Enhancement of Hydration Activity and Microstructure Analysis of γ-CS.

This paper investigated the combined effect of chemical activators and nano-SiO on the hydration reaction and the microstructure of γ-CS. The hydration reaction of γ-CS slurry activated with chemical activators (NaHCO, NaOH, KCO, and KOH at 1 mol/L) was enhanced by 1% nano-SiO. The hydrate reaction rate was determined by isothermal calorimetry, and the hydrated samples were characterized by XRD, TGA/DTG, SEM-EDS, and Si MAS/NMR.

The Synergistic Effect of Ester-Ether Copolymerization Thixo-Tropic Superplasticizer and Nano-Clay on the Buildability of 3D Printable Cementitious Materials.

The shape retention ability of materials deposited layer by layer is called buildability, which is an indispensable performance parameter for successful 3D printable cementitious materials (3DPC). This study investigated the synergistic effect of nano-clay (NC) and thixotropic superplasticizer (TP) on the buildability of 3DPC. The rheological parameters and static yield stress are characterized by the rheology testing, the green strength is measured by a self-made pressure tester, and the fluidity is tested by flow table.

Effect of Structural Build-Up on Interlayer Bond Strength of 3D Printed Cement Mortars.

Understanding the relationship between the intrinsic characteristics of materials (such as rheological properties and structural build-up) and printability and controlling intrinsic characteristics of materials through additives to achieve excellent printability is vital in digital concrete additive manufacturing. This paper aims at studying the effects of material's structural build-up on the interlayer bond strength of 3DPC with different time gaps. Structural build-up can indirectly affect the interlayer bond strength by affecting the surface moisture of concrete.