Hromitsu AKAI

Development of the stress meter for early age concrete

Superviser�FTakumi SHIMOMURA

The theory of the stress meter was reconfirmed, then the theory was examined by the experiment concerning the rigidity and friction of the stress meter�fs case.
Theoretical study on the stress meter, that accuracy of measurement in early age has been enhanced if rigidity and friction of the stress meter�fs case were lowered.
Then the new stress mater�fs case to use the polyethylene form of a low rigidity and the Teflon seat of the low friction so that accuracy may improve, as it is a theory is made. And, the new stress meter that combined this new case stress mater�fs case with weight saving load cell was made for trial purposes.
For comparing the new stress mater�fs case and stress mater�fs case, comparing test and comparing test�fs recurrence analysis by finite element method (FEM) were done.
As a result of comparing tests and FEM method, the accuracy enhancement of the new stress meter was confirmed.