含有回收元件的矿物水泥乳液混合物的实验和现场评估
Elżbieta Szafranko1, Magdalena Czyż1, Maciej Lis1
1Wydział Geoinżynierii, Uniwersytet Warmińsko-Mazurski, 10-719 Olsztyn, Poland.
Materials (Basel, Switzerland)
|November 13, 2025
概括
使用回收青路面 (RAP) 和回收料的矿物水泥乳液 (MCE) 混合物显示出对道路基板的希望. 需要仔细优化粘合剂和固化,以减轻收缩和热效应造成的裂纹.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 可持续建筑 可持续建筑
背景情况:
- 道路建设面临的挑战包括原材料枯竭和废物管理.
- 冷回收混合物提供了一个可持续的替代品,利用再生青路面 (RAP) 和再生矿物聚合物.
- 矿物水泥乳液 (MCE) 粘合剂为这些可持续应用提供了可行的选择.
研究的目的:
- 评估MCE混合物的性能,包括RAP和用于道路基层的回收聚合物.
- 评估这些可持续的冷回收材料的机械性能,现场性能和裂纹行为.
- 确定影响MCE道路基础的长期耐用性和可用性的关键因素.
主要方法:
- 进行了大约160次实验室测试,以确定间接抗拉强度 (ITS) 和刚度模量 (IT-CY) 等机械性能.
- 评估MCE混合物的散装密度和空气空隙含量.
- 在第一年对测试段进行了实地调查,以监测结构完整性和裂.
主要成果:
- 在28天后,MCE混合物达到1.09 MPa的平均ITS和5873 MPa的刚度模量,符合设计规格.
- 现场测试表明,测试段的结构完整性和紧缩性良好.
- 在第一年内出现了几个横断裂,归因于水化凝固的收缩和热收缩.
结论:
- 使用RAP和回收聚物的MCE混合物可以满足道路基层应用的技术要求.
- 该研究强调了通过在道路建设中使用回收材料来减少环境影响的潜力.
- 优化粘合剂比例和固化条件对于减轻裂纹和确保这些可持续混合物的长期性能至关重要.
相关概念视频
Strength of Cement
431
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...
431
Aggregate Cement Ratio
521
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...
521
Soundness of Cement
498
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...
498
Pozzolans
464
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...
464
Testing Water Quality
340
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
340
Additives and Fillers in Concrete
316
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...
316


