矿物掺合料对高性能混凝土长期耐久性能的影响
发布时间：2018-08-10 08:04
【摘要】：通过对矿物掺合料种类及掺量的改变,研究了矿粉、粉煤灰对高性能混凝土长期耐久性能的影响。研究表明,掺合料混凝土360d龄期抗氯离子渗透性能与90d龄期相比,均增强10%以内,可用90d龄期氯离子扩散系数D_(RCM)值表征混凝土长期耐久性能;矿粉的加入会显著增强混凝土早期及后期耐久性能,增强幅度随掺量增加而增大,当掺量为50%时,360d抗氯离子渗透性能增强52%;粉煤灰的加入会迅速降低混凝土结构耐久性,后期耐久性也无明显增强,当粉煤灰掺量达到50%时,其360d龄期的DRCM值高达基准混凝土的5.4倍。
[Abstract]:The effects of mineral powder and fly ash on the long term durability of high performance concrete were studied by changing the kinds and contents of mineral admixtures. The results show that the chloride penetration resistance of admixture concrete at 360 d age is less than 10% higher than that of 90 d age, and the chloride diffusion coefficient D _ (RCM) of 90 d age can be used to characterize the long-term durability of concrete. The early and late durability of concrete can be significantly enhanced by the addition of mineral powder, and the enhancement range increases with the increase of the content of concrete, and the penetration resistance to chloride ion increases by 52when the addition amount is 50, and the durability of concrete structure will be reduced rapidly by adding fly ash. When the fly ash content reached 50%, the DRCM value of the 360d age period was 5.4 times of that of the reference concrete.
【作者单位】： 苏交科集团股份有限公司;南京新派人才服务有限公司;
【分类号】：TU528
本文编号：2175459
[Abstract]:The effects of mineral powder and fly ash on the long term durability of high performance concrete were studied by changing the kinds and contents of mineral admixtures. The results show that the chloride penetration resistance of admixture concrete at 360 d age is less than 10% higher than that of 90 d age, and the chloride diffusion coefficient D _ (RCM) of 90 d age can be used to characterize the long-term durability of concrete. The early and late durability of concrete can be significantly enhanced by the addition of mineral powder, and the enhancement range increases with the increase of the content of concrete, and the penetration resistance to chloride ion increases by 52when the addition amount is 50, and the durability of concrete structure will be reduced rapidly by adding fly ash. When the fly ash content reached 50%, the DRCM value of the 360d age period was 5.4 times of that of the reference concrete.
【作者单位】： 苏交科集团股份有限公司;南京新派人才服务有限公司;
【分类号】：TU528
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