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

本研究的目的是建立一种利用X射线技术和造影剂进行混凝土强度、混凝土退化量化和抗冻融性能评价的方法。为了估计混凝土的强度，制作了不同水灰比的混凝土试件，并需要通过X射线技术和造影剂获得的过渡剂量与抗压强度之间的关系。在本试验中，还进行了非引气混凝土和砂浆作为对比材料的试验。对冻融作用使混凝土动弹模值发生变化的混凝土进行了类似的试验。试验结果表明，用X射线技术测量砂浆、混凝土和引气混凝土的透过量，可以估算劣化引气混凝土的各项强度和相对动弹模数。为了评价混凝土的劣化程度，对冻融作用下产生细小裂缝的AE混凝土试件进行了对比剂X射线检测。对试件中的细小裂缝进行了检测，并对混凝土的退化情况进行了量化。接下来，对砂浆、非声发射混凝土和声发射混凝土的试件进行了相同的方法，以考察辐射剂量与抗冻融性能的关系。此外，还将该方法应用于该结构，以量化混凝土退化和评价其抗冻融性能。本研究的结果是，可以用对比剂X射线技术来估计混凝土的强度和混凝土退化的量化。这些都是巨大的成果。

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.