Assessment of the long-term performance of SCC incorporating different mineral admixtures in a magnesium sulphate environment
Assessment of the long-term performance of SCC incorporating different mineral admixtures in a magnesium sulphate environment
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DOI：
10.1016/j.conbuildmat.2015.01.067
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发表时间：
2015-04
影响因子：
7.4
通讯作者：
H. Siad;M. Lachemi;S. K. Bernard;M. Şahmaran;A. Hossain
中科院分区：
文献类型：
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作者：
H. Siad;M. Lachemi;S. K. Bernard;M. Şahmaran;A. Hossain
研究了矿物掺合料类型对硫酸镁环境中自固结混凝土（SCC）性能的影响，研究时间超过4年。三种矿物掺合料（石灰石填料，粉煤灰和天然火山灰）代表了广泛的组合物中使用的研究。12个配方，涵盖三个强度等级（30，50和70 MPa）和四个混凝土混合物进行了研究。质量损失与物理恶化，尺寸和压缩强度的变化，由于硫酸镁的攻击，通过微观结构分析确定。硫、镁、硅、钙和铝元素的硫酸盐分布也通过对样品的分析进行了量化。对混凝土试件的退化层进行了相组合的补充分析。这些试验结果表明，矿物掺合料类型极大地影响了硫酸镁暴露下SCC的耐久性性能。在测试的矿物掺合料中，天然火山灰在硫酸镁环境中表现出更好的长期耐久性。振动混凝土与自密实混凝土之间的相互作用与矿物掺合料的性质有关。
The effects of mineral admixture type on the behaviour of self-consolidating concrete (SCC) in magnesium sulphate environments were investigated over the course of 4 years of exposure. Three mineral admixtures (limestone filler, fly ash and natural pozzolan) representing a wide range of compositions were used in the study. Twelve formulations covering three strength classes (30, 50 and 70 MPa) and four concrete mixtures were studied. Mass loss with physical deterioration, and dimensional and compressive strength changes due to magnesium sulphate attack were determined through microstructural analysis. The sulphate profiles of sulphur, magnesium, silicon, calcium and aluminium elements were also quantified through analyses of the samples. A complementary analysis by phase assemblages was performed on the degraded layers of concrete specimens. These test results indicate that the mineral admixture type greatly affects the durability performance of SCC under magnesium sulphate exposure. Among the tested mineral admixtures, natural pozzolan showed better long-term durability performance in the magnesium sulphate environment. The interaction between vibrated concrete and SCC is related to the nature of the mineral admixtures.