激发剂浓度对偏高岭土基地聚物性能的影响机制

发布时间：2019-06-03 18:18

【摘要】：研究了激发剂、固化温度等外部因素对地聚物力学性能的影响及其机制,以NaOH和Na2SiO_3作为激发剂,通过正交试验考察了偏高岭土基地聚物的力学性能对激发剂模数、激发剂浓度、固化温度和固化时间等影响因素的敏感性。通过微量热、红外光谱和扫描电镜-能谱方法分析了激发剂浓度影响聚合反应过程及地聚物性能的作用机理。试验结果表明:激发剂浓度是影响地聚物力学性能的最关键因素,地聚物抗压强度随激发剂浓度增加而提高;次关键因素是激发剂模数,地聚物强度随激发剂模数增大而降低。随着激发剂浓度增大,聚合反应逐渐充分,地聚物力学性能也随之提高;激发剂浓度为80%时聚合反应趋向完全,地聚物强度提高到99.98 MPa,生成物Si/Al大于1。
[Abstract]:The effects of external factors such as exciter and curing temperature on the mechanical properties of geopolymer and their mechanism were studied. Using NaOH and Na2SiO_3 as activators, the mechanical properties of metakaolin base polymer on the modulus of exciter were investigated by orthogonal test. The sensitivity of factors such as exciter concentration, curing temperature and curing time. The mechanism of the effect of exciter concentration on the polymerization process and the properties of geopolymer was analyzed by means of microthermal spectroscopy, infrared spectroscopy and scanning electron microscope-energy dispersive spectroscopy (EDS). The experimental results show that the concentration of exciter is the most key factor affecting the mechanical properties of geopolymer, and the compressive strength of geopolymer increases with the increase of the concentration of exciter, and the secondary key factor is the modulus of exciter, and the strength of geopolymer decreases with the increase of the modulus of exciter. With the increase of the concentration of exciter, the polymerization reaction is becoming more and more sufficient, and the mechanical properties of ground polymer are also improved. When the concentration of exciter is 80%, the polymerization tends to be complete, and the strength of ground polymer increases to 99.98 MPa, product Si/Al > 1.
【作者单位】：长沙理工大学土木与建筑学院;长沙理工大学桥梁工程安全控制教育部重点实验室;美国路易斯安那州立大学建筑与环境工程系;
【基金】：国家自然科学基金(51578078) 国家“973”计划(2015CB057701) 长沙市科技计划(K1508020-31) 长沙理工大学土木工程优势特色重点学科创新性项目(16ZDXK10)
【分类号】：TU521.3

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