| 摘要: |
| 采用干湿循环硫酸盐侵蚀试验方法，研究了橡胶集料自密实混凝土（RSCC）的相对动弹模量、质量损失率及抗压强度耐蚀系数的变化规律.结果表明：RSCC的相对动弹模量和抗压强度耐蚀系数随着干湿循环次数的增加先增大后减小，当水胶比相同时，试验结束时（经历150次干湿循环后）两者随着橡胶颗粒取代量（以砂体积计）的增加而减小，当强度等级相同时，试验结束时两者随着橡胶颗粒取代量的增加而增大；RSCC的质量损失率在干湿循环初期迅速增大，之后慢速增加，当水胶比相同时，试验结束时RSCC质量损失率随着橡胶颗粒取代量的增加而增大，当强度等级相同时，试验结束时RSCC质量损失率随着橡胶颗粒取代量的增加而减小，当橡胶颗粒取代量为10%时，RSCC的综合性能较为理想.改进的两阶段、三区域RSCC抗压强度耐蚀系数预测模型能够有效体现RSCC的抗压强度耐蚀系数与橡胶颗粒取代量之间的关系. |
| 关键词: 橡胶集料自密实混凝土 硫酸盐侵蚀 相对动弹模量 质量损失率 抗压强度耐蚀系数 |
| DOI：10.3969/j.issn.1007 9629.2017.03.007 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51590914，51608432）；中国博士后科学基金面上项目（2015M580822）；宁波市自然科学基金资助项目（2015A610300） |
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| Sulfate Erosion Resistance of Rubberized Self compacting Concrete |
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FU Qiang1, NIU Ditao1, XIE Youjun2, LONG Guangcheng2, HE Zhimin3
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1.School of Civil Engineering, Xian University of Architecture and Technology, Xian 710055, China;2.School of Civil Engineering, Central South University, Changsha 410075, China;3.Faculty of Architectural Civil Engineering and Environment, Ningbo University, Ningbo 315211, China
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| Abstract: |
| The variation law of relative dynamic modulus(Dm), corrosion resistance coefficient of compressive strength(Kf) and mass loss rate(Ml) of the rubberized self compacting concrete(RSCC) was investigated using the experimental method for sulfate attack in dry wet cycles. The results show that Dm and Kf for RSCC specimens first increase but then decrease with increasing number of dry wet cycles. At the same water to binder ratio, Dm and Kf decrease with the increase of the rubber particles substitution（substituting sand with the same volume） at the end of experiment, whereas increase in the same strength grade. Ml of RSCC increases rapidly in the initial dry wet cycles. At the same water to binder ratio, Ml increases with increasing rubber particles substitution at the end of experiment, whereas decreases in the same strength grade. As the rubber particles substitution reaches 10%, the comprehensive performance of RSCC is perfect. The improved prediction model can effectively reflect the relationship between Kf and the rubber particles substitution of RSCC. |
| Key words: rubberized self compacting concrete sulfate erosion relative dynamic modulus mass loss rate corrosion resistance coefficient of compressive strength |
