بررسی و تحلیل اثرات نانو بتن در توسعه پایدار فضاهای شهری (مورد پژوهشی: کلانشهر شیراز)

محورهای موضوعی : فصلنامه علمی و پژوهشی پژوهش و برنامه ریزی شهری

یاسر زارع ¹ , لیلا شهریاری ² , سعید پرهوده ³ , علی کاربخش ⁴

1 - گروه مهندسی عمران، دانشگاه آزاد اسلامی، واحد سیرجان، سیرجان، ایران
2 - استادیار گروه مهندسی عمران، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران
3 - استادیار گروه فیزیک، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران
4 - استادیار گروه مهندسی عمران، واحد سیرجان، دانشگاه آزاد اسلامی، سیرجان، ایران

تاریخ دریافت : 1398/10/25 تاریخ پذیرش : 1398/11/09 تاریخ انتشار : 1398/11/01

کلید واژه: توسعه پایدار شهری, شیراز, فناوری نانو, نانو بتن,

چکیده مقاله :

تاکنون در راستای تحقق توسعه پایدار شهری از سوی متخصصان، برنامه‌ریزان، و سیاست‌گذاران شهری نسخه‌های متعددی پیچیده شده است و این برنامه‌ها در مواردی موفق و در موادی ناکام مانده است. استفاده از فناوری نانو در توسعه پایداری فضاهای شهری، از جمله مواردی است که اکثر صاحب‌نظران روی آن توافق نظر دارند. یکی از مهم‌ترین موارد استفاده از فناوری نانو در فضاهای شهر، فناوری نانو بتن است. علی‌رغم توجه و تأکید محققان بر استفاده از این فناوری در فضاهای شهری، شواهد نشان می‌دهد تاکنون از این فناوری استقبال ضعیفی به عمل آمده است. این پژوهش در راستای توسعه و ترویج استفاده از این فناوری مدرن در فضاهای شهری، با هدف بررسی و تحلیل اثرات نانو بتن در توسعه پایدار کلانشهر شیراز، با در نظر گرفتن نظرات و دیدگاه‌های متخصصان، کارشناسان، محققان و اساتید دانشگاهی که در خصوص موضوع مورد مطالعه دارای تجربه کاری و تخصص علمی بوده‌اند، انجام گرفته است. داده‌های مورد نیاز با استفاده از مطالعات اسنادی و مطالعات پیمایشی جمع‌آوری شده است. نتایج پژوهش نشان می‌دهد از نظر متخصصان، استفاده از فناوری نانو در بتن با عمکلرد متنوع خود در زمینه‌های مختلف از جمله بهبود مقاومت مکانیکی، افزایش دوام و پایداری بتن، کاهش نفوذپذیری، سازگاری با محیط زیست و افزایش مقاومت در برابر سایش و ضربه می‌تواند در توسعه پایدار شهری موثر باشد. نتایج ضریب همبستگی پیرسون نشان داد میان دو متغیر استفاده از فناوری نانو بتن و توسعه پایدار کلانشهر شیراز رابطه آماری معناداری وجود دارد و نتایج رگرسیون خطی (دو متغیره) نیز نشان داد متغیر مستقل نانو بتن توانسته است 698/0 درصد از تغییرات متغیر وابسته (توسعه پایدار فضاهای شهری در کلانشهر شیراز) را تبیین نماید.

چکیده انگلیسی:

 
Abstract
        Many city planners, policymakers and specialists offered a different solution for having a sustainable urban development so far and some of them have been successful to some extent. Using nanotechnology for sustainable urban development is a measure that most experts agree on and nano concrete is one of the most important uses of nanotechnology in this field. Despite the researchers’ focus and emphasis on the use of this technology in urban environments, it has not received much attention. In the spirit of expanding and promoting the use of this modern technology in urban environments and with the goal of analyzing the effects of nano concrete on the sustainable urban development of shiraz metropolis, this study was conducted. The opinions of experts, specialists, professors and other researchers who have enough experience in this field has also been taken into account for this study. The required sources were gathered using survey study and documentary research. Study results show that, according to experts, because of its varied functions in different fields such as improving mechanical resistance, improving concrete’s durability and stability, decreasing permeability, compatibility with the environment and improved resistance against abrasion and impact, the use of nanotechnology in concrete can be effective in sustainable urban development. Pearson’s correlation coefficient results showed that there is a meaningful statistical relationship between the use of nano concrete technology and the sustainable development of Shiraz metropolis. Linear regression results (two variables) showed that the independent variable of nano concrete could explain 0.697% of the changes in the dependent variable (sustainable urban development of Shiraz metropolis).
 
Key words: nanotechnology, nano concrete, sustainable urban development, shiraz.
 
 
Extended Abstract     
Introduction:
         Today, nanotechnology, as a key technology, has provided many opportunities for sustainable development of urban spaces in a variety of areas, including faster, more flexible, more desirable, more sustainable and more cost-effective construction in the world. A review of existing literature and documents shows that nanotechnology and Nano-concrete technology are theoretically effective in the physical, environmental and even social and economic development of urban spaces. The researchers intend to investigate the effects of Nano-concrete on the sustainable development of urban spaces from the perspective of public and private sector experts. To achieve the above-mentioned goal, field studies have been conducted in Shiraz metropolis, which is one of the most prominent urban areas in the country for the development of nanotechnology and Nano-concrete technology. Therefore, according to the findings, the basic question the researchers in the present study are seeking to analyze and examine is as follows: Can Nano-concrete technology directly affect the sustainable development of Shiraz metropolis? And how does it work?
Methodology
        The purpose of the present study is to conduct an applied research the method of which is a hybrid (documentary and survey) study in which quantitative and statistical methods have been used for the analysis. According to the title and purpose of the research, the statistical population includes all specialists in the field of nanotechnology and Nano-concrete working in public and private companies based in Shiraz metropolis as well as academics, with scientific background and work experience, active in the fields of civil engineering, architecture, urban development and urban planning. Due to the lack of information about the number of these individuals, finally 150 people were considered as the statistical sample, which are statistically acceptable numbers for correlational and causal studies. The main instrument of this study for collecting the required information was a questionnaire whose validity and reliability were confirmed by observing the principles of statistics. The instrument is designed in three separate parts. The first part deals with the personal characteristics of the respondents and the second part deals with the experts' opinions on the advantages and disadvantages of using Nano-concrete in various constructions and activities at the urban spaces level; the third part of the questionnaire deals with indicators and variables of sustainable urban development. Overall, the research process was that after evaluating the opinions and views of experts on the advantages and disadvantages of using Nano-concrete in urban areas as well as examining the status of sustainable development indicators in Shiraz metropolis, the effects of using Nano-concrete (as an independent variable) on sustainable urban development (as a dependent variable of research)  was examined. Frequency distribution table, correlation coefficient and linear regression tests were used to analyze the collected data in SPSS software.
Research findings:
      The results of Pearson correlation coefficient showed that the calculated correlation coefficient of 0.698 was significant at the level of error less than 0.01 and indicated high positive correlation between the two variables. In other words, with the increasing use of nanotechnology and Nano-concrete in the urban development process, the level of sustainable metropolitan development improves, and vice versa. Analysis of the effect of Nano-concrete technology (as an independent research variable) on sustainable urban development in Shiraz metropolitan area (as a research dependent variable) using simultaneous linear regression showed that the values ​​of multiple correlation coefficient, coefficient of determination and adjusted coefficient of determination were 0.698, 0.487 and 0.484, respectively, among which the adjusted coefficient reporting was statistically more logical. Therefore, it can be concluded that the independent variable of Nano-concrete was able to explain 48.4% of the dependent variable (sustainable development of urban spaces in Shiraz metropolis).
Conclusion:
     The results showed that the viewpoints of experts and specialists in nanotechnology as well as academic professors specializing in civil, architecture, urban planning and urban development, were significantly positive about the application of Nano-concrete technology in urban spaces. This is due to the physical, economic, environmental benefits of applying this new technology to urban spaces. The results also showed that there was a positive and relatively strong statistical relationship between the application of Nano-concrete technology and sustainable urban development in Shiraz metropolitan area. The regression impact factor of the independent variable on the dependent variable of the study with the value of 0.698 was statistically significant.
This demonstrates that in both theoretical and empirical aspects, Nano-concrete technology can be used as an effective tool in the development of urban spaces. Therefore, according to the results, the use of Nano-concrete technology in the whole process of construction of urban physical facilities and equipment is recommended. It should be noted that with respect to the significant advantages of Nano-concrete technology in the development of urban spaces, evidence suggests that the use of this technology faces several challenges. Poor policy making in the use of Nano-concrete technology, high cost of the process of procurement of these materials, low technical knowledge of the companies active in the field, poor citizen awareness of the benefits of using these materials in the process of construction in urban areas and poor infrastructure requirements, are among the most important challenges and  obstacles to the development of Nano-concrete technology in Shiraz metropolis, that by adopting the measures and executive solutions  to tackle the above- mentioned obstacles, a clear perspective can be imagined for further use of this technology in the study area and other cities of the country.

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