
Physical and mechanical properties variations of lithium slag were systematically ins estigated by three different ways such as physical, chemical activation, physical-chemical combined activation. Mechanisms of the cementitious properties and hydration process of lithium slag composite cement were studied by XRD and SEM. The results showed that specific surface area increased ifrom 254 to 700 m(2) kg while median particle size decreased from 14.97 to 8.45 um with the increase of grinding time Physical, chemical activation and combined activation improved the strength and hydration degree of lithium slag composite cement. Compared with original lithium slag, the flexural strength and compressive strength of mortars were improved significantly with the increase of grinding time. A higher strength of the cement with the lithium slag was attained; The sample with 1000 lithium slag got the highest strength when the grinding time was 10 min; the compressive strength was higher than OPC at 28 days, which increased by 12.3%. When the Na2SO4 content was 0.6%, the compressive strength increased by 1.4%; when the Al-2(SO4)center dot 18H(2)O content was 0.4%, the compressive strength increased by 5.8% at 28 days. Compared with the late strength, the improving degree of early strength was larger with the incorporation of activator. The results of XRD and SUM were consistent with the results of mechanical properties; it is also evident that lithium slag composite cement hydration products were mainly AR, Ca(OH)(2), CaSO4 center dot 2H(2)O and C-S-EI gel.