Preparation and Performance Study of Low Temperature Steel Reinforcement Sleeve Grouting Material
In response to the problems of low or no early strength and insufficient expansion rate of sleeve grouting materi-al in low-temperature environments,the paper develops a low-temperature type sleeve grouting material with early strength,high strength,and slight expansion through the formulation of various additives and the optimi-zation of each component,and studies its performance at low temperatures.the results show that negative tem-perature curing can delay the strength growth of grouting materials;the low-temperature sleeve grouting mate-rial with composite fast hardening cement,retarder,type Ⅱ expansion agent,early strength agent,and anti-freeze agent meets the compressive strength requirements of JG/T 408-2019"Sleeve Grouting Material for Reinforcement Connection"under negative temperature curing conditions in this test;as the temperature of the mixing water increases,the 1 day compressive strength under negative temperature curing conditions in-creases,but it has no effect on the strength at 3 and 28 days.
low-temperaturesteel bar sleeve grouting materialadmixturescompressive strength
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