Anchorage Property of Cement-Based Adhesive Anchor with Frost Resist Acceleration for Cold Weather Construction
By Y. Takase, T. Abe, G. Orita and S. Ando
Concrete Journal, Vol.60, No.6, Jun. 2022
- Synopsis
- This study investigates whether the addition of lithium nitrite (LiNO2) to cement-based adhesive used for postinstalled anchors can fix anchors properly even at sub-zero temperatures. Anchor bars were fixed into concrete using this adhesive and cured in a thermo-hygrostat chamber at -5℃ to verify the bond strength. The LiNO2 concentration of 14.3% was found to give good performance in terms of compressive strength of the adhesive and bond strength of the anchor bars. Next, using adhesive containing LiNO2, anchor bars were fixed outdoors in winter in Hokkaido, and anchor bar bond strength and shear strength tests were carried out. The anchor bars exhibited good bond strength and shear strength even when the adhesive was cured without warming in a cold environment with average temperatures of -10℃ and -5℃ to -7℃ on the day of anchor fixing and 7 days after anchor fixing, respectively.
- Keywords:
- Seismic retrofit, Post-installed anchor, Cement-based adhesive, Cold weather construction
