单元水含量控制对混凝土性能在混凝土生产过程中的影响
Sang-Hoon Park1, Hwa-Sung Ryu2, Won-Jun Park3
1Department of Safety & Disaster Management, Sungkyunkwan University, Suwon 16419, Republic of Korea.
Materials (Basel, Switzerland)
|February 24, 2024
概括
控制混凝土中的水含量对于性能至关重要. 超过25公斤/立方米的额外水量显著降低了混凝土的强度和耐用性,影响了建筑质量.
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
- 建设管理建设管理.
背景情况:
- 混凝土混凝土生产依赖于精确的含水量以获得最佳性能.
- 单位含水量的变化可能会对混凝土的机械性能和耐用性产生负面影响.
- 控制水含量对于满足具体应用中的设计标准至关重要.
研究的目的:
- 调查增加和控制单位含水量对混凝土成品性能的影响.
- 确定影响混凝土强度,多孔性和出血的水含量关键值.
- 为了质量保证,制定管理混凝土生产中的水含量准则.
主要方法:
- 分析了20个混凝土混合物比例,没有吸气剂.
- 对单位含水量的系统变化,以评估性能变化.
- 评估混凝土的压力强度,多孔性,出血,离子扩散和碳化深度.
主要成果:
- 增加的单位含水量显著降低了混凝土的压力强度和透度.
- 单位含水量增加25公斤/立方米或更多,导致强度降低到低于设计标准,并增加出血.
- 较高的水含量也对离子扩散产生了负面影响,并增加了混凝土碳化深度.
结论:
- 为了保持混凝土的强度和耐用性,保持额外的水变化到单位总水含量在15公斤/立方米或更低的水平至关重要.
- 建议水-水泥比率为48%或更低,单位含水量为155公斤/立方米或更低,用于质量管理.
- 精确管理单位含水量错误非常重要,考虑到聚合物特性和湿度状态.
更多相关视频
06:27Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence
Published on: September 23, 2018
9.3K
05:38Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests
Published on: March 7, 2025
262
相关概念视频
01:14Testing Water Quality
110
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...
110
01:28Water Cement Ratio
573
The water-cement ratio is pivotal in defining concrete's quality. This ratio, a balance between the weight of water and cement in the mix, shapes the concrete's strength, durability, and resistance to environmental factors. As identified by Abrams’ law, less water in the mix equates to stronger concrete. However, water is essential not only for the chemical process of hydration but also for the concrete's workability and compaction. While hydration chemically binds water and...
573
01:24Factors Affecting Workability
72
The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
72
01:19Quality of Water
94
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
94
01:25Workability of Concrete
105
The workability of concrete is a crucial property that affects its handling, placing, and finishing during construction. It describes the ease with which concrete can be mixed, placed, compacted, and finished. Workability is primarily concerned with the concrete's movement and its ability to resist internal friction and external resistance from molds and reinforcements during the application process.
Concrete's workability is determined by its resistance to internal forces that arise...
Concrete's workability is determined by its resistance to internal forces that arise...
105
01:14Design Example: Managing Concrete Workability
81
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.
81