This study investigated the interfacial fracture toughness (IFT) between injected quick-hardening mortar and coarse aggregate to increase the strength of quick-converting track concrete. The effects of different maximum grain size of sand and different additives (two types of polymer, silica fume, ground granulated blast-furnace slag and fly ash) on the IFT were investigated by using three-point fracture toughness tests to suggest an effective method to omit the cleaning process of contaminated aggregates in the quick-converting track concrete. The silica sand with the maximum grain size of 0.5 mm produced higher IFT than that with smaller particle size; consequently, the strength of quick-converting track concrete using silica sand with coarser particle size was 43.3 MPa, while the IFT was 10.10 MPa∙mm^1/2. Silica fume among the various additives produced the highest strength of quick-converting track concrete (51.9 MPa). Furthermore, the effect of abraded fine particles (attached to aggregates) on IFT was evaluated. As the content of abraded fine particles increased from 0.00 to 0.10 wt%, the value of IFT decreased from 10.39 to 9.29 MPa∙mm^1/2. The experimental findings suggest that the use of silica sand with the maximum grain size of 0.5 mm and silica fume enables an efficient quick-converting track method without a thorough cleaning process of contaminated aggregates.

这项研究调查了注入的速凝砂浆和粗骨料之间的界面断裂韧性（IFT），以提高速变轨道混凝土的强度。通过三点断裂韧性试验研究了不同最大砂粒尺寸和不同添加剂（两种类型的聚合物，硅粉，高炉矿渣和粉煤灰粉）对IFT的影响，提出了一种有效的方法。省略了快速转换轨道混凝土中受污染的骨料的清洁过程。最大粒径为0.5毫米的硅砂比较小粒径的硅砂具有更高的IFT。因此，使用粒度较大的硅砂的快速转换轨道混凝土的强度为43.3 MPa，而IFT为10.10 MPa∙mm ^1/2。各种添加剂中的硅粉产生了最高强度的快速转化轨道混凝土（51.9 MPa）。此外，评估了磨损的细颗粒（附着在聚集体上）对IFT的影响。随着磨损微粒的含量从0.00重量％增加到0.10重量％，IFT值从10.39 MPa降低到9.29 MPa∙mm ^1/2。实验结果表明，使用最大粒径为0.5 mm的硅砂和硅粉可实现有效的快速转换轨迹方法，而无需彻底清洁受污染的骨料。