CAJ | 학술논문

以矿渣和粉煤灰为原料,以氢氧化钠和液体硅酸钠为激发剂制备出养护28 d后静态抗压强度高达56.4 MPa的矿渣-粉煤灰基地质聚合物混凝土(geopolymer concrete, GC)试件,以普通硅酸盐水泥为原料制备出养护28 d静态抗压强度高达61.6 MPa的普通硅酸盐水泥混凝土(ordinary Portland cement concrete, PC)试件,采用φ100 mm霍普金森压杆(split Hopkinson pressure bar, SHPB)试验装置分别对GC试件和PC试件进行冲击压缩试验,得到了2种材料在0～100 s~(-1)平均应变率范围内的应力应变曲线.通过分析应力应变曲线,并与PC进行了对比,研究了矿渣-粉煤灰基GC的冲击力学性能.结果表明,GC作为一种新型混凝土类材料,在冲击荷载作用下具有较好的强度、变形性能和韧性;GC是一种率敏感材料,冲击荷载作用下抗压强度、变形性能和韧性随应变率的增大而增强;和PC相比,冲击荷载下GC的抗压强度较小,韧性较低,GC在开始破坏前产生的变形与PC的基本相等,完全破坏时产生的变形较小.
이광사화분매회위원료,이경양화납화액체규산납위격발제제비출양호28 d후정태항압강도고체56.4 MPa적광사-분매회기지질취합물혼응토(geopolymer concrete, GC)시건,이보통규산염수니위원료제비출양호28 d정태항압강도고체61.6 MPa적보통규산염수니혼응토(ordinary Portland cement concrete, PC)시건,채용φ100 mm곽보금삼압간(split Hopkinson pressure bar, SHPB)시험장치분별대GC시건화PC시건진행충격압축시험,득도료2충재료재0～100 s~(-1)평균응변솔범위내적응력응변곡선.통과분석응력응변곡선,병여PC진행료대비,연구료광사-분매회기GC적충격역학성능.결과표명,GC작위일충신형혼응토류재료,재충격하재작용하구유교호적강도、변형성능화인성;GC시일충솔민감재료,충격하재작용하항압강도、변형성능화인성수응변솔적증대이증강;화PC상비,충격하재하GC적항압강도교소,인성교저,GC재개시파배전산생적변형여PC적기본상등,완전파배시산생적변형교소.
The slag- and fly ash-based geopolymer concrete (GC) specimens were prepared by sodium silicate and sodium hydroxide alkali-activated slag and fly ash,the ordinary Portland cement concrete (PC) specimens were prepared by Portland cement, the 28-day-static compressive strengths of the GC and PC were 56.4 and 61.6 MPa, respectively. Impact compressive experiments were carried out on the GC and PC specimens, respectively, by using a 100-mm-diameter split Hopkinson pressure bar (SHPB) device.The dynamic stress-strain curves in the average strain rate range of 0 to 100 s~(-1) for these two materials were obtained experimentally.These stress-strain curves were compared to explore the dynamic mechanics properties of the GC.The GC takes on favorable impact compressive strength,deformation performance and toughness under impact load.The GC exhibits rate sensitivity, its dynamic compressive strength, deformation performance and toughness increases with the increase of strain rate under impact load.The impact compressive strength and toughness of the GC are less than those of the PC, the deformation of the GC before the specimens start breaking is approximate to that of the PC, while the deformation of the GC after the specimens break completely is less than that of the PC.