摘要
本文研究了以偏高岭土为铝硅酸盐前驱体原料,以工业级水玻璃作为碱激发剂,使用不同掺量的聚乙二醇4000(PEG-4000)作为添加剂,以理论摩尔配比(SiO_2/Na_2O=1.3,Na_2O/Al_2O_3=0.8, SiO_2/Al_2O_3=2.96,H_2O/Na_2O=18)为基准配比,经机械搅拌后得到地质聚合物浆料,注浆在20 mm×20 mm×20 mm的立方试块模具中,在60℃恒温恒湿箱中养护24 h后脱模得到立方形的地质聚合物复合材料。以复合材料的抗压强度和弹性模量为指标,采用了扫描电镜(SEM)、X射线衍射仪(XRD)、电子万能试验机等测试仪器对样品的各项性能进行了分析。结果表明:不同掺量的PEG-4000能够提高地质聚合物的强度和韧性,地质聚合物的脆性有所改善,随着PEG掺量的增加,地质聚合物复合材料的抗压强度先增加后降低,弹性模量逐渐下降,并且PEG的加入不会影响地质聚合物物相的稳定性。
Geopolymer composite materials were prepared by mixing evenly according to the formula molar ratio （SiO2/Na2O = 1.3, Na2O/Al2O3 = 0.8, SiO2/Al2O3 = 2.96, and H2O/Na2O = 18） with metakaolin and water as raw materials, industrial water glass as alkali activator, and diferent amounts of PEG as additives. After mechanical stirring, the geopolymer slurry was cast in a cube mould with the side length of 20 mm, cured at 60℃ for 24 h and then demoulded. Based on the compressive strength and elastic modulus of the composites as the norms, the samples were analyzed by scanning electron microscopy （SEM）, X - ray difraction （XRD）, and universal electronic testing machine. The results showed that adding diferent amounts of PEG-4000 could improve the strength and toughness of the geopolymer, and the brittleness could also be improved. The compressive strength of the composite materials increased frst and then decreased with the increase of the PEG-4000 amount while the elastic modulus of the composites decreased only. The addition of PEG did not afect the stability of the phase of the geopolymer.
作者
柯誉满
吴怡
徐梦雪
贺艳
崔学民
KE Yuman;WU Yi;XU Mengxue;HE Yan;CUI Xuemin(Guangxi Key Lab of Petrochemical Resource Processing and Process Intensifcation Technology,School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,Guangxi,China)
出处
《陶瓷学报》
CAS
北大核心
2018年第5期574-578,共5页
Journal of Ceramics
基金
国家自然科学基金(21566006和51668009)
广西自然科学基金(2016GXNSFGA380008)
