Hydration properties of the alite-ye'elimite cement clinker synthesized by reformation

摘要

An expansive high early strength alite-ye'elimite clinker containing 4.8% ye'elimite was synthesised by annealing without addition of mineralizer into the raw meal. The reformation of ye'elimite was achieved by C(3)A reacting with C$ in clinker. The microstructure of the paste was characterised by SEM, MIP and N-2 adsorption/desorption. DSC-TG and XRD were used to investigate the hydration products of the paste. Mortar tests on the clinker yielded values of 30.0 MPa, 42.3 MPa and 55.8 MPa at 1,3 and 28 days, respectively. Due to the presence of AFt in the hydrated paste, the expansive behaviour resulted in a reduction in the total pore volume by 29-62% (0.01-10 mu m), but there were more mesopores (2-50 nm) due to the crystalisation of AFt. The linear expansion converged after similar to 150 days with maximum expansion of 0.136%. (C) 2015 Elsevier Ltd. All rights reserved.