• Journal of the Korean Recycled Construction Resources Institute
• /
• v.12 no.1
• /
• pp.102-109
• /
• 2024

In order to use limestone powder as a material for concrete, the mechanical and durability characteristics of cement matrices manufactured by varying the substitution rate were evaluated. In general, limestone powder did not contribute to the cement hydration reaction, so as a result of the compressive strength test of cement mortar using it, the compressive strength decreased as the substitution rate increased. However, as a result of evaluating the durability performance of cement mortar using limestone powder, such as chloride ion penetration resistance, carbonation resistance, and chemical attack resistance, small particles of limestone powder showed superior results compared to the unsubstituted control mortar due to the micro-filler effect of filling the fine pores inside the cement matrix. Therefore, limestone powder is expected to be used as an effective method for improving the durability of concrete. In this study, the durability was evaluated by changing the mixing amount of limestone powder to 0 %, 5 %, 10 %, and 15 %, but it is judged that it is necessary to study in more detail the effect on the durability by changing the end and mixing amount of limestone powder to various levels in the future.

• Journal of the Architectural Institute of Korea Structure & Construction
• /
• v.34 no.11
• /
• pp.37-43
• /
• 2018

According to the evaluation of basic properties and mechanical characteristics of polymer cement mortars that contain re-dispersible type polymer, in the case of fresh mortars, flow and air content were increased due to the dispersion action of entrained air and surfactant with an increase of polymer addition ratio. In the case of mortars after hardening, flexural strength, bonding strength, absorption rate and carbonation resistance were improved due to the increased union and waterproof characteristics of internal structures as a result of the formation of polymer film.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2022.04a
• /
• pp.259-260
• /
• 2022

In this study, as part of a study to solve the problem of aggregate supply and demand, blast furnace slag fine aggregate and ferronickel slag fine aggregate were used as substitutes for natural fine aggregate, and a bioinspired polymer, a catechol-functionalized chitosan, was used instead of the mixing water.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2020.06a
• /
• pp.195-196
• /
• 2020

This study evaluated the mechanical properties and alkali silica reaction of mortar according to the mixing ratio of waste glass. As a result, as the mixing ratio of the waste glass increased, the compressive and flexible strength of the mortar decreased due to the slip of aggregate, and the alkali-silica reaction(ASR) increased. So, it is considered that research is needed to prevent slip and ASR of the waste glass aggregate in order to use the waste glass as a fine aggregate for concrete.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2023.11a
• /
• pp.139-140
• /
• 2023

This study aims to determine the microstructural characteristics of waste glass beads, a lightweight aggregate manufactured from waste glass powder, when incorporated into mortar in order to examine its usability depending on the particle shape.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.27 no.4
• /
• pp.78-85
• /
• 2023

In this study, synthetic fibers were applied to reduce shrinkage cracks that may occur in mortar produced by 3D printer. We used a biopolymer in powder form made from cactus stem (CS) as an admixture. The material properties of 3D printed mortar were experimentally evaluated. Replacing methylcellulose(MC) with 10% CS increases compressive strength by 9.84-23.92% regardless of the casting method. In addition, regardless of the casting method, shrinkage change, freeze-thaw resistance, and crack resistance are more effective than Plain. Incorporation of CS increases the polysaccharide macromolecular structure and improves durability. Mortars reinforced with synthetic fibers do not affect compressive strength and freeze-thaw. It is also effective for shrink deformation and crack resistance. Incorporating CS and fibers from 3D-printed mortar was found to be effective for durability and crack resistance.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2022.04a
• /
• pp.257-258
• /
• 2022

In this study, as a part of the study to alleviate the durability degradation due to low tensile performance and cracking of concrete, two kinds of catechol functional chitosan (Cat-Chit) were replaced at a ratio of 5, 10, 15, 20% as a mixed water substitute to evaluate the fluidility and strength characteristics of mortar.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2022.04a
• /
• pp.99-100
• /
• 2022

This study analyzed the basic characteristics of mortar using CGS modified by pretreatment. As a result of the analysis, it was found that CGS after reforming can be partially replaced with fine aggregates to solve the existing air volume reduction problem when used, and can contribute positively in terms of securing fluidity and improving strength. Therefore, it is considered necessary to verify as a functional material of CGS through concrete durability experiments as a future task.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2016.10a
• /
• pp.45-46
• /
• 2016

As coal fly ash emissions have increased due to additional constructions of domestic heat power plants, the amount of embedded reject ash (Rj henceforth) is increasing as well. Most Rj is embedded, so if it is used as an alternative admixture instead of cement, embedded quantities will decrease, leading to economic and environmentally positive effects. Therefore this study conducted an experiment to contemplate the usability of Rj ground in the Los Angeles abraser, and what effects ground Rj has on the engineering properties of high compressive strength mortar. The result was that as the number of grinding turns increased, liquidity, air quantity and intensity were improved, proving Rj a possible alternative admixture to cement.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2019.11a
• /
• pp.83-84
• /
• 2019

Recently, the supply and demand of aggregates has become difficult due to various practical constraints such as depletion of natural aggregate resources and tightening environmental regulations. As a result, aggregates such as selective crushed aggregates and river aggregates are now distributed to the construction market. In particular, among the aggregates distributed in the country, selective crushed aggregates that have been used recently are characterized by the fact that the quality of the raw material is not uniform and is based on geological characteristics. Such bad aggregates can affect the overall performance of the concrete and shorten the life of the structure. Therefore, in this study, in order to improve such problems, we want to analyze the effect of aggregate powder on mortar.