(1 中铁建设集团有限公司, 北京 100040; 2 北京工业大学城市建设学部, 北京 100124)

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

中图分类号:TU528. 45 文献标志码:A 文章编号:1002-848X(2022)03-0019-04

DOI:10. 19701 / j. jzjg. LS210078

Design and application of C50 self-compacting concrete with machine-made sand

LI Yulong1,2

(1 China Railway Construction Group Co., Ltd., Beijing 100040, China;2 Department of Urban Construction, Beijing University of Technology, Beijing 100124, China)

Abstract: Based on the data related to ordinary C50 concrete produced by ready-mixed concrete enterprises, the orthogonaldesign method was used to study the influence and change law of the four factors of the amount of unilateral cementitiousmaterial dosage, sand ratio, ratio of machine-made sand to natural sand, and ratio of fly ash to slag powder on the strengthand self-compacting performance of self-compacting concrete. The research results show that the incorporation ofmachine-made sand has an adverse effect on the self-compacting performance of concrete; under the premise that thewater-binder ratio remains unchanged, the increase in the amount of unilateral cementitious material has a positive effect onthe compressive strength and self-compacting performance of concrete; and the combination of factors that meet therequirements 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

∗中铁建设集团有限公司科技研发课题( LX20-27b) .

第一作者:李玉龙,硕士研究生,工程师,一级注册建造师,主要从事土木工程材料技术质量管理工作,Email: yulonglee0617@163. com.

[引用本文] 李玉龙. 掺机制砂 C50 自密实混凝土设计及应用[ J]. 建筑结构,2022,52( 3):19-22,29. LI Yulong.Design and application of C50 self-compacting concrete with machine-made sand[J]. Building Structure,2022,52(3):19-22,29.