改性橡胶再生混凝土力学及疲劳性能试验
发布时间：2018-08-16 11:54
【摘要】：改性橡胶再生混凝土(Modified rubber recycled concrete)是在普通混凝土中加入经改性的橡胶颗粒并用再生粗骨料来代替部分或全部粗骨料的新型复合材料。它不但具有普通混凝土的强度高,耐久性好等优良特点,而且还可以提高混凝土的抗冲击性能、疲劳性能和韧性。最近几年,橡胶再生混凝土得到了深入广泛地研究和应用,根据国内外对橡胶再生混凝土的已有研究,本文对改性橡胶再生混凝土的力学及疲劳性能进行了试验。本文以C40混凝土为基准,对改性橡胶再生混凝土试件进行了力学性能试验,研究了改性方式、橡胶颗粒掺量对混凝土力学性能的影响规律及破坏机理。对改性橡胶再生混凝土小梁进行了疲劳性能试验,分析了应力水平、改性方式、橡胶颗粒掺量对疲劳性能的影响规律。试验结果表明:随着橡胶取代率的提高,混凝土试件的立方体抗压强度、劈裂抗拉强度、抗折强度、轴心抗压强度和弹性模量等力学性能呈降低趋势,但挠度、疲劳寿命、疲劳应变和残余应变有很大的提高;两种改性方式都能提高混凝土的力学性能、挠度、疲劳寿命和应变,但碱洗改性要优于酸洗改性,提高程度基本在20%以内。
[Abstract]:Modified rubber recycled concrete (Modified rubber recycled concrete) is a new type of composite material, in which modified rubber particles are added to ordinary concrete and recycled coarse aggregate is used to replace some or all coarse aggregate. It not only has high strength and good durability of ordinary concrete, but also can improve the impact resistance, fatigue performance and toughness of concrete. In recent years, rubber recycled concrete has been widely studied and applied. According to the existing research on rubber recycled concrete at home and abroad, the mechanical and fatigue properties of modified rubber recycled concrete have been tested in this paper. Based on C40 concrete, the mechanical properties of modified rubber recycled concrete were tested, and the influence of modification mode and rubber particle content on the mechanical properties of concrete and its failure mechanism were studied. The fatigue properties of modified rubber recycled concrete trabeculae were tested. The influence of stress level, modification method and rubber particle content on fatigue performance was analyzed. The experimental results show that the cube compressive strength, splitting tensile strength, flexural strength, axial compressive strength and elastic modulus of concrete specimens decrease with the increase of rubber replacement ratio, but the deflection, fatigue life, etc. The mechanical properties, deflection, fatigue life and strain of concrete can be improved by the two modification methods, but the alkali washing modification is better than acid pickling modification, and the degree of improvement is less than 20%.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528
[Abstract]:Modified rubber recycled concrete (Modified rubber recycled concrete) is a new type of composite material, in which modified rubber particles are added to ordinary concrete and recycled coarse aggregate is used to replace some or all coarse aggregate. It not only has high strength and good durability of ordinary concrete, but also can improve the impact resistance, fatigue performance and toughness of concrete. In recent years, rubber recycled concrete has been widely studied and applied. According to the existing research on rubber recycled concrete at home and abroad, the mechanical and fatigue properties of modified rubber recycled concrete have been tested in this paper. Based on C40 concrete, the mechanical properties of modified rubber recycled concrete were tested, and the influence of modification mode and rubber particle content on the mechanical properties of concrete and its failure mechanism were studied. The fatigue properties of modified rubber recycled concrete trabeculae were tested. The influence of stress level, modification method and rubber particle content on fatigue performance was analyzed. The experimental results show that the cube compressive strength, splitting tensile strength, flexural strength, axial compressive strength and elastic modulus of concrete specimens decrease with the increase of rubber replacement ratio, but the deflection, fatigue life, etc. The mechanical properties, deflection, fatigue life and strain of concrete can be improved by the two modification methods, but the alkali washing modification is better than acid pickling modification, and the degree of improvement is less than 20%.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528
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