Abstract
Drying shrinkage and mass change of cementitious materials with standard substances for extrusion moulding are dealt with herein, especially focused on the cyclic effect of moisture and dry in constant temperature and humidity. The followings can be noted as the technological remarks for controlling moisture movements of the materials. 1) The features of drying shrinkage on cementitious materials produced by extrusion moulding are represented as residual strain and equilibrium one of drying shrinkage. The more the water content ratio is, the greater two types of strains are. 2) Drying shrinkage strain is able to be predicted on the basis of extruding pressure in factories. 3) Relationships between two types of shrinkage strains and logarithm of cyclic number are clarified to be presented as linear curves.
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