ON THE DEVELOPMENT OF ESTIMATING METHOD FOR RELATIVE DENSITY IN COMPACTING LAYER OF ROLLER COMPACTED CONCRETE

碾压混凝土压实层相对密度估算方法的研制

• 批准号: 11555119
• 负责人: KOKUBU Katsuro
• 金额: $ 4.03万
• 依托单位: TOKYO METROPOLITAN UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555119/
• 关键词: roller compacted concrete; compacting function; energy of compaction; distribution of relative density; simulation of compaction; inverse analysis; visualized experiment; surface vibrator; 超硬練りコンクリート; 充填率; シミュレーション; 振動締固め

This research project aims to develop the method for estimating the distribution of relative density in roller compacted concrete layer. Main experiments and computation in this research were carried out on the propagation of acceleration from surface vibrator to concrete, on the visualized experiment of concrete compaction and on the inverse analysis for identifying the mechanical constant of freshly mixed extremely dry concrete. And we developed a simulation program for estimating the distribution of relative density in roller compacting concrete layer. The results from this research are as follows.To develop a simulation program of surface compaction, the extremely dry concrete is represented by Voigt model, the compacting layer is represented by multi-layers of Voigt models and the base is represented by spring model. The structural model of computation is combined directly every element of a vibrator, compacting layer and supporting base. When a tensile stress is calculated in a model under computation, the node is disjoined between the vibrator and the top layer, then recalculated. This calculation technique was able to simulate the jumping behavior of a surface vibrator. The stiffer the supporting base is, the lower the relative density of bottom layer becomes by surface vibration. Also the difference in density between top and bottom layer becomes larger. The more elastic support makes the uniform density of layer.The compacting energy was calculated from the estimated acceleration in the structural model of computation. And the relative densities of every layer were derived from the compacting function of used concrete. The results of computation simulated the measured density with good accuracy.6. The developed simulation program of surface compaction is able to estimate the relative density of every layer under given vibrating and supporting condition, and to contribute to reduce the experiment at job site.

本研究旨在发展碾压混凝土层内相对密度分布的估算方法。本研究的主要试验和计算内容包括振捣器加速度向混凝土的传递、混凝土压实的可视化试验和识别新拌极干混凝土力学常数的反分析。并编制了碾压混凝土层相对密度分布的模拟计算程序。研究结果如下：（1）为了编制表面压实模拟程序，将特干混凝土用Voigt模型表示，压实层用多层Voigt模型表示，基层用弹簧模型表示。计算结构模型直接将振捣器、压实层和支承基础的各个单元组合起来。在计算模型中计算拉应力时，将振子与顶层之间的节点分离，然后重新计算。这种计算技术能够模拟表面振动器的跳跃行为。支承基底刚度越大，表面振动引起的底层相对密度越低。顶层和底层之间的密度差也变得更大。在计算模型中，压实能由估算的加速度计算得到。并根据旧混凝土的压实函数推导出各层的相对密度。计算结果与实测密度吻合较好.所开发的表面压实模拟程序能够在给定的振动和支承条件下估算出各层的相对密度，有助于减少现场试验。

项目成果

Takasuke MOGI, Hiroshi OGASAWARA and Makoto KAGAYA: "ON THE PROPAGATION OF ACCELERATION AND DISTRIBUTION OF RELATIVE DENSITY IN ROLLER COMPACTED CONCRETE"Proceedings of Annual Meeting, Tohoku Branch of Japan Society of Civil Engineers. (2002)

Takasuke MOGI、Hiroshi OGASAWARA 和 Makoto KAGAYA：“关于碾压混凝土中加速度的传播和相对密度的分布”日本土木工程师学会东北分会年会记录。

茂木 孝裕, 小笠原 洋, 加賀谷 誠: "超硬練りコンクリートの振動転圧による加速度伝播と充填率分布"土木学会・東北支部技術研究発表会. (印刷中). (2002)

Takahiro Mogi、Hiroshi Ogasawara、Makoto Kagaya：“超硬混合混凝土振动滚动引起的加速度传播和填充率分布”日本土木工程师学会东北分会技术研究报告（2002 年出版）。

杉森誠志,國府勝郎,三栖幸彦,上野敦,早川健司: "転圧コンクリートの配合設計,転圧設計および施工管理に対する締固め性試験の応用"フレッシュコンクリートのコンシステンシー評価に関する技術の現状と課題,土木学会コンクリート技術シリーズ. 37. 1-8 (2000)

Seiji Sugimori、Katsuro Kokufu、Yukihiko Misu、Atsushi Ueno、Kenji Hayakawa：“压实试验在压实混凝土配合比设计、压实设计和施工管理中的应用”新拌混凝土稠度评价相关技术的现状和问题，日本土木学会工程师混凝土技术系列。 37. 1-8 (2000)

西治郎, 佐々木智, 菅井幸仁, 遠藤孝夫: "振動締固めを受けるRCCの動的挙動に関する解析的検討"コンクリート工学年次論文報告集. Vol.21. No.2 307-No.2 312 (1999)

Jiro Nishi、Satoshi Sasaki、Yukihito Sugai、Takao Endo：“振动压实下碾压混凝土的动态行为分析”，《混凝土工程年刊》第 21 卷，第 2 307 期-第 2 312 期（1999 年）。

Makoto KAGAYA, Toru SUZUKI, Shuichi KOKUBUN and Hiroshi TOKUDA: "A STUDY ON MIX PROPORTIONS AND PROPERTIES OF STEEL FIBER REINFORCED ROLLER COMPACTED CONCRETE FOR PAVEMENTS"JSCE Journal of Materials, Concrete Structures and Pavements. No. 669, V-50. 253-2

Makoto KAGAYA、Toru SUZUKI、Shuichi KOKUBUN 和 Hiroshi TOKUDA：“路面用钢纤维碾压混凝土的配合比和性能研究”JSCE 材料、混凝土结构和路面杂志。