高丹盈^1,2, 陈嘉伟¹, 王一泓¹
AuthorsHTML:高丹盈^1,2, 陈嘉伟¹, 王一泓¹
AuthorsListE:Gao Danying^1,2, Chen Jiawei¹, Wang Yihong¹
AuthorsHTMLE:Gao Danying^1,2, Chen Jiawei¹, Wang Yihong¹
Unit:1. 郑州大学土木工程学院，郑州 450001；2. 河南工程学院土木工程学院，郑州 451191
Unit_EngLish:1．School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
2．School of Civil Engineering, Henan University of Engineering, Zhengzhou 451191, China
Abstract_Chinese:纤维纳米改性橡胶混凝土(SFNS-CRC)是一种新型环保高性能混凝土, 通过对其标准立方体试件高温中力学性能试验, 探究温度、钢纤维体积率和纳米二氧化硅掺量对该种新型改性橡胶混凝土抗压和劈裂抗拉强度的影响．选用橡胶体积掺量为10% 的橡胶混凝土, 在此基础上考虑了4种不同钢纤维体积率(0 、0.5% 、1.0% 、1.5% ), 3种不同纳米二氧化硅掺量(0、1% 、2% )和4种不同温度(20 ℃(室温)、200 ℃、400 ℃和600 ℃)．抗压和劈拉性能试验在实验室自行研制的混凝土材料高温中力学性能抗压和劈拉试验机上进行．试验分析了试件的破坏形态、高温中质量损失、试件抗压和劈裂抗拉强度的变化及破坏机理．研究结果表明：钢纤维和纳米二氧化硅对橡胶混凝土高温中力学性能改性效果较为理想, 同时使橡胶混凝土高温中的破坏形态得到极大改善, 试块完整性更好, 趋于延性破坏; 高温中SFNS-CRC抗压和劈裂抗拉强度提高显著, 且后者提高更加明显; 随钢纤维掺量增加, 高温中试件强度逐渐提高; 纳米二氧化硅最佳掺量为1% ．
Abstract_English:Steel fibers and nano-silica modified crumb rubber concrete(SFNS-CRC)is a new type of environment-friendly high performance concrete. The effects of temperature，steel fiber volume ratio and nano-silica content on the compressive and splitting tensile strengths of SFNS-CRC were investigated through the mechanical property tests on standard cubic specimens subjected to elevated temperatures. The crumb rubber concrete with 10% rubber content was chosen here. Four different steel fiber volume ratios(0，0.5%，1.0%，1.5%)，three different nano-silica contents (0，1%，2%) and four different temperatures((20 ℃(room temperature)，200 ℃，400 ℃ and 600 ℃)were considered. Compressive and splitting tensile tests were carried out on the compressive and splitting tensile mechanical properties testing machines subjected to elevated temperatures invented by our laboratory. The failure modes，the mass loss at high temperatures，the change of compressive and splitting tensile strengths and the failure mechanism were analyzed. Test results show that the modified effect of mechanical properties of crumb rubber concrete with steel fiber and nano-silica is preferable. The failure modes of CRC subjected to elevated temperatures are greatly improved and tend to present ductile modes. The integrity of specimens is better. The compressive and splitting tensile strengths of SFNS-CRC subjected to elevated temperatures are obviously improved，and the latter is more obvious. As the steel fiber content increases，the strength of specimen gradually increases at high temperatures. The optimal dosage of nano-silica is 1%.
Keyword_Chinese:钢纤维; 纳米二氧化硅; SFNS-CRC; 抗压强度; 劈裂抗拉强度; 失效机制
Keywords_English:steel fiber; nano-silica; SFNS-CRC; compressive strength; splitting tensile strength; failure mechanism

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