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不同损伤程度下橡胶改性再生骨料混凝土的阻尼特性

梁超锋,  傅洋燕,  赵江霞,  高越青,  王春晖

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文章导航 > 工业建筑  > 2022 >  52(8): 194-200,146
曹秀娟, 刘开富, 谢新宇, 刘一林. 深厚软土地基沉桩挤土效应防治及现场监测[J]. 工业建筑, 2004, 34(6): 55-57. doi: 10.13204/j.gyjz200406018
引用本文: 梁超锋, 傅洋燕, 赵江霞, 高越青, 王春晖. 不同损伤程度下橡胶改性再生骨料混凝土的阻尼特性[J]. 工业建筑, 2022, 52(8): 194-200,146. doi: 10.13204/j.gyjzG21111009
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Citation: LIANG Chaofeng, FU Yangyan, ZHAO Jiangxia, GAO Yueqing, WANG Chunhui. Damping Properties of Rubber Modified Recycled Aggregate Concrete Subjected to Different Damage Degrees[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(8): 194-200,146. doi: 10.13204/j.gyjzG21111009
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不同损伤程度下橡胶改性再生骨料混凝土的阻尼特性

doi: 10.13204/j.gyjzG21111009

  • 1. 绍兴文理学院土木工程学院, 浙江绍兴 312000;

  • 2. 哈尔滨工业大学(深圳)土木与环境工程学院, 广东深圳 518055

基金项目: 

住房与城乡建设部科技研发项目(2021-K-123)。

浙江省自然科学基金项目(LY20E080012,LGF22E080035)

详细信息
    作者简介:

    梁超锋,男,1980年出生,教授,硕士生导师。

    通讯作者:

    高越青,女,1988年出生,博士,硕士生导师,gaoyueqing@usx.edu.cn。

Damping Properties of Rubber Modified Recycled Aggregate Concrete Subjected to Different Damage Degrees

  • 1. School of Civil Engineering, Shaoxing University, Shaoxing 312000, China;

  • 2. School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China

摘要

    摘要
  • 摘要: 资源化利用废旧轮胎制备的再生橡胶颗粒和废弃混凝土制备的再生骨料是建筑材料可持续发展的重要途径之一。橡胶改性显著影响再生骨料混凝土(RAC)的阻尼特性和损伤发展。考虑橡胶取代率、硅烷偶联剂和消泡剂等因素影响,采用悬挂自由振动法,测试橡胶改性再生骨料混凝土(RRAC)经历不同应力幅值单轴受压循环加载后的一阶固有频率和阻尼比,定量评价其动态弹性模量和耗散模量,揭示RRAC阻尼特性随损伤指数的演变规律。研究结果表明:无损伤状态下,随橡胶取代率增加,RRAC一阶阻尼比增加10.2%~30.6%,动态弹性模量降低4.2%~22.0%;而硅烷偶联剂浸泡预处理橡胶颗粒及外掺消泡剂可提高RRAC动态弹性模量5.1%~21.0%,但其一阶阻尼比降低7.1%~17.2%。RRAC损伤指数随应力幅增加先快后慢地增加,与RAC变化趋势相反,且高于RAC损伤指数,这归因于橡胶颗粒的薄弱界面;RRAC一阶阻尼比随损伤指数增加呈线性增大。10%橡胶掺量可同时提高RRAC一阶阻尼比和耗散模量,增加RRAC的耗能能力。
    Abstract: Utilizing recycled rubber particles prepared from waste tires and recycled aggregates crushed from waste concrete is one of the important ways for the sustainable development of building materials. Incorporation of rubber modification significantly affects the damping characteristics and damage development of recycled aggregate concrete (RAC). Considering the effect of rubber replacement ratio by volume, silane coupling agent and defoamer, the first-order natural frequency and damping ratio of rubber modified recycled aggregate concrete (RRAC) subjected to cyclic loadings with different stress amplitudes were measured by suspension free vibration method, and its dynamic elastic modulus and loss modulus were quantitatively evaluated with the recorded data. The evolution of RRAC damping characteristics with damage index was revealed. The results showed that the first-order damping ratio of RRAC at the elastic stage increases by 10.2% to 30.6% with the increasing of rubber replacement ratio, while the dynamic elastic modulus decreased by 4.2% to 22.0%. The Presoaking of rubber particles with silane coupling agent and the addition of defoamer increased the dynamic elastic modulus of RRAC by 5.1% to 21.0%, but reduced the first-order damping ratio of RRAC by 7.1% to 17.2%. The damage index of RRAC increased rapidly first then slowly with increasing stress amplitude, which was opposite to that of RAC, and the damage index of RRAC was larger than that of RAC. This was mainly attributed to the weak interface of the rubber particles. Besides, the first-order damping ratio of RRAC increased linearly with the increase of damage index. 10% dosage of rubber content could increase the first-order damping ratio and loss modulus, and increase the energy dissipation capacity of RRAC.
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  • 收稿日期:  2021-11-10
  • 网络出版日期:  2022-12-01

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