Beyea S D, Balcom B J, Bremner T W, Prado P J, Cross A R, Armstrong R L, Grattan-Bellew P E
MRI Centre, Department of Physics, University of New Brunswick, Fredericton, Canada.
Solid State Nucl Magn Reson. 1998 Nov;13(1-2):93-100. doi: 10.1016/s0926-2040(98)00080-0.
The removal of water from pores in hardened cement paste smaller than 50 nm results in cracking of the cement matrix due to the tensile stresses induced by drying shrinkage. Cracks in the matrix fundamentally alter the permeability of the material, and therefore directly affect the drying behaviour. Using Single-Point Imaging (SPI), we obtain one-dimensional moisture profiles of hydrated White Portland cement cylinders as a function of drying time. The drying behaviour of White Portland cement, is distinctly different from the drying behaviour of related concrete materials containing aggregates.
从小于50纳米的硬化水泥浆体孔隙中去除水分，会因干燥收缩引起的拉应力导致水泥基体开裂。基体中的裂缝从根本上改变了材料的渗透性，因此直接影响干燥行为。使用单点成像（SPI），我们获得了水化白波特兰水泥圆柱体的一维水分分布随干燥时间的变化情况。白波特兰水泥的干燥行为与含骨料的相关混凝土材料的干燥行为明显不同。
