自密实钢纤维轻骨料混凝土的早期性能与损伤分析

摘要

在自密实轻骨料混凝土基础之上掺入钢纤维配制出自密实钢纤维轻骨料混凝土,分析了自密实钢纤维轻骨料混凝土的抗压强度、抗拉强度等主要力学性能以及收缩、抗碳化等耐久性能,并与普通骨料自密实混凝土进行对比分析.探讨了钢纤维对于改善自密实轻骨料混凝土损伤所起的作用及其机理.结果表明:掺入钢纤维后自密实轻骨料混凝土的抗压强度增大,劈拉强度明显提高,收缩及抗碳化能力也有明显改善.与普通骨料混凝土相比,自密实钢纤维轻骨料混凝土初始裂缝的产生与发展得到有效抑制.%In this paper,we successfully prepared a self-compacting,steel-fiber-reinforced lightweight aggregate concrete on the basis of self-compacting lightweight aggregate concrete and steel fibers reinforcements.A comparative study was carried out on the mechanical properties and durabilities (compressive strength,tensile strength,shrinkage,carbonization resistance,etc.) between the self-compacting steel-fiber-reinforced lightweight aggregate concrete and self-compacting concrete with ordinary aggregate.The function and mechanism of steel fiber in improving the damage of self-compacting lightweight aggregate concrete were discussed.The results showed that the addition of steel fibers lead to an increase of compressive strength and a significant rise of splitting tensile strength for lightweight aggregate concrete,as well as obvious improvements for both shrinkage and carbonation resistance.Compared with ordinary aggregate concrete,the emergence and propagation of primary cracks of the self-compacting steel-fiber-reinforced lightweight aggregate concrete can be effectively inhibited.