Laboratory studies on non-destructive testing of building materials and structures using thermography.

使用热成像技术对建筑材料和结构进行无损检测的实验室研究。

基本信息

批准号：
02650407
负责人：
ISHIKAWA Hirozo
金额：
$ 1.34万
依托单位：
Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650407/
关键词：
Thermography Non-destructive Testing Building Materials Reinforced Concrete Structures Flaw Detecting Infra-red Camera Moisture Content Density of Soil 温度画像セメントモルタル

项目摘要

1. Flaw detection studies in several building materials based on externally applied thermal field method were carried out, using 20mm thick specimens with two types of artificially simulated defects of sizes ranging from 3mm to 13mm, and a precision hot plate as the heating device. For plastic, gypsum plaster and cement mortar, it was possible to visualize defects which are located within 10mm from the surface, depending on its sizes.2. An heating device utilizing fast circulating hot water could be successfully used for providing favorable thermal field condition on flat surfaces of concrete structures for the purpose of NDT by thermography. Using the device, it was possible to visualize the location of reinforcing bars of diameter of more than 20 mm which are buried within 30mm from the surface.3. Through the study of thermograms of eight cement mortar specimens which were stored in different moisture condition and at a same temperature, i. t was found that the surface temperature tends to be shown slightly lower as the moisture content of mortar increases.4. The variation in density of sand specimens which are compacted in steel containers in various compacting method could be noticed as temperature contrast in the thermograms of the containers, which are simultaneously taken after they are heated in a same condition.

1。在基于外部施加的热场方法的几种建筑材料中进行的缺陷检测研究，使用20mm厚的样品，这些标本具有两种类型的人为模拟的缺陷，尺寸为3mm至13mm，而精度热板作为加热设备。对于塑料，石膏石膏和水泥砂浆，可以根据其尺寸可视化位于距表面10mm以内的缺陷。2。利用快速循环热水的加热设备可以成功地用于在混凝土结构的平坦表面上提供有利的热场状况，以通过热量计学为目的NDT。使用该设备，有可能可视化超过20毫米的钢筋直径的位置，这些直径超过20毫米，距表面30毫米以内。3。通过研究八个水泥砂浆样品的热合器，这些样品存储在不同的水分条件下并且在相同的温度下i。 t发现，随着砂浆的水分含量的增加，表面温度往往略低。4。可以注意到，在各种紧凑方法中，在钢容器中压实的砂样本密度的变化可以注意到容器的热合器中的温度对比度，这些温度对比度在相同条件下加热后同时采用。