自密实系列混凝土基本力学性能试验研究
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摘要
为探究自密实系列混凝土基本力学性能,利用液压伺服机和材料直剪仪对普通混凝土、轻骨料混凝土、自密实普通混凝土和自密实轻骨料混凝土进行了受压、劈拉和纯剪试验研究,得到了不同加载工况下混凝土的破坏形态和力-变形曲线,通过提取力-变形曲线特征值(峰值应力、变形参数以及弹性模量),对比分析了自密实系列混凝土基本力学性能。结果表明:单轴受压工况下自密实系列混凝土主要为斜剪破坏形态,纯剪受力工况下,自密实系列混凝土受剪破坏断面相对较不平整且凹凸;自密实系列混凝土单轴受压应力-应变曲线表现出明显脆性特征,非自密实系列混凝土塑性变形能力较高,但劈拉应力-应变曲线和横向剪切荷载-位移曲线发展表现出明显脆性破坏特征;相同抗压强度混凝土配合比设计值,普通混凝土抗剪强度远低于轻骨料混凝土和自密实系列混凝土,同时自密实系列混凝土弹性模量和剪切模量高于非自密实系列混凝土。
In order to explore the basic mechanical properties of self-compacting concrete, the compressive tests,splitting tests and shear tests of ordinary concrete, lightweight aggregate concrete, self-compacting ordinary concrete and self-compacting lightweight aggregate concrete were carried out by means of hydraulic servo machine and material direct shear apparatus. The basic mechanical properties of self-compacting concrete were analyzed by extracting the characteristic values of force-deformation curve(peak stress, deformation parameters and elastic modulus). The main conclusions are as follows: in the uniaxial compression failure mode, the self-compacting concrete is mainly oblique shear failure mode, while in the pure shear state, the shear failure section of the self-compacting concrete is relatively uneven and concave; the uniaxial compression stress-strain curve shows that the self-compacting concrete is obvious. The non-self-compacting concrete has high plastic deformation capacity, but the splitting tensile stress-strain curve and shear transverse load-displacement curve are brittle failure characteristics. The shear strength of ordinary concrete is much lower than that of lightweight aggregate concrete and self-compacting concrete with the same mix ratio of compressive strength concrete. At the same time, the elastic modulus and shear modulus of self-compacting concrete are higher than those of non-self-compacting concrete.
In order to explore the basic mechanical properties of self-compacting concrete, the compressive tests,splitting tests and shear tests of ordinary concrete, lightweight aggregate concrete, self-compacting ordinary concrete and self-compacting lightweight aggregate concrete were carried out by means of hydraulic servo machine and material direct shear apparatus. The basic mechanical properties of self-compacting concrete were analyzed by extracting the characteristic values of force-deformation curve(peak stress, deformation parameters and elastic modulus). The main conclusions are as follows: in the uniaxial compression failure mode, the self-compacting concrete is mainly oblique shear failure mode, while in the pure shear state, the shear failure section of the self-compacting concrete is relatively uneven and concave; the uniaxial compression stress-strain curve shows that the self-compacting concrete is obvious. The non-self-compacting concrete has high plastic deformation capacity, but the splitting tensile stress-strain curve and shear transverse load-displacement curve are brittle failure characteristics. The shear strength of ordinary concrete is much lower than that of lightweight aggregate concrete and self-compacting concrete with the same mix ratio of compressive strength concrete. At the same time, the elastic modulus and shear modulus of self-compacting concrete are higher than those of non-self-compacting concrete.
引文
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[2]余振鹏,黄侨,任政.轻骨料混凝土局部受压试验及动力本构分析[J].哈尔滨工业大学学报,2018,50(3):18-25.
[3]董健苗,殷玲,马发林,等.剑麻纤维自密实轻骨料混凝土梁裂缝宽度试验研究[J].混凝土与水泥制品,2018(11):65-69.
[4] Okamura H,Ozawa K.Mix design for self-compacting concrete[J].Concrete library of JSCE,1995,25(6):107-120.
[5]陈建奎,王栋民.高性能混凝土(HPC)配合比设计新法—全计算法[J].硅酸盐学报,2000,28(2):194-198.
[6]张云国.自密实轻骨料混凝土性能研究[D].大连:大连理工大学,2009.
[7]董祥,祁兵.轻骨料施工预处理方法对高强轻骨料混凝土施工性能与长期强度的影响[J].水运工程,2009(3):164-168.
[8] Hwang C L,Hung M F.Durability design and performance of self-consolidating lightweight concrete[J].Construction&Building Materials,2005,19(8):619-626.
[9] lker Bekir Top u,Uyguno lu T.Effect of aggregate type on properties of hardened self-consolidating lightweight concrete(SCLC)[J].Construction&Building Materials,2010,24(7):1286-1295.
[10] Yu Z,Huang Q,Xie X,et al.Experimental study and failure criterion analysis of plain concrete under combined compression-shear stress[J].Construction&Building Materials,2018,179:198-206.
[11]潘金龙,何佶轩,王路平,等.ECC双轴压力学性能及破坏准则试验研究[J].工程力学,2016,33(6):186-193.
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