golnaz moghimi - Academia.edu (original) (raw)

Papers by golnaz moghimi

Since ancient time, fiber reinforced concrete has been replaced with plain concrete which is brit... more Since ancient time, fiber reinforced concrete has been replaced with plain concrete which is brittle material. Although, the inclusion of single type fiber may improve mechanical properties of concrete, the hybridization can compensate the disadvantages of two fiber types and represent their advantages. This thesis explores the effect of using steel fiber and polypropylene fiber for reinforcing the concrete to quantify the mechanical properties of concrete matrix. For this purpose, 45 specimens of fiber reinforced concrete which contains different fibers dosage were casted. All mixes were tested for slump and VeBe test in fresh state, and 28 days compressive strength, flexural strength and impact resistance tests were carried out in hardened state. According to the test results, the regression analysis was carried out to predict the value of compressive strength, flexural strength and impact resistance. The experimental results show that the hybrid form of fiber has slight effect on compressive values, while it causes increase in modulus of rupture, toughness and impact resistance values.

iii Since ancient time, fiber reinforced concrete has been replaced with plain concrete which is ... more iii Since ancient time, fiber reinforced concrete has been replaced with plain concrete which is brittle material. Although, the inclusion of single type fiber may improve mechanical properties of concrete, the hybridization can compensate the disadvantages of two fiber types and represent their advantages. This thesis explores the effect of using steel fiber and polypropylene fiber for reinforcing the concrete to quantify the mechanical properties of concrete matrix. For this purpose, 45 specimens of fiber reinforced concrete which contains different fibers dosage were casted. All mixes were tested for slump and VeBe test in fresh state, and 28 days compressive strength, flexural strength and impact resistance tests were carried out in hardened state. According to the test results, the regression analysis was carried out to predict the value of compressive strength, flexural strength and impact resistance. The experimental results show that the hybrid form of fiber has slight effec...

Construction waste has been gradually increased as a result of upsizing construction projects whi... more Construction waste has been gradually increased as a result of upsizing construction projects which are occurred within the lifecycle of buildings. Since waste management is a major priority and has profound impacts on the volume of waste generated in construction stage, the majority of efforts have been attempted to reuse, recycle and reduce waste. However, there is still room to study on lack of sufficient knowledge about waste management in construction industry. This paper intends to provide an insight into the effect of project management knowledge areas on waste management solely on construction stage. To this end, a survey among Iranian building construction industry contractors was conducted to identify the effectiveness of project management knowledge areas on three jobsite key factors including 'Site activity', 'Training', and 'Awareness'. As a result, four management disciplines were identified as most influential ones on amount of construction was...

iii OZ iv DEDICATION v ACKNOWLEDGMENT vi LIST OF TABLES ix LIST OF FIGURES x LIST OF ABBREVIATION... more iii OZ iv DEDICATION v ACKNOWLEDGMENT vi LIST OF TABLES ix LIST OF FIGURES x LIST OF ABBREVIATIONS xii LIST OF SYMBOLS xiii

Background: The purpose of our study was to determine the effect of N-acetylcysteine (NAC) admini... more Background: The purpose of our study was to determine the effect of N-acetylcysteine (NAC) administered after successful cardiopulmonary resuscitation (CPR) on renal function of the survived patients. Methods: In this double-blinded randomized clinical trial, 44 patients who experienced cardiopulmonary arrest and underwent successful cardiopulmonary resuscitation (CPR) were entered into the study. They were randomly divided into two groups. One group received NAC (150 mg/kg) and the control group received normal saline (NS). Results: Serum levels of blood urea nitrogen (BUN), creatinine, and neutrophil gelatinase-associated lipocalin (NGAL) were significantly lower in the NAC group when compared to the NS group at 6, 12,24, 48, and 72 hours after resuscitation. However, alanine aminotransferase (ALT), cardiac troponin, creatine kinase MB fraction (CK-MB) and arterial blood gases did not differ between the two groups. Conclusion: We observed significantly lower serum levels of BUN, c...