بررسي تأثير الياف ني در ويژگي‌هاي مهندسي بتن ساخته شده از رسوبات رودخانه حرمك (شمال زاهدان) و استفاده از آن در مقاوم‌سازي سازه‌ها در برابر زلزله

Investigating the effect of reed fibers on concrete engineering characteristics made of sediments of Hormak River (North of Zahedan) and its use in Reinforcement of structures against earthquakes

ﻫﺪف ﭘﮋوﻫﺶ ﺣﺎﺿﺮ ﺑﺮرﺳﯽ ﺗﺄﺛﯿﺮ اﻟﯿﺎف ﻧﯽ در وﯾﮋﮔﯽﻫﺎي ﻣﻬﻨﺪﺳﯽ ﺑﺘﻦ ﺳﺎﺧﺘﻪ ﺷﺪه از رﺳﻮﺑﺎت رودﺧﺎﻧﻪ ﺣﺮﻣﮏ )ﺷﻤﺎل زاﻫﺪان( و اﺳﺘﻔﺎده از آن در ﻣﻘﺎومﺳﺎزي ﺳﺎزه ﻫﺎ در ﺑﺮاﺑﺮ زﻟﺰﻟﻪ ﻣﯽﺑﺎﺷﺪ. در اﯾﻦ ﭘﮋوﻫﺶ ﺟﻬﺖ ﺑﺮرﺳﯽ ﺗﺄﺛﯿﺮ اﻟﯿﺎف ﻧﯽ در وﯾﮋﮔﯽﻫﺎي ﻣﻬﻨﺪﺳﯽ ﺑﺘﻦ ﻧﺴﺒﺖ آب ﺑﻪ ﺳﯿﻤﺎن در ﻫﻤﻪ ﻃﺮحﻫﺎ ﺛﺎﺑﺖ و ﺑﺮاﺑﺮ 195 ﺑﻪ 410 اﺳﺖ و آزﻣﺎﯾﺸﺎت ﺑﺮ روي 5 ﻧﻤﻮﻧﻪ ﺣﺎوي اﻟﯿﺎف و ﺑﺪون اﻟﯿﺎف اﻧﺠﺎم ﺷﺪه اﺳﺖ ﮐﻪ ﭘﯿﺶ از ﺗﻌﯿﯿﻦ ﻣﯿﺰان ﺑﻬﯿﻨﻪ ﻫﺮ ﮐﺪام از اﻟﯿﺎف ﻣﺬﮐﻮر ﺟﻬﺖ ﺗﻘﻮﯾﺖ ﺑﺘﻦ، ﻧﺘﯿﺠﻪ آزﻣﺎﯾﺶ ﻫﺎي ﻻزم ﺑﺮ روي ﺑﺘﻦ ﺗﺎزه و ﺳﺨﺖ ﺷﺪه ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺖ. در اﯾﻦ ﺗﺤﻘﯿﻖ ﻋﻼوه ﺑﺮ ﻃﺮح اﺧﺘﻼط اﻟﯿﺎف ﻧﯽ ﺑﺎ ﺑﺘﻦ از روش ﻫﺎي آزﻣﺎﯾﺸﮕﺎﻫﯽ ﻫﻤﭽﻮن ﻣﻘﺎوﻣﺖ ﻓﺸﺎري و ﮐﺸﺸﯽ ﻧﯿﺰ ﺑﺮاي ﺗﺎﯾﯿﺪ ﺻﺤﺖ ﻧﺘﺎﯾﺞ و اﻫﻤﯿﺖ اﻧﺘﺨﺎب ﻣﺼﺎﻟﺢ ﻣﻨﺎﺳﺐ ﺑﺎ ﺻﺮف ﻫﺰﯾﻨﻪ ﻫﺎي اﻧﺪك در ﻣﺪت زﻣﺎن ﮐﻮﺗﺎه ﻗﺒﻞ از اﺟﺮاي ﻃﺮح اﺧﺘﻼط ﺑﺘﻦ ﺑﻬﺮه ﮔﺮﻓﺘﻪ ﺷﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن ﻣﯽدﻫﺪ، اﻓﺰودن اﻟﯿﺎف ﻧﯽ ﺑﻪ ﺑﺘﻦ ﺳﺒﺐ اﻓﺰاﯾﺶ ﻣﻘﺎوﻣﺖ ﻓﺸﺎري در ﻧﻤﻮﻧﻪ ﻫﺎي ﺑﺘﻨﯽ ﺷﺪه اﺳﺖ. ﺑﺎ ﻣﻘﺎﯾﺴﻪ ﻧﺘﺎﯾﺞ اﯾﻦ آزﻣﺎﯾﺶ در ﺑﺘﻦ ﻣﻌﻤﻮﻟﯽ و ﺑﺘﻦﻫﺎي ﺗﻘﻮﯾﺖ ﺷﺪه ﺑﺎ اﻟﯿﺎف، ﻧﺸﺎن داد ﮐﻪ اﯾﻦ اﻓﺰاﯾﺶ ﻣﻘﺎوﻣﺖ در ﺳﻨﯿﻦ 7 ﺗﺎ 28 روز ﺗﻨﻬﺎ در ﻧﻤﻮﻧﻪ ﻫﺎي S2 و S3 اﻓﺰاﯾﺶ ﻧﺸﺎن داده و ﻣﺸﺎﺑﻪ ﻧﻤﻮﻧﻪ ﺑﺘﻦ ﻣﻌﻤﻮﻟﯽ S1 اﺳﺖ، در ﺣﺎﻟﯿﮑﻪ در ﻧﻤﻮﻧﻪ ﻫﺎي S4 و S5 ﮐﻪ ﻧﻤﻮﻧﻪ ﻫﺎي اﻟﯿﺎف ﺳﻪ ردﯾﻔﻪ ﺑﻮدﻧﺪ ﮐﺎﻫﺶ زﯾﺎدي در ﻣﻘﺎوﻣﺖ ﻓﺸﺎري دﯾﺪه ﻣﯽﺷﻮد. اﻓﺰودن اﻟﯿﺎف ﻧﯽ در اﺑﺘﺪا ﺳﺒﺐ اﻓﺰاﯾﺶ ﻣﻘﺎوﻣﺖﻫﺎي ﻓﺸﺎري و ﮐﺸﺸﯽ ﻣﯽﺷﻮد وﻟﯽ ﭘﺲ از ﮔﺬﺷﺖ ﻣﺪت زﻣﺎن ﺑﺎﻋﺚ ﮐﺎﻫﺶ اﯾﻦ ﻣﻘﺎوﻣﺖﻫﺎ ﻣﯽﺷﻮد.

The purpose of this study is to investigating the effect of reed fibers on concrete engineering characteristics made of sediments of Hormak River(North of Zahedan)and its use in Reinforcement of structures against earthquakes.In this study, in order to investigate the effect of reed fibers on the engineering properties of concrete, the ratio of water to cement in all designs is constant and equal to 195 to 410 and experiments have been performed on 5 samples containing fibers and without fibers, before determining the optimal amount of each From the mentioned fibers to strengthen the concrete, the results of the necessary tests on fresh and hardened concrete were examined. In this study, in addition to mixing straw fibers with concrete,laboratory methods such as Compressive and tensile strength were used to confirm the accuracy of the results and the importance of selecting suitable materials at low cost in a short time before the concrete mixing project. The results show that the addition of straw fibers to concrete has increased the compressive strength in concrete samplesComparing the results of this test in ordinary concrete and fiber reinforced concrete, showed that this increase in strength at the ages of 7 to 28 days has increased only in samples S2 and S3 and is Similar to the typical concrete example isS1, While in S4 and S5 samples, which were samples of three-row fibers,there is a large decrease in compressive strength.Adding straw fibers initially increases the compressive and tensile strengths, but over time reduces these resistances.