基于高的纤维增强土壤水泥机械性能分析
Junnan Zhao1, Zhongling Zong1, Hang Cen1
1School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang 222005, China.
Materials (Basel, Switzerland)
|May 11, 2024
概括
将不同类型的纤维添加到土壤水泥中,可以显著提高其强度. 确定了最优的纤维剂量,用于不受限制的压力和分裂拉伸强度,孔径大小分析揭示了工程应用的关键结构见解.
科学领域:
- 材料科学 材料科学 材料科学
- 地质技术工程 地质技术工程
- 土木工程 土木工程是指土木工程.
背景情况:
- 纤维增强是一种经过验证的方法,可以改善土壤水泥的物理和机械性能.
- 了解不同纤维类型和剂量的影响对于优化材料性能至关重要.
研究的目的:
- 研究聚烯纤维 (PPF),聚乙醇纤维 (PVAF) 和玻璃纤维 (GF) 对纤维增强土壤水泥强度的影响.
- 为了确定最佳的纤维剂量,以增强不受限制的压力和分裂拉伸强度.
- 分析纤维增强土壤水泥中的孔隙结构和能量演变.
主要方法:
- 用不同的纤维剂量 (0.5%2%) 制备纤维增强土壤水泥.
- 进行无限制的压力强度测试和分割拉伸强度测试.
- 使用扫描电子显微镜 (SEM) 进行微观结构分析和侵入孔径测量 (MIP) 进行毛孔结构分析.
主要成果:
- 不受限制的压力强度在所有纤维类型的0.5%纤维剂量 (26.7227.67 MPa) 达到峰值.
- 在所有纤维类型 (2.272.34 MPa) 的1.5%纤维剂量下最大化了分割拉伸强度.
- 主要的孔径从10nm到100nm不等,适度的纤维剂量将能量损失降到最低.
结论:
- 纤维类型和剂量显著影响土壤水泥的机械性能.
- 为了最大限度地提高压力和拉伸强度,存在最佳的纤维剂量.
- SEM和MIP分析为微观结构和孔隙特征提供了宝贵的见解,支持工程应用,如螺旋核心硬化.
更多相关视频
相关概念视频
01:22Fiber Reinforced Concrete
75
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
75
01:20Strength of Cement
133
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
133
01:17Soundness of Cement
162
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
162
01:15Fineness of Cement
129
The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
Direct...
129
01:18Porosity in Cement Paste
126
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
The balance of water to cement in the mix is...
126
01:17Mortar Properties
122
Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
122