一种可持续的低碳地质聚合物混凝土的机械性能,使用石衍生的酸盐溶液
Jonathan Oti1, Blessing O Adeleke1, Francis X Anowie1
1Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 1DL, UK.
Materials (Basel, Switzerland)
|April 27, 2024
概括
这项研究探讨了在地质聚合物混凝土中使用石粉作为可持续的酸盐替代品. 虽然最初的强度低于普通波特兰水泥,但地聚合物混凝土显示出低强度应用的潜力.
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.
- 可持续建筑 可持续建筑
背景情况:
- 地质聚合物混凝土通过利用废物材料,为普通波特兰水泥 (OPC) 提供了一个可持续的替代方案.
- 开发环保活性剂对于更广泛地质聚合物混凝土的采用至关重要.
- 石粉 (PP) 是一种酸替代品 (SSA) 的潜在来源.
研究的目的:
- 研究在地聚合物混凝土中使用石粉衍生的酸盐替代品 (SSA) 的可行性.
- 用SSA评估地质聚合物混凝土的机械性能和密度.
- 为了比较地质聚合物混凝土与开发的SSA与对照OPC混凝土的性能.
主要方法:
- 六个地质聚合物混凝土批量被制备了不同的性/前体 (A/P) 比率 (0.1-0.5) 使用从石粉中获得的SSA.
- 机械性能 (压力,拉力,屈曲强度) 和硬化密度在28天和56天进行了测试.
- 混合AF4与A/P比为0.4被确定为最优的地质聚合物设计.
主要成果:
- 最佳地质聚合物混合物 (AF4) 与对照OPC混凝土相比,具有较低的28天压力,拉力和屈曲强度.
- 地质聚合物混凝土配方实现了与对照OPC混凝土可比的28天硬化密度.
- 56天AF4的强度增加了19%,达到22.4MPa,而OPC则增加了5%,达到30.8MPa.
- 地质聚合物混合物的机械性能较低可能是由于添加了水以提高可加工性.
结论:
- 石粉衍生的SSA显示出开发适用于低强度建筑应用的地聚合物混凝土的潜力.
- 需要进一步优化,以提高地质聚合物混凝土的机械性能,使用这种SSA.
- 使用废物材料,如石粉,有助于可持续的建筑实践.
相关概念视频
Pozzolans
112
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...
112
Pore Size Distribution
123
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
Adequate...
123
Alkali Aggregate Reaction in Concrete
94
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
94
Abrasion Resistance of Concrete
129
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
One such test is the revolving disc test, where three plates...
129
Porosity in Cement Paste
127
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
The balance of water to cement in the mix is...
127
Effects of Air-entrainment in Concrete
84
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
84


