Topic
Geopolymer
About: Geopolymer is a research topic. Over the lifetime, 6776 publications have been published within this topic receiving 157991 citations. The topic is also known as: geopolymers.
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TL;DR: In this article, the simultaneous effect of nano-silica and steel fiber on the fresh and hardened state performance of self-compacting geopolymer concretes (SCGC) was investigated.
131 citations
TL;DR: In this paper, 90-W microwave radiation for 5min plus a shortened heat curing period was applied to cure the fresh geopolymer paste, which resulted in a dense composite and strong bonding between the fly ash and the geopolymers matrix leading to high strength gain compared to those of the control pastes cured at 65°C for 24h.
Abstract: In this paper, 90-W microwave radiation for 5 min plus a shortened heat curing period was applied to cure the fresh geopolymer paste. Results showed that microwave radiation contributed to the dissolution of fly ash in the alkaline solution. Numerous gel formations were observed in microscopic scale. This resulted in a dense composite and strong bonding between the fly ash and the geopolymer matrix leading to high strength gain compared to those of the control pastes cured at 65 °C for 24 h. In addition, resistances to the sulfuric acid and sulfate attacks of the microwave geopolymer were superior to that of the control as indicated by the relatively low strength loss. The microwave radiation also helped the geopolymer attaining thermal stability as the dense matrices were obtained.
130 citations
TL;DR: In this paper, the compressive strength and permeation properties of fly ash-based geopolymer concrete were investigated and the results indicated that compressive strong increased with the increase in OPC content at all ages, with optimum being at 20%.
130 citations
TL;DR: In this paper, the strength development of RAP-FA geopolymer as a road construction material was investigated via Scanning Electron Microscopy (SEM), and X-ray Diffraction (XRD) analyses.
130 citations
TL;DR: In this paper, fly ash-based geopolymers were synthesized by using fly ash as the main starting material, zeolite or bentonite as supplementary materials, and NaOH and CaO together as activator.
Abstract: Geopolymers were synthesized by using fly ash as the main starting material, zeolite or bentonite as supplementary materials, and NaOH and CaO together as activator. An orthogonal array testing protocol was used to analyze the influence of the mix proportion on the properties of the geopolymers. The results indicate that the concentration of NaOH solution and the CaO content play an important role on the strength of the materials. Especially, with zeolite as additive, the fly ash-based geopolymer shows the highest strength and the best sulfate resistance. Infrared spectroscopy, X-ray, and SEM–EDX demonstrate that supplementary zeolite may involve the process of geopolymerization to form a stable zeolitic structure and improve the properties of the geopolymer. Bentonite simply acts as a filler to make the geopolymer more compact, but shows no improvement on the compositions and the microstructures of the geopolymer.
130 citations