炭素繊維補強モルタルの乾燥の程度と乾燥収縮ひずみの関係

Abstract

Drying shrinkage strains were measured on thin mortar specimens (4×0.4×14cm) with volume fractions, 0%, 1% and 2% of carbon fibers. The experiments comprised two series (Experiment A and B). In Experiment A, measurements of water loss (W) and drying shrinkage strain (S) with drying time were made, respectively at 10% relative humidity. From the test result W-S relationships were obtained. In Experiment B, drying shrinkage strains were measured at equilibrium under various humidities (h). From the result, h-S relationships were obtained. The results can be summarized as follows; (1) The effect of carbon fiber content on drying shrinkage strain of mortar was negligible. (2) The older the age at the start of drying, the larger the drying shrinkage strain. (3) The mathematical expressions of h-S relationship and W-S relationship which the authors previously proposed for hardened cement pastes were satisfactorily applied for mortars.