组成材料对混凝土抗氯离子渗透性能的影响
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摘要
本论文进行了组成材料对净浆、砂浆、混凝土抗氯离子渗透性能影响的研究。在掺和料取代水泥量为50%的情况下,净浆部分研究了不同掺料(掺和料+纤维、胶粉)、不同龄期分别对其抗氯离子渗透性能的影响;砂浆部分研究了不同水胶比、不同掺和料、不同龄期、不同砂胶比分别对其抗氯离子渗透性能的影响;混凝土部分研究了不同水胶比、不同掺和料、不同龄期、不同砂率分别对其抗氯离子渗透性能及抗压强度的影响。通过ASTM C1202(直流电量法)测定了不同组成材料净浆、砂浆、混凝土在不同龄期的电通量。
试验结果表明:(1)矿渣和膨胀剂一起掺入能提高净浆的抗氯离子渗透性能,纤维的作用效果不明显。(2)掺料对砂浆抗氯离子渗透性能影响大小表现为:胶粉＞矿渣＞膨胀剂＞纤维,复掺时效果更好。当砂胶比为3或4时,砂浆的抗氯离子渗透性能最强。(3)掺入矿渣使混凝土早期强度下降,后期强度增大;混凝土的抗氯离子渗透性能大大提高。(4)当矿渣和膨胀剂一起掺入时,混凝土的抗氯离子渗透性能显著提高。(5)砂率40%至45%时,混凝土的抗压强度最大,抗氯离子渗透性能最优。(6)试验测试混凝土抗氯离子渗透性能过程中,如果电流始终比较稳定,则初始电流与总的电量呈良好的线性关系,说明在一定条件下,利用初始电流来代替电量来评价混凝土的抗氯离子渗透性能是可行的,但适用范围仍有待确定。(7)混凝土中水泥浆体的含量是影响混凝土抗氯离子渗透性能的重要因素。
The durability of cement paste, mortar and concrete with different constituent materials was studied in this thesis, and the focus is on inspecting the resistance to chloride ion penetration. The cement paste part inspects the influence on resistance to chloride ion penetration by different added materials and different ages when the total replaced amount of mineral admixture is 50%; The mortar part inspects the influence on resistance to chloride ion penetration by different water-binder ratios, different added materials, different sand-binder ratios and different ages; The concrete part inspects the influence on resistance to chloride ion penetration and compressive strength by different water-binder ratios, different added materials, different sand percentage and different ages. Electrical conductance of cement paste, mortar and concrete at different ages is tested by ASTM C1202.
The results of the experiments indicate: (1) Cement paste with slag and expansion agent can greatly improve its resistance to chloride ion penetration, but the effect of using fiber is not obvious. (2) The resistance to chloride ion penetration of mortar with different added materials performs differently; the resistance with emulsion powder is better than that with slag, than that with expansion agent and than that with fiber, and the resistance with emulsion powder, slag and expansion agent is the best. When the sand-binder ratio is 3 or 4, the resistance to chloride ion penetration is the best, that is better than that when the sand-binder ratio is 1 or 2. (3) When the added material is slag, the strength of concrete decreases at early ages but increases at 28-days and 56-days; however, the resistance to chloride ion penetration is improved greatly. (4) When slag and expansion agent are used together, the resistance to chloride ion penetration is improved obviously. (5) When the sand percentage is between 40% and 45%, the compressive strength of the concrete is greatest and the resistance to chloride ion penetration is the excellent. (6) In the process of testing the resistance to chloride ion penetration, if the electric current is quite stable throughout, the final quantity of electricity is linearly dependent on the initial electric current; therefore, initial current can instead quantity of electricity and becomes referenced index to evaluate concrete's resistance to chloride ion penetration under certain conditions, but the application scope has not been decided. (7) The cement paste content in, the concrete is the important factor which affects the resistance to chloride ion penetration.
试验结果表明:(1)矿渣和膨胀剂一起掺入能提高净浆的抗氯离子渗透性能,纤维的作用效果不明显。(2)掺料对砂浆抗氯离子渗透性能影响大小表现为:胶粉＞矿渣＞膨胀剂＞纤维,复掺时效果更好。当砂胶比为3或4时,砂浆的抗氯离子渗透性能最强。(3)掺入矿渣使混凝土早期强度下降,后期强度增大;混凝土的抗氯离子渗透性能大大提高。(4)当矿渣和膨胀剂一起掺入时,混凝土的抗氯离子渗透性能显著提高。(5)砂率40%至45%时,混凝土的抗压强度最大,抗氯离子渗透性能最优。(6)试验测试混凝土抗氯离子渗透性能过程中,如果电流始终比较稳定,则初始电流与总的电量呈良好的线性关系,说明在一定条件下,利用初始电流来代替电量来评价混凝土的抗氯离子渗透性能是可行的,但适用范围仍有待确定。(7)混凝土中水泥浆体的含量是影响混凝土抗氯离子渗透性能的重要因素。
The durability of cement paste, mortar and concrete with different constituent materials was studied in this thesis, and the focus is on inspecting the resistance to chloride ion penetration. The cement paste part inspects the influence on resistance to chloride ion penetration by different added materials and different ages when the total replaced amount of mineral admixture is 50%; The mortar part inspects the influence on resistance to chloride ion penetration by different water-binder ratios, different added materials, different sand-binder ratios and different ages; The concrete part inspects the influence on resistance to chloride ion penetration and compressive strength by different water-binder ratios, different added materials, different sand percentage and different ages. Electrical conductance of cement paste, mortar and concrete at different ages is tested by ASTM C1202.
The results of the experiments indicate: (1) Cement paste with slag and expansion agent can greatly improve its resistance to chloride ion penetration, but the effect of using fiber is not obvious. (2) The resistance to chloride ion penetration of mortar with different added materials performs differently; the resistance with emulsion powder is better than that with slag, than that with expansion agent and than that with fiber, and the resistance with emulsion powder, slag and expansion agent is the best. When the sand-binder ratio is 3 or 4, the resistance to chloride ion penetration is the best, that is better than that when the sand-binder ratio is 1 or 2. (3) When the added material is slag, the strength of concrete decreases at early ages but increases at 28-days and 56-days; however, the resistance to chloride ion penetration is improved greatly. (4) When slag and expansion agent are used together, the resistance to chloride ion penetration is improved obviously. (5) When the sand percentage is between 40% and 45%, the compressive strength of the concrete is greatest and the resistance to chloride ion penetration is the excellent. (6) In the process of testing the resistance to chloride ion penetration, if the electric current is quite stable throughout, the final quantity of electricity is linearly dependent on the initial electric current; therefore, initial current can instead quantity of electricity and becomes referenced index to evaluate concrete's resistance to chloride ion penetration under certain conditions, but the application scope has not been decided. (7) The cement paste content in, the concrete is the important factor which affects the resistance to chloride ion penetration.
引文
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[2]洪乃丰.基础设施腐蚀防护和耐久性问与答[M].北京:化学工业出版社,2003(8):7-9
[3]美国AC1222委员会报告.混凝土中金属的腐蚀.海工钢筋混凝土耐久性译文集[C].上海交通部第三航务工程科研所,1988
[4]葛燕,朱锡昶,朱雅仙,李岩.混凝土中钢筋的腐蚀与阴极保护[M].北京:化学工业出版社,2007(8):1-3
[5]日本土木学会编.混凝土构筑物的维护、修补与拆除[M].张富春译.北京:中国建筑工业出版社,1990
[6]洪定海.混凝土中钢筋的腐蚀与保护[M].北京:中国铁道出版社,1998:1-5
[7]B.M.莫斯克文,伊万诺夫等著.混凝土和钢筋混凝土的腐蚀及其防护方法[M].倪继淼,何进源等译.北京:化学工业出版社,1990
[8]Metha P.K.Concrete Durability Fifty year's Progress.Proc.of 2~(nd) Inter.Conf.on Concrete Durability.ACI Sp-126,1991:1-31
[9]张誉等.混凝土结构耐久性概论[M].上海:上海科学出版社,2003:4-6
[10]V.Saraswathy,S.Muralidharan,K.Thangavel,S.Srinivasan.Influence of activated fly ash on corrosion resistance and strength of concrete.Cement and Concrete Composites,2003,25(7):673-680
[11]洪乃丰.混凝土中钢筋锈蚀与防护技术(3)--氯盐与钢筋锈蚀破坏.工业建筑,1999,29(10):60-63
[12]Kalousek G L,porter L C,concrete for long-term service in sulfate environment[J].Cement and Concrete Research,1972,2(1):79-90
[13]Weyers.R.E.Service life Model for Concrete Structures in Chloride Laden Environments.ACI,Materials journal,Vol.95.1998(4):445-453
[14]余红发,孙伟,麻海燕,鄢良慧.混凝土在多重因素作用下的氯离子扩散方程[J].建筑材料学报,2002,5(3):240-247
[15]Mumtaz K.Kassir Michel Ghosn,Chloride-induced corrosion of reinforced concrete bridge decks[J].Cement and Concrete Research.2002.32:139-143
[16]李积平,潘德强,白俊峰等.海工高性能混凝土抗氯离子侵蚀耐久寿命预测.北京:土建结构工程的安全性与耐久性,2001
[17]孙伟,余洪发.混凝土结构工程的耐久性与寿命研究进展.北京:土建结构工程的安全性与耐久性,2001
[18]R S.Mangat,B.T.Molloy,Prediction of long term chloride concentration on concrete.Materials and Structures,1994,27:338-346
[19]Paul Sandberg,Studies of chloride binding in concrete exposed in a marine environment.Cement and Concrete Research,1999,29(9):473-477
[20]Syed Ehtesham Hussain,Ahrnad S.A1Gahtani,and Rasheeduzzafar.Chloride Threshold for Corrosion of Reinforcement in Concrete.ACI,Materials Jounral,Vol.94.1996(6)
[21]刘芳.混凝土氯离子浓度确定及耐蚀剂作用[D].杭州:浙江大学建筑工程学院,2006
[22]余红发,孙伟,鄢良慧,麻海燕.混凝土使用寿命预测方法的研究Ⅰ--理论模型[J].硅酸盐学报,2002,30(6):686-690
[23]叶青,毛安慰,兰凤华,韦苏.聚丙烯纤维对海工混凝土抗氯离子渗透性能的影响[J].新型建筑材料,2007(2):1-4
[24]谢祥明,莫海鸿.大掺量矿渣微粉提高混凝土抗氯离子渗透性的研究[J].水利学报,2005,36(6):737-740
[25]谢友均,刘宝举,刘伟.矿物掺合料对高性能混凝土抗氯离子渗透性能的影响[J].铁道科学与工程学报,2004,1(2):46-51
[26]唐旭光,谢友均.矿物掺合料对混凝土抗氯离子渗透性能影响的试验研究[J].湘潭师范学院学报(自然科学版),2005,27(2):5-8
[27]叶青,汪佳佳,马成畅,李丽琴.膨胀剂掺量对混凝土抗氯离子渗透性能的影响[J].建筑材料学报,2005,8(2):192-196
[28]李漠,管小军.表面涂层对混凝土抗氯离子渗透性能的影响[J].新型建筑材料,2006(11):52-53
[29]赵铁军,周宗辉,迟培云.水胶比、掺合料和龄期对混凝土渗透性的影响[J].混凝土,1998(2):19-22,14
[30]邢锋,冷发光,冯乃谦,马冬花.长期持续荷载对素混凝土氯离子渗透性的影响[J].混凝土,2004(5):3-8
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