水锈面粗集料对混凝土性能影响研究  

Study on the effect of water rust aggregate on concrete performance

作　　者：刘雄伟 LIU Xiongwei(Hebei Provincial Research Center of Road Structures and Material Engineering Technologies,Hebei Shijiazhuang 050091 China;Hebei Provincial Communications Planning Design and Research Institute Ruizhi Transportation Technology Consulting Co.,Ltd.,Hebei Shijiazhuang 050091 China)

机构地区：[1]河北省道路结构与材料工程技术研究中心,河北石家庄050091 [2]河北交规院瑞志交通技术咨询有限公司,河北石家庄050091

出　　处：《山东交通科技》2024年第5期61-65,共5页

基　　金：河北省重点研发计划项目,项目编号:20310802D。

摘　　要：研究了20%、40%和60%掺量下单面水锈粗集料(风化面积≤1/4)与双面水锈粗集料(风化面积>1/4)对C30混凝土抗压强度、抗折强度、电通量、200次冻融循环下相对动弹性模量和质量损失的影响。使用扫描电镜分别观测了粗集料水锈面与正常表面的微观结构与成分组成,以及冻融前后混凝土中水锈面、正常面与砂浆之间的界面变化。结果显示:随粗集料中水锈颗粒含量的增加,混凝土的抗压、抗折强度和相对动弹模量降低,电通量与冻融循环质量损失增大。其中,抗折强度、电通量和相对动弹模量变化较为显著。在相同掺量下,双面水锈粗集料对混凝土性能的影响均大于单面水锈粗集料。SEM测试显示,粗集料水锈面表面疏松,水锈面与水泥浆在冻融前即存在细微裂缝,而经冻融循环后裂缝开始变得较为明显。从试验结果来看,在有抗冻性要求时,将双面水锈颗粒含量控制在25%以内是比较合理的,单面水锈颗粒含量超过60%时会对混凝土性能产生明显的影响。In order to study the influence and explore the reasonable range of application of water rust gravel in concrete,the effects of 20%,40%and 60%mixtures on compressive strength,flexural strength,electric flux,relative dynamic modulus and mass loss of C30 concrete were studied respectively.The appearance morphology of water rust surface and normal surface of gravel,and the interface changes between water rust surface,normal surface and mortar in concrete before and after freezing and thawing were observed by scanning electron microscope.The results show that the compressive strength,flexural strength and relative dynamic modulus of concrete decrease,and the electrical flux and freeze-thaw cycle mass loss increase with the increase of the content of water rust particles in the coarse aggregate.Among them,the flexural strength,electric flux and relative dynamic modulus change significantly.Under the same dosage,the influence of double-sided rusted gravel on concrete performance is greater than that of single-sided rusted gravel.SEM test shows that the surface of gravel rust surface is loose,and there are fine cracks between the rust surface and mortar before freezing-thawing,but the cracks become more obvious after freezing-thawing cycle.From the test results,when there is frost resistance requirements,it is reasonable to control the content of double-sided rust particles within 25%,when the content of single-sided rust particles exceeds 60%,it will have a significant impact on the performance of concrete.

关 键 词：水锈粗集料 抗压强度 抗折强度 电通量 相对动弹性模量 

分 类 号：TU528.3[建筑科学—建筑技术科学]