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为了探明自密实轻集料混凝土(Self-compacting light-weight aggregate concrete,SCLC)离子侵蚀性能及微观机理,采用溶液浸泡法、RCM法分别测试了SCLC35和SCLC50的离子侵蚀性能和氯离子扩散系数,采用ESEM和显微硬度来测试SCLC界面过渡区的微观结构。结果表明,SCLC浸泡在5% Na_2SO_4和5%NaCl混合溶液中强度为先增大后减小,120d左右达到最大值,和浸泡在清水中相比,浸泡龄期120d时强度低3%,浸泡龄期360d时强度低10%左右;SCLC氯离子扩撒系数随龄期增大逐渐减小,SCLC35为9.387×10~(-13) m~2·s~(-1)~4.254×10~(-13) m~2·s~(-1),SCLC50为8.136×10~(-13) m~2·s~(-1)~2.959×10~(-13) m~2·s~(-1),均能达到混凝土氯离子迁移系数中的很好等级,SCLC35和SCLC50具有良好的抗离子侵蚀性能。SCLC的水化产物更加均匀致密,界面过渡区得到显著改善;SCLC50比SCLC35显微硬度值大10kgf·mm~2以上并且从集料区经过过渡区到浆体区显微硬度值逐渐增大:浆体区>过渡区>集料区,界面薄弱区显微硬度增加,抗离子侵蚀性能得到改善。
In order to investigate the ion erosion performance and microscopic mechanism of Self-compacting light-weight aggregate concrete (SCLC), the ion etching performance and chloride ion diffusion coefficient of SCLC35 and SCLC50 were tested by solution immersion method and RCM method respectively. , The ESEM and microhardness were used to test the microstructure of the transition zone of the SCLC interface. The results showed that the intensity of SCLC immersed in 5% Na2SO4 and 5% NaCl solution first increased then decreased and reached the maximum at 120 days, compared with the immersion in clear water, The intensity of SCLC chloride decreased gradually with the increase of age at 360 days, and the SCLC35 was 9.387 × 10 ~ (-13) m ~ 2 · s ~ (-1) ~ 4.254 × 10 ~ (-13) m ~ 2 · s ~ (-1) and SCLC50 of 8.136 × 10 ~ (-13) m ~ 2 · s -1 ~ 2.959 × 10 ~ (-13) m ~ 2 · s ~ (-1), all can reach a good level in concrete chloride migration coefficient, SCLC35 and SCLC50 have good ion erosion resistance. The hydration products of SCLC are more uniform and compact, and the interfacial transition zone is significantly improved. The microhardness of SCLC50 is larger than that of SCLC35 by more than 10kgf · mm ~ 2 and the microhardness increases gradually from aggregate zone to transition zone to slurry zone: Slurry zone> transition zone> aggregate zone, the interface weakness increases the microhardness, anti-ion erosion performance is improved.