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探索采用铁尾矿粉取代粉煤灰作为矿物掺合料制备高延性纤维增强水泥基复合材料(ECC)的可行性,重点研究铁尾矿粉掺量对ECC的拉伸特性和抗压强度的影响,并比较所研发的新型铁尾矿粉ECC与传统粉煤灰ECC的宏观力学性能.研究发现,采用铁尾矿粉作为矿物掺合料制备高延性纤维增强水泥基复合材料是可行的.在同等矿物掺合料掺量下,铁尾矿粉ECC的强度性能低于粉煤灰ECC,但表现出更强的拉伸延性.在所研制的铁尾矿粉ECC中,当铁尾矿粉与水泥质量比为1.2~2.2时,ECC的28 d抗压强度为36.7~54.2 MPa,满足一般混凝土结构对抗压强度的要求.此时,ECC的28 d极限拉伸应变为3.4%~4.3%,铁尾矿的总用量占固体基体原材料总质量的66.6%~77.0%.
The feasibility of using iron tailings instead of fly ash as mineral admixture to prepare high ductility fiber reinforced cement-based composites (ECC) was explored, and the tensile properties and compressive strength , And compared the macroscopic mechanical properties of the developed new iron tailings (ECC) with the traditional fly ash ECC.The results show that it is feasible to use the iron tailings as mineral admixture to prepare high ductility fiber reinforced cementitious composites. At the same mineral admixture dosage, the strength performance of the iron tailings ECC is lower than that of the fly ash ECC, but show stronger tensile ductility.In the developed iron tailings powder ECC, when the iron tailings When the mass ratio of powder to cement is 1.2-2.2, the compressive strength of ECC at 28 days is 36.7-54.2 MPa, which meets the compressive strength requirement of common concrete structures. At this moment, the ultimate tensile strain of ECC at 28 days is 3.4% 4.3%, the total amount of iron tailings accounted for 66.6% ~ 77.0% of the total mass of solid matrix raw materials.