腐蚀环境下预应力锚筋的耐久性试验研究

doi:10.13722/j.cnki.jrme.2014.0833

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摘要为了深入研究岩土锚固结构长期性能的损伤演化规律，在室内腐蚀环境下开展了预应力锚筋的加速腐蚀试验与腐蚀试件材料性能试验。基于试验成果分析腐蚀pH值、时间、应力水平、供氧水平等因素对预应力筋材腐蚀外观、单位长度腐蚀量以及力学性能损失的影响规律。分析结果表明，这些因素与预应力锚筋的腐蚀及损伤程度密切相关，主要表现出如下特征：(1) 腐蚀时间越长，筋材腐蚀程度越严重；(2) 酸性液浸泡后筋材腐蚀程度明显，且酸性腐蚀液pH值越小，筋材腐蚀程度越高，而碱性溶液浸泡后筋材腐蚀不明显；(3) 在强腐蚀条件下，筋材的应力水平越高，筋材腐蚀程度越严重；(4) 在弱腐蚀条件下，筋材的腐蚀程度与供氧水平密切相关，供氧不足时，筋材腐蚀程度较轻。

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关键词 ：岩土工程, 腐蚀, 预应力, 锚筋, 耐久性

Abstract：In order to study the damage evolution rule of long-term performance of pre-stressed anchor structure，accelerated corrosion tests and material property tests of pre-stressed anchor bar are conducted in corrosion environment indoors. Based on test results，the influence laws of various factors such as corrosion pH，corrosion time，stress level，oxygen level，etc. on the corrosion appearance，corrosion weight per unit length and loss of mechanical properties of pre-stressed anchor bar are analyzed. The study results show that these influencing factors are closely related to the degree of corrosion and damage of pre-stressed tendons anchor. The influence law can be drawn as follows：(1) The longer the corrosion lasts，the more serious the degree of corrosion of pre-stressed anchor bar is. (2) The anchor bar corrodes significantly after acidic liquid immersion，and the smaller the corrosion pH is，the more serious the degree of corrosion of anchor bar is. While corrosion of anchor bar is not obvious after alkaline liquid immersion. (3) In strongly corrosive conditions，the higher the stress level is，the more serious the degree of corrosion of anchor bar is. 4) Under the conditions of weak corrosion，the extent of corrosion of anchor bar is closely related to oxygen level，and the anchor bar corrodes lightly in the environment with insufficient oxygen.

Key words： geotechnical engineering corrosion pre-stress anchor bar durability

引用本文:

李聪，朱杰兵，汪斌，蒋昱州，曾平. 腐蚀环境下预应力锚筋的耐久性试验研究[J]. 岩石力学与工程学报, 2015, 34(s1): 3356-3364.
LI Cong，ZHU Jiebing，WANG Bin，JIANG Yuzhou，ZENG Ping. DURABILITY TEST STUDY OF PRESTRESSED ANCHOR BAR IN CORROSION ENVIRONMENT. , 2015, 34(s1): 3356-3364.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0833 或 http://www.rockmech.org/CN/Y2015/V34/Is1/3356

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