Evaluation of Deterioration and Strengthening with a Permeability-type Agent for an Aged Terra-cotta by Using a New Type of Surface Strength Measurement Apparatus

Abstract

Deterioration of outer of an aged building built in 1932 covered with terra-cotta has been checked by a new type of surface strength measurement apparatus which has been developed br the authors.Effectiveness of various repairing has been also discussed,based on the penetration speed of drilling tip of the apparatus.Followings have been found in the present experiment.1)Cause of deterioration of the terra-cotta can be discussed based on the penetration speed obtained by using the apparatus.2)Effectiveness of permeability-type agents on the strengthening of surface of the terra-cotta can be confirmed and discussed on test data from the apparetus.3)The permeability-type strengthening agent proposed in the present experiment mat permeate terra-cotta material by about 9mm.