相关实验视频
Updated: May 16, 2025

13:48
Design and Construction of an Urban Runoff Research Facility
Published on: August 8, 2014
13.0K
热压缩作为全RAP基层建筑的替代方法.
Lisley Madeira Coelho1, Belayne Zanini Marchi2, Pedro Henrique Poubel Mendonça da Silveira2
1Department of Fortification and Construction, Military Institute of Engineering - IME, Praça General Tibúrcio, 80, Praia Vermelha, Urca, Rio de Janeiro, RJ, CEP 22290-270, Brazil. madeiralisley@gmail.com.
Scientific reports
|May 12, 2025
概括
使用热压缩用于回收青路面 (RAP) 温暖的基础,大大提高了道路基层的稳定性. 这种方法改善了机械性能,减少了永久变形,并增加了耐用,可持续路面的弹性模块.
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
- 可持续的路面设计
背景情况:
- 回收青路面 (RAP) 提供了一种可持续的替代方案,用于道路建设中的原始聚合物.
- 在RAP属性的固有变异性提出了挑战,以实现在路面层的一致的机械性能.
- 开发稳定RAP的方法对于最大限度地将其用于高质量的路面结构至关重要.
研究的目的:
- 为了研究热压缩在稳定100%再生青路面 (RAP) 混合物的有效性.
- 评估高压缩温度对RAP基层机械行为的影响,称为"温暖基层".
- 量化压缩温度对RAP混合物的永久变形 (PD) 和弹性模量 (RM) 的影响.
主要方法:
- 制备回收青路面 (RAP) 混合物,仅使用RAP材料.
- 在不同温度下应用热压缩,以创建"热基"样本.
- 使用重复负载三轴测试来测量永久变形 (PD) 和弹性模量 (RM) 的性能评估.
主要成果:
- 增加压缩温度显著改善了RAP基材的机械行为.
- 在较高压缩温度的最高应力水平下,永久变形 (PD) 降低了高达52%.
- 弹性模量 (RM) 显示显著增加,RAP-M样本显示的值大约比RAP-F最大值高187.13%,比RAP-F最小值高389.05%.
结论:
- 热压缩是稳定再生青路面 (RAP) 混合物的有效策略,创造了一个高性能温暖的基础.
- 这种技术减轻了RAP变化带来的挑战,使回收材料在路面上得到更多的纳入.
- 该研究表明,通过优化RAP利用,可以提高路面结构质量和可持续性的潜力.
相关概念视频
Mass Concreting
49
Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
49
Preplaced Aggregate Concrete
88
Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
88
Placing Concrete
65
The concrete is placed as close as possible to its final position to avoid segregation. The placed concrete is then fully compacted to expel the entrapped air, and the next layer of concrete is laid while the underlying layer is still in the plastic state. The rate at which concrete is placed and compacted is kept equal.
While placing concrete, care is taken to ensure that the concrete is laid in uniform layers, and hand shoveling and moving concrete using poker vibrators is avoided. Also,...
While placing concrete, care is taken to ensure that the concrete is laid in uniform layers, and hand shoveling and moving concrete using poker vibrators is avoided. Also,...
65
Design Example: Managing Concrete Workability
65
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.
65
Masonry Paving
236
The construction of masonry paving involves using materials such as bricks, stones, and concrete masonry units. These materials are chosen for their shape, color, strength, and resistance to abrasion and weathering. Masonry units can be installed dry on a thin layer of sand and a gravel base, or they can be embedded in mortar or asphalt on a concrete slab. For areas subjected to heavy vehicular loads, a rigid base layer of reinforced or unreinforced concrete is recommended. In contrast,...
236
Compacting Factor test
98
The compacting factor test is a method used to assess the workability of concrete. It is especially suitable for concrete mixes containing aggregates up to one and a half inches in size. This test involves specialized equipment consisting of two truncated cone-shaped hoppers and a cylinder, all with polished interior surfaces to minimize friction.
The procedure begins by placing concrete into the upper hopper without any compaction. Once filled, the bottom door of this hopper is opened,...
The procedure begins by placing concrete into the upper hopper without any compaction. Once filled, the bottom door of this hopper is opened,...
98

