通过混合回收混凝土聚合物来评估水泥稳定粘土的机械和扩散漏性能
Akkarachai Ruangsangthong1, Toru Inui2, Sho Ogata2
1Department of Civil Engineering, Graduate School of Engineering, The University of Osaka, 2-1 Yamadaoka, Suita, 565-0871, Osaka, Japan. Akkarachai.r@hotmail.com.
Environmental science and pollution research international
|December 23, 2025
概括
回收混凝土聚合物 (RCA) 提高了土壤稳定性,但引发了对六价 (CrVI) 泄漏的担忧. 该研究发现,40%的RCA含量优化了机械性能和限制了漏,这表明它在建筑材料中的可行性.
科学领域:
- 地质技术工程 地质技术工程
- 环境工程 环境工程
- 材料科学 材料科学 材料科学
背景情况:
- 水泥稳定对于软粘土和建筑污泥来说是常见的.
- 回收混凝土聚合物 (RCA) 被用作降低成本和回收的水泥替代品.
- 在RCA中的六价 (Cr(VI)) 构成环境风险.
研究的目的:
- 研究水泥稳定粘土-RCA混合物的机械性能.
- 评估这些混合物中的Cr(VI) 漏行为.
- 确定性能和环境安全的最佳RCA含量.
主要方法:
- 实验室实验包括Proctor压缩和液压导电性测试.
- 批量漏试验 (BLT) 和坦克漏试验 (TLT) 用于CrVI的评估.
- 测量 (Ca) 以确定有效的扩散系数 (D_eff).
主要成果:
- 添加RCA改善了压缩和降低了液压导电性,在40%RCA时获得最佳结果.
- 较高的RCA含量增加了BLT中的Cr (VI) 漏,但TLT显示漏是可以忽略的.
- 有效扩散系数 (D_eff) 在40%的RCA处是最低的,这表明化学泄漏有限.
结论:
- 40%的RCA混合物表现出改善的机械性能和降低的液压导电性.
- 在坦克测试中微不足道的Cr (VI) 漏表明,在这种含量下,环境安全.
- 优化的RCA含量平衡了性能效益,并尽量减少了对土壤稳定性的环境问题.
更多相关视频
相关概念视频
01:21Aggregate Cement Ratio
507
The Aggregate Cement ratio refers to the weight of aggregate divided by the weight of cement in a concrete mix. Altering this ratio has profound effects on the concrete's properties. This ratio plays a pivotal role in determining the strength, workability, and durability of concrete. When the Aggregate Cement ratio is higher, the mix is leaner, meaning it has less cement paste to lubricate the aggregate, potentially making the concrete less workable. Such mixes, known as lean, enhance the...
507
01:31Plasticizers
305
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...
305
01:26Alkali Aggregate Reaction in Concrete
443
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...
443
01:25Deleterious Substances in Aggregate
506
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...
506
01:20Strength of Cement
419
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...
419
01:24Hydration of Cement
757
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...
757