Experimental Test on Drying Shrinkage of 3D-printed Fiber-reinforced Concrete at Early Ages

Drying shrinkage due to capillary tension in porous pores has been proven to affect the structural behaviour of concrete. Thus, this paper focuses on the drying shrinkage of 3D-printed fiber-reinforced concrete (3D-printed FRC). The specimens consisted of two groups fabricated by 3D printer for characterization and with a minimal friction of steel fibers in the concrete. One group was used for the compression strength test. The other group was used for drying shrinkage tests in a curing chamber with constant conditions over 60 days. The comparison of expected results and FIB model concrete 2010 suggest that porous structure effects of 3D-printed fiber-reinforced concrete (3D-printed FRC) should be considered. Thus, optimizing cement concrete matrix is necessary in proposing coefficients in moisture diffusion formulations.