بهبود ﭘﺎراﻣﺘﺮﻫﺎي ﻣﮑﺎﻧﯿﮑﯽ ﺑﺘﻦ ﺣﺎﺻﻞ از ﺳﯿﻤﺎن ﭘﻮزوﻻﻧﯽ ﺟﻬﺖ اﺳﺘﻔﺎده در ﭘﺮوژهﻫﺎي آﺑﯿﺎري و زﻫﮑﺸﯽ

Improvement of Mechanical Parameters of Concrete Yielded from Pozzolanic Cement for Irrigation and Drainage Projects

اﯾﻦ ﻣﻘﺎﻟﻪ ﺑﻪ ﮐﻤﯽ ﺳﺎزي ﻋﺪم ﻗﻄﻌﯿﺖ ﻧﺎﺷﯽ از ﻣﺪل ﺳﺎزي ﺳﺎزه ﻫﺎي ﻓﻮﻻدي ﺗﻮﺳﻂ ﺗﯿﺮ ﺗﯿﻤﻮﺷﻨﮑﻮ ﻣﯽ ﭘﺮدازد. ﯾﮑﯽ از روش ﻫﺎي ﻣﺮﺳﻮم در ﺗﺤﻠﯿﻞ دﯾﻨﺎﻣﯿﮏ ﺳﺎزه ﻫﺎ، ﻣﺪل ﮐﺮدن ﺳﺎزه ﻫﺎي ﺳﺎﺧﺘﻤﺎﻧﯽ ﺗﻮﺳﻂ ﻣﺪل ﻫﺎي ﺗﯿﺮ ﭘﯿﻮﺳﺘﻪ اﺳﺖ. اﺳﺘﻔﺎده از ﺗﯿﺮ ﺗﯿﻤﻮﺷﻨﮑﻮ، ﺑﻪ ﻋﻨﻮان ﯾﮏ ﮐﻼس از ﻣﺪل ﻫﺎي ﺗﯿﺮ ﭘﯿﻮﺳﺘﻪ، ﺑﻪ ﺟﺎي ﯾﮏ ﻣﺪل اﺟﺰاي ﻣﺤﺪود ﺑﻪ ﺗﺴﺮﯾﻊ ﻣﺤﺎﺳﺒﺎت ﻣﻨﺠﺮ ﻣﯽ ﺷﻮد. اﯾﻦ ﮐﺎﻫﺶ ﻣﺤﺎﺳﺒﺎت، اﻣﮑﺎن ﺷﻨﺎﺳﺎﯾﯽ اﺣﺘﻤﺎﻻﺗﯽ ﺑﺮﺧﻂ ﺳﺎزه ﻫﺎي ﺳﺎﺧﺘﻤﺎﻧﯽ و ﺗﺸﺨﯿﺺ ﺳﺮﯾﻊ ﺧﺮاﺑﯽ در آن ﻫﺎ را ﭘﺲ از ﯾﮏ روﯾﺪاد ﻟﺮزه اي ﻓﺮاﻫﻢ ﻣﯽ ﺳﺎزد. ﻻزﻣﻪ ﺷﻨﺎﺳﺎﯾﯽ ﺳﺎزه ﻫﺎ ﺑﻪ اﯾﻦ روش، ﮐﻤﯽ ﺳﺎزي ﻋﺪم ﻗﻄﻌﯿﺖ ﻧﺎﺷﯽ از ﺗﻘﺮﯾﺐ ﺳﺎزه ﺑﺎ ﯾﮏ ﺗﯿﺮ ﭘﯿﻮﺳﺘﻪ اﺳﺖ ﮐﻪ ﻫﺪف اﺻﻠﯽ اﯾﻦ ﭘﮋوﻫﺶ را ﺗﺸﮑﯿﻞ ﻣﯽ دﻫﺪ. ﺑﺪﯾﻦ ﻣﻨﻈﻮر ﺑﺎ ﺗﻮﺳﻌﻪ ﯾﮏ ﺳﯿﺴﺘﻢ ﺧﻮدﮐﺎر، ﺗﻌﺪاد 1000 ﻣﺪل اﺟﺰاي ﻣﺤﺪود ﺳﺎزه ﺳﺎﺧﺘﻤﺎﻧﯽ ﻃﺮاﺣﯽ ﺷﺪه و ﺗﺤﺖ ﺗﺤﻠﯿﻞ ﻣﻘﺪار وﯾﮋه ﻗﺮار ﻣﯽ ﮔﯿﺮﻧﺪ ﺗﺎ ﺑﺴﺎﻣﺪ و ﺷﮑﻞ ﻣﻮدي ﻃﺒﯿﻌﯽ آن ﻫﺎ ﺗﻌﯿﯿﻦ ﺷﻮد. ﺑﺮاي ﻫﺮ ﺳﺎزه، ﺗﯿﺮ ﺗﯿﻤﻮﺷﻨﮑﻮي ﻣﻌﺎدل آن ﺗﻌﯿﯿﻦ ﻣﯽ ﺷﻮد. ﺳﭙﺲ، ﺧﻄﺎي ﻧﺎﺷﯽ از ارﺿﺎ ﻧﺸﺪن ﻣﻌﺎدﻟﻪ ﻣﺸﺨﺼﻪ ﺗﯿﺮ ﺗﯿﻤﻮﺷﻨﮑﻮ ﺑﻪ ازاي ﺑﺴﺎﻣﺪ و ﺷﮑﻞ ﻣﻮدي ﻧﺎﺷﯽ از ﻣﺪل دﻗﯿﻖ اﺟﺰاي ﻣﺤﺪود ﻣﺤﺎﺳﺒﻪ ﻣﯽ ﺷﻮد. ﺑﺎ ﺗﺤﻠﯿﻞ آﻣﺎريِ اﯾﻦ ﺧﻄﺎﻫﺎ ﺑﺮاي ﺳﯿﺴﺘﻢ ﻫﺎي ﻣﺨﺘﻠﻒ، ﻣﺸﺨﺼﺎت ﺗﻮزﯾﻊ اﺣﺘﻤﺎل ﺧﻄﺎ، از ﺟﻤﻠﻪ ﺷﮑﻞ ﺗﻮزﯾﻊ، ﻣﯿﺎﻧﮕﯿﻦ و اﻧﺤﺮاف ﻣﻌﯿﺎر آن ﺗﻌﯿﯿﻦ ﻣﯽ ﺷﻮد. ﻧﺘﺎﯾﺞ ﻧﺸﺎن ﻣﯽ دﻫﺪ ﮐﻪ ﻣﯿﺰان ﺧﻄﺎ ﺣﺴﺎﺳﯿﺖ اﻧﺪﮐﯽ ﺑﻪ ﻃﻮل، ﻋﺮض و ارﺗﻔﺎع ﺳﺎزه دارد، اﻣﺎ ﺑﻪ ﺳﯿﺴﺘﻢ ﺳﺎزﻫﺎي ﺑﺴﯿﺎر واﺑﺴﺘﻪ اﺳﺖ. ﺑﺮ اﺳﺎس اﯾﻦ ﻧﺘﺎﯾﺞ، اﻧﺤﺮاف ﻣﻌﯿﺎر ﺧﻄﺎ ﺑﺮاي ﺳﺎزه ﻫﺎﯾﯽ ﺑﺎ ﺳﯿﺴﺘﻢ ﻗﺎب ﺧﻤﺸﯽ ﻓﻮﻻدي 3/5 ﺑﺮاﺑﺮ ﮐﻤﺘﺮ از ﺳﺎزه ﻫﺎﯾﯽ ﺑﺎ ﺳﯿﺴﺘﻢ ﻣﻬﺎرﺑﻨﺪي ﻓﻮﻻدي اﺳﺖ. ﺑﻨﺎﺑﺮاﯾﻦ، ﮐﻼس ﻣﺪل ﺗﯿﺮ ﺗﯿﻤﻮﺷﻨﮑﻮ ﺗﻘﺮﯾﺐ ﺑﻬﺘﺮي از ﺳﯿﺴﺘﻢ ﻫﺎي ﻗﺎب ﺧﻤﺸﯽ ﻓﻮﻻدي اراﺋﻪ ﻣﯽ ﮐﻨﺪ.

Among various active parts of construction industry, irrigation and drainage projects (such as dams, spillways and peripheral parts such as canals) are one of the biggest consumers of cement. Various empirical reports show that the concrete made of Ardabil’s pozzolanic cement does not meet the requirement for irrigation and drainage projects in case of mechanical characteristics which signifies the importance of further research in this area. The objective of this study is to investigate the suitability of replacing Ardabil’s pozzolanic cement with type 2 Soufian cement from the viewpoint of compression strenght at irrigation and drainage projecta. This study focuses on experimental methods by performing standard compression strength tests on base and improved speimens. The initial results showed that solely utilization of Ardabil’s pozzolanic cement in structural parts is not feasible and there should be some other approaches to reach this end. In this regard, 4 additive materials were used instead of cement including: stone powder, fined part of sand, silica fume and fly ash. The results indicated that utilization of fly ash increases the compressive strength of the cement in long term application; however, it causes a reduction in compressive strength in short term application. Furthermore, replacemet of silica fume in lower percentages causes a reduction in compression strength; however, higher percentage of silica fume replacement increases compression strength. The finer parts of the sand slightly decreased the compression strength and the replacement of stone powder yields to an increase in long term compression strength.