冻融循环作用后橡胶混凝土与钢筋锚固性能试验研究
|
摘要
在混凝土中掺入橡胶粉制成橡胶混凝土,既可对废旧轮胎进行高附加值利用,又可提高混凝土的抗裂、耐磨、抗滑、减振、降噪等多方面路用性能。为研究冻融循环作用后橡胶混凝土与钢筋的锚固性能,采用钢筋开槽内贴应变片的方法,快速冻融后做中心拉拔试验,研究了冻融循环次数以及橡胶掺量对橡胶混凝土与钢筋锚固性能的影响。试验结果表明:掺入5%、10%的橡胶粉,有利于冻融循环作用后钢筋与混凝土间的锚固性能;未经冻融循环的橡胶混凝土试件与橡胶粉掺量为0%的试件相比,橡胶掺量为15%的混凝土试件极限粘结强度下降56%,而橡胶掺量为5%、10%的试件极限粘结强度几乎没有下降;冻融循环至125次,橡胶掺量为5%、10%、15%的混凝土试件粘结强度分别下降60%、58%、50%,与未掺橡胶混凝土粘结强度相比下降幅度减小了约8%。
Adding rubber powder to the concrete to make rubber concrete,which can be used for the high value of the old tires,but also to enhance the concrete 's anti-cracking,wear-resisting,anti-sliding,damping,and noise reduction,etc. In order to study the anchorage performance of rubber concrete and steel after freeze-thaw cycles,through pull-out test of steel bars with strain gauges attached inside,the effect of rubber content and the number of freeze-thaw cycles on the bond performance between steel bars and rubber concrete was analyzed. The results of the pull-out test with different influential parameters show that with 5% and 10% rubber powder,it is beneficial to the bond performance between steel bar and concrete. Without the freeze-thaw cycle of rubber concrete specimens,compared with the rubber powder content of 0% specimens,rubber content is 15% and specimen fell by 56% at the ultimate bond strengths,rubber content is 5% and 10% of the specimen has hardly fallen at the ultimate bond strengths. In the freezing and thawing cycle to 125 times,the bond strength of the concrete specimens with 5%,10%,and 15% of the rubber content decrease by 60%,58%,and 50% respectively,and the reduction of the adhesive strength of the unmixed concrete is reduced by 8%.
Adding rubber powder to the concrete to make rubber concrete,which can be used for the high value of the old tires,but also to enhance the concrete 's anti-cracking,wear-resisting,anti-sliding,damping,and noise reduction,etc. In order to study the anchorage performance of rubber concrete and steel after freeze-thaw cycles,through pull-out test of steel bars with strain gauges attached inside,the effect of rubber content and the number of freeze-thaw cycles on the bond performance between steel bars and rubber concrete was analyzed. The results of the pull-out test with different influential parameters show that with 5% and 10% rubber powder,it is beneficial to the bond performance between steel bar and concrete. Without the freeze-thaw cycle of rubber concrete specimens,compared with the rubber powder content of 0% specimens,rubber content is 15% and specimen fell by 56% at the ultimate bond strengths,rubber content is 5% and 10% of the specimen has hardly fallen at the ultimate bond strengths. In the freezing and thawing cycle to 125 times,the bond strength of the concrete specimens with 5%,10%,and 15% of the rubber content decrease by 60%,58%,and 50% respectively,and the reduction of the adhesive strength of the unmixed concrete is reduced by 8%.
引文
[1]王海进.废轮胎橡胶混凝土力学性能及抗冻性试验研究[D].北京:中国矿业大学,2017.
[2]刘建伟,张脩,申俊敏,等.水泥混凝土路面国内外现状和发展新对策[J].中外公路,2016,36(4):73-77.
[3]钱震,庄勇,方海,等.弹性混凝土在工程结构中的应用探讨[J].混凝土,2016(9):124-127.
[4]蓝兰.全国高速公路“十二五”回顾及“十三五”展望[J].交通建设与管理,2016(Z1):68-77.
[5]吉林省交通厅.公路工程抗冻设计与施工技术指南[M].北京:北京大学出版社出版,2006.
[6]周幼吾,邱国庆,程国栋,等.中国冻土[M].北京:科学出版社,2000.
[7]徐金花,冯夏庭,陈四利.橡胶集料对混凝土抗冻性的影响[J].东北大学学报(自然科学版),2012,33(6):895-898.
[8]朱方之,马志鸣,蒋连接,等.持载和冻融循环对钢筋混凝土粘结性能的影响[J].西安建筑科技大学学报(自然科学版),2016,48(5):643-647.
[9]许金余,李赞成,罗鑫.橡胶混凝土抗冻性的对比研究[J].硅酸盐通报,2014,33(4):800-805.
[10] Bisht K,Ramana P V. Evaluation of mechanical and durability properties of crumb rubber. concrete[J]. Construction and Building Materials,2017(155):811-817.
[11]刘春生,陈雷,朱涵.氯盐侵蚀环境下橡胶集料掺量对钢筋混凝土梁耐久性的影响[J].天津大学学报,2011,44(1):40-45.
[12] Gupta T,Tiwari A,Siddique S,et al. Response assessment under dynamic loading and microstructural investigations of rubberized concrete[J].Journal of Materials in Civil Engineering,2017,29(8):1-15.
[13]冀晓东,赵宁,宋玉普.冻融循环作用后变形钢筋与混凝土粘结性能退化研究[J].工业建筑,2010,40(1):87-91.
[14]刘斯凤,郭泗军,史翠平.多因素对钢筋混凝土握裹力的影响及回归模型[J].建筑材料学报,2016,19(1):162-165+203.
[2]刘建伟,张脩,申俊敏,等.水泥混凝土路面国内外现状和发展新对策[J].中外公路,2016,36(4):73-77.
[3]钱震,庄勇,方海,等.弹性混凝土在工程结构中的应用探讨[J].混凝土,2016(9):124-127.
[4]蓝兰.全国高速公路“十二五”回顾及“十三五”展望[J].交通建设与管理,2016(Z1):68-77.
[5]吉林省交通厅.公路工程抗冻设计与施工技术指南[M].北京:北京大学出版社出版,2006.
[6]周幼吾,邱国庆,程国栋,等.中国冻土[M].北京:科学出版社,2000.
[7]徐金花,冯夏庭,陈四利.橡胶集料对混凝土抗冻性的影响[J].东北大学学报(自然科学版),2012,33(6):895-898.
[8]朱方之,马志鸣,蒋连接,等.持载和冻融循环对钢筋混凝土粘结性能的影响[J].西安建筑科技大学学报(自然科学版),2016,48(5):643-647.
[9]许金余,李赞成,罗鑫.橡胶混凝土抗冻性的对比研究[J].硅酸盐通报,2014,33(4):800-805.
[10] Bisht K,Ramana P V. Evaluation of mechanical and durability properties of crumb rubber. concrete[J]. Construction and Building Materials,2017(155):811-817.
[11]刘春生,陈雷,朱涵.氯盐侵蚀环境下橡胶集料掺量对钢筋混凝土梁耐久性的影响[J].天津大学学报,2011,44(1):40-45.
[12] Gupta T,Tiwari A,Siddique S,et al. Response assessment under dynamic loading and microstructural investigations of rubberized concrete[J].Journal of Materials in Civil Engineering,2017,29(8):1-15.
[13]冀晓东,赵宁,宋玉普.冻融循环作用后变形钢筋与混凝土粘结性能退化研究[J].工业建筑,2010,40(1):87-91.
[14]刘斯凤,郭泗军,史翠平.多因素对钢筋混凝土握裹力的影响及回归模型[J].建筑材料学报,2016,19(1):162-165+203.