Development of Rapid-Setting Repair Materials Through One-Part Geopolymer Technology

The development of geopolymer materials has been over 35 years. Compared with ordinary portland cement (OPC), geopolymer materials have many excellent properties such as high-early strength, nice durability, low carbon emission…etc. Therefore, geopolymer materials have great potential to replace OPC. In particular, geopolymer’s high early strength characteristics are very suitable as repair materials. However, the traditional geopolymer manufacturing process is mixed alkaline solution and aluminosilicate materials. The transportation and storage of alkaline solution will cause a significant burden on the factory, limiting the application and market willingness of geopolymer material. This study focuses on using solid-state activator to develop one-part geopolymer, which is “only adding water” to produce geopolymer. This study will try to develop [Rapid-setting repair geopolymer paste] and [Rapid-setting repair geopolymer mortar] and discuss the effect of solid activator dosage amount, type of solid activator, and solid activator fineness on the mechanical and workability properties of geopolymer materials. According to the experiment results, after curing for 2h, the compressive strength of [Rapid-setting repair geopolymer paste] can reach over 30 MPa, and the compressive strength can reach 100 Mpa after curing for 28 days. The compressive and flexural strength of [Rapid-setting repair geopolymer mortar] can reach over 60 and 10MPa, after curing for the day. The shrinkage rate can be controlled at lower than 0.1%. This study succeeded in developing a suitable repair material using one-part geopolymer technology. It is hoped that the practical application can be carried out after more testing in the future.