自来水厂污泥超细粉对再生混凝土力学性能的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (2): 488-495.

自来水厂污泥超细粉对再生混凝土力学性能的影响

汤薇¹, 任佳栋²

1.绍兴职业技术学院建筑与设计艺术学院,绍兴 312000;
2.浙江工业大学土木工程学院,杭州 310014

收稿日期:2021-08-10 修回日期:2021-09-24 出版日期:2022-02-15 发布日期:2022-03-01
作者简介:汤薇(1978—),女,副教授。主要从事水泥基材料方面的研究。E-mail:tangw@sxvtc.com
基金资助:
浙江省重点研发计划(2020C04013)

Influence of Water Treatment Plant Sludge Ultrafine Powder on Mechanical Properties of Recycled Concrete

TANG Wei¹, REN Jiadong²

1. College of Architecture and Design Art, Shaoxing Vocational and Technical University, Shaoxing 312000, China;
2. School of Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Received:2021-08-10 Revised:2021-09-24 Online:2022-02-15 Published:2022-03-01

摘要/Abstract

摘要： 自来水厂污泥是水处理后的副产物,是一种重要的固体废弃物。本文研究了机械力活化后的自来水厂污泥超细粉(WTSP)对再生混凝土(RC)力学性能和微观结构的影响。研究结果表明,WTSP的掺入使RC早期力学性能略有降低,但后期力学性能有所提高,其中含20%(质量分数,下同)WTSP试样60 d的抗压强度和弹性模量较基准组分别提高了13%和9%。在RC中掺入10%和20%WTSP后,试样中有害孔(＞100 nm)数量分别减少了37.5%和54.6%,其微观结构得到明显改善。纳米压痕分析显示,掺入20%WTSP后,RC试样中界面过渡区(ITZ)的宽度减小了20%~25%,并且ITZ和新砂浆的弹性模量均有所增加。这可能与WTSP的晶核作用、微集料填充作用和火山灰活性有关。

关键词: 再生混凝土, 自来水厂污泥, 污泥粉, 力学性能, 微观结构, 界面过渡区

Abstract: Sludge from water treatment plant is a by-product of water treatment and an important solid waste. The influence of mechanically activated water treatment plant sludge ultrafine powder (WTSP) on mechanical properties, microstructure of recycled concrete (RC) was studied. The results show that the incorporation of WTSP reduces the mechanical properties of RC at early age, but makes positive improvement at the later stage. The compressive strength and elastic modulus of the sample containing 20% (mass fraction, the same below) WTSP at 60 d are 13% and 9% higher than those of the reference group, respectively. The number of harmful pores (>100 nm) in the sample reduces by 37.5% and 54.6%, respectively, and the microstructure improves significantly after addition of 10% and 20% WTSP into RC. Nano-indentation analysis shows that the width of interfacial transition zone (ITZ) in RC sample with 20% WTSP added decreases by 20% to 25%, and the elastic modulus of ITZ and new mortar increases. This may be related to the nucleation, the micro-aggregate filling and the pozzolanic effect of WTSP.

Key words: recycled concrete, water treatment plant sludge, sludge powder, mechanical property, microstructure, interfacial transition zone

中图分类号:

TU528

汤薇, 任佳栋. 自来水厂污泥超细粉对再生混凝土力学性能的影响[J]. 硅酸盐通报, 2022, 41(2): 488-495.

TANG Wei, REN Jiadong. Influence of Water Treatment Plant Sludge Ultrafine Powder on Mechanical Properties of Recycled Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 488-495.

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