Initial properties of 3D printing concrete using Rice Husk Ash (RHA) as Partial Cement Replacement

Abstract

3D printing concrete is an alternative technology for construction industry that are gaining interest among the developers and contractors worldwide. 3D printing concrete requires a good quality printing material that are buildable, strong and durable to be used as construction material. This present study uses Rice Husk Ash (RHA) as cement material replacement in in 3D printing concrete. Initial investigation was carried out to assess the suitability of RHA as cement replacement by conducting basic cement test such as cement consistency, setting time and workability of the mortar. The amount of RHA was constant at 20% used as cement replacement. From this study, the appropriate water-binder ratio of RHA cement replacement was 0.45:1. As for setting time, the time required for mortar mix to be transport and delivered through the nozzles for 3D printing was achieved by implemented the 20% RHA as cement replacement which are initial time at 155 minutes and final time at 312 minutes. The flowability of the mortar with RHA were found to be printable and achieve the requirements of mortar for 3D printing. Hence, RHA exhibits promising material to be used as cement replacement in 3D printing construction.