回收的废 PET 瓶纤维对含有碎玻璃砂的土工聚合物混合物机械性能的影响

Dulat Ualiyev, Anel Galymzhankyzy, Islambek Manap, Zhaniya Omarova, Doszhan Temirbekov, Aizhan Tukaziban, Zhanbolat Artyk, Chang Seon Shon, D. Zhang
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摘要

本研究重点评估了由 ASTM F 级粉煤灰 (FFA)、磨碎的粒化高炉矿渣 (GGBFS)、从回收的废宠物瓶中获得的塑料纤维以及从生活垃圾中粉碎的废玻璃瓶砂 (WGS) 制成的土工聚合物混合物。共设计了 9 种混合物:其中 3 种混合物含有长纤维(占骨料重量的 5%)且不含 WGS;3 种混合物含有较短的非扭曲纤维(占骨料重量的 2%)且含有 WGS;3 种混合物含有较短的扭曲纤维(占骨料重量的 2%)且含有 WGS。所有土工聚合物混合物都含有 GGBFS、FFA、WGS、塑料纤维和 10 M 碱活性溶液。在 7、14 和 28 天时对土工聚合物混合物的机械性能进行了评估。测试结果表明,PET 纤维增强型土工聚合物混合物的抗压强度低于非增强型混合物。增加 PET 纤维的长度和延长空气固化时间也会降低抗压强度。增加 WGS 含量通常会降低抗压强度,但与参考混合物相比,15% 的替代率会提高抗压强度。在土工聚合物混合物中添加 PET 纤维可显著提高抗折强度,因为它具有更好的抗裂性和良好的应变硬化效果。无捻纤维混凝土的抗折强度明显高于有捻纤维混凝土,而纤维的长度没有影响。纤维的引入并没有提高极限抗拉强度。然而,应变系数却大幅提高。就抗拉强度而言,无捻纤维土工聚合物混合物的性能优于有捻纤维的混合物。含 30% WGS 的土工聚合物混合物的抗拉强度最高。
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Effect of Recycled Waste PET Bottle Fibers on Mechanical Properties of Geopolymer Mixtures Containing Crushed Waste Glass Sands
This research focused on evaluating geopolymer mixture made of ASTM class F fly ash (FFA), ground granulated blast furnace slag (GGBFS), plastic fibers obtained from recycled waste pet bottles, and crushed waste glass bottle sand (WGS) from household waste. A total of 9 mixtures were designed: 3 mixtures with long fibers (5% of aggregate weight) and without WGS, 3 mixtures with shorter non-twisted fibers (2% of aggregate weight) and WGS, and 3 mixtures with shorter twisted fibers (2% of aggregate weight) and WGS. All geopolymer mixtures contained GGBFS, FFA, WGS, plastic fibers, and 10 M of alkali-activated solution. Mechanical properties of geopolymer mixtures were evaluated at 7, 14, and 28 days. Test results indicated that PET fiber-reinforced geopolymer mixtures have lower compressive strength than non-reinforced ones. The increased length of PET fiber and extended air-curing time also decrease compressive strength. Increasing WGS content generally tends to decrease the compressive strength, but 15% replacement shows improvement compared to the reference mixture. Adding PET fibers to the geopolymer mixtures significantly increases flexural strength due to better crack resistance and good strain-hardening effect. Non-twisted fibers concrete’s flexural strength was noticeably higher than that of twisted one, while the length of fibers did not have an impact. The introduction of fibers does not increase ultimate tensile strength. However, the strain coefficient was substantially increased. Non-twisted fibers geopolymer mixtures performed better than twisted ones in terms of tension resistance. The geopolymer mixture with 30% WGS showed the highest results.
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