The study was an attempt to elucidate the compressive strength of oyster shell (OS) aggregate and ground granulated blast furnace slag mortar in different curing condition and to know their amount of solar reflectance, brightness and heat absorption characteristic of the pavements surface which was prepared with study mortar by top filling on open graded asphalt concrete. The compressive strength cylindrical samples were cured in 10℃, 20℃ and 30℃. Light irradiation test conducted in natural condition in 3 consecutive days also in environmentally controlled room, 3 hours light irradiation was applied on 7 types of sample pavements surface. The amount of solar reflection was measured by spectrometric analysis with the wavelength of 380-2,600 nm. At 28 days age, 30℃ water curing samples showed the highest strength for river sand mortar samples, and 20℃ water curing showed the highest compressive strength for OS mortar samples except high early strength Portland cement (HSPC)-OS mortar. Highest compressive strength of HSPC-OS mortar was for 20℃ air curing sample. In brightness, light irradiation test and spectrometric analysis showed that ordinary Portland cement (OPC)-Slag-OS sample is the brightest and highest solar reflector as well as it showed lowest surface temperature within the study pavements.
In this study, we investigates the relationship between the degree of degradation of biodegradable resin mortar and exposure conditions in order to use the mortar for temporary materials such as piles and sheet piles. The differences in exposure conditions had a strong correlation with the degree of degradation in the specimens and the rate of mass change, and the surface degradation and the mass changing were caused by microbial biomass. However, the effect of the exposure conditions on strength reduction was small because microbial degradation was very low. Therefore the degradation mechanism of the initial exposure was due to the reduction in bond strength between the biodegradable resin and aggregates by water, and the surface degradation and gradual strength reduction after two months of exposure was due to microbial degradation.