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The Research of Pre-stressed Duct Grouting Doped Calcium Nitrite to Improve Slurry Performance

Xiong Huizhong1,Zhang Liguang1,Tian Qingwen2(1.Institute of Engineering Consultation and Design,Northeast Forestry University,Harbin 150040; 2.College of Civil Engineering,Northeast Forestry University,Harbin 150040)  
In the construction of pre-stressed concrete bridge,the free water in pre-stressed duct because of duct grouting technology or cement mortar mixture ratio usually creates heave and dehiscence along the passageway direction.The existence of crack can increase the concrete permeability,cause the corrosion of steel bar,and affect the structure durability.Thus,the service life of many bridges cannot achieve the design-age limit.Non-compact of grouting in pre-stressed concrete bridge duct and bleeding is one of the important factors which affecting the structure of the ultimate bearing capacity and durability of the structure.Prevent cement slurry bleeding,optimization of mix proportion is important task of our test personnel.This article unifies Fujin to the suibin Songhua River road bridge engineering construction reality,introduced mixes the calcium nitrite in the cement mortar to optimize the hydromass.By alternate freezing and long-term frozen tests,came to the conclusion:Elimination of free water in the duct and promote slurry early setting,early strength is one of the ways of improving frost resistance.
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