2021 Volume 75 Issue 1 Pages 2-9
This paper reports on the evaluation interlayer structural of 1.1nm Tobermorite by the isosteric heat of water adsorption calculated from low-pressure water vapor adsorption isotherms. The results show the relationship between a sharp increase in the adsorbed volume at low pressure （P/P0＝1×10－3） and high regularity of （002） reflection in 1.1nm Tobermorite. This observation means that the adsorption in the range of relative pressure 2×10－4～3×10－3 is occurring for interlayer space of 1.1nm tobermorite, and the dependence was confirmed by the measurements with different adsorption temperatures. These results indicate that a micropore potential is formed inside the 1.1nm interlayer. It also suggests that the rate of increase of the isosteric heat of water adsorption from coverage 0.5～1 was higher associated with the uniformity of adsorption sites inside the interlayer.
