The purpose of this study is to estimate the compressive strength according to the age of the concrete structure using ultrasonic pulse velocity method. If the correlation between the ultrasonic pulse velocity and the compressive strength according to the age is derived, the compressive strength of the early age of the concrete structure can be estimated at the new construction site and the compressive strength of the existing structure can be estimated at the remodeling construction site. Concrete structural specimens were constructed with 123 specimens by setting 9 parameters based on the design compressive strength of 24, 30, 40 MPa at 16, 20, 24, 48, 72, 120, 168, 360, 672 h. For the calculation of the average ultrasonic velocity according to the age of concrete, it is carried out according to KS F 2731, ASTM C597 and ACI 228-2R, and the concrete compressive strength is carried out according to KS F 2405. From correlation between ultrasonic pulse velocity and compressive strength, this experiment suggests compressive strength estimation equation. The proposed estimation equation confirmed that it is possible to estimate the compressive strength of concrete according to its age using nondestructive test methods.
Windows have significant effects on heating and cooling energy in buildings due to the fact that windows are the thermally weak parts among the building constructions and that they can directly transmit the solar radiation into the room space. Therefore, proper selection of window materials and blind operation type is an essential factor for energy saving. One of the advanced window systems that has been actively applied these days is low-E windows, whose thermal efficiencies are improved compared to the conventional clear windows by applying the low emissivity coating, resulting in lower solar heat gain coefficient and U-value. In addition, proper operation of blinds can also significantly reduce the thermal load and energy consumption in buildings. In this study, experimental research was performed to evaluate the inside air and surface temperature characteristics of six small-scale test chambers during cooling period, since those temperatures can be good indicators for the indirect assessment of the cooling effects of different window types and blind locations.
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