- 丁 宏1, 2，王小凡3，倪晓燕4，李 强2，王鹏举3，田国选1
2023年第10期
摘要
引用本文
摘 要：为制备具有高流动性、均匀性和稳定性的装配式预应力混凝土箱梁用自密实混凝土（SCC），在同一水胶比条件下，研究了m水泥∶m矿物掺合料、m水泥∶m粉煤灰、砂率和粗骨料级配对SCC工作性和抗压强度的影响。结果表明：SCC的工作性随着m水泥∶m矿物掺合料的增大变化不大；SCC的抗压强度随着砂率的增长呈先提高后降低的趋势；粗骨料级配对SCC工作性、抗压强度的影响较大，当粒径为5~10 mm和10~20 mm的粗骨料质量比为4∶6时，SCC的综合性能最佳。优选出的最佳SCC配合比已成功应用于雄安新区装配式预应力混凝土箱梁的生产。
Abstract: In order to prepare self-compacting concrete (SCC) with high fluidity, uniformity and stability used by prefabricated prestressed concrete box-beam, under same water-binder ratio, the effects of m水泥∶m矿物掺合料, m水泥∶m粉煤灰, sand ratio, and coarse aggregate grading on the workability and compressive strength of SCC were studied. The results show that the workability of SCC does not change significantly with the increase of m水泥∶m矿物掺合料. The compressive strength of SCC shows a trend of first increasing and then decreasing with the increase of sand ratio. The coarse aggregate grading has a significant impact on the workability and compressive strength of SCC. When the mass ratio of two graded coarse aggregates with particle sizes of 5~10 mm and 10~20 mm is 4∶6, the comprehensive performance of SCC is the best. The optimized SCC mix proportion has been successfully applied to the construction of prefabricated prestressed concrete box-beams in Xiong’an New Area.
丁宏,王小凡,倪晓燕,等.自密实混凝土在装配式预应力混凝土箱梁中的应用[J].混凝土与水泥制品,2023(10):37-42.
DING H,WANG X F,NI X Y,et al.Application of self-compacting concrete in prefabricated prestressed concrete box-beam[J].China Concrete and Cement Products,2023(10):37-42.
