Effect of cellulose nanofibers on the rheological and mechanical properties of cement pastes with metakaolin and natural volcanic pozzolan

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-10-30 DOI:10.1016/j.conbuildmat.2024.138823

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引用次数: 0

Abstract

This study investigates the influence of cellulose nanofibers (CNF) on the rheological and mechanical properties of Portland cement pastes with pozzolanic additions, focusing on compressive ductility. Unlike prior research that examines individual factors, this comprehensive analysis evaluates various parameters affecting CNF-enhanced pastes. Using commercially available CNF and two pozzolanic additions—metakaolin (MK) and natural volcanic pozzolan (NVP)—the study assesses mechanical and ultrasonic methods for CNF dispersion. CNF is added at 0%, 0.05%, and 0.5% by weight of cement (CEM). Results show distinct differences in flow curves and thixotropy, both with and without ultrasound. Compressive strength tests at 28 days reveal that 0.05% CNF is optimal for CEM ＋ MK pastes without ultrasound, outperforming Portland cement pastes with NVP. However, 0.5% CNF significantly improves compressive ductility in CEM and CEM + NVP pastes, despite reduced compressive strength. This study offers valuable insights into optimizing mechanical properties of CNF-modified pastes, enhancing the efficacy and sustainability of construction materials.

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纤维素纳米纤维对掺有偏高岭土和天然火山灰胶结料的水泥浆流变性和机械性能的影响

本研究探讨了纤维素纳米纤维（CNF）对添加了胶凝剂的波特兰水泥浆的流变和机械性能的影响，重点是抗压延性。与之前研究单个因素不同，该综合分析评估了影响 CNF 增强浆料的各种参数。该研究使用市售的 CNF 和两种添加剂--高岭土（Metakaolin，MK）和天然火山灰胶结物（NVP）--评估了 CNF 分散的机械和超声波方法。按水泥（CEM）重量计，CNF 的添加量分别为 0%、0.05% 和 0.5%。结果表明，无论是使用超声波还是不使用超声波，流动曲线和触变性都存在明显差异。28 天的抗压强度测试表明，0.05% 的 CNF 是不使用超声波的 CEM ＋ MK 浆料的最佳选择，其性能优于使用 NVP 的波特兰水泥浆。然而，尽管抗压强度降低，0.5% CNF 仍能显著改善 CEM 和 CEM + NVP 浆料的抗压延展性。这项研究为优化 CNF 改性浆料的机械性能、提高建筑材料的功效和可持续性提供了宝贵的见解。

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来源期刊

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.