开发和描述可持续的无水泥控制的低强度材料,使用石膏和建筑废弃物土壤
Yunfei Wu1, Jian Geng2, Haoze Zhu2
1School of Civil Engineering, Huzhou Vocational and Technical College, Huzhou 313000, China.
Materials (Basel, Switzerland)
|December 17, 2024
概括
本研究探讨使用石膏 (TG) 和建筑废物土壤 (CWS) 来制造环保,无控制低强度材料 (CLSM). 最佳的混合物达到所需的流动性和强度,减少对环境的影响.
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:
- 传统建筑材料对碳排放做出了重大贡献.
- 在土木工程应用中,对可持续替代品的需求越来越大.
- 废物材料,如石膏和建筑垃圾土壤,为资源价值化提供了机会.
研究的目的:
- 调查开发无水泥控制低强度材料 (CLSM) 的可行性,使用石膏 (TG) 和建筑废物土壤 (CWS).
- 为了确定TG,CWS,磨砂颗粒高炉渣,飞灰和热的最佳混合比例,以获得理想的CLSM特性.
- 评估开发的CLSM的机械性能,流动性,出血和体积稳定性.
主要方法:
- 配制和测试十三种不同的CLSM混合物,其中TG和CWS的比例各不相同.
- 在56天评估出血,流动性和压力强度.
- 使用X射线衍射 (XRD) 和扫描电子显微镜 (SEM) 分析体积变化和材料特征.
主要成果:
- 建筑垃圾土壤 (CWS) 替代率超过40%,有效控制出血低于5%.
- 最佳的水/固体比率 (0.40-0.46) 确保了足够的流动性.
- 石膏 (TG) 含量在60-70%之间最小化了体积变化,而较高的TG含量提高了强度,但降低了流动性.
- 含量为3-5%,导致56天强度低于2.1 MPa.
结论:
- 石膏 (TG) 和建筑垃圾土壤 (CWS) 可以有效地用于生产可持续的,无水泥的控制低强度材料 (CLSM).
- 仔细控制TG和含量对于优化CLSM的机械性能和体积稳定性至关重要.
- 开发的CLSM为建筑应用提供了一个低碳的替代方案,促进循环经济原则.
相关概念视频
01:21Types of Cement I
102
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...
102
01:24Hydration of Cement
197
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...
197
01:22Types of Cement II
93
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...
93
01:17Soundness of Cement
143
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...
143
01:20Strength of Cement
122
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...
122
01:26Design Example: Sustainability in Concrete Building
155
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...
155