通过对聚烯纤维进行修改,提高煤河混凝土 (CGC) 的疲劳性能:实验性评估
Di Wu1,2, Laiwang Jing1, Yan Li2
1School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232000, China.
Polymers
|April 27, 2024
概括
聚烯纤维 (PPF) 提高了煤混凝土 (PGC) 的强度和耐疲劳性. 通过40%的基替代和0.2%的PPF添加剂实现了最佳结果,提高了耐用性和利用性.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 环境工程 环境工程
背景情况:
- 煤矿库存带来了重大的环境风险.
- 煤混凝土 (GC) 提供了一个解决方案,但面临着诸如低强度和疲劳阻力差等挑战.
- 聚烯纤维 (PPF) 可能会增强GC特性.
研究的目的:
- 研究聚烯纤维 (PPF) 对煤混凝土 (PGC) 机械和疲劳性能的影响.
- 为了确定最佳的基替代率和PPF添加剂,以提高PGC性能.
- 为PGC在苛刻环境中的应用提供实验数据.
主要方法:
- 制备具有不同基替代率的PGC (20%,40%,60%) 和PPF添加剂 (0%,0.1%,0.2%,0.3%) 的混合物.
- 进行单轴压力强度和重复负载实验.
- 使用扫描电子显微镜 (SEM) 进行微观结构分析.
主要成果:
- 40%的轮替换率显著增加了单轴压力强度,高达19.4%.
- 加入PPF增强了PGC的延展性,降低了33.76%的损伤因子和19.42%的残余应变 (PGC-40-0.2与PGC-40-0).
- 0.2%的PPF添加剂被确定为最佳的疲劳性能.
结论:
- 聚烯纤维有效地提高了煤混凝土的强度,柔性和耐疲劳性.
- 40%的基替代率与0.2%的PPF添加剂相结合,为增强的PGC提供了一个有希望的配方.
- 这项研究为在具有挑战性的结构应用中利用煤混凝土提供了基础.
更多相关视频
相关概念视频
Fiber 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
Fatigue Strength of Concrete
189
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
189
Pozzolans
112
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
Fly ash is...
112
Abrasion Resistance of Concrete
129
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
One such test is the revolving disc test, where three plates...
129
Additives and Fillers in Concrete
93
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
The...
93
Aggregate Cement Ratio
239
The Aggregate Cement ratio refers to the weight of aggregate divided by the weight of cement in a concrete mix. Altering this ratio has profound effects on the concrete's properties. This ratio plays a pivotal role in determining the strength, workability, and durability of concrete. When the Aggregate Cement ratio is higher, the mix is leaner, meaning it has less cement paste to lubricate the aggregate, potentially making the concrete less workable. Such mixes, known as lean, enhance the...
239


