粉煤灰掺量对膨胀混凝土抗冻性和抗氯离子渗透性的影响
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摘要
依托内蒙古上海庙镇±800kV换流站建设工程,试验研究了在相同水胶比条件下粉煤灰掺量对膨胀混凝土抗压强度、抗冻性(抗水冻和抗盐冻)、抗氯离子渗透性等性能的影响.结果表明:随着粉煤灰掺量的增大,混凝土28d抗压强度降低,抗冻性和抗氯离子渗透性等亦均变差,这主要应归因于在用水量、水胶比相同的条件下,粉煤灰掺量增大时,混凝土中因水泥用量减少而导致水化产物的数量减少、水泥石微观结构密实度下降;粉煤灰掺量20%的混凝土强度等级C35以上,抗冻等级F200以上,抗氯离子渗透性能亦较好.将这一配比的混凝土用于该换流站工程换流阀水冷系统中水池结构的建设,工程现场检测证实,混凝土各项性能均满足工程设计要求,制得的水池结构质量良好.
Based on the construction project of the electricity converter station with 800 kV located in the Shanghaimiao Town of the Inner Mongolia Autonomous Region,the influence of fly ash content on compressive strength,frost resistance(frost and salt-frost resistance)and chloride ion permeability of expansive concrete with the same water-cement ratio are studied.The results show that with the increase of fly ash content,the 28 dcompressive strength of concrete decreased and the properties of frost resistance and resistance to chloride ion permeability deteriorated too,which was attributed to the decrease of cement dosage resulting from the increase of the content of fly ash;and thus,the amount of hydrated products in the concrete reduced and the microstructure density of the cement paste decreased.Furthermore,the strength of concrete with fly ash content of 20% meets the requirements of the concrete with strength grade of C35;the frost resistance grade is over F200 and the chloride ion permeability is quite good.The concrete with same mixing proportion had been utilized for construction of the pool structure in water cooling system ofthe electricity converter valve of the electricity converter station;and the tests confirmed that the performance of concrete and the pool structure met the design requirements of the project.
Based on the construction project of the electricity converter station with 800 kV located in the Shanghaimiao Town of the Inner Mongolia Autonomous Region,the influence of fly ash content on compressive strength,frost resistance(frost and salt-frost resistance)and chloride ion permeability of expansive concrete with the same water-cement ratio are studied.The results show that with the increase of fly ash content,the 28 dcompressive strength of concrete decreased and the properties of frost resistance and resistance to chloride ion permeability deteriorated too,which was attributed to the decrease of cement dosage resulting from the increase of the content of fly ash;and thus,the amount of hydrated products in the concrete reduced and the microstructure density of the cement paste decreased.Furthermore,the strength of concrete with fly ash content of 20% meets the requirements of the concrete with strength grade of C35;the frost resistance grade is over F200 and the chloride ion permeability is quite good.The concrete with same mixing proportion had been utilized for construction of the pool structure in water cooling system ofthe electricity converter valve of the electricity converter station;and the tests confirmed that the performance of concrete and the pool structure met the design requirements of the project.
引文
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[2]徐存东,谢佳琳,丁廉营,等.冻融作用下粉煤灰引气混凝土动弹性模量的衰减规律研究[J].水利水电技术,2017,48(3):113-118.
[3]肖前慧,牛荻涛,朱文凭.粉煤灰引气混凝土冻融循环后性能的试验研究[J].武汉理工大学学报,2010,32(7):35-38.
[4]王德志,陈振,孟云芳.氯盐冻融作用下粉煤灰混凝土抗渗抗冻性研究[J].人民黄河,2017,39(12):131-133,138.
[5] Yoon Y S,Won J P,Woo S K,et al.Enhanced Durability Performance of Fly Ash Concrete for Concrete-faced Rockfill Dam Application[J].Cement&Concrete Research,2002,32(1):23-30.
[6]谭克锋.水灰比和掺合料对混凝土抗冻性能的影响[J].武汉理工大学学报,2006,28(3):58-60.
[7]林旭健,张生营,季韬.粉煤灰混凝土抗氯离子渗透及抗钢筋锈蚀性能[J].建筑材料学报,2006,9(2):216-220.
[8]江涛,曾水金,曾艺勤,等.粉煤灰对高性能混凝土抗压及抗氯离子侵蚀性能试验研究[J].混凝土与水泥制品,2016(9):10-14.
[9]谭业文,王曙光,刘伟庆,等.粉煤灰对混凝土抗氯盐侵蚀性能的影响[J].混凝土,2017(7):144-148.
[10]何智海,刘宝举.粉煤灰混凝土抗氯离子渗透性能的试验研究[J].粉煤灰综合利用,2007(4):24-27.
[11]王德志,陈振,孟云芳.氯盐冻融作用下粉煤灰混凝土抗渗抗冻性研究[J].人民黄河,2017,39(12):131-133,138.
[12]董刚.粉煤灰和矿渣在水泥浆体中的反应程度研究[D].北京:中国建筑材料科学研究总院,2008.
[13]金伟良,赵羽习.混凝土结构耐久性[M].北京:科学出版社,2014.
[14]方坤河,何真.建筑材料[M].7版.北京:中国水利水电出版社,2015.
[15]林紫东,郑瑜.海工钢筋混凝土耐久性译文集[M].全国水运工程标准技术委员会,1988.
[16]张武满,巴恒静,高小建,等.粉煤灰与应力水平对混凝土渗透性的影响[J].江苏大学学报(自然科学版),2008,29(4):356-359.
[17]吴中伟,廉慧珍.高性能混凝土[M].北京:中国铁道出版社,1999.
[18]张云升,孙伟,郑克仁,等.水泥-粉煤灰浆体的水化反应进程[J].东南大学学报(自然科学版),2006,36(1):118-123.