在高温固化下,碳化渣激活的全固体废弃物水泥材料的水化特性和可持续性
Xiaowei Gu1, Xu Wang1, Xiaowei Ge1
1School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China; Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang 110819, China; Liaoning Institute of Technological Innovation in Solid Waste Utilization, Northeastern University, Shenyang 110819, China.
Environmental research
|July 9, 2025
概括
碳化渣 (CCS) 提高了地面颗粒高炉渣-基于钢渣的超硫化水泥 (GS-SSC) 在高温下的性能. 最佳10%的CCS添加提高了压力强度和材料密度,提供了可持续的工业废物利用方法.
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.
- 绿色化学 绿色化学
背景情况:
- 普通的波特兰水泥 (OPC) 生产具有显著的碳足迹.
- 工业固体废物,如碳化渣 (CCS),存在处理方面的挑战.
- 开发可持续的水泥材料对于减少对环境的影响至关重要.
研究的目的:
- 为了研究CCS作为激活剂在高温固化下GS-SSC中的作用.
- 分析CCS修改的GS-SSC的水化产品,微观结构和机械性能.
- 探索这种新型水泥材料的水化机制和可持续性.
主要方法:
- 制备具有不同CCS含量 (0-20 wt%) 的GS-SSC.
- 在80°C高温固化.
- 对水化产品和微观结构进行微观分析 (例如,SEM,XRD).
- 压力强度和pH发展的评估.
- 可持续性评估. 可持续性的评估.
主要成果:
- CCS增加了GS-SSC的性,并激活了GGBS-SS.的pozzolanic活动.
- 加入CCS促进了AFt和C-(A) -S-H凝的形成,使微观结构变密.
- 使用CCS,压力强度显著增加,在10%CCS下,7天后达到33.5MPa.
- 发现强度和可持续性的最佳CCS含量为10%;更高的含量对强度产生了负面影响.
结论:
- CCS有效地激活GS-SSC,在高温固化下改善其性能.
- 10%的CCS添加提供了从工业废物中获得的可持续和高性能水泥材料.
- 这项研究为设计使用GGBS-SS和CCS的低碳水泥材料提供了宝贵的参考.
相关概念视频
01:29Strength and Heat of Hydration
355
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...
355
01:24Hydration of Cement
391
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...
391
01:21Types of Cement I
187
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
187
01:20Curing of Concrete
168
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
168
01:17Soundness of Cement
241
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...
241
01:22Types of Cement II
174
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
174