Study on The Quality of Surface Layr Concrete Due to Frost Damage

表层混凝土冻害质量研究

基本信息

批准号：
07650534
负责人：
SUGAWARA Takashi
金额：
$ 1.34万
依托单位：
Hachinohe National College 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：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650534/
关键词：
Surface Layr of Concrete Pull-out Test Surface Layr Strength Permeable Sheet Making Dense Surface Layr Freeze Thaw Test Durability Durability of Surface Layr Concrete Pull-out法コンクリート表層部の耐久性凍結融解試験

项目摘要

This report presents the characteristics of frost resistance of the surface layr concrete, mainly from viewpoint of surface layr strength. In this study, experimental studies were carried out using the surface layr strength as a strength index to quantify the improvement in the surface layr of concrete.The surface layr strength was measured by a pullout test using a truncated conical steel cone embedded in the side of concrete specimens. The radius of the cone was 10mm. The surface layr strength was affected by the cements, water cement ratios, curing age and depth radius ratio of the embedded steel cone. In addition, the change in strength of concrete due to freeze thaw action was studied.The results obtained in this experimental study are summarized as follows :1. The effect of curing condition on the surface layr strength was higher in concrete containing blended cement than normal portland cement.2. The permeable sheet used is effective in reducing the water cement ratio near the surface of concrete.3. The surface layr strength of concrete with the permeable sheet is greater than that without the sheet. The increase was within the range of 1.2-2.4 times the strength obtained without the sheet at the age of 28 days.The surface layr deterioration due to freezing and thawing action was large near the surface of concrete. But, the use of the permeable sheet was confirmed to be effective to improve the surface layr of concretes.5.The surface layr pullout strength was found to be an excellent index to evaluate the durability of the surface layr of concrete.

该报告介绍了表面层混凝土的霜冻耐药性的特征，主要是从表面Layr强度的角度来看。在这项研究中，使用表面Layr强度作为强度指数进行了实验研究，以量化混凝土表面层的改进。表面Layr强度通过拔出测试测量，使用截短的锥形钢锥嵌入混凝土试样的侧面。圆锥的半径为10mm。表面线的强度受嵌入式钢锥的水泥，水泥比，固化年龄和深度半径比的影响。此外，研究了由于冻结作用而导致的混凝土强度的变化。在这项实验研究中获得的结果总结如下：1。在含有混合水泥的混凝土中，固化条件对表面层的强度高于正常的波特兰水泥2。所使用的透明板可有效地降低混凝土表面附近的水泥比3。具有渗透性板的混凝土的表面强度大于没有薄板的表面强度。增加的范围是在28天内没有板的强度的1.2-2.4倍。由于冷冻和解冻作用引起的表面layr恶化在混凝土表面附近很大。但是，确认使用可渗透板可以有效地改善混凝土的表面层。5。发现表面上的拉动强度是评估混凝土表面层的耐用性的绝佳指数。