In this study, KS F 2405 was used to investigated the compressive strength of property of high performance concrete (HPC) using the fly ash and silica fume. The experiments were carried out silica fume-binder ratio from 5% (SF5) and fly ash 25%+silica fume 5% (FA25SF5). The compressive strength of HPC determined on 7days and 28days.

Nonlinear crack analysis was carried out to estimate crack behavior for caisson structures in various conditions such as wave load, salt attack and temperature change etc. Some kinds of modeling techniques were used to estimate exact solution with MIDAS FEA considering creep and drying shrinkage.

This study examined the setting time of Free-cement concrete and Ordinary Portland Cement(OPC). Alkali Activators(NaOH, KOH, CaOH2) were mixed when free-cement concrete was cast. Five different concentration levels of Alkali activator was used, ranging from 0.5%, 1.0%, 1.5%, 2.0%, and 3.0% by weight of binder.

In this study, the hydration heat of cementless mortar containing FGD gypsum is investigated experimentally. According to research results, it was found that using cementless binder is more convenient to apply to secondary product of concrete than ordinary portland cement.

The possibility to determine the setting time of cement paste using the electrical impedance response of early-age hydrating cement paste is investigated. Electrical impedance responses of cement paste are continuously measured immediately after mixing and during hydration process. Measured responses are then analyzed and compared with temperature responses of hydrating cement paste.

This study was performed an evaluation of physical & mechanical properties of mortar by Non-Sintered binder of ball milling time according to fineness.

Deep corrugated steel plate structure has more compressive force and flexibility in bending behavior than short span structure. Asymmetric earth pressure distribution has occurred during construction. Ultimate strength and moment in domestic area, having superior ability at bending strain has been examined in this study. Based on the result of the study preceded, performance of Deep corrugated steel plate specimen has been evaluated by comparing increase of strength according to the increase of reinforcement content in bolt connections and failure mode of specimen

This work was intended to test the collision of a 14-ton truck with a concrete protection wall and thus analyze fracture behavior of a protection wall. And, this work investigated fracture phenomena by modeling concrete protection walls in different levels of stress with the use of LS-DYNA. In addition, it analyzed fracture behavior of a protection wall by modelling concrete protection walls in the different installation heights of wire-mesh.

This paper presents the image processing technique for analyzing quantitatively air voids in paste. From the test, the performance of proposed technique was verified.

Existing polyurethane occurred the environmental issues with the volatile organic solvent mixing tar. This study evaluates the basic properties of a rapid hardening polyurethane, available with spray construction, modified with polyamine mixing carbon black. As a result, stable basic property is measured even surpassed KS.

Korea is a peninsula which has a lot of soft ground including coastal areas. This soft ground is consisted of clay or silt and it generally has features of high compressibility. Therefore, in order to build a structure, high compressibility ground is needed carrying out ground improvement using deep cement-mixing method. As a Fig 1, this study is evaluated for the applicability of which are load sharing ratio, stress distribution ratio, pore water pressure and settlement with grid structure form

The purpose of this study is to evaluate bond strength between sulfur polymer coating material and old concrete. Two kinds of spray casting methods are selected and compared to its bond strength by conducting bond test and measuring available casting time. As a result, the bond strength and available casting time is considerably depends on spray casting method.

This study was performed mechanical properties of porous concrete according to fiber mixing conditions. As the results of study, When considering the void ratio, compressive and flexural strength of porous concrete, the proper type and content of fiber is thought to be PVA 0.05%.

Greenhouse gas emissions, ranking the world's top 10 ranked Korea in the development of the related technologies and the relevant laws and the formulation of plans in 2008 to a low-carbon, green growth a new vision of national growth is accelerating. In addition, Cement substitute material developed using high-performance concrete cement reduction technology, carbon capture technology is being studied. Therefore, in this study, utilizing activated industrial byproducts carbon Absorbing for road materials developed as part of the study typical industrial byproducts, Blast Furnace Slag and calcium hydroxide, sodium silicate mortar on Fundamental Properties of experiments the flow experiments, the compressive strength experiments performed basic experiments with respect to the results obtained were investigated

Electrochemical treatments have been applied to many concrete structures. However, excessive current density degrades the bond strength by the change of microstructure at the steel-concrete interface. In this study, the optimal current density of electrochemical treatment without a influence on the bond strength could be derived from related literatures.

Due to special chemical environment, sulfuric acid can be produced in sewerage system. This sulphuric acid may react with hardened cement paste and originate expansive products which can induce swelling and disaggregation of concrete. Therefore, the aim of this paper is to study the strength and acid resistance properties of cementless restorative mortar

The purpose of this study is to evaluate the flexural property of semi-rigid pavement which is poured sulfur polymer emulsion into permeable open graded asphalt secured 15∼20 percentage ranges of porosity. From the bending test result, it was found that the flexural strength of the semi-rigid specimens were evaluated approximately 432% higher than that of the open graded asphalt specimens. And the strain of maximum load point was 38.8% lower than that of the open graded asphalt specimens.

The purpose of this study is to evaluate the flexural performance of a SHCC (Strain Hardening Cementitious Composites) panel which was manufactured by steam curing method for precast slab system. From the bending test result, it was found that the SHCC panel showed approximately 7.32 MPa of maximum flexural strength, 58 mm of mid-span deflection appearing excellent strain hardening behavior and multiple micro cracks between bending moment section of the specimen.

In this study, various difference sizes of lightweight fine aggregates were used to make concrete specimens. The pressure waves, ultrasonic velocity and maximum frequency were measured for the specimens. Initial ultrasonic velocities were influenced by the sizes of lightweight fine aggregates, but not by the maximum frequency bandwidth.

Ultrasonic pulse velocity method is widely used to evaluate the internal condition of concrete without loss of the structural integrity. In this study, the specimens were made for the varying the lightweight fine aggregates replacement rate of 0, 50, 100%. These specimens were used to measure the ultrasonic velocity and maximum frequency were analyzed. As Lightweight fine aggregates substitution rate was increased, the ultrasonic velocity and the maximum frequency bandwidth were also increased