含有安定性不良钢渣骨料的混凝土病害诊治研究

Study on diagnosis and treatment of concrete diseases containing poor stability steel slag aggregate

某掺入钢渣的现浇混凝土高层住宅项目混凝土表面出现密集鼓起脱落,通过对从现场鼓起部位获得的块状样品和粉末状样品进行电子显微分析、能量色散谱分析和X射线荧光分析,确定混凝土鼓起的原因为混凝土中掺入了安定性不良的钢渣,并获得了安定性不良钢渣的典型微观形貌和元素构成。通过对236个鼓起构件进行分析统计,确定该批混凝土的碳化深度、破坏深度、破坏面直径等指标,为后续研究提供数据支撑。最后,本文建议采用先剔除钢渣和拉毛面层,再挂钢丝网和喷射高强聚合物改性水泥砂浆的处理措施来提高构件耐久性。修复完成后由房屋使用方负责日常巡检,前5年要求每年定期全面巡检1次,5年后每3年定期全面巡检1次。若发现已修补构件出现鼓起现象,应及时请有资质的单位进行检测和处理。

The concrete surface of a cast-in-place concrete high-rise residential project with steel slag was densely bulging and falling off.Through electron microscopy analysis,energy dispersive spectroscopy analysis and X-ray fluorescence analysis of the block samples and powder samples obtained from the site,it was determined that the reason for the concrete bulging was that the steel slag with poor stability was mixed into the concrete,and the typical microstructure and element composition of the steel slag with poor stability were obtained.Through the analysis and statistics of 236 bulging members,the carbonation depth,failure depth and failure surface diameter of this batch of concrete were determined,which provided data support for subsequent research.Finally,this paper proposes to improve the durability of the components by removing the steel slag and the surface layer,then hanging the steel wire mesh and spraying the high-strength polymer modified cement mortar.After the repair is completed,the house user is responsible for daily inspection.In the first five years,it is required to conduct regular comprehensive inspection once a year.After five years,it is required to conduct regular comprehensive inspection once every three years.If it is found that the repaired component has bulging phenomenon,qualified units should be invited to detect and deal with it in time.