TY - JOUR ID - 125156 TI - Utilizing the Modified Popovics Model in study of effect of water to cement ratio, size and shape of aggregate in concrete behavior JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Haj Seiyed Taghia, S.A AU - Darvishvand, H.R. AU - Ebrahimi, M. AD - Department of civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran AD - Engineering Technology Department, South Carolina State University, SC, USA Y1 - 2021 PY - 2021 VL - 34 IS - 2 SP - 393 EP - 402 KW - Aggregate KW - water to cement ratio KW - Stress-Strain Test KW - Correlation coefficient KW - Variation Coefficient KW - Percentage of Change in Energy Absorption DO - 10.5829/ije.2021.34.02b.11 N2 - Three parameters, size, shape of aggregate, and water to cement ratio, play important role on concrete behavior. To study the effect of these parameters, two types of aggregates were used, rounded (river) and sharped corners (broken). The maximum sizes of aggregates were chosen to be 9.5, 12.5, 19 and 25 mm for water to cement ratio were 0.35, 0.42, 0.54 and 0.76. In this investigation, the total of 32 mixed designs were made. The stress-strain tests were performed on the entire samples, and the results were compared with the Popovics model. To further evaluate the analysis, three criteria, correlation coefficient, variation coefficient, and percentage of change in energy absorption were demonstarted. Analysis showed that there is significant differences between the Popovics model and our experimental results. The Modified Popovics model was introduced for better understanding the concrete behavior in compression. The proposed model covered a wide range of the parameters concerned in this investigation. The Modified Popovics model was comapred with several models such as the Popovics, Hognestad, Thorenfeldt, and Tsai and the results showed that modified approach has a better clarification for behavior of concrete in compression. Moreover, the results indicated that these models were more accurate for prediction of concrete behavior with rounded aggregates in comparison to sharped aggregates. UR - https://www.ije.ir/article_125156.html L1 - https://www.ije.ir/article_125156_ff47fc5ef13520421cbcd81134a786b5.pdf ER -