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| 摘要: |
| 运用正交试验方法研究了混凝土配合比中3个独立变量即水固比、水灰比和砂率对其收缩及相关性能的影响,结果表明,在同一原材料和环境条件下,水固比是影响混凝土收缩的最主要因素,水灰比次之,砂率影响程度最小;采用功效系数法进行多指标正交分析,确定了混凝土最优配合比选择范围;研究了集灰比、浆集比对混凝土收缩的影响,指出存在使混凝土收缩最小的集灰比及浆集比的临界值. |
| 关键词: 体积稳定性,收缩,正交设计,配合比 |
| DOI： |
| 分类号:TU528 |
| 基金项目:上海市科技攻关重点项目(032112059) |
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| Influence of Mix Proportion on the Shrinkage of Concrete by Orthogonal Experiment |
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YAO Wu ZHENG Xin
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| Abstract: |
| By adopting the method of orthogonal experimental design,the influence of three independent variables,that is water-solid ratio,water-cement ratio and sand percentage on the shrinkage of concrete and other related properties was studied.The results show that water-solid ratio is one of the most important factors affecting shrinkage of concrete,secondly water-cement ratio and lastly sand percentage under the same conditions.By using value coefficient to analyze the orthogonal experiment results,the optimized mix proportion of concrete is determined.Meanwhile,the influence of aggregate-cement ratio and paste-aggregate ratio is discussed.The results show that there are critical values leading to the minimum of the concrete shrinkage. |
| Key words: volume stability,shrinkage,orthogonal design,mix proportion |
