Based on GB T50448-2008 "Technical Specification for the Application of Cement-based Grouting Materials", the grouting materials are divided into four categories according to their fluidity
The initial value of the specified fluidity of Class I grout is 380mm
The initial value of the specified fluidity of the similar grout is 340mm
The initial value of the specified fluidity of the similar grout is 300mm
The initial value of the specified fluidity of Class IV grout is 270mm
Fluidity means the degree of concrete slump, which must be tested with professional and accurate measuring equipment. The compressive strength is 20MPa for one day, 40MPa for three days, and 60MPa for 28 days.
According to the provisions of GB T50448-2008 "Technical Specification for the Application of Cement-based Grouting Materials", grouts are divided into four categories, with fluidity as the classification standard. Specifically, the initial flow value of Class I grout is specified as 380 mm, Class Type Grouting is specified as 340 mm, Class Type Grouting is specified as 300 mm, and Class IV grout is specified as 270 mm. The degree of fluidity referred to here is actually the collapse of the concrete, which needs to be tested using specialized and accurate measuring equipment.
In addition to fluidity, compressive strength is also an important indicator of grout. According to the specification, the grout should reach a compressive strength of 20MPa in one day, 40MPa in three days, and more than 60MPa in 28 days. These indicators are all to ensure the stability and reliability of the grout in practical applications.
When selecting and using grout, key indicators such as fluidity and compressive strength should be fully considered. For different engineering needs and environmental conditions, the corresponding category of grouting material should be selected, and the construction and testing should be carried out in strict accordance with the specifications to ensure the quality and safety of the project.