水利学报2026，Vol.57Issue(8)：1259-1269,11.DOI:10.3724/j.slxb.20250691
不同干燥温度下水工混凝土脱水与变形规律及机制
Deformation patterns and mechanisms of hydraulic concrete during dehydration under different drying temperatures
摘要
Abstract
The hydraulic concrete undergoes slow but non-negligible deterioration under drying-wetting cycles.While laboratory accelerated testing serves as an effective research approach for investigating this process,two key issues persist:drying shrinkage acts as the intrinsic driving force of deterioration under drying-wetting cycles,yet the multi-scale deformation mechanism remains unclear;and the absence of unified standards for drying temperatures directly affects the determintaion of the drying rate,deformation patterns,and degradation mechanisms.Multi-scale drying tests on concrete,mortar,and paste were performed in this study,combined with microstructural analyses such as 1H and 29Si nuclear magnetic resonance spectroscopy,to characterize dehydration,deformation patterns,and the evolution of hydration products.Results show that both water loss rate and shrinkage of concrete,mortar,and paste increase with drying degree and temperature,exhibiting a development pattern of initial slow acceleration fol-lowed by rapid acceleration.Concrete shrinkage is mainly governed by shrinkage stresses induced by water loss from pores of various sizes.Elevated temperature promotes water loss from smaller pores and leads to continuous consump-tion of gel water and interlayer water,thereby intensifying nonlinear shrinkage.High temperatures cause irreversible damage to hydration products,manifested as loss of crystalline water and phase transformation of aluminate phases,as well as polymerization/depolymerization of calcium silicate hydrate gels,fundamentally altering the deformation mechanism.A predictive model was established between shrinkage rate and water loss rate and a recommended drying temperature threshold of 60 ℃ was proposed,providing theoretical support for accurate long-term performance prediction of hydraulic concrete.关键词
水工混凝土/干燥温度/变形/脱水/水化硅酸钙Key words
hydraulic concrete/drying temperature/deformation/dehydration/calcium silicate hydrate分类
建筑与水利引用本文复制引用
崔进杨,李曙光,李文伟,杨华美,田丹,张开来..不同干燥温度下水工混凝土脱水与变形规律及机制[J].水利学报,2026,57(8):1259-1269,11.基金项目
湖北省战略科技人才培育项目(2024DJA036) （2024DJA036）
湖北省自然科学基金三峡联合基金培育项目(2023AFD196) （2023AFD196）
河南省引江济淮科研服务项目(HNYJJH/JS/FWKY-2021005) （HNYJJH/JS/FWKY-2021005）
中国长江三峡集团有限公司自主科研项目(NBZZ202400043) （NBZZ202400043）
