Permeable bricks are now widely used in urban road construction. According to experts, laying bricks in cities has three effects. First, groundwater can be repaired. Secondly, it can reduce the urban heat island effect. Third, permeable bricks penetrate deep into the ground, and the evaporated water can increase humidity, improve climate, and reduce respirable dust and particulate matter. However, although permeable bricks are relatively ambitious products, the Municipal Planning Commission is also strongly demanding that municipal equipment and residential areas be paved with permeable bricks, but it seems that the results are not very ambitious. Two reasons hindered the promotion of permeable bricks. In response to this situation, the reporter came to Beijing Shengtai Weiye Science and Technology Development Co., Ltd., the earliest developer of permeable bricks, and interviewed the company's principal Li Shengyong. There are no local regulations for Beijing. "He stated that the national regulations are relatively low and cannot satisfy the needs of Beijing's urban functions. Although the Municipal Planning Commission has forced the use of permeable bricks, two major factors restrict the use of permeable bricks. One is the lack of production capacity in this city. At present, the manufacturers with a certain technological content in this city only need more than 10 million square meters of annual production capacity, which cannot meet the demand of more than 20 million square meters. Second, the price of permeable bricks is 20% more expensive than ordinary bricks, making investors reluctant to “pay out of pocket”. In addition, "traditional permeable bricks use general cement as a binder, which has poor resistance and low strength. In addition, Beijing is colder in winter, and the water absorbed in the cement will freeze in winter, making permeable bricks easy to change after two or three years of use. Crisp. "Buying permeable bricks cannot be cheap. Now, the price of permeable bricks in this city is 30 to 300 yuan per square meter. Cheap permeable bricks are mostly single permeable bricks, and their strength is relatively poor. Many acquisitions were unknowing and chose this type of brick. This is also the reason why many locals are immersed in heavy rain on July 21, despite permeable bricks. "Purchasing permeable bricks can't be cheap, the use life of the cheap is short, and it must be replaced in one or two years. In fact, the cost will be higher." Li Shengyong said. "At the same time, a lot of fake and shoddy products fill the market." He showed that these products are 4 to 5 yuan / m2 cheaper than real permeable bricks. They are only made of pitted surface, but they are not actually water permeable. Often in order to earn the highest profit, fake and shoddy products are purchased to resist engineering acceptance. Therefore, when purchasing permeable bricks, we must give priority to regular manufacturers, and do not covet the cheapness for the time and make it more troublesome in the future.