In recent years, the prestressed concrete pile industry in China has developed rapidly. Prestressed high-strength concrete pipe piles (PHC pipe piles) and prestressed hollow concrete hollow piles have been used in Guangdong, Zhejiang, and Jiangsu provinces. According to incomplete statistics, there are more than 500 production enterprises in the country, and the annual output is about 320 million meters. Especially for prestressed concrete piles, it has become the largest new-type pile foundation material. In Zhejiang Province, there are more than 150 companies that produce this product, with an annual output value of 15 billion yuan, of which more than 60 are in the Jiaxing region.
 At present, the development of PHC pipe piles is still very large and the market prospects are promising. However, due to the large amount of high-quality cement it consumes in production, it also brings problems such as high cost and high energy consumption. In order to promote technological progress and reduce production costs, more and more companies began to use the technology of replacing some of the cement with silica sand powder in the production of PHC piles, and replaced the cement with 30% of the same amount of siliceous sand, achieving a better economy. benefit. However, this is incompatible with the fact that there is no standard and technical specification regarding the specific use of pre-stressed high-strength concrete piles for silica sand powder, which brings certain difficulties to the use and promotion of silica sand powder.
In order to give full play to the technological superiority of the testing institutions, Jiaxing Quality Inspection Institute takes the “Thousands of Enterprises in Technical Institutions to Help” activity as an entry point, and actively cooperates with the Jiaxing Institute of Pipe Pile Applied Technology Institute to participate in the preparation of “silica sand for prestressed high-strength concrete piles”. The two industry standards for "Powder Technical Regulations" and "Prestressed Centr