The use of inferior waterproof materials has been included as an important facto

The "China construction waste resource Industry Development Report" issued by the China construction waste resource Industry technology Innovation Strategic Alliance pointed out that "with the continuous and rapid advancement of urbanization and industrialization in China, the phenomenon of garbage siege is becoming increasingly severe, of which construction waste has accounted for about 40% of urban waste."


China construction waste resource industry technology innovation strategic alliance issued the "China construction waste resource industry Development Report" pointed out that "with the continuous and rapid progress of urbanization and industrialization in China, the phenomenon of garbage siege is becoming increasingly severe, of which construction waste has accounted for about 40% of urban waste."


The report points out that while the construction waste siege crisis is becoming increasingly serious, the reasons for the production of construction waste directly point to the inevitable large-scale demolition and construction in the process of urbanization and industrialization.


However, looking at the world, most countries in the world are in the process of construction and development, "demolition" and "construction" is an inevitable part of urban development, only from the "big demolition and construction" to look at the causes of construction waste, often ignore some potential factors contained in the process of construction waste production and the result of joint action and mutual influence.
In-depth study can find that the use of inferior waterproof materials has been included in the surge of construction waste among the important factors, and even, under the influence of inferior waterproof materials, a construction waste "siege" hidden danger is being buried.


It can only be dismantled but not repaired
A mountain of construction waste has piled up
In 2014, NetEase Home in particular for the national building waterproof leakage status survey, survey results show that the housing leakage problem is not optimistic, most buildings have varying degrees of leakage, of which the floor of the top floor of the building leakage rate of up to 95%, residential housing leakage rate of 63.6%, underground space leakage rate of 57.4%.
These figures not only mean that the majority of homes across the country suffer from leaks, but also mean that repairing these leaky homes will generate a lot of construction waste.


In response to this conclusion, some people will ask why repair waterproof layer will produce a lot of construction waste? Should leaks in buildings be torn down and rebuilt rather than repaired?
Some experts explained that according to the reason, the waterproof layer should be able to achieve the purpose of waterproofing by repairing, such as the current internationally widely applicable SBS modified asphalt waterproof coil, for the leakage point through high temperature melting patching can be repaired.


But the truth is far from that simple. Experts said that the polyethylene polypropylene waterproof coil, which is widely used in China, is one of the main causes of building leakage. The coil is mainly composed of polyethylene film and polypropylene fiber, the polyethylene film plays a waterproof role in the middle, and the polypropylene fiber is attached to both sides of the polyethylene film, and plays the role of bonding with concrete, mortar, etc. Due to the water permeability of polypropylene and other problems, polyethylene polypropylene does not have the conditions to patch, therefore, once the polyethylene polypropylene is broken, the waterproof layer is leaking, it is necessary to completely remove the waterproof layer and rebuild, each demolition and repair will not only produce a lot of construction waste, the resulting national economic losses are difficult to estimate.


So, how much construction waste will be generated in the process of repairing the waterproof layer of the house?
Let's calculate an account, assuming that there is leakage on the roof of a residential building, under normal circumstances, thorough maintenance needs to remove the original waterproof layer and rebuild, that is to say, remove about 100mm of the thickness of the ceramic concrete slope, 20mm of the cement mortar leveling layer, the insulation layer, 30mm of the cement concrete leveling layer, 50mm of the concrete protective layer. Total concrete removal of 200mm. In other words, for every 1m2 of roof maintenance, about 0.2m3 of construction waste will be generated. In reality, the amount of construction waste generated is positively correlated with the thickness of the roof, the thicker the roof, the more construction waste is removed, and the removal amount of 0.2m3 per square meter is not much.


In the process of the reporter's investigation and interview, an industry expert introduced a very typical project case to the reporter: in Hefei, Anhui province, a luxury high-rise building in the construction of the use of polyethylene polypropylene material as a waterproof layer, after a period of use, the roof made of this material does not have waterproof function, serious leakage, had to completely eliminate the roof reconstruction. According to reports, the roof area is only 1000 square meters, but due to the large thickness of the roof, at least 500m3 of construction waste is generated, and because of the top floor, in order not to occupy the public elevator, aisle, reduce the impact on the bottom households, only the transportation of construction waste took 3 months, the construction process is painful.
This is only in the construction of the project, in the family decoration, due to the use of inferior waterproof materials caused by the repeated demolition and construction of waterproof layer phenomenon is even more so.


From the data point of view, the removal amount of construction waste per square meter of about 0.2m3 is not impressive at first glance, but imagine when thousands of households eliminate construction waste piled up, the amount and the consequences can not be imagined.


Poorly waterproofed buildings are short-lived
The pitfalls are endless
Carefully trace the components of construction waste can find such a problem: at present, in China, due to poor construction quality resulting in building demolition of construction waste, has become one of the important components of construction waste generation, and with the expiration of China's building life, in the next period of time, the proportion of this source will rise year by year.


According to the survey data of the relevant departments on the building life, the building life of the United States is about 74 years, the United Kingdom has reached 132 years, and the average building life of China is less than 30 years. The famous architect Wang Shu once said of Shenzhen's architecture: "I am very worried that in 50 years, it will face a particularly serious problem - it will be full of construction waste." The concrete will crumble and be useless." In fact, not 50 years, through the social news in recent years, we have seen that all over the country, "building crooked", "building falling down" and "building brittle" events have emerged in an endless flow, and the surge in construction waste caused by poor construction quality has been like a domino.


Why is BUILDING quality poor in our country? Why are buildings so short lived? Why is there such a big gap compared with European and American countries? Why does concrete "crumble"?
The reasons are many and complex, among which the widespread use of inferior waterproof materials does bear great responsibility.


As we all know, building waterproof materials are mainly used in building walls, roofs, tunnels, highways, landfills, etc., as a non-leakage connection between the engineering foundation and the building, it is the first barrier of the entire project waterproof, to ensure that the building, the engineering structure is free from water erosion, and the internal space is not damaged by water. The quality of waterproof materials and whether they are used properly directly affect the quality of waterproof projects and also have a direct impact on the service life of buildings.


However, according to the data, the current uniform cost of China's building waterproof project in the total cost of the construction project 2% or even below, while foreign countries are more than 10%, which means that in China, the project in fact, there is not enough funds to use waterproof materials, let alone good quality waterproof materials. Once a building is not waterproof, or poor quality waterproof materials lose waterproof performance, the surface of seemingly indestructible reinforced concrete will be difficult to pass the test of time, will continue to produce cracking, leakage, erosion phenomenon, a serious threat to the safety and life of the building, but also accelerate the speed of construction waste generation.


In real life, such cases are common, a bridge body in Beijing due to reinforced concrete cracking and leakage, then the bridge body alkali aggregate reaction, carbonization reaction, by the erosion of chlorine salt snowmelt agents, repeatedly through freezing and thawing damage, and finally can only be forced to be dismantled, once solid bridge can only be reduced to more than 3 billion tons of construction waste produced in our country every year.


Start with me and think about the future
To solve the garbage siege problem
Waterproof materials as an essential part of the building, if it is not because of the poor quality, backward waterproof materials in a wide range of use, resulting in building leakage, the use of building performance decline, there can be no large-scale eradication and reconstruction phenomenon, produce the original unnecessary, but also no opportunity to produce construction waste.
"Concrete is a permanent building material," said Ji Yuanzhen, a professor at Tsinghua University, in an article about the life of buildings. "As early as 2,000 years ago, natural concrete has been produced, and the Pantheon in Rome has been built for 2,000 years. If we do a good job of protecting steel bars, durability should be very good." If it were not for the use of inferior and backward waterproof products, making the concrete in the building suffer from the erosion and "destruction" of rain and groundwater, China's buildings would not be so short-lived, nor would they become the main source of construction waste surge.


From the waterproof industry, how to reduce the generation of construction waste, crack the construction waste siege dilemma, the first thing is to start from their own, eliminate poor quality, backward waterproof materials.


At the same time, we also have to see that, first, the construction waste problem is not only the use of a poor waterproof product, nor is it a problem faced by an industry in the waterproof material industry, and every move of other industries may also cause the production of construction waste; Second, the process of urbanization in our country is still accelerating, and the problem of construction waste is inevitable.


Therefore, not only the waterproof industry, but also the entire construction industry should start from the perspective of their own position and know how to "look ahead". The so-called "look after" means that the construction waste recycling industry should dispose of the generated construction waste in a recycling way, and the so-called "look forward" is what every area of the building materials industry should do. Only by reducing the "short-lived construction" caused by human factors at the source can the production of construction waste return to its reasonable frequency.


Through the elimination of backward and inferior products and other means, improve the quality of construction, extend the life of construction, and control the output of construction waste within a reasonable growth range. Only in this way, the construction waste siege crisis can be effectively resolved.