Evaluation of the Fluidity of Antiwashout Underwater Concrete by Using the Fluidity of Mortar

利用砂浆流动度评价水下抗冲刷混凝土的流动度

• 批准号: 04650420
• 负责人: OTSUKI Nobuaki
• 金额: $ 1.28万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650420/
• 关键词: Antiwashout Underwater Concrete; Superplasticizer; M-mortar; W-mortar; Fluidity; Slump Flow; Viscosity; Segregation; 降伏値; 見かけ粘度; ずり速度; 振動式音又型粘度計; スランプ・スランプフロー; 粗骨材体積濃度

Antiwashout underwater concrete is quite different in concept from conventional underwater concrete. That is the viscocity of the concrete was increased and its resistance to segregation under the washing action of water was enhanced by mixing an antiwashout admixture with the concrete.In this study, the authors intend to evaluate the fluidity and the segregation resistance by the rheological properties of mortar and the volume percentage of aggregate. It means the concrete is treated as two phase materials, as namely assumed to be consisted of mortar and coarse aggregate phases. Also, the authors are very serious about the fresh state of mortar. So, the properties of wet-screened mortar(hereinafter referred as W-mortar)and those of normal mortar(hereinafter referred as M-mortar)are carefully compared.The following conclusions can be obtained from the present study.1.The slump flow of the antiwashout underwater concrete can be predicted by the mortar flow of M-mortar and the volume percentage of coarse aggregate.2.The segregation resistance of antiwashout underwater concrete can be evaluated by the mortar flow of M-mortar and the volume percentage of coarse aggregate.3.The viscosity of M-mortar is clearly larger than that of W-mortar.

水下不分散混凝土与常规水下混凝土在概念上有很大区别。通过砂浆的流变性能和骨料的体积分数来评价混凝土的流动性和抗离析性能。这意味着混凝土被视为两相材料，即假定由砂浆和粗骨料相组成。此外，作者对砂浆的新鲜状态非常认真。所以，湿筛砂浆性能（以下简称W砂浆）和普通砂浆通过对M-砂浆的流动性进行分析比较，得出以下结论：1.可以用M-砂浆的流动性来预测水下不分散混凝土的坍落度流动性; 2.水下不分散混凝土的抗离析性能可以用M-1砂浆流动度来评价。3. M砂浆的粘度明显大于W砂浆。

项目成果

Nobuaki OTSUKI: "Underwater Concreting in Japan-Especially Antiwashout Underwater Concrete" Asean Science & Technology Week. VIII. 186-197 (1992)

Nobuaki OTSUKI：“日本的水下混凝土——特别是防冲刷水下混凝土”东盟科学

Nobuaki OTSUKI and Makoto HISADA18GB03 : Evaluation of Workability of Antiwashout Underwater Concrete by Using Mortar: Proceedings of The 20th.JUCC Congress on Cement and Concrete. 49-56 (1993)

Nobuaki OTSUKI 和 Makoto HISADA18GB03：使用砂浆评价水下抗冲刷混凝土的和易性：第 20 届 JUCC 水泥和混凝土大会论文集。

大即 信明: "海洋構造物への水中不分離性コンクリートの応用" 材料学会関東支部セミナー. 6-1-6-10 (1993)

Nobuaki Ohsoku：“水下不可分离混凝土在海上结构中的应用”关东分会研讨会，日本材料学会 6-1-6-10 (1993)。

大即 信明・長滝 重義・鎌田 敏郎・久田 真: "水中不分離性コンクリートのモルタルによる流動性評価" 第20回セメント・コンクリート研究討論会. 49-56 (1993)

Nobuaki Ozoku、Shigeyoshi Nagataki、Toshiro Kamata 和 Makoto Hisada：“使用砂浆的水下不可分离混凝土的流动性评估”第 20 届水泥和混凝土研究会议 49-56 (1993)。

Nobuaki OTSUKI: "Application of Antiwashout Underwater Concrete for Marine Structures" JSMS Kanto Branch Workshop on Advanced Technology of High Performance Concrete. 6.1-6.10 (1993)

Nobuaki OTSUKI：“海洋结构物中抗冲刷水下混凝土的应用”JSMS关东分会高性能混凝土先进技术研讨会。