高速公路桥梁用混凝土配合比设计及性能研究  

Design and performance study of concrete mix proportions for highway bridges

作　　者：柴源 刘佳琦 CHAI Yuan;LIU Jiaqi(Guangxi Communications Investment Group Corporation Ltd.,Nanning 530000,China;Nanning College Technology,Guilin 541000,China)

机构地区：[1]广西交通投资集团有限公司,广西南宁530000 [2]南宁理工学院,广西桂林541000

出　　处：《混凝土》2024年第7期215-218,227,共5页Concrete

摘　　要：为了研究高速公路桥梁用C60混凝土,做了混凝土配合比设计、优化及性能研究。通过混凝土基础配合比设计得到基础配合比;粉煤灰单因素试验确定粉煤灰对性能影响及最佳掺量;骨料比例试验确定最佳骨料比例;工程应用测试混凝土工程适应性。结果表明:(1)基础配合比设计得到混凝土坍落度值198 mm,28 d抗压强度仅为60.58 MPa,强度富余远远不足。(2)粉煤灰对混凝土流动性能影响显著,最佳掺量为m(水泥)∶m(粉煤灰)=400∶65。(3)石子占比增加,混凝土坍落扩展度、含气量、抗压强度及劈裂抗拉强度均先增大后减小,确定最佳骨料比例石子∶人工砂=110∶67。(4)工程应用高速公路桥梁用C60混凝土,坍落度达到202 mm,坍落扩展度达到585 mm,含气量3.5%,28 d抗压强度达到67.78 MPa。In order to study the use of C60 concrete for highway bridges,concrete mix design,optimization,and performance research were conducted.Obtain the foundation mix proportion through concrete foundation mix proportion design;Single factor test of fly ash to determine the impact of fly ash on performance and the optimal dosage;Determine the optimal aggregate ratio through aggregate proportion testing;Engineering application testing of concrete engineering adaptability.The results show that(1)The concrete slump value obtained from the basic mix design is 198 mm,and the 28 day compressive strength is only 60.58 MPa,which is far from sufficient strength surplus.(2)Fly ash has a significant impact on the flowability of concrete,and the optimal dosage is m(cement):m(fly ash)-400:65.(3)The proportion of stones increases,and the slump expansion,air content,compressive strength,and spliting tensile strength of concrete all increase first and then decrease.The optimal aggregate ratio of stones:artificial sand=10:67 is determined.(4)The engineering application of C60 concrete for highway bridges has a slump of 202 mm,a slump extension of 585 mm,an air content of 3.5%,and a compressive strength of 67.78 MPa after 28 days.

关 键 词：高速公路 桥梁 C60混凝土 骨料比 流动性能 力学性能 

分 类 号：TU528.062[建筑科学—建筑技术科学]