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As urbanization progressed along with quantitative expansion of the construction industry, concrete has developed diversely as a material that is the most extensively used in the construction industry. However, aggregate resources that are an essential element of concrete production are gradually being depleted and the phenomenon of aggregate shortage has been intensifying due to the reinforcement of regulations on environmental issues. Therefore, in the present study, environment friendly mortar was made by replacing aggregate with mud that is dumped when dredging sand is dumped. To identify the dynamic characteristics of the mortar and to identify its fire resistance efficiency, the mortar was heated and its residual compressive strength was measured. In the results, the residual compressive strength values of MM1, MM2, and MM3 were 45%, 95%, and 57.7% respectively and the mix MM2 showed the highest fire resistance efficiency. 건설산업의 양적팽창과 함께 도시화가 진행되면서 콘크리트는 건설재료로서 가장 많이 사용되는 재료로서 다양한 발전을 해왔다. 하지만 콘크리트를 제작하는데 필수 요소는 골재자원이 점진적으로 고갈되고 있으며며 환경문제에 대한 규제의 강화로 인해 골재부족현상은 갈수록 커지고 있는 실정이다. 이에 따라 본 연구에서는 준설토 투기로 인해 버려지는 갯벌을 골재로 치환하여 사용한 친환경 모르타르를 제작하여 그 역학적 특성을 규명하고 또한 내화성능을 확인하기 위해 가열을 한 뒤 잔존압축강도를 측정하였다. 그 결과 MM1, MM2, MM3의 잔존압축강도는 각각 45%, 95%, 57.7%의 강도를 발현하였으며 MM2의 배합에서 내화성능이 가장 우수한 것으로 나타났다.
본 연구에서는 생갯벌을 잔골재 대신 치환한 모르타르의 물리적 특성에 대한 실험을 진행하였다. 플로우 측정결과 시멘트와 잔골재의 배합비가 높을수록 플로우 값이 증가하였으며, 생갯벌의 치환율이 감소할수록 플로우값이 감소하는 것으로 나타났다. 염화물 함유량 측정결과 생갯벌의 치환율이 감소할수록 염화물 함유량 또한 감소하는 것으로 나타났다. 압축강도 측정결과, 대부분의 배합비에서 생갯벌의 치환율이 감소할수록 압축강도는 반비례하여 증가하는 것으로 나타났다. 인장강도 측정결과, 압축강도와 비슷한 경향을 나타냈다. 그리고 생갯벌 치환율이 감소할수록 강도가 증가하는 것으로 나타났다. In this study, we examined the physical properties of cement mortar by replacing a part of the amount of fine aggregate in moist mud flat. Flow measurement results show that the flow value increases as the mixing ratio of cement and fine aggregate increases and the flow value decreased as the replacement ratio of moist mud flats decreased. Chloride contents were also found to decrease with decreasing substitution rate of moist mud flats. As a result of the compressive strength measurement, the compressive strength increased in inverse proportion as the displacement ratio of moist mud flats decreased in most mixing ratio. As a result of tensile strength measurement, the tendency was similar to compressive strength and the intensity increased as the replacement ratio of moist mud flats decreased.
Recently, industrial accidents have been causing great damage to enterprise management directly or indirectly, and the industrial injuries of conventional type are decreasing, on the other hand, musculoskeletal Injuries are trending toward a rapid increase. This study evaluated the compression force at the L5/S1 disc using IEMG(Integrated Electromyography). IEMG values were analyzed under the condition of fixed vertical factor, two horizontal factors, and 2 times per minute for the stoop posture. Though there are not significant differences on the analysis result of IEMG values between right and left erector spinae muscle, there are significant differences between horizontal distance 35cm and 55cm. This result shows that the motor units of erector spinae muscle increase as the horizontal distance increases. Therefore, decreasing the horizontal distance to decrease compression force at L5/S1 is important on preventing a low back pain.
This study evaluated the compression force at the L5/S1 disc using back strength and IEMG(Integrated Electromyography). We divided the distance into one-half, three-fourth and full, measured the back strength. The results showed significant difference much among the cases. IEMG values were analyzed under the condition of fixed vertical factor, two horizontal factors, and 2 times per minute for the stoop posture. As the result, there are significant differences between horizontal distance 35cm and 55cm. This result showed that back strength decreased and the motor units of erector spinae muscle increased as the horizontal distance increased. Therefore, decreasing the horizontal distance to decrease compression force at L5/S1 is important on preventing a low back pain. Also, by using these data for prediction musculoskeletal disorders if we design equipment, machine and apparatus for human welfare, we can give advantage of prevention of low back pain much. We will be able to apply these data to work method or workplace lay-out.
Recently, industrial accidents have been getting great damage to an enterprise management directly and indirectly, the industrial injuries of conventional type are decreasing : on the other hand, musculos-keletal injuries are trending to a rapid increase. This shows that most of carrying works have been performing in almost all production process and convey objects, machine equipment and work method. Then, they are made by unfitted design which doesn't consider physical condition of workers, so it causes them to bring about forceful motion. In this paper, it was used NIOSH standard the data of spot. The ergonomic design of machine equipment and the evaluation of biomechanical compression force at the L_5/S₁ and back power, intend to provide the basis which can be applied, compared, and analyzed between before process improvement and after.
The purpose of this study was to quantitatively prove the asymmetric lifting acts on the risk factor of low back pain by a comparison of muscle activities of spinal loading and muscle strength(hand grip and back strength) between two types of lifting tasks(symmetric and asymmetric). Fourteen male subjects were participated in the experiment. We analysed and compared hand grip force, back strength, EMG(Electromyography), and IEMG(Integrated Electromyography) values for the stoop posture between symmetric and asymmetric lifting tasks using paired t-test. As the result, the back strength decreased in twisting posture. According to the result of EMG analysis, there were significant differences between right and left erector spinae muscle in asymmetric lifting task regardless of load. When subjects lifted boxes of right side, EMG values of left muscle were higher than those of right muscle. As twisting angle increased, EMG values of left muscle increased and EMG values of right muscle decreased. The results of IEMG analysis were similar to the results of EMG analysis. The results of EMG values during lifting indicated that the take-of stage was most stressful.