Studies on Frost Resistance of Concrete by Making Dense Surface Layr Using Permeable Sheets and Surface Coating

透水板致密面层与表面涂层混凝土抗冻性能研究

基本信息

批准号：
04650428
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 General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650428/
关键词：
Permeable sheet Surface coating Pull-out method Surface layr strength Water cement ratio Air void Freeze-thaw test Durability 透水性シート表層部緻密化 Pull‐out法相対動弾性係数耐久性指数引抜き試験硬化コンクリートの気泡特性

项目摘要

(1) Making dense surface layr and its estimation.A total of four permeable sheets, mainly composed of high density and span bond fabric of polyester were examined to make tight surface layr of concrete. When using these sheets, the pits on concrete surface deceased and the surface appearance was greatly improved because of discharge of free water and large air void. Then, the rebound number and the surface layr strength also increased by lowering the water cement ratio.(2) Effect of permeable sheet and surface coating to improvefreeze-thaw resistance of concrete.Using permeable sheets and surface coating, the freeze-thaw resistance and surface layr strenth were greatly improved. A high relationship between the surface layr strength and relative dynamic modulus of elasticity was found, and the strongest correlation was observed between ratio of surface layr strength to initial value and relative dynamic modulus of elasticity. Therefore, the surface layr pull out strength was found to be an excellent index to evaluate the degree of surface layr of concrete due to frost damage.From the facts described above, It was found that the surface treatment such as coating and the use of permeable sheet could greatly improve the damage of the surface layr of concrete due to frost action.

（1）制作致密的表面及其估计。总共检查了四张可渗透纸，主要由高密度和聚酯的跨度键组成，以使混凝土的紧密表面层。当使用这些板时，由于自由水和大空气上排出，混凝土表面上的凹坑已死亡，表面外观得到了极大的改善。然后，通过降低水泥比的弹力数和表面线的强度也提高了。（2）可渗透的板和表面涂层的效果可改善混凝土的冻结抗性。使用可渗透的床单和表面涂层，冻干的耐药性和表面上升的弹性得到了极大的改善。发现了表面Layr强度与弹性的相对动态模量之间的高度关系，并且在表面Layr强度与初始值与初始值之比与弹性的相对动态模量之间观察到了最强的相关性。因此，发现表面上拉出强度是评估由于霜损伤而导致混凝土表面层的绝佳指数。从上述事实，发现诸如涂层和可渗透板的使用之类的表面处理可以极大地改善由于霜冻作用而引起的混凝土表面层的损害。