Construction of Generalized Theory of Porous Concrete with Small to Very Large Size Aggregates,and Its Application

在这项研究中，它的目的是建立一个基于内部空隙结构的小到非常大尺寸骨料的多孔混凝土的广义理论。研究结果总结如下：(1)制备方法对多孔混凝土的制备方法进行了试验研究，在较大范围内改变孔隙尺寸。此外，为了改进空隙率的测量方法，提出了一种利用空气计测量空隙率的新方法。该方法实现了对连续、半连续和独立空隙的清晰分离。同时，可以期望具有较高的精度，并且可以合理缩短所需的测量时间。(2)孔隙率的质量评价：利用三维数字化仪获得的多孔混凝土表面几何数据，可以评价多孔混凝土的孔隙率。在力学特性方面，研究了大粒径多孔混凝土的抗压强度与孔隙比之间的关系，并提出了一个简单的几何模型来表示这种关系。在体积变化特性方面，阐明了干燥和加热作用下体积变化的基本特性，建立了预测多孔混凝土体积变化特性的模型。在耐久性方面进行了耐磨性试验，阐明了多孔混凝土的耐磨性和耐磨性的基本特性。在热特性方面，对多孔混凝土在盛夏季节的采暖特性进行了一系列室外试验。研究结果明确了多孔混凝土路面的基本加热特性，并表明在城市中部等地使用多孔混凝土建立相对自然的散热系统的可能性。

In this research, it has been aimed to construct a generalized theory of porous concrete with small to very large size aggregates, based on the internal void structure. The results from the present research are summarized as follows :(1) Manufacturing methodExperimental study on the manufacturing method of porous concrete was carried out, varying void sizes in a wide range.In addition, in order to improve the measuring method of void ratio, a new method using an air meter was proposed.The proposed method realizes a clear separation of the sort of voids i.e. continuous, semi-continuous, and independent voids. Also, rather high accuracy can be expected and required time for measurement can be reasonably shortened.(2) Quality evaluationAbout porosity, possibility was shown that void ratio of porous concrete can be evaluated by using geometrical data of a porous concrete surface obtained from a 3-Dimensional Digitizer. About mechanical characteristics, the relationships between compressive strength and void ratio were examined for a wide-range particle size porous concrete, and a simple geometrical model was proposed to represent the relationships. About volume change characteristics, basic properties of volume change by drying and heating were clarified, and a model that can predict the volume change characteristics of porous concrete was established. About durability, wearing test was carried out, and basic properties of porous concrete in wearing and abrasion were clarified. About thermal characteristics, a series of outdoor experiments on heating characteristics of porous concrete in mid-summer was carried out. As a result, fundamental heating characteristics of porous concrete pavement were clarified, and possibility of a relatively natural heat easing system using the porous concrete in a mid-city etc. was shown.