Suitability of Alkali Activated GGBS/Fly Ash Concrete for Chloride Environments
Suitability of Alkali Activated GGBS/Fly Ash Concrete for Chloride Environments
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DOI：
10.14359/51701073
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
D. Bondar;S. Nanukuttan;M. Soutsos;P. Basheer;J. Provis
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文献类型：
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作者：
D. Bondar;S. Nanukuttan;M. Soutsos;P. Basheer;J. Provis
本文研究了不同矿渣/粉煤灰比（80/20、60/40、40/60和20/80）的碱矿渣/粉煤灰（AA-S/F）混凝土中氯离子的侵入。碱性活化剂是氢氧化钠和硅酸钠的混合物，以获得按胶凝材料的重量计6-8%的氢氧化钠（NaOH）浓度。混合物的Si 0-Si 2/Na 2-Si 0比率（二氧化硅模量，Ms）为0.45、1.0和1.25。应用的测试包括典型的新鲜和硬化性能，空气含量，坍落度，抗压强度，体积电阻率和非稳态氯化物迁移。结果表明，虽然可以实现有吸引力的工程性能，氯离子进入AA-S/F混凝土研究这里与> 20%的粉煤灰是中等到高，这可能使他们不适合用于钢筋混凝土中的氯化物环境。
This study investigates chloride ingress into alkali-activated slag/fly ash (AA-S/F) concretes with various ratios of slag to fly ash (80/20, 60/40,40/60 and 20/80). Alkaline activators were a mixture of sodium hydroxide and sodium silicate to obtain between 6-8% sodium hydroxide (NaOH) concentration by weight of cementitious material. The Si0₂/Na₂0 ratios (silica modulus, Ms) of mixtures were 0.45, 1.0 and 1.25. Tests applied included typical fresh and hardened properties, air content, slump, compressive strength, bulk resistivity and non-steady state chloride migration. The results show that while attractive engineering properties can be achieved, the chloride ingress in the AA-S/F concretes studied here with > 20% fly ash is moderate to high and this may make them unsuitable for use in reinforced concrete in chloride environments.