The investigation on the mechanism of liquid and gas diffusion in concrete crack interface by consideration of the chemical and physical characteristics of adsorption

考虑吸附化学和物理特性研究混凝土裂缝界面液体和气体扩散机理

• 批准号: 09305031
• 负责人: TANABE Tada-aki
• 金额: $ 18.5万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09305031/
• 关键词: Difusion; Porous Material; Vapor; Energy level; Laser Sensor; Specimen Cell; 吸着熱; ミクロ空隙; メゾ空隙; マクロ空隙; 吸着拡散速度; 吸着外拡散速度; 浸透係数; メゾ・マクロ空隙の空間分布

In this research, the mechanism of the diffusion of water through concrete pores of various sizes considering the chemical and physical characteristics of adsorption was mainly investigated. Through this research, the followings have been obtained.(1) The defects sometimes called as cracks can be classified into micropore, mesopore and macropore respectively. It is thought that adsorption and non-adsorption diffusion phenomenon exist. Darcy 's law can be applied to the non-adsorption diffusion in the crack which width is more than 0.05mm. And the diffusivity is dependent on the crack width which is less than 0.05mm. Since a lot of experiment could not be made in this research, the mathematical modeling of the relation between the diffusivity and the crack width has not been completed. However, this will be solved as research is carried on from now on.(2) In many cases, the formation of micropore and mesopore are decided by mixture and the casting method of concrete. Therefore, the spac … More e distribution and surface property cannot be obtained directly. However, within the range between mesopore and macropore, the form of the surface could be measured using surface analysis equipment. And the results of (1) were obtained from the outflow experiment in each surface. Mesa and macropore measurement of a space distribution and surface property will also be carried out from now on.(3) Using the adsorption measurement equipment, the velocity coefficient of adsorption on the concrete surface corresponding to relative pressure could be measured. This speed velocity coefficient of adsorption can be called as adsorption diffusivity in nonsaturated pore.(4) If the space distribution of a crack can be understood correctly and the model of adsorption and non-adsorbing diffusion can be build, the water diffusion phenomenon in a complicated porous material can be analyzed numerically, and the results can be applied to various practical uses. Through this research, the prospect of the achievement of our aims can be seen. Less

在本研究中，考虑到吸附的化学和物理特性，主要研究了水在不同大小的混凝土孔隙中的扩散机理。通过本文的研究，得到了以下结论：(1)有时称为裂纹的缺陷可分为微孔、中孔和大孔。认为存在吸附和非吸附扩散现象。达西S定律适用于宽度大于0.05 mm的裂纹中的非吸附扩散。扩散系数与裂缝宽度有关，裂缝宽度小于0.05 mm。由于本研究不能进行大量的实验，因此还没有完成扩散率与裂缝宽度之间关系的数学建模。在很多情况下，混凝土的微孔和中孔的形成取决于混合料和混凝土的浇筑方法。因此，SPAC…更多的e分布和表面性质不能直接获得。然而，在中孔和大孔之间的范围内，可以使用表面分析设备来测量表面的形状。并通过各表面的出流实验，得到了(1)的结果。今后还将进行台面和大孔的空间分布和表面性质的测量。(3)使用吸附测量设备，可以测量相对压力对应的混凝土表面的吸附速度系数。这个吸附速度系数可以称为非饱和孔隙中的吸附扩散系数。(4)如果能够正确理解裂隙的空间分布，并建立吸附和非吸附扩散模型，就可以对复杂多孔材料中的水扩散现象进行数值分析，其结果可以应用于各种实际应用。通过这项研究，可以看到我们目标实现的前景。较少

项目成果

sato, R.: "Effect of tension softening on time-dependent deformation and crack width of Reinforced Concrete flexural members" Proceedings FRAMCOS-3. 1341-1352 (1998)

sato, R.：“拉伸软化对钢筋混凝土弯曲构件随时间变化和裂缝宽度的影响”论文集 FRAMCOS-3。

遠藤 孝夫: "非貫通ひび割れを有するコンクリートの水密性評価の検討" コンクリート工学年次報告集. 発表予定. (1999)

Takao Endo：“非贯穿性裂缝混凝土的水密性评价研究”《混凝土工程年度报告》预定出版。

林昌弘: "荷重履歴を受けるコンクリート中の間隙水圧に関する実験的研究" コンクリート工学年次報告集. (発表予定). (1998)

Masahiro Hayashi：“受荷载历史影响的混凝土孔隙水压力的实验研究”混凝土工程年度报告（待出版）。

斉藤 理浩: "乾湿変化による乾燥収縮の解析的評価" コンクリート工学年次報告集. 発表予定. (1998)

Michihiro Saito：“干燥和湿度变化导致的干燥收缩的分析评估”混凝土工程年度报告计划出版（1998 年）。

Yamamoto, K.: "The experimental study of one dimension inner humidity and orthogonal-deformation in mortar with drying" Proceedings of JCI. Vol.21. (1999)

Yamamoto, K.：“干燥砂浆中一维内部湿度和正交变形的实验研究”JCI 论文集。