硅酸盐通报2024，Vol.43Issue(4)：1445-1454,10.
粉煤灰掺量对全再生自密实混凝土工作性能与力学性能的影响
Effect of Fly Ash Content on Workability and Mechanical Properties of Fully Recycled Self-Compacting Concrete
摘要
Abstract
In this paper,recycled coarse aggregate was used to replace natural coarse aggregate,and fly ash was used to replace 20％,30％,40％,50％and 70％(mass fraction)of cement,respectively.The full recycled self-compacting concrete with different water-binder ratios(0.36,0.40 and 0.45)was prepared.Through flexural strength and compressive strength tests,the effects of fly ash content and water-binder ratio on the performance of full recycled self-compacting concrete were analyzed.The reasonable content of fly ash was obtained,and the calculation formula suitable for flexural strength of full recycled self-compacting concrete was proposed.The results show that when fly ash content increases from 20％to 40％,the slump expansion of all recycled self-compacting concrete mixtures increases first and then decreases,and all of them show good clearance capacity,but the expansion time T500 of concrete mixture is not significantly affected by fly ash.With the increase of fly ash content,the compressive strength and flexural strength of fully recycled self-compacting concrete increase first and then decrease,and the flexural strength is more affected by fly ash content than compressive strength.The compressive strength and flexural strength of fully recycled self-compacting concrete are affected by water-binder ratio to the same extent.Based on the effect of fly ash content on the workability and mechanical properties of fully recycled self-compacting concrete,it is suggested that the replacement rate of fly ash to cement is 30％.关键词
自密实混凝土/再生混凝土/粉煤灰掺量/工作性能/抗压强度/抗折强度Key words
self-compacting concrete/recycled concrete/fly ash content/workability/compressive strength/flexural strength分类
建筑与水利引用本文复制引用
郑述芳,李华影,陈祥花,梁莹,陈宗平..粉煤灰掺量对全再生自密实混凝土工作性能与力学性能的影响[J].硅酸盐通报,2024,43(4):1445-1454,10.基金项目
国家自然科学基金(55220105005) （55220105005）
中央引导地方科技发展资金项目(桂科ZY21195010) （桂科ZY21195010）
广西农业科技自筹经费项目(Z202232) （Z202232）
广西高校中青年教师科研基础能力提升项目(2023KY1225) （2023KY1225）
广西大学对口支援学科建设项目(2023N01) （2023N01）
