合石膏添加对基于甲或飞灰矩阵的地质聚合物定位动力学和机械强度的影响
Rabii Hattaf1, Abdelilah Aboulayt2, Nouha Lahlou3
1Laboratory of Interface Materials and Environment, Faculty of Sciences Aïn Chock, University Hassan II Casablanca, 53306, Casablanca, Morocco. rab.hattaf@gmail.com.
概括
将合石膏添加到地质聚合物矩阵 (基于金属或飞灰) 影响可加工性和设置性. 虽然高达6%的石对强度的影响很小,但较高的数量会由于孔隙性增加而降低压力强度.
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.
- 地质聚合物化学 地质聚合物化学
背景情况:
- 地质聚合物矩阵为传统水泥提供了可持续的替代品.
- 石是肥料生产的副产品,具有潜在的补充性水泥材料.
- 了解石膏对地质聚合物特性的影响对于其有效利用至关重要.
研究的目的:
- 研究合石膏添加对金属和飞灰基地质聚合物矩阵的新鲜和硬化性能的影响.
- 在不损害矩阵完整性的情况下,确定合石膏的最佳添加率.
- 为了描述由所诱导的微观结构和机械变化.
主要方法:
- 新鲜的属性:可加工性的修质,设置的电导性.
- 硬化性能:X射线衍射 (XRD),差异热分析 (DTA),扫描电子显微镜 (SEM) 和压力强度测试.
- 地质聚合物矩阵是使用金属和飞灰合成的.
主要成果:
- 在两种矩阵类型中,合石膏的添加增加了粘度和延迟了设置.
- 由于可加工性问题,添加率被限制在15% (甲) 和12% (飞) 的重量.
- 微观结构分析显示石膏溶解并形成硫酸和酸水合物.
- 压力强度在很大程度上不受影响,高达6%的合石膏添加.
- 超过6%的添加,压力强度显著下降,归因于增加的多孔性.
结论:
- 石可以被纳入金属和飞灰基地质聚合物,但在一定程度上是可以的.
- 较高的石含量会对机械强度产生负面影响,原因是诱导的多孔性.
- 需要进一步的研究来优化石材的利用,并减轻强度的下降.
相关概念视频
Pozzolans
154
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...
154
Setting Time of Cement
204
The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...
204
Hydration of Cement
296
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...
296
Strength and Heat of Hydration
277
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
277
Soundness of Cement
205
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...
205
Superplasticizers
106
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,...
106


