Abstract This research evaluates the shear strength properties of unreinforced and geogrid-reinforced ladle furnace slag (LFS), electric arc furnace slag (EAFS) and a blend comprising 50% LFS and 50% EAFS (LFS50+EAFS50) using the large direct shear testing apparatus (DST). The large DST results of unreinforced steel slags indicated that LFS had the lowest shear stress ratio at the peak shear strength among all samples, while LFS50+EAFS50 samples (both unreinforced and reinforced) demonstrated the highest shear stress ratio amongst the tested samples. A higher apparent cohesion value was achieved with the inclusion of biaxial geogrid in LFS and EAFS samples as compared to the triaxial geogrid interface. The observed behavior can be attributed to the larger aperture size of the biaxial geogrid compared to the triaxial geogrid leaving more void planar space for a direct interaction between slag particles. In contrast, the apparent cohesion of LFS50+EAFS50 without a geogrid interface was high and did not change significantly with the insertion of geogrid. Given, the range of internal friction angles for ordinary soils, studied slag by-products achieved internal friction angles in excess of 59° (with no geogrid interface) and these significant values proved highly beneficial application for these waste materials in pavement construction.

中文翻译：

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土工格栅增强钢渣界面剪切强度性能的大型直剪试验装置

摘要 本研究使用大型直剪试验评估了未增强和土工格栅增强的钢包炉渣 (LFS)、电弧炉渣 (EAFS) 和包含 50% LFS 和 50% EAFS 的混合物 (LFS50+EAFS50) 的剪切强度特性。设备 (DST)。未增强钢渣的大 DST 结果表明，LFS 在所有样品中在峰值剪切强度处的剪切应力比最低，而 LFS50+EAFS50 样品（未增强和增强）在测试样品中表现出最高的剪切应力比。与三轴土工格栅界面相比，在 LFS 和 EAFS 样品中加入双轴土工格栅可实现更高的表观内聚力值。观察到的行为可归因于与三轴土工格栅相比，双轴土工格栅具有更大的孔径尺寸，从而为炉渣颗粒之间的直接相互作用留下了更多的空隙平面空间。相比之下，没有土工格栅界面的 LFS50+EAFS50 的表观内聚力很高，并且随着土工格栅的插入没有显着变化。鉴于普通土壤的内摩擦角范围，研究的矿渣副产品实现了超过 59° 的内摩擦角（没有土工格栅界面），这些重要的值证明这些废料在路面施工中的应用非常有益。