储存温度对双固化复合水泥选定的强度参数的影响
Joanna Giełzak1, Agata Szczesio-Wlodarczyk2, Kinga Bociong3
1Department of Prosthodontics, Medical University of Lodz, 92-213 Łódź, Poland.
Journal of functional biomaterials
|October 27, 2023
概括
储存温度对牙水泥强度的影响最小,尽管硬度有所不同. 较高的填料含量与双固复合材料水泥中优越的屈曲强度和硬度相关.
科学领域:
- 牙科材料科学 牙科材料科学
- 牙修复 牙修复 牙修复 牙修复 牙修复
- 生物材料工程 生物材料工程
背景情况:
- 直接修复在牙科假牙中很普遍.
- 由于对固定修复的材料需求日益增加,评估牙科水泥的强度参数至关重要.
研究的目的:
- 为了研究储存温度对四种双固化复合水泥强度参数的影响.
- 在不同温度下评估屈曲强度 (FS),屈曲模量 (FM),直径拉伸强度 (DTS) 和维克斯硬度 (HV).
主要方法:
- 测试了四种双固化复合混凝土:Multilink Automix,seT PP,MaxCem和Bifix混合支柱. 这些是测试的.
- 在准备样本之前,水泥在8°C,15°C,25°C或35°C下存储了7天.
- 测量了包括FS,FM,DTS和HV在内的关键强度特性.
主要成果:
- 直径拉伸强度和屈曲强度对8°C至35°C之间的储存温度的依赖程度最小.
- 维克尔硬度在不同储存温度下显示了MaxCem和Multilink Automix之间的一些统计差异.
- 在某些水泥中,屈曲强度和屈曲模量在25°C时最低,在35°C时最高.
- 填料含量最高的水泥 (重量70%),表现出最高的屈曲强度和维克尔硬度.
结论:
- 储存温度对经过测试的双固化复合水泥的直径拉伸强度和屈曲强度的影响有限.
- 维克斯硬度可能会受到储存温度的影响,在特定的水泥品牌之间观察到差异.
- 复合水泥中较高的填料含量与增强的屈曲强度和硬度有关,这表明材料组成是性能的一个关键因素.
更多相关视频
08:40Standard Test Method ASTM D 7998-19 for the Cohesive Strength Development of Wood Adhesives
Published on: May 17, 2020
3.0K
07:15A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
Published on: December 11, 2014
13.8K
相关概念视频
Strength of Cement
147
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
147
Strength and Heat of Hydration
250
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...
250
Curing of Concrete
99
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...
99
Setting Time of Cement
177
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...
177
Accelerated Curing of Concrete
154
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
154
Cold Weather Concreting
76
When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
To counteract the negative impacts of cold weather, ensuring...
76
