Effect of Furnace Slag Fiber on Strength and Deformation Characteristics of Cemental Sand
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摘要:
这是一篇矿物陶瓷材料领域的论文。为了增强胶结砂材料的力学性能，同时提高矿产资源利用率，将高炉矿渣纤维与河砂、水泥和水混合后压制成加筋胶结砂试样。通过开展无侧限压缩实验研究了高炉矿渣纤维的掺量和长度对加筋试样强度于变形特性的影响规律。结果表明：随着纤维掺量的增加，胶结砂试样的无侧限强度呈增长趋势，但增长幅度在掺量超过0.3%后明显降低；采用5 mm和10 mm的两种长度纤维进行实验，在相同掺量条件下，长纤维对胶结砂强度的增强效果是短纤维的1.25~1.55倍左右；经过微观形态观察，发现高炉矿渣纤维掺入胶结砂后，提高了颗粒间的黏结程度和团聚效果，进而增强了胶结砂的强度和韧性。
Abstract:This is a paper in the field of mineral ceramic materials. In order to enhance the mechanical properties of cemental sand materials and improve the utilization rate of mineral resources, the reinforced samples were made by mixing blast furnace slag fiber with river sand, cement and water. The effects of the content and length of furnace slag fibers on the strength characteristics of reinforced specimens were studied by unconfined compression tests. The results show that the unconfined strength of cemental sand samples increases with the increase of the content of furnace slag fiber, but the increase rate decreases obviously when the content of fiber reaches 0.3%. Using 5 mm and 10 mm fiber length to modify the cemented sand, the strengthening effect of the long fiber on the strength of the cemented sand is 1.25~1.55 times that of the short fiber under the condition of the same dosage. Through the microscopic morphology observation, it is found that the addition of furnace slag fibers to the cemental sand can improve the degree of adhesion between particles and agglomeration effect, and then enhance the strength and toughness of the cemented sand.
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Key words:
- Slag fiber /
- Ceramics and composite /
- Cemental sand /
- Unconfined compression experiment /
- Strength /
- Microstructure
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表 1 高炉矿渣纤维的化学成分/%
Table 1. Chemical composition of slag fiber
CaO SiO2 Al2O3 MgO K2O Fe2O3 Fe3O4 其他 32.5 40.7 12.2 7.5 1.2 2.0 1.8 2.1 
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表 2 高炉矿渣纤维的基本技术指标
Table 2. Basic technical index of slag fiber
密度/（g·cm-3） 平均直径/μm 抗拉强度/MPa 断裂拉伸率/% 0.65 5.5 55 6.2
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表 3 加筋前后的力学参数及增幅度
Table 3. Mechanical parameters and amplitude increase before and after reinforcement
名称 无侧限抗压强度/kPa 增幅/% 破坏应变/% 增幅/% 加筋试样 1052.8 66.1 2.85 29.1 普通试样 634.2 3.68
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