Villca Ariel Rey, Soriano Lourdes, Borrachero María Victoria, Payá Jordi, Monzó José María, Tashima Mauro Mitsuuchi
Institute of Concrete Science and Technology (ICITECH), Universitat Politècnica de València, 46022 Valencia, Spain.
Materials (Basel). 2022 Apr 8;15(8):2736. doi: 10.3390/ma15082736.
This work studies the possibility of using geopolymer materials to enhance the mechanical and durability properties of hydrated lime-pozzolan mixtures, which gave rise to the so-called "hybrid systems". Two different waste types were used as pozzolan in the lime-pozzolan system: rice husk ash (RHA) and spent fluid catalytic cracking (FCC). The geopolymer fabricated with FCC was activated with commercial reagents (NaOH and NaSiO), and also with alternative sources of silica to obtain a lower carbon footprint in these mixtures. The alternative silica sources were RHA and residual diatomaceous earth (RDE) from the beer industry. The geopolymer mixture substituted the lime-pozzolan mixture for 30% replacement in weight. The hybrid systems showed better mechanical strengths for the short and medium curing ages in relation to the lime-pozzolan mixtures. Thermogravimetric analyses were performed to characterise the types of products formed in these mixtures. In the durability studies, hybrid systems better performed in freeze-thaw cycles and obtained lower capillarity water absorption values.
本研究探讨了使用地质聚合物材料增强熟石灰-火山灰混合物的力学性能和耐久性的可能性，由此产生了所谓的“混合体系”。在石灰-火山灰体系中，使用了两种不同类型的废弃物作为火山灰：稻壳灰（RHA）和废流化催化裂化催化剂（FCC）。用FCC制备的地质聚合物用商业试剂（NaOH和NaSiO）以及替代硅源进行活化，以降低这些混合物的碳足迹。替代硅源为RHA和啤酒工业的残余硅藻土（RDE）。地质聚合物混合物以30%的重量替代率取代了石灰-火山灰混合物。与石灰-火山灰混合物相比，混合体系在短期和中期养护龄期表现出更好的机械强度。进行了热重分析以表征这些混合物中形成的产物类型。在耐久性研究中，混合体系在冻融循环中表现更好，毛细吸水值更低。
