Surface Modification of Autoclaved Light Weight Concrete

Surface properties of commercial autoclaved light weight concrete (ALC) having 1.1nm-tobermorite as a major constitutional mineral were investigated. The effective field strength of the ALC surface was determined as 6.6×105e.s.u./cm2 from the slope of linear relation between heat of immersion (hi (sl)) and dipole moment of immersing media. And the relation of (hi (sl)) for water with evacuation temperature of the ALC was quite close to that of α-quartz indicating the maximum of (hi (sl)) near 300°C. Effective methods of surface modification for water repellent were found by either autoclaving at 234°C under 3.0MPa or reflux-boiling at 75°C under 101kPa, using solution of 1-hexadecanol diluted with hexane in each method.