CAJ | 학술논문

研究安防系统对超高性能水泥基复合材料工作性及超高力学性能的特殊要求,以大掺量超细工业废渣取代水泥,掺加超高硬度细集料,采用高温干热养护制度,成功制备出一种超高性能水泥基复合材料.对其工作性及不同养护温度和养护时间下的力学性能进行测试,结果表明,制备的材料具有较好的工作特性及超高力学性能,可满足安保产品要求,其抗压强度最高可达240 MPa.采用X射线衍射技术、差热-热重分析方法及扫描电镜对其微观结构形成进行分析,结果显示,超高硬度细集料与胶凝材料的强物理结合使其在复合材料中起增强相的作用,高温养护加速了水泥的水化及矿物惨合料的火山灰反应,降低了材料中Ca(OH)2的含量,增加了C-S-H凝胶的含量,提高了材料的密实度,改善了界面微观结构,提高了超高性能水泥基复合材料的宏观力学性能.
연구안방계통대초고성능수니기복합재료공작성급초고역학성능적특수요구,이대참량초세공업폐사취대수니,참가초고경도세집료,채용고온간열양호제도,성공제비출일충초고성능수니기복합재료.대기공작성급불동양호온도화양호시간하적역학성능진행측시,결과표명,제비적재료구유교호적공작특성급초고역학성능,가만족안보산품요구,기항압강도최고가체240 MPa.채용X사선연사기술、차열-열중분석방법급소묘전경대기미관결구형성진행분석,결과현시,초고경도세집료여효응재료적강물리결합사기재복합재료중기증강상적작용,고온양호가속료수니적수화급광물참합료적화산회반응,강저료재료중Ca(OH)2적함량,증가료C-S-H응효적함량,제고료재료적밀실도,개선료계면미관결구,제고료초고성능수니기복합재료적굉관역학성능.
To develop ultra-high performance cementitious composites which fulfill the special requirement of the ATM field on workability as the well as strength of the inorganic composites,replacement of a large quantity of cement with ultra-fine industrial residues was considered.In addition,to improve the compressive strength of UHPCC,ultra-hard fine aggregates were adopted as an alternative scheme.To verify the feasibility of the abovementioned approach,the workability of the newly designed mixtures was investigated,and the static mechanical properties of hardened UHPCC sample cured at different xerothermic temperatures and times were tested.The results demonstrate that the materials prepared in this paper have good flowability and capable of producing ultra-high mechanical performance in order to fit the demand of the safety production. The highest compressive strength of the UHPCC recipe can reach 240 MPa.The structural formation of the ultra-fine industrial residues as well as ultra-hard fine aggregate from the samples was further explored. The microstructure of UHPCC was investigated via X-Ray diffraction,differential thermal analysis (DTA),thermal gravimetric analysis (TGA),and scanning electron microscope(SEM).The results of microstructural experiments reveal that ultra-hard fine aggregates just act as reinforced particles in UHPCC,the high temperature accelerates the hydration of cement.In addition,the secondary pozzolanic reaction of ultra-fine industrial residues with CH decreases the dosage of portlandite,increases the amount of C-S-H gel,makes the structure denser,and improves the interface microstructure and the mechanical properties of UHPCC.