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

本研究主要研究了考虑吸附的化学和物理特性的水通过不同尺寸的混凝土孔隙的扩散机制。通过本研究，得到以下结论：(1)有时称为裂纹的缺陷可分别分为微孔、中孔和大孔。认为存在吸附和非吸附扩散现象。达西定律适用于宽度大于0.05mm的裂纹中的非吸附扩散。扩散率取决于小于0.05mm的裂纹宽度。由于本研究无法进行大量实验，因此尚未完成扩散率与裂纹宽度关系的数学建模。不过，随着今后研究的进行，这个问题将会得到解决。(2)在很多情况下，微孔和中孔的形成是由混凝土的配合比和浇注方法决定的。因此，空间分布和表面性质无法直接获得。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。 (1)的结果是从每个表面的流出实验中获得的。今后还将开展空间分布和表面性质的台面和大孔测量。(3)利用吸附测量装置，可以测量相对压力对应的混凝土表面吸附速度系数。这个吸附速度的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纹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用途。通过这项研究，我们可以看到实现目标的前景。较少的

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