Geopolymers are highly durable and have favorable mechanical properties, and are thus regarded as an eco-friendly alternative to traditional ordinary Portland cement binder. In this study, MWCNTs are obtained through a modification method using a compound of nitric acid and sulfuric acid, and are then dispersed using three types of dispersants. Fly ash-based geopolymers are prepared to validate the effectiveness and feasibility of adopting 0.05 wt.%, 0.10 wt.%, and 0.15 wt.% functionalized MWCNTs and substitution ratios of 10 %–40 % of fly ash with GBFS. The structure and dispersity of the functionalized MWCNTs in aqueous solutions are characterized using FT-IR and TEM, respectively. Then, the setting time, water absorption capacity, and mechanical behaviors are evaluated. In addition, SEM-EDS, FT-IR, TG-DSC, ²⁹Si NMR, and XRD are employed to investigate the morphology, elemental components, mineralogical phases, and geopolymerization degree of the gel products. The experimental results show that the functionalized MWCNTs comprise −COOH and −OH groups and can be uniformly dispersed in aqueous solution containing SDS dispersant. Furthermore, geopolymer paste incorporated with 0.1 wt.% functionalized MWCNTs and having 30 % substitution of fly ash with GBFS exhibits a higher compressive and flexural strength and a lower water absorption capacity compared with all other geopolymer pastes.

地质聚合物具有很高的耐久性，并具有良好的机械性能，因此被认为是传统普通波特兰水泥粘合剂的环保替代品。在这项研究中，通过使用硝酸和硫酸的化合物通过改性方法获得MWCNT，然后使用三种类型的分散剂对其进行分散。制备了基于粉煤灰的地聚合物，以验证采用0.05 wt。％，0.10 wt。％和0.15 wt。％的功能化MWCNT以及使用GBFS替代10％至40％的粉煤灰的有效性和可行性。分别使用FT-IR和TEM表征了官能化MWCNT在水溶液中的结构和分散性。然后，评估凝固时间，吸水能力和机械性能。此外，SEM-EDS，FT-IR，TG-DSC，²⁹Si NMR和XRD用于研究凝胶产物的形貌，元素组成，矿物相和地质聚合度。实验结果表明，官能化的MWCNT包含-COOH和-OH基团，并且可以均匀地分散在含有SDS分散剂的水溶液中。此外，与所有其他地质聚合物糊料相比，掺有0.1 wt。％官能化MWCNT并具有30％的粉煤灰被GBFS取代的地质聚合物糊料显示出更高的压缩强度和弯曲强度以及更低的吸水能力。