超级增塑剂对低等级石灰岩基水泥混合物的性能的影响
Murugan Muthu1, Boddapati Ganesh Kumar2, Neven Ukrainczyk3
1Department of Materials Engineering, Wroclaw University of Science and Technology, 50-372 Wrocław, Poland.
Materials (Basel, Switzerland)
|June 19, 2024
概括
在混凝土中使用低等级石灰石 (LGL) 需要超级增塑剂来管理水需求并提高性能. 一种特定的超级可塑化剂显著改善了流量,并在基于LGL的砂中实现了36 MPa的压力强度.
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.
- 建筑材料 建筑材料
背景情况:
- 低度石灰岩 (LGL) 是一个未充分利用的采石场副产品.
- 当LGL作为混凝土中的填充物时,增加了对水的需求.
- 有效利用LGL需要解决其对混凝土可操作性和强度的影响.
研究的目的:
- 调查商业超级增塑剂对含有LGL的水泥混合物的影响.
- 为了确定LGL-水泥混合物的最佳超级可塑剂剂量.
- 评估混凝土的性能提升,其中包括LGL和超级塑化剂.
主要方法:
- 测试了六种商业超级增塑剂,其中包括含有35%LGL和2%石膏的水泥混合物.
- 通过Marsh cone和mini-slump测试在各种水/粘合剂 (w/b) 比率上确定最佳超级可塑剂剂量.
- 使用扫描电子显微镜 (SEM) 和X射线衍射 (XRD) 分析了硬质砂的性能,包括压力强度.
主要成果:
- 超级可塑化剂具有更高的活性固体含量最大化水泥流量,无论w/b比率.
- 基于LGL的砂在28天内达到大约36MPa的最大压力强度,使用最佳的超级可塑剂.
- SEM和XRD分析显示,微观结构中形成了一种新丰富的矿物质.
结论:
- 超级可塑剂的选择和特性极大地影响了含有LGL的混凝土的性能.
- 优化的超级可塑剂添加可以减轻LGL对水需求的负面影响,并增强机械性能.
- 这项研究支持LGL作为混凝土生产中的补充水泥材料的可行使用.
相关概念视频
Superplasticizers
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
Plasticizers
75
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
75
Additives and Fillers in Concrete
93
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...
93
Types of Cement II
106
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...
106
Pozzolans
110
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...
110
Types of Cement I
111
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...
111


