引用本文摘 ? 要：以非穩態氯離子遷移系數（D值）為指標，研究了復摻粉煤灰和礦粉的混凝土抗氯離子滲透性能及其時變規律。結果表明：降低水膠比，延長齡期（180 d以內）都能使混凝土的抗氯離子滲透性能增強；一定范圍內，抗氯離子滲透性能均隨礦粉摻量的增加而增加，隨粉煤灰摻量的增加而降低，當礦粉摻量分別為37.5%、31.9%時，C30、C45混凝土的抗氯離子滲透性能最佳；隨著齡期延長，C30、C45混凝土的D值差距增大；C30、C45混凝土在90 d、180 d的D值與粉煤灰、礦粉摻量之間的定量關系可用線性公式來表達；C30、C45混凝土的D值與齡期之間的定量關系可用基于Fick第二定律的冪函數表達，其中，指數a與粉煤灰摻量的關系可用高次多項式來表達。 Abstract: The resistance to chloride ion penetration and its time-dependent law of the concrete mixed with fly ash and slag powder were studied with the non-steady state chloride ion migration coefficient(D value) as index. The results show that the resistance to chloride ion penetration of concrete can be enhanced by reducing the water-binder ratio and extending the age (within 180 d). The resistance to chloride ion penetration increases with the increase of slag powder content and decreases with the increase of fly ash content. In certain extent, when the ratio of slag powder content to the total cementitious material reaches 37.5% and 31.9%, the resistance to chloride ion penetration of C30 and C45 concrete reaches the best. With the increase of age, the difference in D values of C30, C45 concrete will increase. Quantitative relationship between the D values of C30, C45 concrete at 90 d, 180 d age and the proportion of fly ash, slag powder in the total mass of the cementitious materials can be expressed by a linear formula. Quantitative relationship between the D values of C30 and C45 concrete and the age can be expressed by a power function based on the Fick’s second law. Relationship between the exponent a of the power function and the proportion of fly ash in the total mass of the cementitious materials can be expressed by a high-order polynomial.
王藝霖,王順堯,劉巧玲,等.礦物摻合料混凝土抗氯離子滲透性能及時變規律[J].混凝土與水泥制品,2021(5):1-5. WANG Y L,WANG S Y,LIU Q L,et al.Study on the Anti-chloride Ion Penetration Performance and Time-dependent Law of Mineral Admixture Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTES,2021(5):1-5.