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Assessment of geopolymer composites durability at one year age
Journal of Building Engineering ( IF 6.4 ) Pub Date : 2020-05-15 , DOI: 10.1016/j.jobe.2020.101453
Yurdakul Aygörmez , Orhan Canpolat , Mukhallad M. Al-mashhadani

Geopolymers are important alternative materials for use in support of recycling and sustainability, and one of the most important properties is durability. While many studies perform durability tests 28 days after production, we carried out durability tests on a mixture of geopolymers starting 365 days after production. In this case, other conditions that occur until durability conditions are applied are taken into consideration. The geopolymer mixture consisted of metakaolin (90% by wt.) and boron waste colemanite (10% by wt.). The study investigated heat and wet-dry curing methods and polyolefin and polyamide fibre ratios (0.5, 1.0, and 1.5% by vol.) on durability. Durability issues related to concrete, such as long-term exposure to hydrochloric acid, freeze-thaw cycles, and abrasion were recorded. Results show that polyamide fibres provide better results than polyolefin fibres, the optimum polyamide fibre ratio was 1%, and the wet-dry curing method increased geopolymerisation more than heat curing. The Si-O-Al bonds were found to be stronger after wet-dry curing. All durability studies showed that the compact structure of the geopolymers withstood the durability tests performed one year after production. Scanning electron microscopy (SEM) analysis supports these results.



中文翻译:

评估一岁土工复合材料的耐久性

地质聚合物是重要的替代材料,可用于支持回收利用和可持续发展,而最重要的特性之一就是耐久性。尽管许多研究在生产后28天进行了耐久性测试,但从生产后365天开始,我们对多种地质聚合物混合物进行了耐久性测试。在这种情况下,考虑了直到施加耐久性条件之前发生的其他条件。地聚合物混合物由偏高岭土(90%(重量))和硼废钴锰矿(10%(重量))组成。该研究研究了热固化和干湿固化方法以及聚烯烃和聚酰胺纤维的耐久性比(0.5、1.0和1.5%(按体积计))。记录了与混凝土有关的耐久性问题,例如长期暴露于盐酸,冻融循环和磨损。结果表明,聚酰胺纤维比聚烯烃纤维提供更好的结果,最佳聚酰胺纤维比率为1%,并且湿-干固化方法比热固化更能增加地聚。发现干湿固化后,Si-O-Al键更牢固。所有耐久性研究表明,地质聚合物的紧凑结构经受了生产后一年的耐久性测试。扫描电子显微镜(SEM)分析支持这些结果。

更新日期:2020-05-15
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