In the industrial chain, concrete is the closest industry to cement.

Considering that cement-based precast parts are widely used in the peripheral protection, precast floor slab and precast decoration of precast steel structure buildings, if we can comprehensively consider the carbon emission from the perspective of the whole life cycle of buildings from the design, production, installation and construction to operation and maintenance of precast concrete components and interior parts, it will undoubtedly help precast buildings play a greater role in carbon emission reduction.

At the same time, they have good functions of waste utilization and emission reduction, and show good characteristics of material saving, energy saving and low carbon in the product itself and the whole life cycle of project construction.

In the production of precast concrete components, we should actively promote new technologies of automation, informatization and intelligence, build a smart factory, and reduce carbon emissions through material saving, energy saving and labor saving.

Flat Feed Anchor

In the world, in addition to the coal power and steel industries, the cement industry has the largest carbon dioxide emission in the production process.

On October 26, the State Council issued the action plan for carbon peak by 2030 (hereinafter referred to as the action plan).

The “long line desktop stirrup welding robot” developed by Beijing Yantong company can improve the production efficiency by three times, save 75% labor, 15.5% reinforcement and 48% energy saving rate; The total power of reinforcement welding mesh robot is 1 / 2 ~ 2 / 3 of that of similar equipment, and the energy saving rate is 33%; Large wallboard formwork erection production line can save energy by more than 45%; PCIs system saves more than 10 management personnel per factory.

Cement has become one of the largest carbon emission sources in China.

The so-called “low-carbon concrete” technology refers to the relevant concrete technology that can directly or indirectly reduce greenhouse gas emissions in the process of concrete production and use, including the green high-performance concrete technology and tailings The application technology of solid waste renewable resources such as construction waste in concrete engineering has the most direct effect to reduce the carbon emission in concrete application and the amount of cement in concrete.

On the basis of promoting the application of various decorative calcium silicate boards in the surface layer, research and develop cement-based basic components to help reduce the carbon emission of cast decoration..

Taking the longitudinal rib laminated concrete shear wall structure system as an example, the iterative upgrading of sleeve grouting shear wall structure system and double-sided laminated shear wall structure system is realized.

Almost all the production capacity and output of cement need to be undertaken and transformed into products or parts.

In recent years, precast buildings have developed rapidly.

In terms of function, they can also directly or indirectly reduce carbon and carbon.

Data show that China is the largest country of cement in the world, with an annual output of more than 2.2 billion tons for several consecutive years.

At present, the energy consumption limit per unit product of Beijing Tianjin Hebei precast component factory is 55kgce / m ³， The energy consumption limit per unit product in the maintenance link reaches 45kgce / m ³， The advanced value of energy consumption per unit product is 30kgce / m ³ And 25kgce / M ³ There is still a lot of energy-saving space.

The concept of “low carbon concrete” appeared in the heavy document issued by the State Council for the first time.

For example, photovoltaic building integrated roof products and photovoltaic wallboard products with decoration.

Compared with the traditional external wall external thermal insulation process, the replacement of thermal insulation materials can be exempted for 1-2 times in the whole life cycle of 50 ~ 70 years.

It has the characteristics of high degree of automatic production, easy control of the connection quality of stressed reinforcement, fast construction speed and low comprehensive cost.

The anti striking porcelain plate and ceramic tile finish can be maintenance free, and the long-term fair faced concrete finish can also avoid the refresh of traditional coatings every 5 ~ 10 years.

The definition of “low-carbon concrete” should be based on whether the whole life cycle of project construction can play a role in reducing carbon.

3.

In the chapter of “promoting the carbon peak of building materials industry” in the action plan, the requirements of “strengthening the R & D and application of low-carbon building materials products such as new cementitious materials, low-carbon concrete and wood bamboo building materials” are prominently appeared.

Based on the characteristics of industrialized production of precast building parts, this paper puts forward an effective path of carbon emission reduction worthy of vigorous promotion: 1.

In 2020, 630 million square meters of precast buildings will be newly started in China, an increase of 50% over 2019, accounting for about 20.5% of the new building area, including 430 million square meters of precast concrete structure, accounting for 68.3%.

As we all know, the most popular explanation of the so-called “low carbon” is to reduce carbon dioxide emissions.

In terms of precast building design, it is necessary to establish the concept of full life cycle material saving, which is not only to reduce carbon emission, actively adopt a new main structure system conducive to low-carbon development, and actively promote precast parts conducive to improving building energy efficiency.

Precast concrete products are produced by factory automatic assembly line, which greatly improves the production efficiency and reduces the process energy consumption.

Every 5 million square meters of new houses can reduce nearly 400000 tons of rock wool material waste in the operation and maintenance stage.

In terms of R & D of new precast parts, first, we should actively promote the application of renewable energy buildings, improve the “production capacity” of buildings, and develop green energy heating technology.

2.

Material saving, maintenance free and low-carbon effect is obvious in the whole life cycle.

This means that “low carbon concrete” will become an important engine and promoter of the building materials industry in the historical process promoted by the national “double carbon”, bearing and pinning the expectation and hope of low-carbon development of the whole industry.

Second, we should actively develop cement-based precast decoration parts suitable for dry operation.

Under 75% of the building energy-saving standards in Beijing, the use of “structural thermal insulation and decoration integrated exterior wall panel (commonly known as sandwich exterior wall panel)” can achieve the same service life of thermal insulation materials and facade decoration materials with buildings, improve building thermal insulation performance and energy utilization efficiency, and reduce building operation energy consumption.