寒区桥梁用自密实混凝土试验研究

Experimental Research on the Property of Self-compacting Concrete of Bridge in Cold Region

通过对自密实混凝土进行快冻法和3%NaCI溶液的冻融循环试验,测定不同冻融循环次数后的质量损失率和相对动弹模量及其变化特点以及冻融损伤对氯离子扩散能力的影响。结果表明:自密实混凝土随着冻融次数的增加,其表观质量、力学性能均呈现不同下降趋势。可为寒区桥梁工程设计、养护及寿命预测提供依据。

Through the cycling test of the self-compacting concrete with the methods of quick freezing and then freeze-thaw with 3% NaCl solution,the mass loss rate,the relative dynamic elastic modulus together with its changing features,and the impact of freeze-thaw damage to the Cl^＋ diffusion were all measured under different times of freeze-thaw cycling.The results showed that,with the increase of freeze-thaw times,the apparent mass and the mechanical properties of the self-compacting concrete all declined in different velocity.The research may provide as a reference for the design,maintenance and life prediction of bridge engineering in cold region.