掺机制砂C50自密实混凝土设计及应用
摘要：以预拌混凝土企业生产的普通C50混凝土相关数据为基础，采用正交设计方法研究单方胶凝材料用量、砂率、机制砂与天然砂比例、粉煤灰与矿渣粉比例4个因素对自密实混凝土的强度和自密实性能的影响和变化规律。研究结果表明，机制砂的掺入对混凝土的自密实性能有不利影响；在水胶比不变的前提下，单方胶凝材料用量的增加对混凝土抗压强度、自密实性能均有积极影响；筛选出了满足施工技术参数要求的因素组合。
关键词：机制砂，自密实混凝土，胶凝材料用量，砂率，配合比，正交设计方法
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[3] 冯乃谦.流态混凝土的历史与发展[J].混凝土及加筋混凝土，1984(2):7-10.
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[5] 蒋正武，石连富，孙振平.用机制砂配制自密实混凝土的研究[J].建筑材料学报，2007,10(2):154-160.
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Design and application of C50 self-compacting concrete with machine-made sand
Abstract: Based on the data related to ordinary C50 concrete produced by ready-mixed concrete enterprises, the orthogonal design method was used to study the influence and change law of the four factors of the amount of unilateral cementitious material dosage, sand ratio, ratio of machine-made sand to natural sand, and ratio of fly ash to slag powder on the strength and self-compacting performance of self-compacting concrete. The research results show that the incorporation of machine-made sand has an adverse effect on the self-compacting performance of concrete; under the premise that the water-binder ratio remains unchanged, the increase in the amount of unilateral cementitious material has a positive effect on the compressive strength and self-compacting performance of concrete; and the combination of factors that meet the requirements of construction technical parameters was filtered out.
Keywords: machine-made sand; self-compacting concrete; amount of cementitious material; sand ratio; mix ratio; orthogonal design method
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