盐冻循环作用下粉煤灰混凝土性能试验研究

设计制作粉煤灰引气混凝土在3.5%NaCl溶液中进行快速冻融循环试验,测试盐冻循环作用后混凝土的冻融损伤层厚度和相对动弹性模量,并进行静弹性模量试验。研究结果表明:在盐冻循环作用早期,混凝土性能劣化严重,随冻融循环持续,其劣化速度降低;混凝土静弹性模量与相对动弹性模量和盐冻损伤层厚度变化趋势一致,均可表征混凝土盐冻损伤程度。

EXPERIMENTAL STUDY OF PERFORMANCE OF FLY ASH FIBER CONCRETE UNDER THE ACTION OF SALT FROST

The fly ash entrained concrete were designed and tested in 3. 5% NaCl solution under rapid freezing and thawing cycles,and then the concrete damaged layer thickness and relative dynamic modulus of elasticity were studied by the ultrasonic testing technology,and so on the static elastic modulus. The results showed that the deterioration speed of concrete performance was faster than later on the early period of salt-frost cycles. With the freeze-thaw cycles ongoing,the deterioration speed was reduced. All the static elasticity modulus,the relative dynamic elastic modulus and the salt-frost damaged layer thinkness have the same trend,which can characterize the modulus and the concrete salt-frost damaged layer thickness.