粗集料对超高强混凝土徐变的影响  

Influence of coarse aggregate on creep of ultra high strength concrete

作　　者：徐怡[1] 茅俊涛 康璇 童松如 陈阳杰 蒋林华[1] XU Yi;MAO Juntao;KANG Xuan;TONG Songru;CHEN Yangjie;JIANG Linhua(College of Mechanics and Materials,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学力学与材料学院,江苏南京211100

出　　处：《混凝土》2024年第4期52-57,共6页Concrete

基　　金：国家自然科学基金面上项目(52178203)。

摘　　要：徐变是混凝土固有的时变特性,对混凝土结构和构件的受力及长期服役性能有着重大影响。以粗集料为切入点,研究粗集料的掺量、粗集料最大粒径以及粗集料与基体性质协调性等因素对超高强混凝土的力学性能和徐变性能的影响。结果表明:掺粗集料的超高强混凝土徐变明显小于不掺粗集料的混凝土,掺粗集料可有效降低超高强混凝土的徐变,但减小粗集料的最大粒径对徐变无明显抑制效果。此外,超高强混凝土并非强度越高徐变越小,其徐变的大小主要受超高强混凝土强度与弹性模量的协同发展程度的影响。通过修正FIB MC2010模型,建立了适用于超高强混凝土的徐变预测模型。As an intrinsic time-dependent property of concrete,creep has significant influence on load-bearing capacity and long-term service performance of concrete structures and members.With the focus on coarse aggregate,the effects of factors such as coarse aggregate content,maximum particle size and aggregate-matrix compatibility on mechanical property and creep performance of ultra high strength concrete(UHSC)were studied.The results show that with the introduction of coarse aggregate the creep of UHSC is remarkably lowered,and reducing the maximum particle size of coarse aggregate has negligible effect on restraining creep.Moreover,the amount of creep is not directly related to the strength of UHSC,but is mainly affected by the degree of cooperative development between strength and elastic modulus.At last,a prediction model on creep of UHSC is established based on correcting the FIB MC2010 model.

关 键 词：超高强混凝土 粗集料 徐变 预测模型 

分 类 号：TU528.041[建筑科学—建筑技术科学]