硫酸腐蚀钢筋混凝土梁斜截面受剪性能试验研究
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摘要
化工厂房、污水管道和酸雨等环境中有较高浓度的硫酸,受硫酸腐蚀后,钢筋混凝土梁表层混凝土严重损伤,混凝土强度显著降低,梁受剪性能产生较大变化。考虑混凝土腐蚀层厚度和剪跨比等因素,对硫酸腐蚀钢筋混凝土梁受剪性能进行试验,研究混凝土腐蚀层厚度和剪跨比对钢筋混凝土梁截面应变、开裂荷载、破坏形态、承载力以及挠度等影响规律。研究结果表明:腐蚀梁破坏形态主要受剪跨比影响;随着腐蚀层厚度增加,梁截面应变和开裂荷载增大;承载力减小;变形增大。基于硫酸腐蚀对混凝土强度、剪跨比和截面尺寸等影响,提出硫酸腐蚀钢筋混凝土梁受剪承载力计算式,计算值与试验值吻合较好。
There is a higher concentration sulfuric acid in chemical plants,sewage pipes and acid rains. After being corroded by sulfuric acid the reinforced concrete beam surface layer is seriously damaged,the concrete strength is significantly reduced,and the beam shear properties are changed greatly. The experimental search on the shear performance of reinforced concrete beam subjected to sulfuric acid corrosion was carried out the effects of corrosion layer thickness and shear span ratio on the laws of section strains,cracking loads,failure modes,bearing capacities and deflections were investigated. The results showed that the failure modes of the beams were affected by shear span ratio.With the increase of the corrosion layer thickness,the section strain and cracking loads increased,the bearing capacity of concrete beams decreased,and the deformations increased. Based on concrete strength,shear span ratio and section size changes caused by sulfuric acid corrosion,shear bearing capacity calculation formula of reinforced concrete beam sulfected to sulfuric acid corrosion was presented,the calculation results agreed well with the experimental results.
There is a higher concentration sulfuric acid in chemical plants,sewage pipes and acid rains. After being corroded by sulfuric acid the reinforced concrete beam surface layer is seriously damaged,the concrete strength is significantly reduced,and the beam shear properties are changed greatly. The experimental search on the shear performance of reinforced concrete beam subjected to sulfuric acid corrosion was carried out the effects of corrosion layer thickness and shear span ratio on the laws of section strains,cracking loads,failure modes,bearing capacities and deflections were investigated. The results showed that the failure modes of the beams were affected by shear span ratio.With the increase of the corrosion layer thickness,the section strain and cracking loads increased,the bearing capacity of concrete beams decreased,and the deformations increased. Based on concrete strength,shear span ratio and section size changes caused by sulfuric acid corrosion,shear bearing capacity calculation formula of reinforced concrete beam sulfected to sulfuric acid corrosion was presented,the calculation results agreed well with the experimental results.
引文
[1]牛荻涛,林明强,李月晨.复杂化工环境混凝土腐蚀破坏机理分析[J].建筑结构学报,2014(增刊1):136-141.
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[8] WILLEM DE MUYNCK,NELE DE BELIE,WILLY VERSTRAETE.Effectiveness of Admixtures,Surface Treatments and Antimicrobial Compounds Against Biogenic Sulfuric Acid Corrosion of Concrete[J].Cement and Concrete Composites,2009(31):163-170.
[9] ZHOU J K,CHEN X D,CHEN S X. Durability and Service Life Prediction of GFRP Bars Embedded in Concrete Under Acid Environment[J]. Nuclear Engineering and Design,2011(241):4095-4102.
[10]曹双寅.受硫酸和硫酸盐腐蚀的混凝土结构非线性分析和耐久性预测[D].上海:同济大学,1988.
[11]范颖芳,王大为,栾海洋.模拟酸沉降环境混凝土梁承载性能研究[J].工程力学,2014,31(4):147-177.
[12] HUSNU GERENGI A, YLMAZ KOCAK B, AGATA JAZDZEWSKA. Electrochemical Investigations on the Corrosion Havior of Reinforcing Steel in Diatomite and Zeolite Containing Concrete Exposed to Sulphuric Acid[J].Construction and Building Materials,2013(49):471-477.
[13]中华人民共和国住房和城乡建设部.混凝土结构试验方法标准:GB 50152—2012[S].北京:中国建筑工业出版社,2012.
[14] GAETANO RUSSO. Shear Strength Design Formula for RC Beams with Stirrups[J]. Engineering Structures,2013(51):226-235.
[2] SAIPRASAD VAIDYA,EREZ N ALLOUCHE. Electrokinetically Deposited Coating for Increasing the Service Life of Partially Deteriorated Concrete Sewers[J]. Construction and Building Materials,2010,24:2164-2170.
[3]闻宝联.城市污水环境下混凝土腐蚀及耐久性研究[D].天津:天津大学,2005.
[4]洪乃丰.水环境腐蚀与混凝土的耐久性[J].腐蚀与防护,2006,27(4):174-177.
[5]李北星,周长泉,蔡老虎,等.硫酸环境作用下粉煤灰混凝土性能劣化时变规律[J].材料科学与工程学报,2012,32(6):809-815.
[6] MONTENY J,VINCKE E,BEELDENS A.Chemical,Microbiological,and in Situ Test Methods for Biogenic Sulfuric Acid Corrosion of Concrete[J]. Cement Concrete Research,2000,30(4):623-634.
[7] PACHECO-TORGAL F,SAID JALALI. Sulphuric Acid Resistance of Plain,Polymer Modified, and Fly Ash Cement Concretes[J].Construction and Building Materials,2009,23:3485-3491.
[8] WILLEM DE MUYNCK,NELE DE BELIE,WILLY VERSTRAETE.Effectiveness of Admixtures,Surface Treatments and Antimicrobial Compounds Against Biogenic Sulfuric Acid Corrosion of Concrete[J].Cement and Concrete Composites,2009(31):163-170.
[9] ZHOU J K,CHEN X D,CHEN S X. Durability and Service Life Prediction of GFRP Bars Embedded in Concrete Under Acid Environment[J]. Nuclear Engineering and Design,2011(241):4095-4102.
[10]曹双寅.受硫酸和硫酸盐腐蚀的混凝土结构非线性分析和耐久性预测[D].上海:同济大学,1988.
[11]范颖芳,王大为,栾海洋.模拟酸沉降环境混凝土梁承载性能研究[J].工程力学,2014,31(4):147-177.
[12] HUSNU GERENGI A, YLMAZ KOCAK B, AGATA JAZDZEWSKA. Electrochemical Investigations on the Corrosion Havior of Reinforcing Steel in Diatomite and Zeolite Containing Concrete Exposed to Sulphuric Acid[J].Construction and Building Materials,2013(49):471-477.
[13]中华人民共和国住房和城乡建设部.混凝土结构试验方法标准:GB 50152—2012[S].北京:中国建筑工业出版社,2012.
[14] GAETANO RUSSO. Shear Strength Design Formula for RC Beams with Stirrups[J]. Engineering Structures,2013(51):226-235.