不同介域环境下轻质发泡混凝土冻融损伤性能研究
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摘要
为研究不同冻融环境下轻质发泡混凝土的抗冻性能,将该轻质发泡混凝土分别在空气、水溶液、NaCl溶液三种不同介域环境下进行冻融循环试验,分析三种不同介域环境条件下这种轻质发泡混凝土冻融循环后的质量损失和抗压强度损失。研究表明:该种轻质发泡混凝土在空气冻融循环后,质量减小,抗压强度减小;在水溶液和NaCl溶液冻融循环后,质量增大,抗压强度减小。对三种不同介域环境条件下轻质发泡混凝土冻融循环后的表观和微观进行观察,并运用XRD进行分析。观察分析表明:轻质发泡混凝土在空气冻融循环和水溶液冻融循环后,没有明显生成物析出;在NaCl溶液冻融循环后有Na_2SO_4晶体析出,这种"晶体"为物理反应所产生。以上研究为今后轻质发泡混凝土在冻融环境条件下使用提供了理论依据。
To study the anti-frost property of a type of foamed lightweight concrete in different freezingthawing conditions,the freeze-thaw cycle experiment was conducted on the foamed lightweight concrete in three different conditions: air,aqueous solution and Na Cl solution. The purpose was to analyze the loss of mass and compressive strength of the foamed lightweight concrete after freeze-thaw cycle. Research indicates: after the freeze-thaw cycle in the air,mass and compressive strength of the foamed lightweight concrete both decrease. After the freeze-thaw cycle in aqueous solution and NaCl solution,the mass increases while compressive strength decreases. Observation and XRD analysis are also carried out on the manifestations and microcosmic structures of the foamed lightweight concrete after the freeze-thaw cycle in three different conditions. Analysis indicates: foamed lightweight concrete doesn't separate out obvious product after freeze-thaw cycle in the air and aqueous solution. In contrast,after the freezing and thawing cycle of NaCl solution Na_2SO_4 crystal is precipitated,which is generated by physical reaction. This analysis provides theoretical basis for the utilization of the foamed lightweight concrete in freezing-thawing conditions.
To study the anti-frost property of a type of foamed lightweight concrete in different freezingthawing conditions,the freeze-thaw cycle experiment was conducted on the foamed lightweight concrete in three different conditions: air,aqueous solution and Na Cl solution. The purpose was to analyze the loss of mass and compressive strength of the foamed lightweight concrete after freeze-thaw cycle. Research indicates: after the freeze-thaw cycle in the air,mass and compressive strength of the foamed lightweight concrete both decrease. After the freeze-thaw cycle in aqueous solution and NaCl solution,the mass increases while compressive strength decreases. Observation and XRD analysis are also carried out on the manifestations and microcosmic structures of the foamed lightweight concrete after the freeze-thaw cycle in three different conditions. Analysis indicates: foamed lightweight concrete doesn't separate out obvious product after freeze-thaw cycle in the air and aqueous solution. In contrast,after the freezing and thawing cycle of NaCl solution Na_2SO_4 crystal is precipitated,which is generated by physical reaction. This analysis provides theoretical basis for the utilization of the foamed lightweight concrete in freezing-thawing conditions.
引文
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[14]徐亚丁,王玲,王振地.混凝土冻融/盐冻破坏现象、机理和试验方法[J].硅酸盐通报,2017,36(2):491-496+514.
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[16]冯扣宝,王路明,蒋蕾,等.超轻水泥基发泡混凝土抗冻融性能试验研究[J].混凝土,2015(12):38-42.
[2]刘国玉.达坂山公路隧道冻土工程问题和工程防治措施[J].冰川冻土,2006(6):833-837.
[3]闫振甲.发泡混凝土发展状况与发展趋势[J].混凝土世界,2009(11):48-55.
[4] Md Azree O,Wang Y C. Elevated-temperature thermal properties of lightweight foamed concrete[J]. Construction and Building Materials,2010,25(2):705-716.
[5]刘军,崔云鹏,杨元全,等.粉煤灰发泡混凝土力学性能的研究[J].材料导报,2014,28(8):139-142.
[6]翟红侠,杨启安,廖绍锋,等.聚丙烯纤维增强发泡混凝土性能研究[J].安徽建筑大学学报,2016,24(02):82-86.
[7]徐丽娜,赵君超,张萌,等.锆硅渣在发泡混凝土制备中的作用及机理研究[J].新型建筑材料,2016,43(12):80-83.
[8]武海荣,金伟良,张锋剑,等.关注环境作用的混凝土冻融损伤特性研究进展[J].土木工程学报,2018,51(8):37-46.
[9]董方园,郑山锁,宋明辰,等.高性能混凝土研究进展Ⅱ:耐久性能及寿命预测模型[J].材料导报,2018,32(3):496-502+509.
[10]姚贤华,冯忠居,王富春,等.复合盐浸下多元外掺剂-混凝土抗干湿-冻融循环性能[J].复合材料学报,2018,35(3):690-698.
[11]钱涛,岑国平,张严,等.高寒环境下掺外加剂水泥混凝土抗冻融性能研究[J].混凝土,2011(12):83-87.
[12] Wawrzeńczyk J,Juszczak T,Molendowska A. Effect of binder composition on the structure of cement paste and on physical properties and freezethaw resistance of concrete[J]. Procedia Engineering,2016,161:73-78.
[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]徐亚丁,王玲,王振地.混凝土冻融/盐冻破坏现象、机理和试验方法[J].硅酸盐通报,2017,36(2):491-496+514.
[15]陈品明,曾嵘,卞绍洋,等.路用发泡混凝土长期耐久性研究[J].新型建筑材料,2018,45(7):33-36.
[16]冯扣宝,王路明,蒋蕾,等.超轻水泥基发泡混凝土抗冻融性能试验研究[J].混凝土,2015(12):38-42.