Historical experience is a mirror.
Glass bead is a kind of good reflective material for road surface, which is used as road marking on highway, expressway and airport runway in foreign countries. At night, the lights of cars and airplanes shine on the glass beads to form reflection, which is used for guiding and navigation. In the eighties and nineties of the 20th century, this new reflective material was also developed in China. At the beginning of its use, the effect was ok, but later, with the passage of time, the reflective effect of glass beads became worse and worse, and finally it could not be used at all. After all, it is because of the poor use environment of glass beads. In most areas of our country, there is a large amount of dust in the air, and there are too many inhalable particles. The yellow dust is rolling on the road. In addition, the road and airport runway cleaning measures are not enough or not at all. The dust on the ground and the mud in rainy and snowy days are all covered on the glass beads as the road signs. It is not surprising that the reflective function of the beads will eventually disappear without timely cleaning.
Concrete interlocking block is a kind of good ground and pavement material, mainly used in sidewalk, square, port wharf, airport apron and other places. When China began to develop and popularize the use of this kind of block, some cities produced the cast colored smooth surface brick. When the author investigated in Europe, the United States, Australia and New Zealand, he found that they produced and used the pressed cement natural color rough surface brick. Why is there such a difference? The reason is that the environmental conditions are different. These countries have good environmental governance, high air purification, no dust, cement natural color pavement brick, rough surface, and will not hide dirt and dirt, and in rainy and snowy days, it can prevent skidding, reduce or avoid pedestrian slipping. In some cities of our country, the use of colored smooth pavement brick to pave sidewalks is to consider the high dust content in the air, and the mud is everywhere in rainy and snowy days. It is difficult to detect the dust on the colored pavement brick; the smooth pavement brick is easy to be cleaned with water in rainy and snowy days, but the smooth surface is easy to slide pedestrians and cause accidental injury.
From the point of view of the setbacks and even the failure in the promotion and use of glass beads and concrete interlocking blocks, we can't ignore the same problems that are inevitable and must be solved in the production and use of permeable bricks, and discuss and study the impact of the use environment on the permeable function of permeable bricks, so as to make the market positioning and promotion of permeable bricks in line with the actual situation in China Development planning.
The pervious function of pervious brick is that water penetrates along the open capillary channel in the brick under the action of gravity. Foreign countries mainly use in temperate, subtropical and tropical areas with more rainfall and relatively concentrated rainfall, but the amount of use is small. In Europe, Australia, New Zealand and other places, pervious bricks are used in city squares, parks and amusement parks, but they are not used in sidewalks. Generally, the environment of the city used is well controlled, the air is humid and the purification degree is high, the road surface and the ground are clean, and there is no dirt.
China's environmental governance has also made great progress in recent years, with blue sky and white clouds rising year by year, but there is still a big gap compared with northern Europe, Australia, New Zealand and other developed countries. Not to mention sandstorm, that is, the dust content in the air, the dust in the city and the muddy water after the rain and snow may block the pervious passage in the pervious brick and even partially or completely lose the pervious function. Therefore, people can't help asking: can the pervious function of pervious brick displayed in the exhibition stand or laboratory be fully exerted and maintained for a long time in the actual use of the ground?
