利用富含二氧化的废物材料来提高混凝土的性能及其环境评估
Mohammed Ibrahim1, Muhammad Kalimur Rahman2, Ashraf A Bahraq3
1Applied Research Center for Metrology Standards and Testing, Research and Innovation, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia.
概括
本研究探讨从工业废物中使用富含的替代补充水泥材料 (SR-ASCM),以取代混凝土中的普通波特兰水泥 (OPC). 结果显示,比较强度和耐久性提高,显著减少二氧化碳排放.
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.
- 环境科学 环境科学
背景情况:
- 工业固体废物通常含有二氧化和,但不符合SCM标准 (ASTM C618).
- 这些材料可以根据ASTM C1709.0分类为替代补充水泥材料 (ASCM).
- 富含的ASCM废物 (SR-ASCM) 是在石灰岩聚合物的加工过程中产生的.
研究的目的:
- 评估使用SR-ASCM作为混凝土中普通波特兰水泥 (OPC) 的部分替代品的可行性.
- 开发具有结构可行性和耐久性的混凝土,增强可持续性.
- 评估SR-ASCM对混凝土机械性能,耐用性和环境足迹的影响.
主要方法:
- 原始SR-ASCM的矿物学和形态学性质的表征.
- 研究混凝土的工程性能和耐用性,部分用SR-ASCM取代OPC.
- 评估压力强度,化物透阻力和二氧化碳排放减少.
主要成果:
- 由于其波佐兰性活动,SR-ASCM被列为ASCM.
- 使用15%的SR-ASCM替代混凝土实现了与对照混合物 (51.0 MPa) 相比的90天压力强度 (51.9 MPa).
- SR-ASCM混凝土对化物透具有显著的抗性 (迁移系数减少36%) 并减少了CO2排放 (14-33%).
结论:
- SR-ASCM可以有效地用作混凝土中的OPC的部分替代品.
- SR-ASCM增强了混凝土的机械性能和耐用性,可能是由于波佐兰反应性和微观结构的影响.
- 在混凝土中使用SR-ASCM提供了显著的社会经济和环境效益,促进了可持续建筑实践.
相关概念视频
Deleterious Substances in Aggregate
269
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
Another type of impurity is clay and fine material that...
269
Additives and Fillers in Concrete
136
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...
136
Pozzolans
203
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...
203
Quality of Water
200
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
200
Design Example: Sustainability in Concrete Building
229
As the construction industry moves towards more eco-friendly practices, concrete's adaptability and its ability to incorporate sustainable features make it a key material in the drive towards greener building solutions.
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
There are multiple approaches to achieve sustainability in a commercial concrete building. For instance, construct a concrete parking area under the building, utilizing pervious concrete paver blocks in open areas to facilitate rainwater collection through an underground...
229
Alkali Aggregate Reaction in Concrete
194
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...
194


