添加剂来源对自凝固混凝土新鲜性质的影响
Nader Ghafoori1, Aderemi Gbadamosi1, Hamidou Diawara1
1Department of Civil and Environmental Engineering and Construction, University of Nevada, 4505 Maryland Parkway, P.O. Box 454015, Las Vegas, NV 89154-4015, USA.
Materials (Basel, Switzerland)
|July 13, 2024
概括
不同的聚碳酸盐添加剂对自凝固混凝土 (SCC) 有不同的最佳剂量. 适当的剂量确保了可接受的流动性,稳定性和SCC应用的传递能力.
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
背景情况:
- 自强化混凝土 (SCC) 需要精确的添加剂量才能达到最佳性能.
- 基于聚碳酸盐的添加剂,包括高范围的降水添加剂 (HRWRA) 和粘度修饰添加剂 (VMA),对于SCC特性至关重要.
研究的目的:
- 确定四种不同基于聚碳酸的HRWRA和VMA的最低剂量要求.
- 为了评估它们在实现目标落流量 (508-711毫米) 和视觉稳定指数 (VSI) 0或1的有效性.
- 评估产生的SCC的流动性,粘度,稳定性,通过能力和填充能力.
主要方法:
- 对四种不同的聚碳酸盐添加剂来源进行比较分析.
- 在指定的暴跌流和VSI水平上测试SCC属性.
- 评估关键性能指标:流动性,粘度,静态和动态稳定性,通过和填充能力.
主要成果:
- 在这四个来源中,最佳的添加剂剂量在四个来源之间差异很大.
- 聚碳酸 (PCE) 类型的HRWRA需要最高剂量,而聚碳酸 (PCA) 类型需要最低剂量.
- 所有测试的添加剂来源,当适当剂量时,可以达到可接受的SCC性能.
结论:
- 添加剂来源是影响SCC的剂量要求的关键因素.
- PCE和PCA添加剂在SCC中表现出不同的剂量效率.
- 有效的SCC特性是可以通过适当的选择和剂量的聚碳酸基添加剂来实现的.
关键词:
填充能力 填充能力流动性 流动性 流动性通过能力能力的能力.基于聚碳酸盐的高范围减水添加剂混合物.自强化混凝土的自强化混凝土稳定的稳定性 稳定的稳定性粘度 粘度 粘度 粘度 粘度改变粘度的添加剂混合物更多相关视频
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
233
相关概念视频
01:24Factors Affecting Workability
68
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...
68
01:28Factors Affecting Creep
132
In normal-weight aggregate concrete, the hardened cement paste is the primary contributor to creep, whereas the aggregates, being stiffer than the cement paste, are more resilient to stress-induced deformation. The stiffness of the aggregates is defined by their modulus of elasticity, and the more voluminous they are in the concrete, the less it will creep.
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
132
01:20Concrete
334
Concrete is a vital construction material extensively used worldwide, primarily valued for its strength, durability, and versatility, which it provides for various structural designs. Concrete generally comprises ingredients like Portland cement, coarse gravel, fine sand, and water. Concrete can be mixed by simple hand methods or industrially at computer-controlled plants. The mixture consists of aggregates and a paste made from water and Portland cement. This paste coats the aggregates and,...
334
01:28Effects of Air-entrainment in Concrete
82
Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
82
01:12Bonding and Strength of Aggregate
146
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
146
01:30Superplasticizers
81
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
81