摘  要：依托某在建地铁工程，通过对管片混凝土、盾构注浆、地下水质、泛白物等进行试验检测和研究，并结合同批次管片拼装后的实际情况，分析了管片渗水处泛白的原因。结果表明，管片渗水部位的泛白是盾构注浆浆体中的Ca(OH)2随渗水水流进入管片，在管片表面与空气中的CO2发生化学反应，产生白色的碳酸钙，而不是管片混凝土自身的泛碱。 Abstract： Thereasonofproducingwhitesubstancewereanalyzed,testingsoftheconcreteforsegment、groutingslurryforshield、qualityofundergroundwaterandthewhitesubstance,andtheactualsituationofthesamebatchofshieldsegmentthatalreadyinstalled.Theresultsshowthatthewhitesubstanceproducedonthesurfaceofshieldsegmentnearthepositionofitsseepageiswhitecalciumcarbonate,whichproducedbycalciumhydroxidetransferringtothesurfaceofshieldsegmentbywaterfromgroutingslurry,andcarbondioxidefromair,butnotcrystallinebloomofconcreteshieldsegment.

赵亮,黄毓彬.地铁盾构管片渗水部位泛白现象的试验研究[J].混凝土与水泥制品,2020(2):32-36,46. ZHAO L,HUANG Y B.Study of a Phenomena that White Substance Produced on the Surface of Shield Segment in Metro near the Position of Its Seepage[J].China Concrete and Cement Products,2020(2):32-36,46.

摘  要：基于CRTSⅢ型板自密实混凝土配制技术和研究经验，结合商合杭客运专线CRTSⅢ型板自密实混凝土灌揭扳工艺性试验及现场施工实践，总结了CRTSⅢ型板自密实混凝土的配制方法、混凝土质量控制技术、施工质量控制技术。通过工艺性试验确定了CRTSⅢ型板自密实混凝土最佳的灌注工艺流程、施工质量控制参数及指标，总结了CRTSⅢ型板自密实混凝土配制及施工质量控制关键要点。结果表明，扩展度为640～660mm，T500最佳范围在4～6s，灌注时间为8～12min较好，应用此工艺能够确保CRTSⅢ型板自密实混凝土大规模施工时的质量符合相关标准和设计要求，并大幅提升了灌注施工质量的稳定性。 Abstract: BasedonthepreparationtechnologyandresearchexperienceofCRTSⅢslabself-compactingconcrete,andcombinedwiththetechnicaltestandfieldconstructionpracticeofCRTSⅢslabself-compactingconcreteinShanghe-hangpassengerdedicatedline,thepreparationmethod,concretequalitycontroltechnologyandconstructionqualitycontroltechnologyofCRTSⅢslabself-compactingconcretewerediscussed.Throughtheprocesstest,theoptimalinfusionprocess,constructionqualitycontrolparametersandindexesofCRTSⅢself-compactingconcreteweredetermined,andthekeypointsofCRTSⅢself-compactingconcretepreparationandconstructionqualitycontrolweresummarized.Theresultsshowthattheexpansiondegreeis640～660mm,theoptimumrangeofT500is4～6s,andthepouringtimeis8～12min.TheapplicationofthistechnologycanensurethatthequalityofCRTSⅢslabself-compactingconcretemeetstherelevantstandardsanddesignrequirementsinlarge-scaleconstructionandgreatlyimprovethequalitystabilityofpouring.

童小飞,刘磊,王成启.CRTSⅢ型板自密实混凝土配制及施工关键技术研究[J].混凝土与水泥制品,2020(2):37-41.
TONG X F,LIU L,WANG C Q.Research on the Key Technology of Preparation and Construction of CRTSⅢ Self-compacting Concrete Slabs[J].China Concrete and Cement Products,2020(2):37-41.

摘  要：为了研究分布筋对ECC压杆性能的影响，对5个ECC独立压杆进行了受压试验。研究表明，在ECC压杆中有必要布置钢筋，且仅配竖向分布筋不利于裂缝的控制；双向配置0.0016的分布筋更有利于充分发挥材料的性能和控制试件使用阶段的裂缝；试验得到的ECC的压杆有效影响系数均大于1.6；减少50%的分布筋用量后ECC压杆仍可获得与混凝土类似的压杆强度。 Abstract: InordertostudytheeffectofwebreinforcementonthebehaviorofECCstruts,atotalof5ECCisolatedstrutsweretestedtofailure.Theresultsofthisinvestigationreveal:reinforcementisindispensabletoECCstrutsandonlyverticaldistributionofreinforcementisnotconducivetocrackcontrol.Thebi-directionalwebreinforcementof0.0016ismoreconducivetotakingfulladvantageofthematerialsandcontrollingthecracksintheservicestageofspecimens.TheexperimentalstrutefficiencyfactorofallECCisolatedstrutsarelargerthan1.6.Comparingtoreinforcedconcretestruts,ECCisolatedstrutscanstillobtainsimilarstrutstrengthafterreducingthewebreinforcementusageby50%.

罗敏,胡世翔.分布筋对ECC压杆性能的影响研究[J].混凝土与水泥制品,2020(2):42-46.
LUO M,HU S X.Study on Influence of Distributed Reinforcement of ECC Struts[J].China Concrete and Cement Products,2020(2):42-46.