过氧化氢发泡水泥浆的产气和浆体膨胀行为

IF 7.4 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2024-11-12 DOI:10.1016/j.conbuildmat.2024.139006
Wenjian Xie , Bing Chen , Hui Rong
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引用次数: 0

摘要

本研究调查了过氧化氢(H2O2)发泡水泥浆的发泡行为,尤其关注气体产生和浆体膨胀过程。研究了不同的二氧化锰(MnO2)用量(0 %-2 %)和 H2O2 用量(3 %-9 %)对新鲜水泥浆发泡过程和硬化试样性能的影响。研究结果表明,H2O2 分解产生的气体遵循伪一阶动力学,在较低的反应速度下,产生的部分气体体积转化为泥浆体积。虽然较高的 H2O2 用量能更有效地提高最终气体和泥浆体积,但增加 MnO2 用量能更有效地加速发泡过程,从而提高 H2O2 和气体的利用效率。此外,增加 MnO2 的用量可提高产气曲线的一阶反应速率常数,而增加 H2O2 的用量则效果相反。此外,增加 MnO2 或 H2O2 的用量会导致孔径增大,干密度、抗压强度和热导率降低。这些发现强调了表征发泡过程的重要性,并为水泥浆的发泡机制提供了启示。
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Gas production and slurry expansion behavior of hydrogen peroxide foamed cement pastes
This study investigated the foaming behavior of hydrogen peroxide (H2O2) foamed cement pastes, with a particular focus on gas production and slurry expansion processes. The effects of varying manganese dioxide (MnO2) dosage (0 %–2 %) and H2O2 dosage (3 %–9 %) on the foaming process of fresh slurry and the properties of hardened specimens were examined. The findings revealed that gas production from H2O2 decomposition followed pseudo-first-order kinetics, with a portion of the generated gas volume converting into slurry volume at lower reaction speeds. While higher H2O2 dosages more effectively improved the final gas and slurry volume, increased MnO2 dosages were more effective in accelerating the foaming process and thereby improving H2O2 and gas utilization efficiency. Furthermore, higher MnO2 dosages raised the first-order reaction rate constants of the gas production curves, whereas higher H2O2 dosages had the opposite effect. Additionally, increased MnO2 or H2O2 dosages led to larger pore sizes and a reduction in dry density, compressive strength, and thermal conductivity. These findings underscore the significance of characterizing the foaming process and offer insights into the foaming mechanisms of cement pastes.
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来源期刊
Construction and Building Materials
Construction and Building Materials 工程技术-材料科学:综合
CiteScore
13.80
自引率
21.60%
发文量
3632
审稿时长
82 days
期刊介绍: Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.
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