Research on Preparation Technology and Properties of Grouting Materials for Prefabricated Buildings

Sleeve grouting materials are important to connect steel bars in prefabricated buildings since their quality and properties not only affect the stability, safety, and seismic capacity of buildings but also influence the operation of buildings. Quality issues in grouting materials can potentially result in joint damage and embrittlement, which may compromise the safety and service life of buildings, thereby leading to an increase in maintenance costs. Consequently, appropriate grouting materials should be carefully selected according to the operational characteristics of the buildings. This study conducted experiments to analyze the properties of grouting materials under different cement-sand ratios, with the cement-sand ratio of 1.0 selected as the base grout of grouting material. Subsequently, the orthogonal test method was employed to investigate the correlations between the properties of grouting materials and varying amounts of water reducers, expansion agents, and silica fume. Through this analysis, the optimal mixing amounts were determined as 15.7 g, 1.2 g, and 42 g for water reducers, expansion agents, and silica fume, respectivelys. Finally, based on the foregoing conclusions, a high-performance sleeve grouting material with a 3 h compressive strength of 40 MPa was successfully developed by adding sulphoaluminate and lithium carbonate. This study provides some references for the production and application of sleeve grouting materials.