Research on the durability estimation technique by the quantification of concrete deterioration

本研究的目的是开发一种方法，强度，量化混凝土退化和抗冻融性能的评价，使用X射线技术与对比介质。为了估计混凝土的强度，制作了水灰比不同的混凝土试样，并需要通过X射线技术用造影剂获得的渡越剂量和抗压强度之间的关系。在该实验中，还进行了使用非引气混凝土和砂浆作为对比材料的测试。并且，对混凝土进行了类似的实验，其中动弹性模量因冻融作用而变化。实验结果表明，用X射线技术测量砂浆、混凝土和引气混凝土的透射剂量，可以估算劣化引气混凝土的各项强度和相对动弹性模量。为了估计混凝土的劣化，用对比剂的X射线技术进行AE混凝土试样，其中细裂纹已发生的冻融作用。检测细裂纹在此AE混凝土试样和量化的混凝土退化进行。接着，对砂浆、非AE混凝土和AE混凝土的试样进行相同的方法，以检查放射性透皮剂剂量与抗冻性和解冻性之间的关系。此外，该方法进行的结构，以量化混凝土退化和评估抗冻融性。本研究的结果，混凝土的强度和量化的混凝土退化能够估计通过X射线技术与造影剂。这些都是重大成果。

The purpose of this study is to develop a method for strength, quantification of concrete degradation and evaluation of freeze-thaw resistance using X-ray technique with contrast medium. In order to estimate the strength of the concrete, the concrete specimen from which the water cement ratio differed was produced, and the relationship between the transit dose and compression strength obtained by X-ray technique with contrast medium were required. In this experiment, a test using non-air entrained concrete and mortar was also carried out as a comparison material. And, an experiment was similarly carried out for the concrete in which the dynamic elastic modulus was made to change by the freezing and thawing action. As a result of the experiment, the estimation of each strength and relative dynamic elastic modulus of deteriorated air entrained concrete became possible by measuring the transit dose by X-ray technique with contrast medium for mortar, concrete and air entrained concrete. In order to estimate the deterioration of the concrete, the X-ray technique with contrast medium was carried out for AE concrete specimens in which fine cracks had occurred by a freezing and thawing action. Detection of fine cracks in this AE concrete specimens and the quantification of the concrete degradation was carried out. Next, the same method was carried out for specimens of mortar, Non-AE concrete and AE concrete, to examine the relationship between the radioparency dosage and the resistance to freezing and thawing. In addition, this method was carried out for the structure to quantify the concrete degradation and to evaluate the freeze-thaw resistance. Result of this study, the strength of concrete and quantification of concrete degradation are able to estimate by X-ray technique with contrast medium. These are big result.