不同自密实轻骨料混凝土的强度及耐久性能影响因素分析
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摘要
为了兼顾全轻和普通自密实混凝土的优点,以LC30级全轻自密实混凝土为基准,通过河砂、碎石按等体积取代率以单独和同时取代部分陶砂、陶粒方法,形成相应的砂轻、石轻和混轻自密实混凝土,再依次进行特征强度、弹性模量、干表观密度和碳化、氯离子渗透和硫酸盐侵蚀性能试验。结果表明,河砂、碎石单独取代时均能提高混凝土的特征强度和比强度,并分别在20%、25%时达到最大值,而弹性模量则一直增大且砂轻自密实混凝土较大,但在同时取代时,比强度和弹性模量在河砂取代率降为15%时达到最大值;河砂、碎石单掺时的碳化深度几乎均随取代率增大而减小且二者相近,混掺时虽有所增大但差别也不大;河砂、碎石单掺时的抗氯离子渗透和硫酸盐侵蚀性能均随取代率增大呈先增大后减小趋势,混掺时则在相同河砂取代率时随碎石取代率增大而降低,且最佳值均与上述不同。
To combine the merits of self-compacting all-lightweight concrete (SCALWC) and selfcompacting normal weight concrete (SCNWC), the parts of shale pottery and shale ceramsite in SCALWC were replaced by river sand and gravel (Normal fine/coarse aggregate,NFA/NCA) in single and double patterns and in equal volume rate substitution based on SCALWC for LC30,respectively. The new concretes were formed correspondingly,which were self-compacting lightweight concrete substituted by part of fine aggregate (SCLWCSFA),self-compacting lightweight concrete substituted by part of coarse aggregate (SCLWCSCA) and self-compacting hybrid lightweight concrete (SCHLWC),respectively. The tests of characteristic strengths (Including cubic compression strength, axial compression strength and splitting tensile strength),elastic modulus,dry apparent density,carbonization depth,chloride ion penetration and sulfate attack were carried out. The results show that both characteristic strengths and specific strength (Cubic compression strength-to-dry apparent density ratio,SS) are growing larger first and then decrease with increase of NFA or NCA,and the best replacement ratio is 20% and 25%,respectively. But the elastic modulus is only increase,and the SCLWCSFA's is bigger than the SCLWCSCA's. The best substitute rate of NFA dropped to 15% for elastic modulus and SS when replaced by double. The carbonization depth decreases whenever increasing NFA or NCA,but the results are very close. The carbonization depth is little bigger than the former when replaced by double,and the results are fairly near. The chloride ion permeation and sulfate resistance property increase first and then decrease with increase of NFA or NCA. But the SCHLWC's decrease with increase of NCA when substitute rate of NFA is same,and the optimum ratios are different from the above.
To combine the merits of self-compacting all-lightweight concrete (SCALWC) and selfcompacting normal weight concrete (SCNWC), the parts of shale pottery and shale ceramsite in SCALWC were replaced by river sand and gravel (Normal fine/coarse aggregate,NFA/NCA) in single and double patterns and in equal volume rate substitution based on SCALWC for LC30,respectively. The new concretes were formed correspondingly,which were self-compacting lightweight concrete substituted by part of fine aggregate (SCLWCSFA),self-compacting lightweight concrete substituted by part of coarse aggregate (SCLWCSCA) and self-compacting hybrid lightweight concrete (SCHLWC),respectively. The tests of characteristic strengths (Including cubic compression strength, axial compression strength and splitting tensile strength),elastic modulus,dry apparent density,carbonization depth,chloride ion penetration and sulfate attack were carried out. The results show that both characteristic strengths and specific strength (Cubic compression strength-to-dry apparent density ratio,SS) are growing larger first and then decrease with increase of NFA or NCA,and the best replacement ratio is 20% and 25%,respectively. But the elastic modulus is only increase,and the SCLWCSFA's is bigger than the SCLWCSCA's. The best substitute rate of NFA dropped to 15% for elastic modulus and SS when replaced by double. The carbonization depth decreases whenever increasing NFA or NCA,but the results are very close. The carbonization depth is little bigger than the former when replaced by double,and the results are fairly near. The chloride ion permeation and sulfate resistance property increase first and then decrease with increase of NFA or NCA. But the SCHLWC's decrease with increase of NCA when substitute rate of NFA is same,and the optimum ratios are different from the above.
引文
[1]黄维蓉,刘贞鹏,张忠明,等.自密实混凝土的特点及性能研究综述[J].混凝土,2014(1):108-110.
[2]Bensebti S E,Aggoun S,Kadri E H,et al.Experimental test for evaluation of SCC static segregation[A].International Conference on Advanced Material and Manufacturing Science[C].Beijing,2014:68-72.
[3]张勇,赵庆新,李化建,等.自密实混凝土基本工作性能与其静态稳定性间的关系[J].硅酸盐学报,2016,44(2):261-267.
[4]黄维蓉,刘贞鹏,张忠明,等.自密实混凝土的特点及性能研究综述[J].混凝土,2014(1):108-110.
[5]Li L,Huang C.Analysis on the stress-strain behavior of self consolidating concrete[A].Proceedings of 1st International Symposium on Design,Performance and Use of Self-Consolidating Concrete[C].Paris,2005:517-522.
[6]齐永顺,杨玉红.自密实混凝土的研究现状分析及展望[J].混凝土,2007(1):27-28.
[7]杨玉红,李悦,杜修力.自密实混凝土早期自收缩及微观孔结构研究[J].建筑材料学报,2010,13(5),601-602.
[8]晁鹏飞,郑建岚.自密实混凝土徐变性能试验研究[J].建筑结构学报,2010,31(2):101-103.
[9]刘喜,吕贝贝,刘全威,等.高强轻骨料陶粒混凝土配合比及强度影响因素试验研究[J].硅酸盐通报,2014,33(4):847-852.
[10]高英力,刘赫,张海伦,等.高强轻骨料混凝土拌合物性能及影响因素试验研究[J].硅酸盐通报,2013,32(4):560-565.
[11]杨健辉,张庆兵,余建雨,等.半轻混凝土的物理力学性能变化规律试验研究[J].混凝土,2016(6):2-5.
[12]王振军,张思宇,薛军鹏,等.自密实轻骨料混凝土耐久性能研究[J].南昌大学学报(工科版),2006,28(2):197-200.
[13]王磊.自密实轻骨料混凝土性能研究[D].哈尔滨:哈尔滨工业大学,2015:47-51.
[14]张玉,刘伯权,吴涛,等.高强页岩轻骨料混凝土配合比与微观结构研究[J].西安建筑科技大学学报(自然科学版),2018,50(2):228-231.
[15]Zhang M H,Giorvoe.Microstructure of the interfacial zone between lightweight aggregate and cement paste[J].Cement and Concrete Research,1990,20(4):612-618.
[16]Gesoglu,Mehmet,Ozturan.Self-consolidating characteristies of concrete composites including rounded fine and coarse fly ash lightweight aggregates[J].Composites Part B:Engineering,2014,60(4):757-763.
[17]杨健辉,徐璐,樊晓,等.石轻页岩陶粒混凝土的强度试验研究[J].混凝土,2015(3):85-86.
[18]杨健辉,陈静,张鹏,等.全轻页岩陶粒混凝土的强度影响因素[J].河南理工大学学报(自然科学版),2014,33(5):668-669.
[19]张哲.陶粒对混凝土物理力学性能与耐久性能的改善效果[D].焦作:河南理工大学,2017:19-24.
[20]李洋.混凝土碳化深度模型及其影响因素研究[D].阜新:辽宁工程技术大学,2015:9-12.
[21]李国宇.自密实混合骨料混凝土力学性能及耐久性能研究[D].保定:河北农业大学,2013:13-19,52-57.
[22]Junco C,Gadea J.Durability of lightweight masonry mortars made with white recycled polyurethane foam[J].Cement&Concrete Composites,2012,34:1174-1179.
[2]Bensebti S E,Aggoun S,Kadri E H,et al.Experimental test for evaluation of SCC static segregation[A].International Conference on Advanced Material and Manufacturing Science[C].Beijing,2014:68-72.
[3]张勇,赵庆新,李化建,等.自密实混凝土基本工作性能与其静态稳定性间的关系[J].硅酸盐学报,2016,44(2):261-267.
[4]黄维蓉,刘贞鹏,张忠明,等.自密实混凝土的特点及性能研究综述[J].混凝土,2014(1):108-110.
[5]Li L,Huang C.Analysis on the stress-strain behavior of self consolidating concrete[A].Proceedings of 1st International Symposium on Design,Performance and Use of Self-Consolidating Concrete[C].Paris,2005:517-522.
[6]齐永顺,杨玉红.自密实混凝土的研究现状分析及展望[J].混凝土,2007(1):27-28.
[7]杨玉红,李悦,杜修力.自密实混凝土早期自收缩及微观孔结构研究[J].建筑材料学报,2010,13(5),601-602.
[8]晁鹏飞,郑建岚.自密实混凝土徐变性能试验研究[J].建筑结构学报,2010,31(2):101-103.
[9]刘喜,吕贝贝,刘全威,等.高强轻骨料陶粒混凝土配合比及强度影响因素试验研究[J].硅酸盐通报,2014,33(4):847-852.
[10]高英力,刘赫,张海伦,等.高强轻骨料混凝土拌合物性能及影响因素试验研究[J].硅酸盐通报,2013,32(4):560-565.
[11]杨健辉,张庆兵,余建雨,等.半轻混凝土的物理力学性能变化规律试验研究[J].混凝土,2016(6):2-5.
[12]王振军,张思宇,薛军鹏,等.自密实轻骨料混凝土耐久性能研究[J].南昌大学学报(工科版),2006,28(2):197-200.
[13]王磊.自密实轻骨料混凝土性能研究[D].哈尔滨:哈尔滨工业大学,2015:47-51.
[14]张玉,刘伯权,吴涛,等.高强页岩轻骨料混凝土配合比与微观结构研究[J].西安建筑科技大学学报(自然科学版),2018,50(2):228-231.
[15]Zhang M H,Giorvoe.Microstructure of the interfacial zone between lightweight aggregate and cement paste[J].Cement and Concrete Research,1990,20(4):612-618.
[16]Gesoglu,Mehmet,Ozturan.Self-consolidating characteristies of concrete composites including rounded fine and coarse fly ash lightweight aggregates[J].Composites Part B:Engineering,2014,60(4):757-763.
[17]杨健辉,徐璐,樊晓,等.石轻页岩陶粒混凝土的强度试验研究[J].混凝土,2015(3):85-86.
[18]杨健辉,陈静,张鹏,等.全轻页岩陶粒混凝土的强度影响因素[J].河南理工大学学报(自然科学版),2014,33(5):668-669.
[19]张哲.陶粒对混凝土物理力学性能与耐久性能的改善效果[D].焦作:河南理工大学,2017:19-24.
[20]李洋.混凝土碳化深度模型及其影响因素研究[D].阜新:辽宁工程技术大学,2015:9-12.
[21]李国宇.自密实混合骨料混凝土力学性能及耐久性能研究[D].保定:河北农业大学,2013:13-19,52-57.
[22]Junco C,Gadea J.Durability of lightweight masonry mortars made with white recycled polyurethane foam[J].Cement&Concrete Composites,2012,34:1174-1179.
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