大麻纤维增强聚合物复合技术用于可持续和环保的混凝土
Panumas Saingam1, Qudeer Hussain2, Gritsada Sua-Iam3
1Department of Civil Engineering, School of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
Polymers
|July 13, 2024
概括
天然大麻纤维增强绳索 (FRR) 是合成FRP的经济有效替代品,用于加强混凝土柱. 这项研究显示,压力强度和柔性显著改善,特别是对于较弱的混凝土.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
背景情况:
- 合成纤维增强聚合物 (FRP) 对于加强混凝土结构来说是昂贵的.
- 回收聚合物,就像烧焦粘土固体一样,提供了一个可持续的替代方案,但需要有效的强化方法.
研究的目的:
- 调查天然麻纤维增强绳索 (FRR) 的有效性,作为一种可持续且具有成本效益的增强材料,用于含有回收料的混凝土柱.
- 评估FRR钢筋对混凝土柱的压力强度和柔性的影响.
- 评估分析模型和机器学习对FRR增强混凝土性能的预测准确度.
主要方法:
- 在单调的轴向压缩下,制造和测试24个方形混凝土柱子,用不同层的麻FRR增强.
- 对实验数据的分析,以确定无限制混凝土强度和FRR层对性能的影响.
- 对现有的分析应力-应变模型进行评估,以预测最终的局限压力应力和应变.
- 使用文献数据来预测压力强度的神经网络模型的开发和验证.
主要成果:
- 大麻FRR显著提高了混凝土柱的压力强度和柔性,分别提高了181%和564%.
- 具有较低初始无限制混凝土强度的标本在强度和可塑性方面表现出最显著的收益.
- 分析模型在预测压力和应变方面都显示出有限的准确性,而应变预测尤其具有挑战性.
- 在现有文献数据上训练的神经网络模型在预测FRR增强混凝土的压力强度方面表现出高准确性.
结论:
- 天然大麻FRR是一种可行且具有成本效益的可循环聚合物的混凝土柱体增强剂,可显著改善机械性能.
- 在具有较低初始强度的混凝土中,性能提升更为明显.
- 机器学习,特别是神经网络,在准确预测麻FRR限制混凝土的行为方面表现有前途,优于传统分析模型.
相关概念视频
01:22Fiber Reinforced Concrete
73
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...
73
01:26Design Example: Sustainability in Concrete Building
164
As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
164
01:23Abrasion Resistance of Concrete
125
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...
125
01:22Waterproofing and Anti-Bacterial Admixtures in Concrete
77
Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
Waterproofing admixtures render concrete hydrophobic,...
77
01:29Additives 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
01:27Shrinkage in Concrete
90
Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
90