Slag powder is also called granulated blast furnace slag powder. Its particle surface is smooth and compact. It is mainly composed of CaO, MgO, SiO2 and Al2O3. It accounts for more than 95% of the total slag powder and has high potential activity. Under the action of hydration, it can be combined with hydration to form a hydraulically hardened cementitious material. Slag powder has less adsorption of water and additives, and has a certain physical water reducing effect. Generally, it can reduce the water consumption of concrete by about 5%, and can replace P·O42.5 cement by 15% to 30%. Mixing it into cement and mixing concrete can increase the slump of concrete, reduce the loss of concrete slump, and can significantly improve the fluidity of concrete. It is a high-quality concrete admixture, and it is also green and healthy. New building materials products.

Generally, the finer the slag is ground, the higher its activity, and the greater the hydrothermalization generated in the early stage after mixing into concrete. The slag is not formed by the combustion of fuel, and the slag powder basically contains no carbon, so the color of the slag powder is usually white. In the standard requirements of "Granulated Blast Furnace Slag Powder Used for Cement and Concrete", the density of ground slag powder used for cement and concrete shall not be less than 2.8g/cm3.

With the good application prospects of granulated blast furnace slag powder, how to select high-quality and pure slag powder products has become a hot spot for everyone. At this time, the most direct and effective way is to use a third-party certification agency to endorse its quality credit, namely: slag powder product certification.

The slag powder product certification process can be roughly divided into three parts: initial factory inspection, product sampling inspection, and post-certification supervision. The certification cycle is usually 90 days. During the certification process, the certification applicants are not qualified due to product inspections and factory inspections. The time that causes the extension is not counted in the certification time limit. Organizations that are to obtain product certification from third-party organizations can use certification marks in appropriate locations on certified products or their smallest outer packaging during the validity period of the certification.

The slag powder product certification is divided into different quality grades in accordance with the "Quality Grade Evaluation of Granulated Blast Furnace Slag Powder Used in Cement and Concrete". Based on the principle of fairness and justice, the comprehensive assessment of the slag powder quality grade is carried out by a third-party certification body in accordance with the state The prescribed standards shall be used to evaluate the applicant enterprises. The new standard is based on the original three categories of slag powder products: S105, S95 and S75. Each category of products is divided into superior products and qualified products. As a functional material product that plays an increasingly important role in national key projects, the formulation of the new standard for slag powder can be said to meet the requirements for excellence in product quality. Among them, the superiority of product quality is directly related to factors such as the supply of raw materials, equipment performance, production management level, and quality control level. Such potential factors are difficult for consumers to see from the nature of the product.

In today's market development situation, the competition among enterprises is becoming more and more fierce, and trust is the inherent demand of the economy and society. In view of the unobvious characteristics of product quality in the slag powder industry, in order to better show its strength to customers, certification is an inevitable choice for enterprises in the slag powder industry.

Source: National Materials Certification