优化冷乳液混合物与废煤底灰的优化:一个基于绩效的研究
Mohammad Iqbal Malik1, Rania Al-Nawasir2, Mohammad Shafi Mir3
1Department of Civil Engineering, National Institute of Technology, Srinagar, India. iqbal_02mtech20@nitsri.net.
Environmental science and pollution research international
|August 9, 2025
概括
煤底灰 (CBA) 可以取代冷乳液混合物 (CBEM) 中的水泥,用于可持续的路面施工. 使用30%CBA实现了最佳性能,与传统青相比,提高了机械性能和耐久性.
科学领域:
- 材料科学与工程 材料科学与工程
- 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:
- 越来越多的环境问题需要可持续的替代传统热混合青 (HMA).
- 煤底灰 (CBA) 是一个丰富的废物材料,有可能用于建筑.
- 冷乳液混合物 (CBEM) 为HMA提供了一个低能耗的替代品.
研究的目的:
- 开发一种新的冷乳液混合物 (CBEM) 用于使用煤底灰 (CBA) 作为部分水泥替代品的粘合剂课程.
- 评估CBEM的机械性能和耐用性,其CBA含量不同 (0-50%).
- 为了比较开发的CBEM与传统HMA和标准CBEM (NCBEM) 的性能.
主要方法:
- 在CBEM中用CBA部分替换水泥填料,比例为0%,10%,20%,30%,40%和50%.
- 机械性能测试:马歇尔稳定性,间接抗拉强度 (ITS),弹性模量 (ITSM),流量数和耐久性.
- 对HMA和NCBEM进行比较分析.
- 场发射扫描电子显微镜 (FESEM) 用于微观结构分析.
主要成果:
- 使用高达30%的CBA替代的CBEM显示出最佳性能,显示出增加的马歇尔稳定性和与HMA相比的间接拉伸强度 (ITS).
- 较高的CBA含量 (高达50%) 提高了弹性模量和路阻力.
- CBEM-50CBA的耐久性比HMA高出42%,这归因于通过FESEM观察到的增强的混凝土化合物形成 (C-S-H凝).
结论:
- 在CBEM中用CBA部分替代水泥是可持续路面粘合剂课程的可行策略.
- 确定了30%的最佳CBA替代水平,以实现卓越的机械性能和耐久性.
- 这种方法为传统的青混合物提供了一种环保和高效的替代方案.
相关概念视频
01:14Design Example: Managing Concrete Workability
121
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
121
01:27Cold Weather Concreting
112
When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
To counteract the negative impacts of cold weather, ensuring...
112
01:20Hot Weather Concreting
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Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
124
01:21Pozzolans
190
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...
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01:21Masonry in Cold and Hot Weather Conditions
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In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
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134
01:19Retarders
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Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
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