Preparation of Paver Bricks Having both Water Retainability and Frost Resistance by Designing Macro Porous Structure

We investigated to add some high functionality to the brick by controlling the porous structure of the brick. It was succeeded in this study that a great many minute continuous pores which lead to capillary action were introduced inside of bricks in order to bring about “UCHIMIZU effect” for suppressing urban heat island phenomenon. But, as for the high water retainable pavement material like that brick, it is broken by water freezing in winter, and from this reason any pavement material with “UCHIMIZU effect” are not readily spread in through the all over Japan. Then, preparation of the brick which had both water retainability and frost resistance was tried by introducing much space into the brick inside to be able to permit the solidification expansion of water, and examined influence on properties of the brick by the quantity of porosity. From results, it was suggested that water retainability and frost resistance were able to be given to the brick at the same time by using the cavity formation materials.