摘要
Abstract
Concrete,widely used in rail transit station engineering,is susceptible to cracking during the molding and curing processes due to factors such as autogenous shrinkage and temperature differences.These cracks can affect the structural performance.To enhance the crack resistance of concrete,this study investigates the effects of UEA expansion agent and rice husk ash on the mechanical properties and crack resistance of concrete.The results show that the dual admixture of UEA expansion agent and rice husk ash reduces the workability of concrete,requiring an appropriate addition of a water reducer to maintain good flowability.The dual admixture has a limited effect on the compressive strength of concrete;the strength of the C-UEA5-RHA5 group increased by approximately 8.6%compared to the control group,while the strength of the C-UEA5-RHA8 group slightly decreased by about 3.5%.Moreover,the dual admixture significantly improved the crack resistance of the concrete.In the C-UEA5-RHA8 group,the width,length,and number of cracks were significantly smaller than in the control group,and the crack development was effectively controlled.关键词
膨胀剂/稻壳灰/力学性能/抗裂性能Key words
Expansion agent/Rice husk ash/Mechanical properties/Resistance to cracking分类
建筑与水利
