Concrete recycling technique utilizes large quantities of industrial and construction waste during concrete production, such as concrete aggregate, mechanism sand, steel slag powder, FGD gypsum and fly ash, to replace 30%-50% gravel, river sand and cement. Tongji University and STEC started to develop the technique since 2006. During 2010 World Expo, recycled concrete was applied to the Shanghai Eco House in the UBPA, in co-operation with Shanghai Research Institute of Building Sciences Group. This project ranked top in the domestic construction and was close to the international standard. The technique was given the Shanghai Resource Comprehensive Utilizing Prize in 2011, and Shanghai Science and Technology Progress Award in 2013. The application of the concrete recycling technique established a high-efficient method to deal with mass industrial and construction waste with low energy consumption. This helps the city turn the waste into precious mineral resources.

Currently, STEC sets its own recycling aggregate production line and construction waste consumption spot to deal with the waste on site in large demolishing projects, or collect and handle the waste together for small-and-medium demolishing projects. Through establishing a city construction waste information cloud platform, we strive to build an industry chain cycle, synthesize collecting of concrete waste, producing and processing recycling aggregate, and green recycling concrete as one application.

Fair-faced concrete serves as a kind of artistic expression technique for modernism in architecture. The fair-faced concrete adopts the natural color of cast-in-place concrete as finish. Its simple, natural and stable appearance delivers an generous and inclusive atmosphere and an eclectic unique artistic beauty. Simultaneously, it needs a cast-in-place molding and achieves the unified difference in color, the smooth surface, the homogeneous bubble and the clear texture. After casting, there is no need for any painting, tile, stone and other processes. In this way, the material shows the plain color decoration effect of concretes "returning to simplicity". This material also embodies the concept of environmental protection because it reduces the surface decoration materials, saves the chemical products, such as coating and finish, and lowers a large amount of construction dust and waste.

The anti-floating counterweight concrete with low-carbon steel slag researched and developed by STEC Shanghai Urban Construction Materials Co., Ltd. is kind of heavy concrete with high specific gravity. It takes the high-quality steel slag as raw material and goes through composite preparation. It is 1.5 times heavier than ordinary concrete and therefore can effectively solve the problems of structural anti-floating counterweight and building balance counterweight due to the lack of structural deadweight in soft soil foundation engineering. 

Foamed concrete is named as "one of the most functional bulk inorganic lightweight materials so far". It is a new kind of porous lightweight concrete material formed by physical foaming method. It lightens the previously heavy concrete and endows concrete with dozens of functions, such as heat preservation, thermal insulation, sound absorption, fire resistance, waterproof, shock wave resistance, electromagnetic wave resistance, air permeability and corrosion resistance. Due to its lightweight, foam concrete can reasonably reduce the load and compensate the free settlement difference after its utilization for backfilling in construction and geotechnical engineering. After its utilization in wall surfaces, foam concrete can not only keep ambient environment warm in winter and cool in summer, but also solve the problems of falling off, fire prevention and durability in traditional external wall insulation materials once and for all.

Desulfurization gypsum plaster mortar consists of mineral admixture, gypsum, glass beads, fine aggregate, water retaining agent, retarder, and other additives. It’s powder material mixed in a factory in certain proportion. The product has a good anti-crack protection effect, high cohesional strength, and good water retention. The product meets the Shanghai local standard of "Desulfurization Gypsum Plastering Mortar Application Regulations”. It’s the ideal and new green environmental-protection material for building’s interior wall leveling treatment, which can ensure a smooth wall, and prevent the wall from cracking and hollowing. The product has been successfully applied to the Pujiang Ruihe City Project, and Vanke Projects in Shanghai, Jiaxing, Ningbo, Suzhou, Wuxi, and Xuzhou. The construction area reached millions of square meters. The project was ratified by most clients, owners and contractors.

At present, we have a gypsum plaster mortar professional construction team of more than 650 people, equipped with professional construction management, quality management, safety management, and also 32 sets of German imported pulp shooting machines, which can fulfill the requirements of 8 to 10 large projects at the same time.