CAJ | 학술논문

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%.
탐색채용철미광분취대분매회작위광물참합료제비고연성섬유증강수니기복합재료( ECC)적가행성,중점연구철미광분참량대ECC적랍신특성화항압강도적영향,병비교소연발적신형철미광분ECC여전통분매회ECC적굉관역학성능.연구발현,채용철미광분작위광물참합료제비고연성섬유증강수니기복합재료시가행적. 재동등광물참합료참량하,철미광분ECC적강도성능저우분매회ECC,단표현출경강적랍신연성. 재소연제적철미광분ECC중,당철미광분여수니질량비위1. 2~2. 2시,ECC적28 d항압강도위36. 7~54. 2 MPa,만족일반혼응토결구대항압강도적요구. 차시,ECC적28 d겁한랍신응변위3. 4% ~4. 3%,철미광적총용량점고체기체원재료총질량적66. 6% ~77. 0%.
The substitution of iron ore tailing powders ( IP) for fly ash as mineral admixtures was studied in the development of engineered cementitious composites ( ECC) . The focus was placed on the effect of IP content on the tensile properties and compressive strength of ECC. The mechanical properties of ECC with IP were also compared with those of traditional ECC with fly ash. Experimen-tal results show that it is feasible to use IP as mineral admixtures to produce high-ductile ECC. ECC with IP exhibits a lower strength performance but a higher ductility under tensile load than ECC with fly ash at the same addition of mineral admixtures. ECC with an IP/cement mass ratio of 1. 2-2. 2 shows a 28-d compressive strength of 36. 7-54. 2 MPa, which meets the compressive strength re-quirement of normal concrete structures,and a 28-d tensile ductility of 3. 4% -4. 3%. The amount of iron ore tailings in those mix-tures accounts for 66. 6% -77. 0% of the total solid matrix ingredients of ECC.