CAJ | 학술논문

为解决高速铁路CRTSⅢ型板式无砟轨道结构高施工性、高平顺性和高耐久性要求，采用具有高流动性、高塑性稳定性和低收缩变形的自密实混凝土作为无砟轨道充填层材料。针对充填层的封闭结构空间和承载功能，并结合设计和无砟轨道结构对自密实混凝土的要求，制备了 C30，C40和 C50三种强度等级自密实混凝土，进行体积稳定性试验、氯离子渗透试验和单边冻融试验，研究其工作性能、体积稳定性和耐久性能。结果表明：三种自密实混凝土均具有适合板式无砟轨道充填层施工的良好工作性能；其塑性收缩变形均随着强度等级的提高而增大；在水胶比相同和单方用水量相同两种情况下三种自密实混凝土的干燥收缩变形呈现出完全相反的变化规律；三种自密实混凝土均具有良好耐久性，抗氯离子渗透能力随强度等级的提高而降低，抗盐冻性能则随着强度等级的提高而增强。
위해결고속철로CRTSⅢ형판식무사궤도결구고시공성、고평순성화고내구성요구，채용구유고류동성、고소성은정성화저수축변형적자밀실혼응토작위무사궤도충전층재료。침대충전층적봉폐결구공간화승재공능，병결합설계화무사궤도결구대자밀실혼응토적요구，제비료 C30，C40화 C50삼충강도등급자밀실혼응토，진행체적은정성시험、록리자삼투시험화단변동융시험，연구기공작성능、체적은정성화내구성능。결과표명：삼충자밀실혼응토균구유괄합판식무사궤도충전층시공적량호공작성능；기소성수축변형균수착강도등급적제고이증대；재수효비상동화단방용수량상동량충정황하삼충자밀실혼응토적간조수축변형정현출완전상반적변화규률；삼충자밀실혼응토균구유량호내구성，항록리자삼투능력수강도등급적제고이강저，항염동성능칙수착강도등급적제고이증강。
In order to settle the problems about high construction ability,high comfort and high durability of high-speed railway CRTS Ⅲ slab-type ballastless track,self-compacting concrete( SCC ) was used as ballastless track filling layer material which has high flowing ability,high plastic stability and low shrinkage. According to the closed space structure and bearing ability of filling layer,three types of SCC with different compressive strength grade ( C30,C40 and C50) were made by combining with SCC requirements of designing ballastless track structure, volume stability test,chloride ion penetration test and unilateral freeze-thaw test were implemented,and workability, volume stability and durability were studied. The results showed that three kinds of SCC have a good workability which is suitable to filling layer construction of slab ballastless track,plastic-shrinkage of SCC increases with compressive strength grade increasing,drying-shrinkage of three types show different changing laws with the same water-binder ratio and the same unilateral water content and have good durability,chloride ion impermeability of SCC decreases with increasing of the compressive strength grade,and freeze-deicing salt resistance of SCC increases with compressive strength grade increasing.