In this study, Blast furnace-based has been manufactured by utilizing recycled aggregates and gypsum as alkali activator. Comparing with the common geopolymer concrete, Using recycled aggregates and gypsum as activator could be identified to applied in low strength concrete.

This study designs RC frame specimens with existing brace retrofit system and conduct experiment. Using the resultant data, it try to analyze structural performance of the brace system and suggests preliminary data for new shape buckling-restrained braces.

In this study, the necessity of shear reinforcement for one-way voided slab is verified through the experiment. The shear reinforcement for one-way voided slab needs to be considered for improvement of its structural performance, according to analysis results about the shear strength and the failure mode of its specimens.

This research investigated the pullout behavior of high strength polypropylene fibers. Test results showed that the frictional bond between polypropylene fiber and cement matrix of water to binder ratio 0.23 is 0.2 MPa

Recently, ecosystem restoration is absolutely necessary for fishes in the shallow rivers. In case of water overflows by typhoon, 3D-analysis by SAP2000 software is required for designing of natural type of fish passage in order to settle its problems regarding the degradation of the concrete durability.

3D-analysis by SAP2000 software is required for designing of sea pools in order to settle the problems regarding the degradation of the concrete durability. Sea pools are faced with sea water including salts so it is used high strength concrete, reinforced high strength and urethane for its construction. The purpose of this paper is to establish specifications and data for the construction of the sea pools.

Theoretical modeling is presented for the prediction of prestress loss of strands during the steam curing process. The model comprises heat transfer model, bond-slip model at elevated temperature and micromechanical model for prestress loss. The model was able to predict the experimentally measured prestress loss in a reasonable accuracy.

In this study, chemical resistance of sulfur polymer was evaluated for surface protection of structures required chemical resistance. From the test result, the mix proportion contained 10% of fly ash and 10% of silica sand which used as a filler to reduce shrinkage showed small reduction of bond strength and good chemical resistance.

In this study, bonding property between the hardened concrete and sulfur polymer was evaluated by pull out test. The test results were shown that moisture condition on the concrete decreased the bonding strength between concrete and sulfur polymer.

In this study, in order to confirm whether the deterioration of the concrete structure in contact with ozone and establish a countermeasure for the deterioration, the test of concrete in ozone were conducted by using a few concrete specimen that is fitted to the capacity of the test equipment.

The purpose of this study was to effects on flexural performance of SFRC prism with different fiber volume fraction. The test variables such as aggregate maximum size(8, 13, 20mm) and steel fiber volume faction(0, 1, 2%). Specimen size is 100×100×400mm and tested in for points loading. Test results indicated that increase the fiber volume fraction increase with flexural strength and smaller aggregate size more than higher performance with concrete.

The behavior of foundation, which is supported by steel pile, is dependant to joint configurations pile caps and basement concrete. As a part of investigation on the behavior of pile cap foundations, this study evaluated the behavior of infill concrete in a steel pile that had a non-slip device inside with a full-scale loading test.

This paper presents an isoparametric formulation for three dimensional transition finite element, especially the solid-flat shell transition element. The proposed solid-flat shell transition element is composed of the solid element with 8 nodes, 3 d.o.f and the flat shell element with 4 nodes, 6 d.o.f for simple formula derivation and the usefulness of practical applications.

With the recent decreasing of available land, the usage of underground for constructing underground parking lots, subway, underground shopping centers and roads is becoming more frequent than before. Subsequently, due to the changes of the ecosystems and the depletion of ground water in the underground environments are being negatively affected due to coming into contact with corrosive and hazardous substances. In particular, the durability, safety and convenience of the people who reside or utilize these underground structures are reduced by the environmental problems originating from underground ecosystems. Currently there exist a large number of on-going topics of discussion intended to solve the problems, but in order to consolidate a proper and standardized procedure of maintaining waterproofing techniques for these underground structures, a testing method to evaluate the performance of waterproofing and waterleakage resistance in underground structures is necessary.

In this study, we confirmed the presence of hydrophilic carboxylic group to the surface of the CNT when it was treated with sulfuric acid and nitric acid to improve the bonding performance between CNT and cement paste in CNT-cement composites. Furthermore, the changes in fluidity and strength due to the acid treatment was also estimated.

In this paper, Considered the foundation reinforcement to support the existing building for extending underground parking lot. Pile installing methods at inside and outside of building, pile cap connection between pile head and existing foundation and static pile load test is accomplished.

According to NEI 07-13 R8, in aircraft impact analysis for new plant design, global structural damage of the target structure can be evaluated analytically using one of the following methods of evaluation: 1) Force time-history analysis method. 2) Missile-target interaction analysis method. It depends on the availability of data on the dynamic characteristics and the intended level of detail of analysis. The purpose of this study is to evaluate the effect on the analytical results of the aircraft impact analysis method. Several impact analyses using various method were performed for the simplified external SC wall of the APR+ nuclear power plant structure.

The composite beam is efficient and easy to construction. But shear connector is needed for the composite action. This research developed SPC beam in order to reduce the shear connector with utilization of mechanical bonded force by the cross sectional shape. The flexural behavior of SPC beam was evaluated through two point loading test.

The first ultra-high performance concrete (UHPC) bridge Deck in Korea was constructed by KICT. Thrice field tests were performed to estimate the structural performance of this bridge. As a result, this bridge has sufficient safety and serviceability as a highway bridge.

Based on the study of chloride migration coefficient and hydration heat evolution, it was found that the use of ternary blended cement was effective to achieve desired service life and minimum crack index. On the other hand, a high level of compressive strength is required for marine concrete mix design.