来自青混合物中的金属的化行为与废轮胎的碎改性
Angela Farina1, Barbara Ruffino2, Emin Kutay1
1Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, United States.
Waste management (New York, N.Y.)
|March 8, 2024
概括
这项研究评估了含有回收材料的青混合物中的金属浸出. 虽然含量需要进一步评估,但在青中使用碎并不会比其他组件显著增加金属漏.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 地质化学 地质化学
背景情况:
- 人们担心,青中的金属从青和回收材料中出,可能会污染地下水.
- 回收的青路面和废旧轮胎的碎是青混合物中常见的回收材料.
研究的目的:
- 研究用聚合物涂层 (PCR) 和脱硫 (DVR) 修改的青混合物中的金属浸出.
- 为了比较从改性混合物中释放的金属与未经改性对照和合成聚合物 (SBS) 改性混合物.
- 量化金属度,计算释放率,并评估超越EPA饮用水限制.
主要方法:
- 使用PCR (湿干技术),DVR,控制和SBS修改混合物的青混合物的实验室制备.
- 对金属度,流速,累积质量释放和化物中评估比率的分析.
- 将金属漏数据与已有的环境法规进行比较.
主要成果:
- 是所有测试的青混合物中最常见的金属.
- 与对照和SBS混合物相比,脱化 (DVR) 混合物显示累积度显著更高.
- 聚合物涂层 (PCR) 湿混合物呈现的累积量略高于对照组,但与SBS相比.
- 评估比率表明大多数金属没有超过饮用水限制,但需要进一步评估.
- 聚合物被确定为的潜在主要来源.
结论:
- 碎并不是青混合物中金属浸的唯一来源.
- 在青路面上使用碎并不本质上导致比其他构成材料更高的金属漏.
- 需要进一步的研究才能充分了解的化动态,特别是在聚合物方面.
更多相关视频
11:14Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
12.4K
05:52Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal
Published on: June 2, 2022
2.9K
相关概念视频
Deleterious Substances in Aggregate
167
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
Another type of impurity is clay and fine material that...
167
Abrasion Resistance of Concrete
132
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...
132
Waterproofing and Anti-Bacterial Admixtures in Concrete
79
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,...
79
Corrosion of Reinforcement
182
The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
182
Effects of Air-entrainment in Concrete
85
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
85
Bioremediation
18.4K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.4K
