高强钢筋连接用套筒灌浆料的试验研究

Abstract

Building industrialization is the development trend of China's construction industry, prefabricated concrete structure with steel sleeve grouting connecting node is connected, hence, the technical performance of steel sleeve grouting material to secure mass assembly structure has a decisive role. Steel sleeve grouting material is a cement-based grout, cement and other cementitious materials as the base material, adding a certain amount of fine aggregate and additives mixed composite material, add water and stir evenly mixing after having very good performance, but also has a micro-expansion, early strength and other characteristics, grouting sleeve used in prefabricated concrete structures connecting joint, its role is to be achieved by connecting the reinforced connection between the walls, making the structure as a whole, Therefore, the quality of steel sleeve grouting material is essential.

In this paper, P?Ⅱ52.5 and P?O42.5 two different strength grades of cement varieties, with a variety of admixtures, adding plastic expansion agent and hardening expansion agent in the grouting material at all stages have a good expansion rate The In this study, a large number of experimental design work, through the grouting material of the raw materials and mix of indicators of comparative analysis, the impact of grouting material on the main technical performance of the factors; The optimum mix design, preparation of the grouting material for the main technical performance: initial fluidity and 30min retention value of 370mm and 340mm; 1d, 3d, 28d compressive strength were 43.8MPa, 73.6MPa, 118.1MPa; 3h, 24h-3h expansion rate were 0.32, 0.18. Expected in the national building materials testing center for testing, the indicators are to meet the standard requirements, product qualified. Through the optimization of the mix design, the preparation of the 28d compressive strength of more than 120MPa and other excellent technical performance of ultra-high strength steel sleeve grouting material can be used for diameter greater than 25mm and HRB500 steel sleeve grouting material connection joints; use the best mix ratio Preparation of the steel sleeve grouting grouting material combined with the steel sleeve made of connecting joints, and in the national inspection center for the type of inspection work, type inspection, including joint tensile test, large deformation repeatedly press and high stress repeated tensile test, the test results Meet the standard requirements, indicating that the grouting material developed in this article not only meet the standard requirements, but also to meet the

requirements of engineering applications. Through the economic analysis of grouting material, the cost of grouting material developed in this paper is only 1/2 of the other products of the market, and it has strong market competitiveness.

Keywords: reinforced sleeve, filling materials, liquidity, vertical expansion, compressive strength