In this paper, internal thermal stresses of the cementitious matrix were evaluated by incorporating polypropylene fibers. By using the temperature heating method specified in KS F 2257-1, the temperatures by a depth were measured. Thermal stress was calculated based on Kodur's thermal stress formula. Different thermal stress behaviors were observed depending on amount of PP fiber. Thas, it will become fundamental data to analyze the thermal stresses behavior of structure members subjected to higher temperature.

This study presents the results of experimental research to investigate the drying shrinkage properties of mortar containing the fly-ash and glycol-ether shrinkage reducing agent. the drying shrinkage of mortar was measured according to KS F 2424. It was confirmed from test results that 10% fly-ash replacement and 1% shrinkage reducing agent is most effective to decrease the shrinkage of mortar

This study presents the results of experimental research to investigate the drying shrinkage properties of mortar containing the fly-ash and glycol-ether shrinkage reducing agent. the drying shrinkage of mortar was measured according to KS F 2424. It was confirmed from test results that 10% fly-ash replacement and 1% shrinkage reducing agent is most effective to decrease the shrinkage of mortar.

This research investigated the effects of matrix strength on the direct tensile behavior of high performance hybrid fiber reinforced cementitious composites (HPHFRCCs) at high strain rates. 3 different type matrixes were used (56 MPa, 81 MPa and 180 MPa). And macro fiber was long hooked fiber (H, =0.3 mm,=30 mm) and micro fiber was short smooth fiber (S, =0.2 mm,  =13 mm). The volume content of macro fibers was 1.0% and the volume content of micro fibers was 1.0%. The high matrix strength clearly increased the tensile strength and peak toughness of HPHFRCCs even at high strain rates (74 ~ 161 /sec).