List of Articles Mahdi Mahdikhani

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  1 - Rheological properties of self-consolidating concrete made by crushed waste tile aggregates
  Mahdi Mahdikhani Fatemeh Safikhani
  In recent decades, the use of self-consolidating concrete has become widespread. Hence, recognizing the various properties of self-consolidating concrete are essential. In this study, several mixture designs have been tested and final mixture design of crushed tile aggr More

  In recent decades, the use of self-consolidating concrete has become widespread. Hence, recognizing the various properties of self-consolidating concrete are essential. In this study, several mixture designs have been tested and final mixture design of crushed tile aggregates which were replaced by 0%, 25 %, 50%, and 100% volume percentage of natural aggregates were conducted. To evaluate fresh properties of SCC, slump flow and rheometer tests were carried out. Results show that the percentage of fine aggregates has a significant impact on the properties of self-consolidating concrete. In addition, the results of rheometer test show by increasing the percentage of recycled aggregates increases yield stress and plastic viscosity, significantly. Manuscript profile
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  2 - Case study of the statistical distribution of the concretes implemented at Qazvin
  Ali Ebrahimi Mahdi Mahdikhani
  Characteristics of produced concrete become changedthrough changingthe characteristics of materials constituting the concrete. These changes include: The quality of cement, the real ration of water to cement: with neglecting the further water within the aggregates or la More

  Characteristics of produced concrete become changedthrough changingthe characteristics of materials constituting the concrete. These changes include: The quality of cement, the real ration of water to cement: with neglecting the further water within the aggregates or lack of that, the consideredratio fluctuates and the characteristics of the aggregate which are related to the following dimensions: quality of aggregate, shape of aggregate and aggregate grading. The calculated strength in the mix design is the mean target strength which is marginally further than the specified strength. This further margin lowers the ration of water to cement in calculations and consequently, for a stable flow, the amount of consumption or alloy of cement in concrete increases. On the other hand, the amount of the margin depends on the following factors: The sensitivity level of the concrete project (with K coefficient) and standard deviation of concrete production. The purpose of defining this laboratory project is to obtain an optimal concrete mix design for different consumptions and consequently comparison of theoretical and workshop results in the mix design, lowering the cement consumption and the costs of concrete productions in batching and increasing or stabling the specified strength of concrete through lowering the level of cement consumed in concrete. In this procedure, concrete is produced through common method that is segregating sand from cement to compare that with the results obtained, and to calculate standard deviation fall, strength margin and cement alloy fall in order to produce concrete which is statistically suitable for the required strength. Manuscript profile
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  3 - Investigating the Effect of natural Pozzolans on Mechanical Properties of Roller Compacted Concrete
  Mohammad Falahnejad Mahdi Mahdikhani
  Roller Compacted Concrete (RCC), is a concrete with zero slump, which is used in damming and road pavement. Roller Compacted Concrete Pavement (RCCP) bear heavy traffic loads and severe weather conditions. This type of concrete is due to its economic and environmental c More

  Roller Compacted Concrete (RCC), is a concrete with zero slump, which is used in damming and road pavement. Roller Compacted Concrete Pavement (RCCP) bear heavy traffic loads and severe weather conditions. This type of concrete is due to its economic and environmental capabilities, including reduced construction and maintenance costs, longer durability and longer lifetime, as well as environmental compatibility. This paper presents the results of laboratory studies on the effect of natural pozzolan (zeolite) on the mechanical properties of RCC specimens. In this study, cement materials of were used The rheological performance test (VeBe) and compressive and tensile strengths at the age of 7, 14 and 28 days and the flexural strength tests at 14 and 28 days were performed on the specimens. The results show that the higher amount of pozzolan reduced concrete efficiency (the time of VeBe increased). In addition, the compressive, tensile and flexural strength of the samples are decreased, significantly. However, reducing resistance does not mean compliance with the requirements of the Code. Manuscript profile
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  4 - The possible use of Sewage Sludge Ash (SSA) in Self-Consolidating Concrete (SCC) for environmental sustainability
  Mohamadreza Khanban Mahdi Mahdikhani
  Nowadays, waste production is increased due to the growth of technology and excessive use of natural resources as well as production of new chemicals, among which the hazardous wastes are no exception of that stabilization and solidification method is one of the hazardo More

  Nowadays, waste production is increased due to the growth of technology and excessive use of natural resources as well as production of new chemicals, among which the hazardous wastes are no exception of that stabilization and solidification method is one of the hazardous waste management methods through which the waste materials are stabilized and confined. High flexibility for various pollutant compounds, ease of use, and being economical for large volumes of waste has led researchers to use this method to treat various wastes. In this research, sludge ash from sewage treatment plantsuses as waste in order to perform the stabilization and solidification process. Nine mix designs with a water to cement ratio of 0.46; and 0, 6, and 10 percent dried sludge residue of the Alborz Industrial City in Qazvin as the replacement of fine aggregate; 0, 2, and 4 percent of silica fume; and cement content of 600 kg/m3are produced. The mini slump flow, mini V-funnel, compressive strength, electrical resistancetests were carried out on the solidified samples to investigate the effect of waste on the performance of the mortar.The results show that the use of this waste as a substitute for fine aggregate could be taken into consideration. Manuscript profile