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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (4): 1304-1314.DOI: 10.16552/j.cnki.issn1001-1625.2025.0900

• 资源综合利用 • 上一篇    下一篇

硅灰-聚甲醛纤维再生水工混凝土力学和耐水性能研究

谌君诚(), 罗玲(), 秦拥军, 郭阳光, 李琦, 程昊   

  1. 新疆大学建筑工程学院,乌鲁木齐 830047
  • 收稿日期:2025-09-08 修订日期:2025-09-28 出版日期:2026-04-20 发布日期:2026-05-14
  • 通信作者: 罗玲,副教授。E-mail:24522597@qq.com
  • 作者简介:谌君诚(1999—),男,硕士研究生。主要从事建筑固体废弃物回收利用的研究。E-mail:1021830265@qq.com
  • 基金资助:
    新疆维吾尔自治区重点研发专项任务(2022B03036-1);新疆维吾尔自治区自然科学基金(2022D01D27)

Mechanical Properties and Water Resistance of Recycled Hydraulic Concrete with Silica Fume and Polyoxymethylene Fiber

CHEN Juncheng(), LUO Ling(), QIN Yongjun, GUO Yangguang, LI Qi, CHENG Hao   

  1. College of Civil Engineering and Architecture,Xinjiang University,Urumqi 830047,China
  • Received:2025-09-08 Revised:2025-09-28 Published:2026-04-20 Online:2026-05-14

摘要:

本文主要研究了硅灰(SF)和聚甲醛(POM)纤维掺量对再生水工混凝土力学性能和耐水性能的影响。试验选用新疆地区再生粗骨料(RCA),设计12组配合比,探讨硅灰(0%、5%、10%,质量分数)和POM纤维(0%、0.3%、0.6%、0.9%,体积分数)掺量对再生水工混凝土立方体抗压强度、劈裂抗拉强度、抗折强度、软化系数及毛细吸水量的影响规律。试验结果表明,与未掺硅灰和POM纤维的基准组相比,单独掺入10%的硅灰时,试件的28 d立方体抗压强度提高了16.49%。单独掺入0.6%的POM纤维时,试件的28 d劈裂抗拉强度提高了36.46%。复掺5%的硅灰和0.6%的POM纤维时,试件的28 d立方体抗压强度、劈裂抗拉强度和抗折强度分别提高了19.96%、49.10%和43.94%。复掺5%的硅灰和0.3%的POM纤维时,试件的软化系数提高10.88%,672 h毛细吸水量降低26.38%,说明复掺策略的性能改善效果更为显著,其机理在于优化微观结构并减少微裂缝;但过量掺入(如10%硅灰+ 0.9%POM纤维)则会因团聚效应和水分竞争导致性能劣化。本研究为新疆地区水利工程提供了一种高性能再生混凝土的优化配比方案。

关键词: 再生水工混凝土, 硅灰, POM纤维, 力学性能, 耐水性能, 微观结构

Abstract:

This paper mainly studied the influence of silica fume (SF) and polyoxymethylene (POM) fiber dosage on the mechanical properties and water resistance of recycled hydraulic concrete. Recycled coarse aggregate (RCA) from the Xinjiang region was selected for the experiment. Twelve mix proportions were designed to explore the influence of SF (0%, 5%, 10%, mass fraction) and POM fiber (0%, 0.3%, 0.6%, 0.9%, volume fraction) dosages on cube compressive strength, splitting tensile strength, flexural strength, softening coefficient, and capillary water absorption of recycled hydraulic concrete. The test results show that compared with the benchmark group without SF and POM fiber, the addition of 10% SF alone increases the 28 d cube compressive strength of the specimens by 16.49%. The addition of 0.6% POM fiber alone increases the 28 d splitting tensile strength of the specimens by 36.46%. The combined addition of 5% SF and 0.6% POM fiber increases the 28 d cube compressive strength, splitting tensile strength, and flexural strength of the specimens by 19.96%, 49.10%, and 43.94%, respectively. The addition of 5% SF and 0.3% POM fiber increases the softening coefficient by 10.88%, and the capillary water absorption at 672 h decreases by 26.38%, indicating that the combined addition leads to a more significant improvement in properties, and the mechanism is attributed to the optimization of the microstructure and reduction of micro-cracks. However, excessive addition (such as 10%SF+0.9%POM fiber) will lead to performance deterioration due to the agglomeration effect and competition for water. This study provides an optimized mix proportion scheme for high-performance recycled concrete used in water conservancy projects in Xinjiang region.

Key words: recycled hydraulic concrete, silica fume, POM fiber, mechanical property, water resistance, microstructure

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