钢丝网-喷射UHTCC薄板抗弯性能试验研究
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摘要
喷射超高韧性水泥基复合材料(喷射UHTCC)具有显著的应变硬化和多缝开裂特性,但其抗拉和抗弯强度不高,因此工程中常常考虑与钢丝网组合使用。本文对喷射UHTCC、钢丝网喷射UHTCC和钢丝网复合砂浆的薄板试件分别进行了四点弯曲试验。其中,选取的钢丝网复合砂浆薄板直接拉伸的失稳破坏强度与喷射UHTCC薄板接近。试验表明,钢丝网喷射UHTCC薄板的抗弯强度和极限弯曲挠度分别比喷射UHTCC薄板提高了69.8%和59.0%,也比钢丝网复合砂浆薄板提高了3.9倍和73.3%。
Sprayed Ultra high toughness cementitious composites(UHTCC) can be still characterized by stain-hardening and multiple fine crack opening properties, but its tensile and flexural strength are not high enough to fulfill the high tensile or flexural strength requests in the repair and retrofitting for some special structures. Thus, steel wire gauze was introduced to reinforce sprayed UHTCC. Four-points bending tests were carried on a kind of steel wire gauze reinforced fine grained concrete(SRC), sprayed UHTCC(SU) and steel wire gauze reinforced sprayed UHTCC(SSU), respectively, and this kind of SRC possesses comparable failure tensile strength to SSU. The tests results indicate that the steel wire gauze reinforced sprayed UHTCC(SSU) possess 69.8% higher flexural strength and 59.0% higher mid-span deflection than sprayed UHTCC, respectively. Moreover, SSU has a 3.9 times of flexural strength and 73.3% of ultimate flexural deflection higher than SRC.
Sprayed Ultra high toughness cementitious composites(UHTCC) can be still characterized by stain-hardening and multiple fine crack opening properties, but its tensile and flexural strength are not high enough to fulfill the high tensile or flexural strength requests in the repair and retrofitting for some special structures. Thus, steel wire gauze was introduced to reinforce sprayed UHTCC. Four-points bending tests were carried on a kind of steel wire gauze reinforced fine grained concrete(SRC), sprayed UHTCC(SU) and steel wire gauze reinforced sprayed UHTCC(SSU), respectively, and this kind of SRC possesses comparable failure tensile strength to SSU. The tests results indicate that the steel wire gauze reinforced sprayed UHTCC(SSU) possess 69.8% higher flexural strength and 59.0% higher mid-span deflection than sprayed UHTCC, respectively. Moreover, SSU has a 3.9 times of flexural strength and 73.3% of ultimate flexural deflection higher than SRC.
引文
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[3]曾令宏,尚守平,彭晖.钢丝网复合砂浆加固混凝土梁抗弯刚度计算[J].湖南大学学报(自然科学版),2003,30(3):127―129.Zeng Linghong,Shang Shouping,Peng Hui.The calculation of concrete flexural stiffness strengthened with ferrocement[J].Journal of Hunan University(Natural Science),2003,30(3):127―129.(in Chinese)
[4]尚守平,曾令宏,彭晖.钢丝网复合砂浆加固混凝土受弯构件非线性分析[J].工程力学,2005,22(3):118―125.Shang Shouping,Zeng Linghong,Peng Hui.Nonlinear analysis of reinforced concrete beam strengthened with ferrocement[J].Engineering Mechanics,2005,22(03):118―125.(in Chinese)
[5]刘金伟,朱湛贤,李丰丰,等.钢筋钢丝网砂浆加固混凝土梁的抗弯试验研究[J].工程力学,2011,28(3):170―176.Liu Jinwei,Zhu Zhanxian,Li Fengfeng,et al..Experimental study on the flexural behavior of rc beams strengthened with steel bar/wire mesh mortar[J].Engineering Mechanics,2011,28(3):170―176.(in Chinese)
[6]朱江,赵国藩,李士恩.聚丙烯纤维增强钢丝网混凝土板抗弯性能试验研究[J].大连理工大学学报,2008,48(4):536―540.Zhu jiang,Zhao Guofan,Li Shien.Experimental research on flexural behavior of PFOC slabs[J].Journal of Dalian University of Technology,2008,48(4):536―540.(in Chinese)
[7]朱江,赵国藩,李士恩.配筋聚丙烯纤维增强钢丝网混凝土板抗弯承载力研究[J].混凝土,2008(1):1―3.Zhu jiang,Zhao Guofan,Li Shien.Study on the flexural bearing capacity of polypropylene fiber reinforced ferroconcrete s labs[J].Concrete,2008(1):1―3.(in Chinese)
[8]朱江,赵国藩,李士恩,等.纤维增强钢丝网混凝土的研究和工程应用[J].混凝土,2008(6):42―44.Zhu jiang,Zhao Guofan,Li Shien,et al.Research on fiber reinforced ferroconcrete and it s applicat ion[J].Concrete,2008(6):42―44.(in Chinese)
[9]周斌.超高韧性水泥基复合材料喷射性能及其结构基本应用的研究[D].杭州:浙江大学,2005.Zhou Bin.Research on the performance of sprayable UHTCC and its engineering application[D].Hangzhou:Zhejiang University,2015.(in Chinese)
[10]徐世烺,周斌,李庆华,等.喷射超高韧性水泥基复合材料的力学性能研究[J].水利学报,2015,46(5):619―625.Xu Shilang,Zhou Bin,Li Qinghua,et al.Mechanical performance of sprayable ultra high toughness cementitious composites[J].Journal of Hydraulic Engineering,2015,46(5):619―625.(in Chinese)
[11]Standard test method for flexural toughness and first-crack strength of fiber reinforced concrete.ASTM C1018,Standards for Concrete and Mineral Aggregates[S].United States:American Society for Testing Materials,ASTM;1997.
[12]Said S H,Razak H A,Othman I.Flexural behavior of engineered cementitious composite(ECC)slabs with polyvinyl alcohol fibers[J].Construction and Building Materials,2015,75(30):176―188.