摘要
活性粉末混凝土(Reactive Powder Concrete,RPC)是一种超高性能水泥基复合材料。再生微粉是由废弃混凝土和废弃烧结砖经破碎、粉磨制成的微细粉末,其含有未水化的活性颗粒,可作为补充胶凝材料掺于RPC中。本文研究了养护条件对再生微粉RPC力学性能的影响。试验研究了蒸汽养护和标准养护条件下再生微粉RPC 3 d、7 d和28 d龄期的抗折强度、抗压强度和28 d龄期的轴心抗压强度、杨氏模量。试验结果表明,蒸汽养护对再生微粉RPC的3 d、7 d的抗折、抗压强度提升作用明显,可提高28 d抗压强度和轴心抗压强度,但是会降低28 d抗折强度,对28 d弹性模量影响不大。此外,蒸汽养护会降低试件折压比,即降低试件的韧性和抗裂性能。利用有限元软件ANSYS在细观层次上对再生微粉RPC受力性能进行模拟,模拟结果与试验结果较吻合。
Reactive Powder Concrete(RPC)is an ultra-high performance cement-based composite material.Recycled powder is produced from waste concrete and waste brick by crushing and grinding.It includes unhydrated particles and could act as complementary cement materials for RPC.This paper studied the flexural,compressive strength at 3 d,7 d,28 d and axial compressive strength,elastic modulus at 28 d under two different curing conditions(steam curing and standard curing).Results show that steam curing greatly increases flexural and compressive strength of RPC at 3 d and 7 d.Steam curing improves the compressive strength and axial compressive strength at 28 d,but decreases 28 d flexural strength and has little effect on 28 d elastic modulus.In addition,steam curing reduces flexural strength to compressive strength ratio(toughness and crack resistance).Then ANSYS was used to simulate the mechanical properties of recycled RPC concrete at the mesoscopic level,and the simulation fits well with the experiments.
作者
朱鹏
许林
吴宇清
屈文俊
ZHU Peng;XU Lin;WU Yuqing;QU Wenjun(Department of Structural Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Performance Evolution and Control for Engineering Structures,Tongji University,Ministry of Education,Shanghai 200092,China)
出处
《结构工程师》
2025年第3期115-126,共12页
Structural Engineers
基金
国家重点研发计划(2022YFC3801100)
国家自然科学基金(51208373)。
关键词
RPC
再生微粉
养护条件
力学性能
弹性模量
RPC
recycled powder
curing condition
mechanical properties
elastic modulus
