Role of Fine Mineral Powders to Produce High-Performance Concrete

精细矿物粉末在生产高性能混凝土中的作用

基本信息

批准号：
11650469
负责人：
SHOYA Masami
金额：
$ 1.86万
依托单位：
Hachinohe Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650469/
关键词：
High-performance concretes Fine mineral powder Bleeding Water retentivity Water retaining factor Character of powder particle Interfacial zone High durable concrete

项目摘要

In recent years, it has been pointed out that concrete structures are likely suffer the attacks due to excess load and aggravated environment, and various function and performance for them are required. Given this background, High-performance concrete with high strength, high durability and self-compacting has been developed. Fine mineral powder is considered to play an important key factor to produce these high-performance concretes. The purpose of this study is to investigate the role of water retentivity of fine mineral powder to make the concrete with high quality such as high durability. Test results are summarized as follows ;1. Characters of fine mineral powders, such as specific surface area by BET, particle size distribution, shape factor and percentage of void, are evaluated.2. The capability to retain water by the fine mineral powders is examined to estimate water retaining factors which were definea from flow test, bleeding test and centrifugation test using powder paste. M … More utual relationships are investigated not only among the water retaining factors but also between these factors and physical properties of the powders.3. The effect for improving amount and rate of concrete bleeding is studied using nine fine mineral powders which are replaced some the volume of sand. The effect to reduce the bleeding of concrete by the powder is closely related to its capability to retain water. Effect of fine mineral powder incorporated on reduction of concrete bleeding could be estimated by water retaining factor defined in these powder paste tests.4. Water with air voids in fleshly placed concrete will be moved toward the surface. When the bleeding is excessive, harmful effects will arise on production of defects such as the formation of water channels and water pockets beneath the coarse aggregates, and the spacing factor was increased near the surface layer of concrete.5. The bleeding of concrete broadly influences interfacial zone of coarse aggregates in concrete. Especially, at the 20mm〜40mm from placed side of concrete, the weakness zone around coarse aggregates is increased. The weakness zone will result in less frost resistance of concrete.6. The application of mineral fine powders is very effective to make proper air-void system, to form the fine pore structures and to control the weakness zone around coarse aggregates, and it was very important for make the high durable concrete. Less

近年来，已经指出，由于超过负载和汇总环境，混凝土结构可能会遭受攻击，并且需要各种功能和性能。鉴于这种背景，已经开发出具有高强度，高耐用性和自我压缩的高性能混凝土。细矿物粉被认为是产生这些高性能消费的重要关键因素。这项研究的目的是研究高矿物粉的水保留性，使其具有高质量（例如高耐用性）的混凝土。测试结果总结如下; 1。评估了精细矿物粉末的特征，例如通过BET，粒度分布，形状因子和空隙的百分比进行的特定表面积。2。检查了通过精细矿物粉末保留水的能力，以估计使用粉末糊的流量测试，出血测试和离心测试来定义的水位因子。 M…不仅在保留水因素和这些因素和粉末的物理性质之间研究了更多的传统关系。3。使用九个细矿物粉末，研究了改善混凝土出血量和速率的效果，这些粉末被替换为沙子的某些体积。粉末降低混凝土出血的效果与保留水的能力密切相关。在这些粉末糊测试中定义的水位因子估计，掺入的细矿物粉对混凝土出血的减少的影响。4。在肉质混凝土中，带有空隙的水将移向表面。当出血过多时，有害影响会产生对缺陷的产生，例如在粗骨料下方的水道和水袋的形成，并且在混凝土表面层附近增加间距因子。5。混凝土的出血广泛影响混凝土中粗骨料的界面区域。特别是，在距混凝土侧面20mm-40mm的情况下，在粗骨料周围的弱点增加了。弱点区将导致混凝土耐药性较小。6。矿物细粉末的应用对于制造适当的空气系统，形成细孔结构并控制粗骨料周围的弱点非常有效，这对于制造高度耐用的混凝土非常重要。较少的