| 摘要: |
| 开展了不同粒径骨料机制砂自密实混凝土构件的性能研究.结果表明：不同粒径骨料机制砂自密实混凝土工作性能良好，其抗压强度及密实度较大.相比普通粒径骨料机制砂自密实混凝土，超大粒径和大粒径骨料机制砂自密实混凝土内部温峰降低18～23℃，温峰出现时间延长4～9h，但是，其构件受弯极限载荷较低，且所受弯矩越大，超大粒径骨料的尺寸影响效应越明显.超大粒径及大粒径骨料的粒径、堆积程度、分布状态、界面黏结情况是影响机制砂自密实混凝土构件受力性能，尤其是抗弯拉性能的关键因素. |
| 关键词: 超大粒径骨料 机制砂 自密实混凝土构件 温峰 弯矩 |
| DOI：103969/j.issn1007 9629201603023 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划（973计划）项目(2011CB013805)；国家自然科学基金资助项目(51478348，51278360，51308407)；“十二五”国家科技支撑计划项目(2014BAL03B02)；上海市科委重点项目（14DZ1202302，15DZ1205003） |
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| Self compacting Concrete Members Filled with Extralarge Size Aggregates and Manufactured Sand |
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JIANG Zhengwu, YUAN Zhengcheng, QIAN Chen
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Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China
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| Abstract: |
| The properties of self compacting concrete members added with different size aggregates and manufactured sand were studied. The result indicates that the workability of self compacting concrete prepared with different size aggregates and manufactured sand added can meet the filling requirement, the compressive strength and internal compactness of different members are favorable and can meet relavent requirement. Compared with manufactured sand self compacting concrete member incorporating normal size aggregate, the internal maximum temperature peak of self compacting concrete members added with extra large size and large size aggregates decreases by 1823℃ and the temperature peak delays 49h. However, the ultimate flexural load of self compacting concrete members added with extralarge size and large size aggregates is low, and the higher bending moment is, the more obvious size effect of large size aggregate is. The key effect of the factors on mechanical properties, especially bending and tension resistance of self compacting concrete members added with different size aggregates, are diameter, accumulation degree, distribution and interface bonding of extralarge size and large size aggregate. |
| Key words: extralarge size aggregate manufactured sand self compacting concrete member temperature peak bending moment |
