Experimental Study on the Bleeding Method on Chemical Shrinkage of Portland Cement Paste

概要

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It is known that absolute volume of solids (volume of unhydrated cement and hydrates) increases, but the initial volume of cement paste (volume of unhydrated cement and water) decreases with progressing hydration of cement paste. This decreased volume is called as chemical shrinkage, and can be observed as change in height of the top surface of bleeding water at bleeding test, unless the vacuum or air void space is created in the hardened cement structure. The phenomena of this shrinkage is different completely from the autogenous shrinkage of cement paste due to self desication. There are three kinds of measuring methods for chemical shrinkage by : measurement of change in bleeding water (bleeding method), Le Chatelier's method and measurement of change in length. In this study, influences of water-cement ratio, placed height of paste, amount of added water and type of added water on chemical shrinkage of cement paste measured by bleeding method were experimentally investigated. The amount of chemical shrinkage was decreased with increase in placed height of paste and with increase in ionic concentration in added water.
東海大学の論文