饱和面干再生细骨料对超高性能混凝土流动度及强度的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (5): 1503-1509.

所属专题：水泥混凝土

饱和面干再生细骨料对超高性能混凝土流动度及强度的影响

陈志武

福州市交通建设集团有限公司,福州 350002

收稿日期:2020-11-19 修回日期:2021-01-23 出版日期:2021-05-15 发布日期:2021-06-07
作者简介:陈志武(1975—),男,高工。主要从事道路工程结构、材料的研究。E-mail:2071064146@qq.com
基金资助:
福建省交通运输科技项目(202112)

Influences of Saturated Surface-Dry Recycled Fine Aggregate on Fluidity and Strength of Ultra-High Performance Concrete

CHEN Zhiwu

Fuzhou Communications Construction Group Co., Ltd., Fuzhou 350002, China

Received:2020-11-19 Revised:2021-01-23 Online:2021-05-15 Published:2021-06-07

摘要/Abstract

摘要： 为了研究饱和面干再生细骨料掺量对超高性能混凝土(UHPC)的流动度及强度的影响,在净水胶比相同情况下,设计不同再生细骨料等质量替代河砂(0%、25%、50%、75%和100%)的UHPC,测试其流动度及标准养护条件下不同龄期的强度,通过SEM及压汞测试(MIP)等揭示其机理。研究表明,随着再生细骨料掺量的增大,颗粒间的摩擦力增大,再生细骨料需要更多的水泥浆包裹和填充,这导致UHPC流动度降低。随着再生细骨料掺量的增加,总水胶比增大,ITZ₂(旧细骨料与旧水泥基体间的界面过渡区)和ITZ₃(旧水泥基体和UHPC基体之间的界面过渡区)长度增大,微裂缝增多,有害孔和多害孔含量增加,密实度降低,UHPC抗折和抗压强度降低。

关键词: 再生细骨料, 超高性能混凝土, 流动度, 强度, 孔结构, 界面过渡区

Abstract: In order to investigate the influence of the content of saturated surface-dry recycled fine aggregate on the fluidity and strength of ultra-high performance concrete (UHPC), the UHPC with various recycled fine aggregate contents (0%, 25%, 50%, 75%, and 100%, by mass fraction) in the saturated surface-dry state were designed under the same net water-binder ratio, and the fluidity and strength under standard curing at various ages of the UHPC were tested. The mechanism was revealed by SEM and MIP et al. The study results show that, with the increase of the recycled fine aggregate content, the friction between particles increases, and more cement slurry are needed to wrap and fill the surface of recycled fine aggregate, resulting in the decrease of the fluidity of UHPC. With the increase of the content of recycled fine aggregate, the total water-binder ratio increases, and the length of ITZ₂ (the interfacial transition zone between the old fine aggregate and the old cement matrix) and ITZ₃ (the interfacial transition zone between the old cement matrix and the UHPC matrix) increase, the amount of micro-cracks increase, and the harmful hole and multi-harmful hole content increase, and the compactness of UHPC decreases, and therefore the flexural strength and compressive strength of UHPC decrease.

Key words: recycled fine aggregate, ultra-high performance concrete, fluidity, strength, pore structure, interfacial transition zone

中图分类号:

TU521

陈志武. 饱和面干再生细骨料对超高性能混凝土流动度及强度的影响[J]. 硅酸盐通报, 2021, 40(5): 1503-1509.

CHEN Zhiwu. Influences of Saturated Surface-Dry Recycled Fine Aggregate on Fluidity and Strength of Ultra-High Performance Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1503-1509.

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饱和面干再生细骨料对超高性能混凝土流动度及强度的影响

Influences of Saturated Surface-Dry Recycled Fine Aggregate on Fluidity and Strength of Ultra-High Performance Concrete

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