Effect of Mineral Admixtures on Durability of Concrete Structure Subjected to Alkaline Saline Corrosions
Effect of Mineral Admixtures on Durability of Concrete Structure Subjected to Alkaline Saline Corrosions
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DOI：
10.4028/www.scientific.net/kem.302-303.68
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发表时间：
2005-12
期刊：
影响因子：
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通讯作者：
Q. Niu;N. Feng
中科院分区：
文献类型：
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作者：
Q. Niu;N. Feng
分析了碱离子、硫酸根离子和氯离子的组合对混凝土结构耐久性的影响，并研究了不同矿物掺合料对氯离子渗透、硫酸盐侵蚀和碱硅反应引起的劣化的影响。干湿试验表明，在高Cl-浓度溶液中，硫酸盐对混凝土的侵蚀大大减轻，但扩散试验表明，SO4 2- 离子的存在加速了Cl-的扩散，因为SO4 2- 可能先于Cl-离子与铝相结合。用高炉矿渣（SL）和金属岭土（MK）等矿物掺合料代替水泥有利于吸收渗透到浆体中的Cl-离子，而ASTM C441表明，粉煤灰（FA）、偏高岭土和天然沸石（NZ）在控制碱硅反应（ASR）方面表现出有效的效果。
Effect of a combination of alkali ions, sulfate ion and chloride ion on durability of concrete structures was analyzed, and the effect of different mineral admixtures on deterioration caused by Cl- penetration, sulfate attack and alkali-silica reaction was investigated. It is shown from wetting-drying test that sulfate attack on concrete was greatly relieved in high Cl- concentration solution, but diffusion test showed that Cl- diffusion was accelerated by SO4 2- ion existence as SO4 2- may incorporate with aluminum phase prior to Cl- ion. Replacement of cement with mineral admixtures such as ground blast furnace slag (SL) and metalaolin (MK) were beneficial for absorption of Cl- ion penetrated into paste, while ASTM C441 showed that fly ash (FA), metakaolin and natural zeolite (NZ) exhibited effectiveness in controlling Alkali-silica reaction (ASR).