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

在这项研究中，基于内部空隙结构，构建了具有小颗粒到超大颗粒骨料的多孔混凝土的广义理论。主要研究成果如下：(1)制备方法对多孔混凝土的制备方法进行了实验研究，在较大范围内改变了孔洞的大小，并提出了一种新的气孔率测量方法，该方法实现了连续、半连续和独立三种孔洞的清晰分离。此外，可以预期较高的精度，并且可以合理地缩短测量所需的时间。(2)质量评价关于孔隙率，证明了利用从三维数字化仪测得的多孔混凝土表面的几何数据来评价多孔混凝土的孔隙率的可能性。在力学特性方面，研究了大颗粒多孔混凝土的抗压强度与空隙率之间的关系，并提出了一个简单的几何模型来描述这种关系。在体积变化特性方面，阐明了干燥和受热时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，进行了耐磨试验，明确了多孔混凝土的基本磨损性能。在热特性方面，进行了盛夏季节多孔混凝土的一系列室外热特性试验。阐明了多孔混凝土路面的基本热特性，提出了在中部城市等地利用多孔混凝土实现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.