紫外线辐射及冻融循环双因素下面板混凝土力学性能研究
|
摘要
为了建立考虑紫外线辐射作用的混凝土冻融循环损伤模型,有必要弄清紫外线辐射与冻融循环相结合条件下对面板混凝土力学性能的影响。为此进行了紫外线辐射试验、冻融循环试验和混凝土抗弯强度试验,并对混凝土试件表面状况、质量损失率和抗弯强度进行了对比分析。试验结果表明:在一定冻融循环次数下,水灰比越大,质量损失率越大。相较于未经紫外线照射的对照组,经过紫外线照射的试件在经过一定循环次数的冻融后,其质量损失率更大。紫外线辐射对低强混凝土的质量损失率影响主要是在冻融循环的早期表现出来,而对高强混凝土则是在冻融循环的晚期表现出来。紫外线辐射对经受冻融循环后的混凝土抗弯性能没有明显的影响,在其他条件相同的情况下,水灰比越低,抗弯强度越高。
In order to establish the freeze-thaw cycle damage model of concrete under consideration of the effect of ultraviolet radiation,it is necessary to know the influence from the combination of ultraviolet radiation and freeze-thaw cycle on the mechanical properties of facing concrete. Therefore,the ultraviolet radiation experiment,freeze-thaw cycle experiment and concrete flexural strength experiment are carried out,and then the comparative analyses are made on the surface condition,mass loss rate and flexural strength of concrete specimens. The experiment result shows that under a certain number of freeze-thaw cycles,the larger the water-cement ratio is,the greater the mass loss rate is to be. Compared with the control group without the ultraviolet irradiation,the mass loss rates of the specimens through ultraviolet irradiation after certain freeze-thaw cycles are more greater. The effect of ultraviolet irradiation on the mass loss rate of low-strength concrete mainly exhibits in the early stage of the freeze-thaw cycle,while it is exhibited in the later stage of the freeze-thaw cycle for the high-strength concrete. There is no significant effect from ultraviolet irradiation on the flexural performance of the concrete after freeze-thaw cycle,for which the lower the water-cement ratio is,the flexural strength is to be higher under the other same conditions.
In order to establish the freeze-thaw cycle damage model of concrete under consideration of the effect of ultraviolet radiation,it is necessary to know the influence from the combination of ultraviolet radiation and freeze-thaw cycle on the mechanical properties of facing concrete. Therefore,the ultraviolet radiation experiment,freeze-thaw cycle experiment and concrete flexural strength experiment are carried out,and then the comparative analyses are made on the surface condition,mass loss rate and flexural strength of concrete specimens. The experiment result shows that under a certain number of freeze-thaw cycles,the larger the water-cement ratio is,the greater the mass loss rate is to be. Compared with the control group without the ultraviolet irradiation,the mass loss rates of the specimens through ultraviolet irradiation after certain freeze-thaw cycles are more greater. The effect of ultraviolet irradiation on the mass loss rate of low-strength concrete mainly exhibits in the early stage of the freeze-thaw cycle,while it is exhibited in the later stage of the freeze-thaw cycle for the high-strength concrete. There is no significant effect from ultraviolet irradiation on the flexural performance of the concrete after freeze-thaw cycle,for which the lower the water-cement ratio is,the flexural strength is to be higher under the other same conditions.
引文
[1]陈改新.混凝土耐久性的研究、应用和发展趋势[J].中国水利水电科学研究院学报,2009,7(2):280-285.
[2]兰浩.混凝土耐久性的提升措施分析[J].中小企业管理与科技(上旬刊),2016(12):172-173.
[3]郭峰.影响混凝土耐久性的因素及改善措施[J].四川水泥,2017(2):289-289.
[4]王成,葛广华,侯建国,等.南疆地区混凝土结构耐久性现状与影响因素研究[J].武汉大学学报(工学版),2017,50(3):447-453.
[5]冯乃谦,邢峰.混凝土与混凝土结构的耐久性[M].北京:机械工业出版社,2009.
[6]王志刚,李鑫,刘数华.紫外线辐射对水工混凝土耐久性影响研究与展望[J].水力发电,2013,39(5):46-47.
[7]房志华,谢殿华,白金.混凝土冻融破坏机理及影响混凝土抗冻性能的主要因素[J].内蒙古水利,2012(5):156-157.
[8]陈翔.提升混凝土桥梁耐久性研究[D].北京:北京交通大学,2010.
[9]王场,王健.施工期混凝土材料特性对其后期耐久性能影响[J].交通世界,2017(16):132-133,151.
[10]卢木.混凝土耐久性研究现状和研究方向[J].工业建筑,1997,27(5):1-6,52.
[11]邸澎涛.浅析混凝土冻融破坏及治理措施[J].中国集体经济,2014(4):85-86.
[12]杨鹏飞.不同类型的水对混凝土冻融破坏的影响[J].科技创新与应用,2013(20):239.
[13]苑立冬,牛荻涛,姜磊,等.硫酸盐侵蚀与冻融循环共同作用下混凝土损伤研究[J].硅酸盐通报,2013,32(6):1171-1176.
[14]刘旭峰.冻融循环后混凝土抗压性能与短柱轴压性能研究[D].沈阳:沈阳建筑大学,2012.
[15]邢凯.冻融循环下混凝土力学性能试验及损伤演化研究[D].西安:长安大学,2015.
[16]郑元勋,杨培冰,康海贵.冻融环境下混凝土结构耐久性研究综述[J].郑州大学学报(工学版),2016,37(5):27-32.
[17]中华人民共和国住房和城乡建设部.普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082—2009[S].北京:中国建筑工业出版社,2009.
[18]洪锦祥,缪昌文,刘加平,等.冻融损伤混凝土力学性能衰减规律[J].建筑材料学报,2012,15(2):173-178.
[19]王国业,王亮,王凤池,等.基于灰色理论的混凝土梁冻融后质量损失率预测[J].沈阳建筑大学学报(自然科学版),2014,30(3):436-441.
[20]毛明杰,杨秋宁.大掺量粉煤灰混凝土抗弯强度试验误差的研究[J].混凝土,2014(1):9-11.
[21]高矗,申向东,王萧萧,等.应力损伤轻骨料混凝土抗冻融性能[J].硅酸盐学报,2014,42(10):1247-1252.
[2]兰浩.混凝土耐久性的提升措施分析[J].中小企业管理与科技(上旬刊),2016(12):172-173.
[3]郭峰.影响混凝土耐久性的因素及改善措施[J].四川水泥,2017(2):289-289.
[4]王成,葛广华,侯建国,等.南疆地区混凝土结构耐久性现状与影响因素研究[J].武汉大学学报(工学版),2017,50(3):447-453.
[5]冯乃谦,邢峰.混凝土与混凝土结构的耐久性[M].北京:机械工业出版社,2009.
[6]王志刚,李鑫,刘数华.紫外线辐射对水工混凝土耐久性影响研究与展望[J].水力发电,2013,39(5):46-47.
[7]房志华,谢殿华,白金.混凝土冻融破坏机理及影响混凝土抗冻性能的主要因素[J].内蒙古水利,2012(5):156-157.
[8]陈翔.提升混凝土桥梁耐久性研究[D].北京:北京交通大学,2010.
[9]王场,王健.施工期混凝土材料特性对其后期耐久性能影响[J].交通世界,2017(16):132-133,151.
[10]卢木.混凝土耐久性研究现状和研究方向[J].工业建筑,1997,27(5):1-6,52.
[11]邸澎涛.浅析混凝土冻融破坏及治理措施[J].中国集体经济,2014(4):85-86.
[12]杨鹏飞.不同类型的水对混凝土冻融破坏的影响[J].科技创新与应用,2013(20):239.
[13]苑立冬,牛荻涛,姜磊,等.硫酸盐侵蚀与冻融循环共同作用下混凝土损伤研究[J].硅酸盐通报,2013,32(6):1171-1176.
[14]刘旭峰.冻融循环后混凝土抗压性能与短柱轴压性能研究[D].沈阳:沈阳建筑大学,2012.
[15]邢凯.冻融循环下混凝土力学性能试验及损伤演化研究[D].西安:长安大学,2015.
[16]郑元勋,杨培冰,康海贵.冻融环境下混凝土结构耐久性研究综述[J].郑州大学学报(工学版),2016,37(5):27-32.
[17]中华人民共和国住房和城乡建设部.普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082—2009[S].北京:中国建筑工业出版社,2009.
[18]洪锦祥,缪昌文,刘加平,等.冻融损伤混凝土力学性能衰减规律[J].建筑材料学报,2012,15(2):173-178.
[19]王国业,王亮,王凤池,等.基于灰色理论的混凝土梁冻融后质量损失率预测[J].沈阳建筑大学学报(自然科学版),2014,30(3):436-441.
[20]毛明杰,杨秋宁.大掺量粉煤灰混凝土抗弯强度试验误差的研究[J].混凝土,2014(1):9-11.
[21]高矗,申向东,王萧萧,等.应力损伤轻骨料混凝土抗冻融性能[J].硅酸盐学报,2014,42(10):1247-1252.