钢壳沉管自密实混凝土工作性能评价方法的对比试验研究  

Comparative Test Study on Work Performance Evaluation Methods of Steel-Shell Submerged Tunnel Used Self-Compacting Concrete

作　　者：于方[1] 宋神友 李汉渤 范志宏[1] 林伟才 罗伟 YU Fang;SONG Shenyou;LI Hanbo;FAN Zhihong;LIN Weicai;LUO Wei(Key Laboratory of Harbor&Marine Structure Durability Technology of Transportation Industry,CCCC Forth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China;Shenzhen-Zhongshan Bridge Management Center,Zhongshan 528400,China;The Second Engineering Company of CCCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510230,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519080,China)

机构地区：[1]中交四航工程研究院有限公司,水工构造物耐久性技术交通运输行业重点实验室,广州510230 [2]深中通道管理中心,中山528400 [3]中交四航局第二工程有限公司,广州510230 [4]南方海洋科学与工程广东省实验室(珠海),珠海519080

出　　处：《硅酸盐通报》2021年第4期1228-1237,共10页Bulletin of the Chinese Ceramic Society

基　　金：广东省重点领域研发计划(2019B111105002)。

摘　　要：自密实混凝土目前尚无统一的工作性能评价方法。通过在室内开展500~850 mm扩展度范围的自密实混凝土工作性能指标的对比试验,从填充性、间隙通过性和抗离析性能三个方面对自密实混凝土的性能评价方法进行了讨论。结果表明:采用坍落扩展度U SF、扩展时间T 500、L型仪测试通过率H 2/H 1和视觉稳定性指数A VSI的综合评价指标可对自密实混凝土的工作性能进行较好的表征;U SF和T 500对自密实混凝土的填充性可以进行比较好的评价;L型仪或J环试验对自密实混凝土的间隙通过性可以进行较好的评价;对现场混凝土的稳定性可先采用视觉稳定性试验(VSI)初步评价,需要定量评价时,可采用离析率筛析试验(GTM筛析法);对侧墙等竖向构件混凝土的抗离析性评价,除了采用GTM筛析法之外,必要时还需增加压力泌水试验。There is no unified approach for evaluating the workability of self-compacting concrete.In this paper,comparison tests were carried out to self-compacting concrete with slump expansion of 500 mm to 850 mm by testing three workability indexes:filling ability,passing ability and anti-segregation ability.Evaluation method of concrete performance was then discussed.The results show that the comprehensive evaluation indexes of slump-flow(U SF),slump time(T 500),L-type instrument passing rate(H 2/H 1)and visual stability index(A VSI)provide good characterization to the workability of self-compacting concrete.U SF and A VSI provide good evaluation to filling ability to self-compacting concrete.L-type instrument or J-ring test provide good evaluation to passing ability of self-compacting concrete.The stability of on-site concrete preliminarily evaluates by visual stability test(VSI)first,and then by segregation rate sieve test(GTM sieve analysis method)when quantitative evaluation is needed.In addition to GTM sieve analysis method,pressure bleeding test should be added when necessary for the anti-segregation evaluation of concrete of vertical members such as side walls.

关 键 词：钢壳沉管 自密实混凝土 工作性能指标 评价方法 填充性 间隙通过性 抗离析性 

分 类 号：TU525[建筑科学—建筑技术科学]