- 摘 要
-
(1 西安建筑科技大學(xué)西部綠色建筑國家重點實驗室， 西安 710055；2 西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055)
［摘要］長期處于侵蝕環(huán)境中的混凝土結(jié)構(gòu)，因耐久性損傷及性能劣化，導(dǎo)致其實際使用壽命遠(yuǎn)低于設(shè)計使用年限，造成了巨大的經(jīng)濟(jì)損失和資源浪費。充分考慮了腐蝕環(huán)境的多樣性以及混凝土結(jié)構(gòu)耐久性問題的復(fù)雜性，在總結(jié)混凝土結(jié)構(gòu)耐久性評估理論與方法及工程實踐經(jīng)驗的基礎(chǔ)上，提出了既有混凝土結(jié)構(gòu)耐久性評定的原則與方法；針對一般環(huán)境、氯鹽環(huán)境、凍融環(huán)境、硫酸鹽環(huán)境等侵蝕環(huán)境，明確了既有混凝土耐久性評定的指標(biāo)與技術(shù)要求，對既有混凝土結(jié)構(gòu)耐久性極限狀態(tài)與失效標(biāo)準(zhǔn)進(jìn)行了界定；考慮耐久性損傷對混凝土構(gòu)件剛度與承載力的影響，實現(xiàn)了從構(gòu)件到結(jié)構(gòu)耐久性的綜合評定。對科學(xué)評價既有房屋建筑、道路橋梁、地下結(jié)構(gòu)及工業(yè)建、構(gòu)筑物的普通混凝土結(jié)構(gòu)的耐久性能，準(zhǔn)確預(yù)測既有混凝土結(jié)構(gòu)的剩余使用壽命，制定合理的耐久性修復(fù)、維護(hù)對策具有重要的指導(dǎo)意義。
［關(guān)鍵詞］混凝土結(jié)構(gòu)；耐久性評定；氯鹽腐蝕；凍融環(huán)境；硫酸鹽腐蝕；堿與骨料反應(yīng)
中圖分類號：TU375,TU398-7 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)17-0115-07
Durability assessment method of existing concrete structures
NIU Ditao1,2, YANG Dezhu1,2, LUO Daming1,2
(1 State Key Laboratory of Green Building in Western China, Xi’an University of Architecture and Technology, Xi’an 710055， China； 2 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055， China)
Abstract: Due to durability damage and performance degradation, the actual service life of existing concrete structure in long-term corrosive environment is far less than the design service life, resulting in huge economic losses and resource waste. The diversity of corrosive environment and the complexity of durability of concrete structure were fully considered. On the basis of summarizing the theory and method of durability assessment of concrete structure and engineering practice experience, the principle and method of durability assessment of existing concrete structure were proposed. According to the general environment, chloride environment, freeze-thaw environment, sulfate environment and other corrosive environment, the index and technical requirements of existing concrete durability assessment are defined, and the durability limit state and failure criteria of existing concrete structure were defined. Considering the influence of durability damage on the stiffness and bearing capacity of concrete members, the comprehensive assessment of durability from member to structure was realized. It has important guidance for scientifically evaluating the durability of ordinary concrete structures of existing buildings, roads and bridges, underground structures, industrial buildings and structures, accurately predicting the remaining service life of existing concrete structures, and formulating reasonable durability repair and maintenance countermeasures.
Keywords:concrete structure； durability assessment; chloride corrosion； freezing-thawing environment； sulfate corrosion； alkali-aggregate reactivity
*國家自然科學(xué)基金項目（51808438，52078413）。
作者簡介：牛荻濤，博士，教授，博士生導(dǎo)師，Email: niuditao@163.com； 通信作者：羅大明，博士，副教授，碩士生導(dǎo)師，Email: dmluo@xauat.edu.cn。
