Research on Low Temperature and Early Strength of Cementitious Grout for Sleeve Coupler of Reinforcement Splicing

摘要

Ordinary cementitious grout for sleeve coupler of reinforcement splicing cannot be applied normally when the temperature is below 5℃. In this paper, a new type of sleeve cementitious grout with sulphoaluminate cement as the main binding material used in the negative temperature is developed. Besides, the effects of polycarboxylate water-reducing agents, thixotropic agents, superfine beads, plastic expansion agents and antifreeze components on the performance of grouting materials are also studied. The results show that the sleeve cementitious grout studied has good rheological properties and strong ability to resist frost. The compressive strength can still develop even in the environment of -10 ℃, and there is no special construction technology required. This reduces significantly the difficulty of the construction of prefabricated building connection in low temperature environment.