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Published: 2021-12-16 15:21 Source: China

Recently, the construction of an ordinary rural road in Bayannur City, Inner Mongolia, has caused widespread concern in the industry. The 4.2km long, 6-meter wide road took only three days to open to traffic, more than 20 days ahead of the traditional road construction, completely overturning the traditional concrete road construction model.

What is it about the new technology that makes road construction so easy and fast? Traditional raw materials are mostly of natural sand and cement road, and the road of the raw material is made from a mix of three kinds of materials, including industrial solid waste for more than ninety percent, cement seven percent to 10, the new curing agent was zero point two percent, the mixture of several kinds of material hardening speed is very fast, laid method is also very simple, the paving method is adopted, Pour the mixed materials into the ground, then use the vibration roller to flatten the road surface, two hours later use polishing machine grinding, after polishing plastic film cover maintenance, three days later, the road strength to rebound 30, you can open to traffic.

Industrial solid waste can be used so efficiently, paving speed is so fast, which is the effect of patented coagulant with independent intellectual property rights. Developed by Qingdao Grace Road Environmental Protection Co., LTD., the new coagulant is a synthetic material, light blue, that can turn all kinds of industrial solid waste into usable materials by putting just 2 kilograms into a ton of material. China building materials science research institute has for this kind of curing agent was analyzed, and found that the composition such as sodium chloride, citric acid in the curing agent can stimulate the activity of catalytic material substance, can balance the particle surface charge of the raw materials, and confirm that it is a comprehensive behavior, both the physical, and chemical adsorption reaction, which has excellent bonding strength and stability. And solved the problem of freezing and thawing in northern areas, with good durability.

The coagulants developed by Qingdao Grace Road have obtained domestic and foreign patents and won many provincial and municipal government awards.

China produces more than 4 billion tons of solid waste every year, which occupies land and pollutes the environment. The central government has made important instructions and work arrangements on many occasions, pointing out that it is necessary to "adhere to green development, promote the reduction of solid waste, the recovery of resources, and the harmless, efficient utilization, energy saving and consumption reduction, and realize the transformation of waste into treasure and harm into benefit".

Road construction by combination of new coagulant and industrial solid waste has opened a new road for environmental protection and construction market. The 4.2km road consumed more than 10,600 tonnes of solid waste. Compared with the traditional road construction method, it can save more than 400 tons of cement and 10,000 tons of sand and stone, and reduce carbon emissions by more than 2,000 tons in total.

This model can be said to kill multiple birds with one stone. One is to turn "solid waste" into treasure and turn harm into benefit. Second, the use of solid waste road saving a lot of cement, sand and gravel, correspondingly reduce carbon emissions; Third, the road maintenance process is simple, the traffic speed is fast, saving the time cost, for national defense, emergency work is of great significance; Fourth, the economic cost is reduced, the price of industrial solid waste is much lower than the price of cement. Small coagulants bring many benefits, experts on the scene to say their feelings.

Cui Yuansheng, deputy director and chief expert of the National Institute of Building Materials Technology information, gave affirmation and support to this technology.

"The world is in the research on this technology, the 13th world conference on cement, President of the Spanish angel professor has been in the study, but has not yet been applied to road construction, road of the grace of this technology is leading in the world, domestic research on alkali excitation, research of Portland cement has, but the combination of these two also have no, he is a alone here, We dare to support the positive application of this new technology."

Ren Qiyong, director of the Building Energy-saving Technology Promotion Committee of the China Building Energy Conservation Association, said: "As far as I know, their technology is the latest in the utilization of solid waste, and the utilization rate of solid waste is the highest in China."

Yuan Quan, director of the Engineering Structure Laboratory at Beijing Jiaotong University, also spoke highly of this technology:

"Industrial solid waste is a misplaced" resource ". Under the guidance of the national goal of "carbon peak and carbon neutralization", the resource utilization of solid waste is of great significance. The quality indicators of semi-rigid roads built by Grace Road coagulant technology are better than those built by traditional concrete, leading the country. This project has an important demonstration role in green development and carbon emission reduction." (Chen Dongyun)

Responsible editor: Chen Weijie