• Journal of the Korea Institute of Building Construction
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• v.24 no.1
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• pp.1-10
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• 2024

In-situ carbonation technology represents a form of mineral carbonation that integrates CO₂ into the fabrication process of cementitious construction materials, capturing CO₂ as calcium carbonate(CaCO₃) through a reaction between calcium ions(Ca²⁺) and CO₂ released during cement hydration. This investigation examines the application of in-situ carbonation technology to a variety of floor dry cement mortar formulations commonly used in local construction projects. It assesses the effects of varying the CO₂ injection flow rate and total volume of CO₂ injected. Additionally, the study evaluates the impact of reducing the quantity of cement used as a binder on the final product's quality.

• Journal of the Korea Institute of Building Construction
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• v.21 no.3
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• pp.181-188
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• 2021

In this study, the various performance of dry cement mortar for Korean floor heating system depending on water-to-dry mortar ratios (W/DM) applied in project site was evaluated. According to the experiment conducted, the importance of mixing water for dry cement mortar was revealed by resultant performance or quality of the dry cement mortar for floor finishing by changing W/DM controlled in project site by workers. As the general trend, the flow was increased, and the unit volume weight was decreased with increasing W/DM. Additionally, compressive strength and drying shrinkage were significantly influenced by W/DM. Hence, it can be stated that the adding water for dry cement mortar should be managed precisely since excessively increased W/DM for workability improvement can cause performance degradation of floor mortar with the failures such as excessive bleeding, and severe segregation during the fresh state. As a summary of the study, to achieve a desirable performance of dry cement mortar, approximately 20 % of W/DM can be suggested to be managed in project site.

• Magazine of the Korea Concrete Institute
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• v.8 no.3
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• pp.167-175
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• 1996

Recently, the mortar crack on floor is very serious in construction field, e.g. the crack due to plastic shrinkage and the crack due to drying shrinkage. To prevent this kind of crack, optimum mix proportions not only satisfying the required workability but also minimizing the unit water content were selected. And the expansion admixtures were used to compensate shrmkage of mortar. The water /cement ratio used in construction field is about 64% by the investigation. Even if the water /cement ratio of mortar is reduced, floor mortar is still able to have the required workability by the appropriate use of the fine aggregate with high fineness mo'dulus and superplastizer. The equations hetween mortar flow and water /cement ratio, sand /cement ratio, fineness modulus of fine aggregate were proposed in this study. And the proposed equation may provide available mix proportions of floor mortar.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.377-378
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• 2023

This study examined the effect of curing conditions on the compressive strength of dry mortar for floor. The compressive strength according to the relative humidity during curing was compared, and the influence of expansive additives on compressive strength under water curing was reviewed. As a result, low relative humidity conditions during curing was not effective in improving the compressive strength of dry mortar for floor, and it was judged that the continuous hydration reaction insufficient due to lack of the moisture supply. In order to improve compressive strength, high relative humidity maintenance was found to be an important factor. However, under water curing conditions, the compressive strength has decreased as a result of continuous volume expansion due to the use of the expansive additives.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.445-446
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• 2009

This study investigated properties of blast furnace slag from various areas and fundamental properties and length change on the case that the blast furnace slag was applied to surface coating dry-mortar.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.11a
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• pp.157-158
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• 2022

A problem arose about the lack of strength of dry mortar for flooring. To solve the problem of lack of strength, a high-strength dry mortar was applied. However, problems arose about the increase in the amount of cracks. It is necessary to analyze the causes of the increase in the amount of cracking in high-strength dry mortar and take countermeasures.