This project belongs to the field of environmental science and technology.
At present, the annual production of industrial by-product gypsum, dredged sediment and construction waste (excluding muck) in Shanghai reaches 30 million tons, and environmental constraints continue to increase. On the other hand, Shanghai uses 15 million cubic meters of building envelope materials every year, which has the potential to consume a large amount of solid waste. However, industrial by-product gypsum "consumes high energy and has poor water resistance" for pretreatment; dredged sediment "has high moisture content and poor safety"; and construction waste "has" complex components and unstable quality ", etc., which limits its use in building envelope materials. Application. In response to the above problems, this project systematically carries out technical research on the use of industrial by-product gypsum, dredged sediment, and construction waste as enclosure materials, promotes the resource utilization of industrial by-product gypsum, dredged sediment, and construction waste, and achieves many innovative results.

1. China took the lead in proposing a theoretical system of non-calcination technology and high water resistance technology based on low-temperature activation of industrial by-product gypsum, which overcame the technical obstacles of high energy consumption and poor water resistance of gypsum-based cementitious materials; developed for the first time a high water resistance gypsum composite cementitious material (Patent No.: ZL201310295907.0) and moisture-proof gypsum mortar, the solid waste content reaches 80%, the absolute dry compressive strength is increased by 90%, and the softening coefficient is increased by 2%.~3 times, the first domestic 100,000 tons/year moisture-proof gypsum mortar production line has been established.
2. Develop high-quality flocculants to achieve a 67% volume reduction of dredged sediment with a water content of 89%. The supernatant after concentration, dehydration and separation meets the requirements of the standard (CJ343 -2010); innovatively develop dredged sediment containment structure material (Patent No.: ZL2005200466281), its sediment content reaches 60%, and the leaching amount of heavy metals is more than 98% lower than the national standard (GB5085.3 -2007) limit value.
3. China takes the lead in constructing the application technology system of construction waste recycling, and develops three domestic leading and international advanced technologies: construction waste-sludge autoclaved lime sand brick preparation technology (application number: CN201610153749.9), and the replacement of natural resources by waste is increased from 30% to 40%.~100%;100% replacement of Class II fly ash construction waste powder admixture (patent number: ZL201310454732.3); construction waste content of 40% of low consumption commercial mortar preparation technology.
4. For the first time in China, the characteristic pollution factors of industrial by-product gypsum and dredged sediment have been determined, the durability impact mechanism of enclosure structure materials with large amounts of solid waste mixed in complex erosion environments has been proposed, and the safety and durability of enclosure structure materials based on the characteristic pollution factors of solid waste have been established. Evaluation method. Develop a fire-proof, moisture-proof, energy-saving and material-saving envelope structure system suitable for hot summer and cold winter areas. The fire resistance performance is A1, the volume water absorption rate is less than 10%, the air conditioning energy consumption is reduced by 3%, and the solid waste content reaches 80%.
   This project has applied for 7 patents (3 authorizations), published 1 monograph and 19 papers, and compiled 6 product standards and specifications, including 4 editor-in-chief standards. The results of this project have been highly praised by authoritative organizations such as China Building Block Association and Municipal Resources Comprehensive Utilization Association, and the technical level has reached the international advanced level.
   This project solves the technical problems of resource utilization of industrial by-product gypsum, dredged sediment, and construction waste in building envelope materials, and promotes the greening and functional energy level improvement of the envelope structure system. The results have been widely used in major projects such as Shanghai Center, Shanghai International Exhibition Center, and Hongqiao Business District, with an application area of 19 million m2. They have also been promoted and applied to projects such as Hangzhou Green City and Ningbo Dongqian Lake Donghai Yingtai. The application scope covers the eastern coast of my country. In coastal areas, it also provides technical services to more than 10 material production and engineering construction companies.
   This project has significant economic and social benefits. In the past three years, the cumulative new output value has been approximately 436 million yuan, new profits and taxes have been approximately 61 million yuan, and 345,000 tons of industrial by-product gypsum have been utilized, 245,000 tons of dredged sediment, 550,000 tons of construction waste have been dredged, and 40,000 tons of standard coal have been saved., reduced by 300,000 tons of CO2, reduced land occupation by 285 acres, saved 193,000 tons of clay, and protected 103 acres of cultivated land (calculated based on the excavation depth of 2 meters)