Paper by SOLIS LLORENTE MIGUELA BOLLATI from ISCR 8th 1998 Lisbon Portugal
The properties of High performance Porous Concrete (HPPC) paving may be described as a midpoint between flexible and rigid paving. The result of many years of research, especially as regards the materials used, we suggest this is an ideal solution to the problems currently experienced with pavements of a porous structure and with road surfaces in general. The design has been developed with the aim of including and improving the best features of each type of road surface, e.g. the driving comfort of flexible surfaces, and the durability of concrete surfaces. It differs from flexible porous surfaces mainly in that it is not subject to warping due to age, traffic load or ambient conditions, thus maintaining its porous structure throughout its useful life. High Performance Porous Concrete paving differs from conventional concrete road surfacing in that the volumetric proportion of gaseous phase, constitute 20% of the total volume of the structural matrix once hardened. Average 28 day resistance to bending in 15 x 15 x 60 cm prismatic test specimen with 20% macroporous structure in the last experimental section built was 6 Mpa.. The design characteristic resistance to bending is 4 Mpa HPPC, as its name suggests, is a very high performance concrete, which may be placed with standard equipment, such as asphaltic mix spreaders, and offers greater driving comfort and user safety than other concretes used to date.