KR-102961476-B1 - Method for measuring carbonation depth of concrete structures

Abstract

The present invention relates to a method for measuring the carbonation depth of a concrete structure, and more specifically, to an improved method for measuring the carbonation depth of a concrete structure that prevents the deterioration of concrete by measuring the degree of deterioration when the concrete, although containing alkaline components, undergoes neutralization through oxidation upon contact with carbon dioxide in the air, thereby enabling the safety management of the facility in advance, while protecting the concrete surface through chemical bonding integrated with the surface of the concrete structure and enhancing waterproofing and moisture resistance to block the deterioration of the concrete.

Inventors

• 조은영

Assignees

• (주)고엘

Dates

Publication Date

20260507

Application Date

20241028

Claims (2)

1. delete
2. A method for measuring the carbonation depth of a concrete structure, characterized by comprising: a first step of setting a target sample of concrete to be measured; a second step of setting a measurement cycle for the target sample set in the first step and measuring the target sample according to the set measurement cycle; a third step of storing the measured values from the second step in a database and classifying the degree of carbonation into stages by comparing them with previous measured values; and a fourth step of generating an alarm and outputting a management command when the degree of carbonation exceeds a set range after passing through the third step. The method for measuring the target sample in the second step above includes the process of drilling from the target sample to the rebar, the process of spraying a 1% phenolphthalein solution into the drilled hole, and the process of capturing and saving an image after the spraying; In the third step above, classification is performed by reading the image to determine the carbonation depth, wherein white indicates a pH of 9 or lower, and a change to red indicates a case where the pH exceeds 9, and In order to enhance the watertightness, carbonation resistance, and crack resistance of the above concrete structure, 30 parts by weight of a functional admixture are further added to a known concrete mortar forming the target concrete structure, based on 100 parts by weight of the said concrete mortar, and The above-described concrete mortar is composed of 20% by weight of cement, 25% by weight of sand, 30% by weight of gravel, and the remainder being water, and A method for measuring the carbonation depth of a concrete structure, characterized by using a functional admixture composed of 15 wt% TLA (Trinidad Lake Asphalt), 15 wt% sodium xylene sulfonate, 15 wt% sodium laureth-6 carboxylate, and the remainder n-BMA (n-Butyl methacrylate), wherein the TLA contains 30-40 wt% mineral matter (ash), 10-12 wt% asphaltene, 8-12 wt% fixed carbon, 5-7 wt% sulfur, and the remainder carbon disulfide, and reducing color boundary reading errors by measuring the carbonation depth in a state where the pore structure is stabilized by the functional admixture.

Description

Method for measuring carbonation depth of concrete structures The present invention relates to a method for measuring the carbonation depth of concrete structures within the field of safety diagnosis technology. More specifically, it relates to an improved method for measuring the carbonation depth of concrete structures that prevents the deterioration of concrete by measuring the degree of deterioration when concrete, although containing alkaline components, undergoes neutralization through oxidation upon contact with carbon dioxide in the air, thereby enabling the safety management of facilities in advance; furthermore, it relates to a method that protects the concrete surface through chemical bonding integrated with the surface of the concrete structure and prevents concrete deterioration by enhancing waterproofing and moisture resistance. Carbonation (or neutralization) of concrete refers to the phenomenon in which calcium hydroxide (Ca(OH) ₂ ) in concrete reacts with carbon dioxide ( CO₂ ) in the atmosphere to change into calcium carbonate ( CaCO₃ ) and water ( H₂O ), and as a result of this reaction, concrete that was alkaline (pH = about 12.5) becomes closer to neutral. As the concrete gradually undergoes neutralization due to carbon dioxide in the air and reaches the embedded reinforcing bars, the bars rust, compromising structural safety. Therefore, for safety inspections, the user must regularly perform carbonation tests on concrete structures. The concrete neutralization test measures the carbonation depth of concrete by measuring the depth of the neutralizing portion measured from the surface toward the interior. Use a 1% alcohol solution of phenolphthalein (about 15% water). However, conventional technology related to carbonation testing involves the inconvenience of separately applying a reagent to 'litmus paper' and attaching the 'litmus paper' to the rotating plate of the inspection device once the reagent application is complete. Additionally, there is another problem in that concrete powder scattered during the inspection process is prevented from flying outward by the windbreak but instead mixes with the 'litmus paper' later and adheres to it, thereby reducing the accuracy of the inspection. Hereinafter, preferred embodiments according to the present invention will be described in more detail. Prior to describing the present invention, the following specific structural or functional descriptions are provided merely for the purpose of illustrating embodiments according to the concept of the present invention. Embodiments according to the concept of the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. In addition, since embodiments according to the concept of the present invention may be subject to various modifications and may take various forms, specific embodiments are to be described in detail in this specification. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. A method for measuring the carbonation depth of a concrete structure according to the present invention comprises: a first step of setting a target sample of concrete to be measured; a second step of setting a measurement cycle for the target sample set in the first step and measuring the target sample according to the set measurement cycle; a third step of storing the measured values from the second step in a database and classifying the degree of carbonation into stages by comparing them with previous measured values; and a fourth step of generating an alarm and outputting a management command when the degree of carbonation exceeds a set range after passing through the third step. At this time, the method of measuring the target sample in the second step above is as shown in the figure below, It includes the process of drilling from the target sample to the rebar, the process of spraying a 1% phenolphthalein solution into the drilled hole, and the process of capturing and saving an image after the spraying. And, in the third step above, classification is performed by reading the image to determine the carbonation depth, where white (no change) means that the pH is 9 or lower, and red change means that the pH is greater than 9, so carbonation information is read by checking whether this change has occurred. Of course, the carbonation depth is determined using the formula for the neutralization rate (example below), but since this is a known formula, it is introduced only as an example by quoting it, and in most cases, the computer will automatically calculate it if you just set the conditions using video images. (Example of a formula) In other words, the above formula is merely an example for refer