Affected by the COVID-19, the speed of work in various industries in China slowed down in the first half of 2020. Generally speaking, the hot issues in the industry are concentrated in the following aspects: First, pay attention to the follow-up impact on the industry after the implementation of the new cement standard; Second, the improvement of concrete engineering quality urgently requires the formation of a more effective standard structure system in the field of cement concrete, and it is also necessary to strengthen the interaction, communication and connection between production and application; Third, with the strengthening of environmental protection and the country's guidance on green consumption, the green building materials industry guided by macro policies such as solid waste resource utilization and waste-free city is developing rapidly. 

The quality control and management of concrete engineering, special concrete, high performance concrete, ultra-high performance concrete, green concrete and green production, solid waste resources, new concrete technology, new standard and engineering application are still hot but difficult points in the field of concrete engineering. The branch will closely track the development trend of concrete technology, pay attention to the hot spots and difficulties in the field of concrete in time and master the demand of concrete technology development.

1. Development status of concrete technology

1.1 The green production and informatization of ready-mixed concrete have been further promoted and improved 

With the technical progress and the guidance of industrial policies, the traditional concrete production technology and management methods have been further optimized, and the totally enclosed production technology with the goal of zero discharge of three wastes, dust reduction and noise reduction, and harmless production of concrete is gradually rolling out throughout the country. Except in some provinces and cities in East China and South China in previous years, some provinces and cities in the Central of China have started to implement green production and management technology of ready-mixed concrete, and encouraged the implementation of green production evaluation and marking system of ready-mixed concrete. Some cities tried to support local policies to guide and require the assessment of star-rated ratio of green production of mixing plants. As equipment manufacturing and information technology develops, large-scale concrete enterprises in some areas have begun to focus on upgrading the concrete industry, upgrading the concrete production line and management platform. Individual leading enterprises have successfully upgraded according to the corresponding national intelligent manufacturing and information policies and the corresponding upgrading technology has begun to show advantages in the daily production and management of enterprises. 

1.2 New technology in construction industry is developing rapidly

After a great deal of engineering practice, China’s independent innovation ability of engineering technology has been continuously enhanced, the construction technology has been approaching to the international advanced level, making outstanding achievements in building energy conservation and green building, and informatization in the construction industry has been steadily improved overall.

1.3 Accelerate the development and application of high-performance concrete and special concrete related technologies and products

The year of 2020 witnessed the whole country continue to attach importance to the development of high-performance concrete technology and application. Guided by realizing energy conservation and emission reduction in the construction field and promoting industrial upgrading, we adhered to the basic policy of government guidance and market promotion. Some provinces and cities formulated tailored development routes and policies, focusing on government investment and construction projects using financial funds, and giving priority to the use of high-performance concrete and new concrete technologies in green buildings, green ecological urban areas, affordable housing, municipal infrastructure and large public buildings and other constructions. 

1.4 Macro policies have further strengthened the guiding role of green industries 

In terms of disposal of construction waste resource, China is vigorously promoting the construction of a "waste-free city", promoting the source reduction and resource utilization of solid waste, exploring the establishment of relevant index systems, systematically summarizing the pilot experience, and forming a replicable and scalable construction model; Economically developed cities and regions are also  promoting the safe disposal and comprehensive utilization of construction waste, gradually promoting the utilization of recycled construction waste products, and strengthening the disposal of construction waste through new technologies to realize the whole process supervision.

2. Standardization work related to concrete engineering

2.1 Compilation of full-text mandatory standards in construction field

In 2019, the Ministry of Housing and Urban-Rural Development issued relative documents again: in accordance with the requirements of the Opinions of the Ministry of Housing and Urban-Rural Development on Deepening the Reform of Standardization of Engineering Construction (GB [2016] No.166) on the construction of China's full-text mandatory engineering construction specifications (hereinafter referred to as engineering specifications), the Ministry of Housing and Urban-Rural Development organized several units to compile engineering specifications. According to the international common practice, the engineering specifications will replace the existing mandatory provisions after being issued, and serve as the basic requirements for binding the recommended standards and group standards. In 2020, some engineering codes passed the examination and were issued and implemented one after another, which once again provided strong technical support for the guarantee of engineering quality and strengthened the importance of engineering codes in the engineering field.

2.2 Group standards have developed rapidly 

With the reform and improvement of the national standard system, the constant updating and release of group standards such as association standards and society standards have further improved the concrete standardization system. Group standards should not only complement the national standards, but also reflect the advancement of standards, and promote the progress of industry technology and the improvement of engineering quality. 

2.3 Updating related standards and putting forward advanced standards

The standards for raw materials such as high-performance cement, aggregate for high-performance concrete, functional composite admixture, and advanced durability test methods have been reviewed successively. These standards will provide standard basis for enterprises to improve their production technology, guide the production of high-quality raw materials by insisting on standard guidance, and provide important standard basis and premise guarantee for the popularization and application of high-performance concrete.

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