Fresh Properties and Flexural Strength of3DPrinting Concrete Containing GGBSwith Varies in Water-Cement Ratio

Abstract

In the recent years of construction industry,the need of 3D printing technologies startsto booming throughout the global and significant progress has been achieved in the development of large scale of 3D printing industry. The use of 3D printing concrete to produce structural components and buildings is extremely feasible. Freeform of building is allowed in 3Dprintingconcrete without the necessity of high cost of formwork, which has big advantage over traditional method of pouring concrete into formwork. The aim to conduct this study is to investigate thefresh propertiesflexural strength of 3D printing concrete containingGround Granulated Blast FurnaceSlag (GGBS) with varies in water-cement ratio. The percentage of GGBS that used to replace the Portland cement in this study is fixed at 30% because GGBS has various benefit compare to traditional cement. The main goal of this experiment is to determine the amount of water required for cement contained with GGBS as partial cement replacement which will benefit to the largescale of 3D printing technology. The water-cement ratio varied from 0.4-0.6 with 0.05 increment. The fresh properties investigated included buildability, extrudability and flowability. The findings of this study shown that the fresh properties of the mixture increased with the increment of water-cement ratio while the hardened properties, flexural strength decreased with the increment of water-cement ratio.