TRANSACTIONS OF THE JAPANESE SOCIETY OF IRRIGATION, DRAINAGE AND RECLAMATION ENGINEERING, Volume 215, Page 41-48 (2001)
A Study on the Properties of Massive Concrete Specimen with Different Initial Curing Conditions
SATO Shushi*, HATTORI Kunio**COGATA Hidehiko** and TAKADA Ryuichi***
* United Graduate School of Agriculture, Tottori University
** Faculty of Agriculture, Tottori University
*** Matsue National College of Technology
Abstract
@In this research, six massive concrete specimens that had different temperature
history at their early age were made with same mix proportions and size.
The properties of these specimens are evaluated by the pulse velocity method
and the extracted cores.
@As a result, the density of lower layer in massive concrete specimen
becomes bigger than the upper layer according to three reasons, influence
of bleeding, effect of compaction, and the settlement of aggregate due
to the vibrating compaction. The rate of strength development in massive
concrete center part exposed to higher temperature history becomes to be
smaller, and the difference of strength development between surface layer
and center part comes to be larger. Moreover, the compressive strength
of massive concrete specimens exposed to 60 above for long periods becomes
smaller than that exposed 60 below. It is also clarified that the compressive
strength of massive concrete center part decreases particularly as the
temperature rises 60 over for the initial curing period.