基于瓦拉斯托尼特 - 甲卡林的新型混合地质聚合物的合成和描述
Mazen Alshaaer1,2, Abdulaziz O S Alanazi1
1Department of Physics, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia.
Materials (Basel, Switzerland)
|September 14, 2024
概括
这项研究开发了一种使用wollastonite和metakaolin的新型地质聚合物. 添加25-50%的瓦拉斯托尼特显著提高了地质聚合物的强度,并改变了其微观结构.
科学领域:
- 材料科学 材料科学 材料科学
- 无机化学 无机化学 有机化学
- 土木工程 土木工程是指土木工程.
背景情况:
- 地质聚合物是具有越来越多应用的先进功能材料.
- 目前正在进行研究,以提高地质聚合物生产方法和性能.
- 沃拉斯托尼特和甲甲是地质聚合物合成中的关键前体.
研究的目的:
- 为了研究一个新的地质聚合物系统,利用wollastonite和metakaolin.
- 探索不同伏拉斯托尼特含量对地质聚合物特性的影响.
- 为了描述由沃拉斯托尼特添加引起的微观结构变化.
主要方法:
- 地质聚合物的合成方法是通过在不同比例 (0-50 wt.%) 中组合甲甲和瓦拉斯托尼特.
- 使用X射线衍射 (XRD),热重力测量分析 (TGA) 和扫描电子显微镜 (SEM) 的表征.
- 机械测试包括曲和压力强度测量.
主要成果:
- 地质聚合物强度保持稳定,高达12.5%的重量级.
- 屈曲强度从3 MPa增加到12.3 MPa,压力强度从23 MPa增加到54 MPa,其中25-50%的重量为wollastonite.
- 微观结构分析显示了混的形成和Si-Al-Na阶段的消失.
结论:
- 拉斯托尼特的添加,特别是在更高的百分比下,显著提高了地质聚合物的机械性能.
- 加入瓦拉斯托尼特从根本上改变了地质聚合物矩阵结构和相位组成.
- 这项研究为开发高强度地质聚合物提供了一条途径,使用wollastonite和metakaolin前体.
相关概念视频
01:21Pozzolans
104
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...
104
01:24Hydration of Cement
202
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
202
01:18Composite Masonry Walls
1.2K
Composite masonry walls combine multiple wythes of the same or different masonry materials to create a unified structure. These walls feature wythes that are bonded together either through mortar-filled collar joints, grouted spaces, or more commonly, with rigid metal ties and reinforcements, with the use of masonry header units being rare. Metal ties are preferred because they effectively minimize water penetration, as these walls primarily absorb moisture and then release it into the...
1.2K
01:29Additives and Fillers in Concrete
92
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...
92
01:13Olefin Metathesis Polymerization: Overview
2.0K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.0K
01:30Superplasticizers
81
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
81