CAJ | 학술논문

黄韩侯铁路上的桥梁设计为后张法预应力混凝土T形简支梁，主梁在制梁场预制，要求混凝土强度等级为C55，56 d混凝土的电通量≤1000 C。考虑碎石的技术指标、运距和成本因素，选取了黑云母花岗闪长岩碎石和结晶灰岩碎石2种粗骨料。为优选出满足要求的碎石，配制满足工程要求的混凝土，采用这2种粗骨料配制C55混凝土，对混凝土的拌合物工作性、力学性能及抗氯离子渗透性能等进行试验，并采用光学显微镜对2种粗骨料的微观结构进行了分析。结果表明：使用黑云母花岗闪长岩碎石配制的C55耐久混凝土的弹性模量及电通量不能满足铁路规范要求，而使用结晶灰岩碎石配制的C55耐久混凝土的弹性模量及电通量均能满足铁路规范要求。
황한후철로상적교량설계위후장법예응력혼응토T형간지량，주량재제량장예제，요구혼응토강도등급위C55，56 d혼응토적전통량≤1000 C。고필쇄석적기술지표、운거화성본인소，선취료흑운모화강섬장암쇄석화결정회암쇄석2충조골료。위우선출만족요구적쇄석，배제만족공정요구적혼응토，채용저2충조골료배제C55혼응토，대혼응토적반합물공작성、역학성능급항록리자삼투성능등진행시험，병채용광학현미경대2충조골료적미관결구진행료분석。결과표명：사용흑운모화강섬장암쇄석배제적C55내구혼응토적탄성모량급전통량불능만족철로규범요구，이사용결정회암쇄석배제적C55내구혼응토적탄성모량급전통량균능만족철로규범요구。
The bridge on the Huangling-Hancheng-Houma Railway is a post-tensioned pres-tressed concrete simply supported T-shaped girder bridge .The main girder was prefabricated in the workshop ,the strength of concrete was required being C55 and the electric flux of the concrete aging 56 d being no less than 1 000 C .Given the technical indexes ,transportation distance and cost of the crushed stones ,the biotite granodiorite gravels and crystalline limestone gravels were con-sidered .In order to select out the type of gravels that can meet the requirements so as to prepare the concrete which suits the project demands ,the two kinds of aggregates aforementioned were used to prepare C55 concrete ,with the intention of testing the properties of the mixing materials , mechanical behavior and resistance to chloride ion penetration of the concrete .In addition the opti-cal microscope was used to analyze the microstructure of the two kinds of aggregates ,The results indicate that the elastic modulus and electric flux of the C55 concrete with biotite granodiorite gravels can not meet the railway code requirements ,but those of the C55 concrete with crystalline limestone gravels can meet the railway code requirements .