The objective of this study is to evaluate the shear adhesive strength of embedded tile to the precast concrete panel. Preparing the precast panel for this purpose ,the sixteen examples of panel of which dimensions are from 2010 to 3580mm in width, from 2980 to 5790mm in height from 180 to 235mm in thickness,and when wind load were set,the shear stress(τ)generated in interface of ceramic tile /concrete was obtained. As a result ,the maximum value of τ was 0.31kgf/cm². In case of thin precast panel for example 50-100mm thickness,there will be possible to increase the shear stress being generated.

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This report presents mechanical properties of adhesive which affects the stress distribution on bonded surface of mortar. Compression-shear test were conducted using mortar specimen glued with epoxy resin (lap joint) Adhesive stress is not uniformly transmitted on the bonded surface,the maximum adhesive stress always occur near the end of the bond-line. The stress concentration factor (Fs) was obtained from the measured strain at the end of the bond-line (εmax),and at the center of the bond‐line (εmean) Fs was calculated from the ratio εmax/εmean The test results show that the stress concentration factor depends on the modulus of elasticity Of epoxy resin (Eρ),as follows. Fs=4～ 20 in the case where epoxy resin with 2 000～ 30000kgf/cm² of Eρ are used. Fs=4～ 25 in the case where epoxy resin with 5～ 30kgf/cm² of Eρ are used.

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The quality of stones used as architectural materials is essentially unstable since they are naturally produced. Their design strength is low because the presence of defects such as rifts, cleavage planes and joints requires large safety factors The defects contain voids which decrease their strength This study proposes the filling up of such voids in natural stones with a polymer in order to enhance their strength.Polymer-impregnated stones 〔PIS〕are prepared by polymer impregnation treatment which is done by first evacuating the stones in a closed vessel,filling up the voids with methyl methacrylate〔MMA〕containing a catalyst,and then heating the stones to induce the polymerization of the monomer The stones subjected to polymer impregnation treatment are tuff, sand stone and andesite which allow the easy impregnation of the monomer The use of these soft stones has been limited because of their low strength, abrasion resistance and impact resistance as well as poor decorativeness The results Of this study show that it is possible to improve the physical properties of the soft stones and impart a gloss to their surfaces by polymer impregnation treatment,thus expand their applications in archit ecture.

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