应力状态下混凝土碳化耐久性试验研究
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摘要
预应力混凝土碳化是预应力混凝土中钢筋锈蚀的一个主要因素,如何对预应力混凝土的碳化深度及其寿命进行准确的预测是急待解决的问题。本文结合国家自然科学基金项目“无粘结预应力混凝土结构的疲劳与耐久性研究”,对应力状态下的混凝土碳化进行了定量的分析。通过试验与理论分析得到混凝土在应力状态下碳化深度的预测模型,为以后预应力混凝土碳化的设计与评估提供一个可供的参考依据。
研究的内容主要有:
1.参考国内外相关研究成果,基于已有的混凝土碳化试验,采用试验研究和理论分析相结合的方法,深入分析不同应力状态下混凝土试件中碳化深度随时间的变化关系,探索应力状态下混凝土碳化机理与规律。
2.对混凝土碳化的影响因素、碳化机理进行分析总结,根据实验结果拟合混凝土在应力状态下碳化深度的计算数学模型。并得出在拉压应力状态下混凝土碳化的碳化系数计算公式。将拟合模型的计算值与试验数据进行对比分析,验证模型的准确性。
3.对应力状态下混凝土碳化深度预测公式进行分析,计算自然环境状态预应力混凝土结构的碳化寿命,同时计算出构件碳化耐久性的可靠度,并进一步推导出预应力结构碳化耐久性极限状态设计与评估方法。
Prestressed concrete carbonation is a major factor of steel corrosion in prestressed concrete.How to predict carbonation and service life of prestressed concrete accurately is a important problem to be solved. Combined with the research on fatigue and durability of unbonded prestressed concrete structure supported by the national natural science foundation of china,quantitative analysis on concrete carbonation in stress status was carried out.Through the analysis of test and theory,the predic -tion modle of concrete carbonation in stress status was obtained.Then provide a grounds for sequent work on design and evaluation of PC concrete carbonation.
The main contents of this thesis include:
1. Taking domestic and overseas correlative development as reference. Based on concrete carbonation test combined with different stress status, experimental research and theoretical analysis were adopted for analysing change relation of concrete carbonation depth in stress status as time changes to obtain the mechanism and law of concrete carbonation in stress status and unstressed status.
2. Influence factors of concrete carbonation and carbonation mechan -ism shall be analysed and summarized.The computing mathematical model of concrete carbonation depth in stress would be fitted according to the experimental results and the carbonation coefficient calculation formula would be obtained . Analyz the calculated value from the modle and the data from the experiment to verify the accuracy of the modle.
3. Analyzing the prediction formula of concrete carbonation which is in stress states,calculate structure's sevice life in the natural environment and calculate out the reliability of carbonation durability.Then derive the carbonation durability limit-state design method of prestressed structure.
研究的内容主要有:
1.参考国内外相关研究成果,基于已有的混凝土碳化试验,采用试验研究和理论分析相结合的方法,深入分析不同应力状态下混凝土试件中碳化深度随时间的变化关系,探索应力状态下混凝土碳化机理与规律。
2.对混凝土碳化的影响因素、碳化机理进行分析总结,根据实验结果拟合混凝土在应力状态下碳化深度的计算数学模型。并得出在拉压应力状态下混凝土碳化的碳化系数计算公式。将拟合模型的计算值与试验数据进行对比分析,验证模型的准确性。
3.对应力状态下混凝土碳化深度预测公式进行分析,计算自然环境状态预应力混凝土结构的碳化寿命,同时计算出构件碳化耐久性的可靠度,并进一步推导出预应力结构碳化耐久性极限状态设计与评估方法。
Prestressed concrete carbonation is a major factor of steel corrosion in prestressed concrete.How to predict carbonation and service life of prestressed concrete accurately is a important problem to be solved. Combined with the research on fatigue and durability of unbonded prestressed concrete structure supported by the national natural science foundation of china,quantitative analysis on concrete carbonation in stress status was carried out.Through the analysis of test and theory,the predic -tion modle of concrete carbonation in stress status was obtained.Then provide a grounds for sequent work on design and evaluation of PC concrete carbonation.
The main contents of this thesis include:
1. Taking domestic and overseas correlative development as reference. Based on concrete carbonation test combined with different stress status, experimental research and theoretical analysis were adopted for analysing change relation of concrete carbonation depth in stress status as time changes to obtain the mechanism and law of concrete carbonation in stress status and unstressed status.
2. Influence factors of concrete carbonation and carbonation mechan -ism shall be analysed and summarized.The computing mathematical model of concrete carbonation depth in stress would be fitted according to the experimental results and the carbonation coefficient calculation formula would be obtained . Analyz the calculated value from the modle and the data from the experiment to verify the accuracy of the modle.
3. Analyzing the prediction formula of concrete carbonation which is in stress states,calculate structure's sevice life in the natural environment and calculate out the reliability of carbonation durability.Then derive the carbonation durability limit-state design method of prestressed structure.
引文
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[2]黄可信,吴兴祖,蒋仁敏等译.钢筋混凝土结构中钢筋腐蚀与保护[M].北京:建筑工业出版社,1983:19-120
[3]吴胜兴.钢筋混凝土结构锈裂损伤研究综述[J].工程力学增刊,2002:10-24
[4]日本建筑学会建筑设计标准委员会编.建筑物的损伤和耐久性对策.张富春译[M].北京:建筑工业出版社,1988:23-28
[5]L Yingyu,W Guidong,The mechanism of carbonation of mortar and the dependence of carbonation on pore structure.In:Proc Katharine and Bryant M ather Int Conf on Concrete Durability.Atlanta,1987,(22):1915-1943
[6]Houst Y F,Wittmann F H,Influence of porosity and water contenton the diffusivity of CO_2 and O_2 through hydrated cement paste.Cement and Concrete Research,1994,(24):1165-1176
[7]Saetta A V,Schrefler B A,Vitaliani R V.The carbonation of concrete and the mechanism of moisture,heat and carbon dioxide flow through porous materials.Cement and Concrete Research,1993,(23):761-772
[8]Parrott L J,et al.Carbonation in a 36 year old in-situ concrete.Cement and Concrete Research,1989,(19):649-656
[9]叶绍勋.混凝土碳化反应的热力学计算[J].硅酸盐通报,1989,(8):2-5
[10]Papadakis V G,Vayenas C G,Fardis M N,A reaction engineering approach to the problem of concrete carbonation.A Ich E Journal,1991,(88):186
[11]Papadakis V G,Vayenas C G,Fardis M N,Physical and chemical characteristics affecting the durability of concrete.A C I Materials Journal,1991,(88):186
[12]Papadakis V G,Vayenas C G,Fardis M N,Fundamental modeling and experimental investigation of concrete carbonation.A C I Materials Journal,1991,(88):363-373
[13]Papadakis V G,Vayenas C G,Fardis M N,Experimental investigation and mathematical modeling of the concrete carbonation problem.Chemical Engineering Science,1991,(46):1333-1338
[14]张誉,蒋利学.混凝土碳化数学模型的剖析[A].南京:建筑物鉴定与加固第三届全国学术讨论会文集,1995:50-58,10
[15]Tuutti K,Corrosion of steel in concrete.C B I Research,1984,(4)
[16]Skjolsvold O,a c I s p-91 Madrud Proc.1986,(2):1031-1048
[17]Ho D W S,Lewis R L.The carbonation of concrete and its prediction.Cement and ConcreteResearch,1987,(17):489-504
[18]Dhir R K,Hewlett P C,Chan Y N.Near surface characteristics of concrete:prediction of carbonation resistance.Magazine of Concrete Research,1989,(41):137-143
[19]方景,梅国兴,陆采荣.影响混凝土碳化主要因素及钢锈因素试验研究[J].混凝土,1993,(2):23-26
[20]Thomas M D A,Matthews J D.Carbonation of fly ash concrete.Magazine of Concrete Research,1992,(44):217-228
[21]Hobbs D W.Carbonation of concrete containing PFA.Magazine of Concrete Research,1994,(46):35-38
[22]Ceukelaire L D,Nieuwenbeg D V.Accelerated carbonation of a blast-fumace cement concrete.Cement and Concrete Research,1993,(3):442-452
[23]Bijen J.Selst R Vibid,1993,(10):1001-1030
[24]Sakai E,Kosuge K,Teramura S,et al.Durability of concrete,1991,ACISP-(126):989-1000
[25]马文海.水泥用量对碳化深度的影响[J].低温建筑技术,1986,(1):27-32
[26]张誉,蒋利学等.混凝土碳化深度的计算与实验研究[J].混凝土,1996,(4):12-17
[27]Kobayashi K,Uno Y.Influence of alkakion carbonation of concrete(part 1)preliminary tests with mortar speciments.Cement and Concrete Research,1989,(19):821-826
[28]Lydon F D,et al.Effect of coarse aggregate on relative permeability of concrete.Construction andBuilding Materials,1994,(8):3
[29]Fattuhi N I.Carbonation and concrete as affected by mix constitutents and initial water curing period.Materials Etconstructtions,1986,(19):131-136
[30]Nagatakis,et al.Effect of curing conditions on the carbonation of concrete with fly ash and the corrosion of reinforcement in long-term test.A C I S P-91,1986,(1):521-540
[31]Ewertson C.The influence of curing conditions on the permeability and durability of concrete,resuit from a field exposure test.Cement and Concrete Research,1993,(23):683
[32]胡利娟.养护方式对混凝土碳化作用的影响[J].云南建材,1989,(3):10-13
[33]Reardon E I,James B R,Abouchar J.High pressure carbonation of cementitious grout.Cement and Concrete Research,1989,(19):385-399
[34]张令茂,文江辉.混凝土自然碳化及其与人工加速碳化的相关性研究[J].西安冶金建筑学院学报,1990,(22):32-35
[35]李果,袁迎曙,耿欧.气候条件对混凝土碳化速度的影响[J].混凝土,2004,(11):49-51
[36]Ho D W S,Harrison R S.Influence of surface coating on carbonation of concrete.Journal of Materials in Civil Engineering,1990,(2):35-44
[37]张令茂.混凝土表面覆盖的碳化延迟系数的研究[J].西安冶金建筑学院学报,1989,(21):34-40
[38]邸小坛,周燕.混凝土碳化规律研究[J].中国建筑科学研究院,1995,(3):18-24
[39]Sharobm K G,Tzzawa E.Study on carbonation of mortar beem subjected to cracking.Proceedings of the Japan Society of Civil Engineering,1989,(408):167-174
[40]Nishi T.Proc RILEM Symp 1962.Testing of Concrete,485-489
[41]朱安民.混凝土碳化与钢筋混凝土耐久性[J].混凝土,1992,(6):23-25
[42]许丽萍,黄士元.预测混凝土中碳化深度的数学模型[J].上海建材学院学报,1991,(4):10-15
[43]龚洛书,苏曼青.混凝土多系数碳化方程及其应用[J].混凝土及加筋混凝土,1985,(6):12-18
[44]邸小坛,周燕.旧建筑物的检测加固于维护[M].北京:地震出版社,1994:18-35
[45]Smolczyk H G..Proceedings of 5th international symposium on chemistry of cement.Tokyo,1968,(3):343-368
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