ارزیابی مقایسه‌ای تاثیرخاکستربادی و میکروسیلیس بر روی روند رشد، مقاومت فشاری و مقاومت الکتریکی بتن‌های در معرض آب‌های ‌کلردار

ﯾﮑﯽ از ﺷﺎﯾﻊﺗﺮﯾﻦ ﺧﻮردﮔﯽﻫﺎ، ﻧﺎﺷﯽ از ﯾﻮنﻫﺎی ﮐﻠﺮاﯾﺪ ﻣﯽﺑﺎﺷﺪ و اﯾﻦ ﯾﻮنﻫﺎ ﻣﯽﺗﻮاﻧﻨﺪ از ﻃﺮﯾﻖ ﺳﻨﮕﺪاﻧﻪﻫﺎی آﻟﻮده و ﻣﻮاد اﻓﺰودﻧﯽ ﯾﺎ ﻧﻔﻮذ از ﻣﻨﺎﺑﻊ ﺧﺎرﺟﯽ ﻣﺎﻧﻨﺪ آبدرﯾﺎ وارد ﺑﺘﻦ ﺷﻮﻧﺪ و اﮔﺮ ﺑﺘﻦ ﺗﺤﺖ ﺗﺎﺛﯿﺮ آن ﻗﺮار ﺑﮕﯿﺮد، ﻋﻼوه ﺑﺮ اﻓﺖ ﺷﺪﯾﺪ دوام و ﺗﻮﺳﻌﻪ ﺧﻮردﮔﯽ، ﺷﺎﻫﺪ ﺗﺄﺛﯿﺮ ﻣﺤﺴﻮس ﺑﺮ روی روﻧﺪرﺷﺪ و ﯾﺎ ﮐﺎﻫﺶ ﻣﻘﺎوﻣﺖ ﺧﻮاﻫﺪ ﺷﺪ. در ﺗﺤﻘﯿﻖ ﺣﺎﺿﺮ ﺑﻪ ﺑﺮرﺳﯽ ارزﯾﺎﺑﯽ ﻣﻘﺎﯾﺴﻪای ﺗﺄﺛﯿﺮ ﻣﻘﺎدﯾﺮﻣﺨﺘﻠﻒ ﺧﺎﮐﺴﺘﺮﺑﺎدی و ﻣﯿﮑﺮوﺳﯿﻠﯿﺲ ﺑﺮ روی دوام ﺑﺘﻦ وروﻧﺪرﺷﺪدوام درﺳﻨﯿﻦ ﻣﺨﺘﻠﻒ ﺑﺎ اﻧﺠﺎم آزﻣﺎﯾﺸﺎت ﻣﻘﺎوﻣﺖ ﻓﺸﺎری و ﻣﻘﺎوﻣﺖاﻟﮑﺘﺮﯾﮑﯽ ﺑﺘﻦﻫﺎی ﺳﺎﺧﺘﻪ ﺷﺪه ﺑﺎ اﻧﻮاع ﻃﺮح اﺧﺘﻼط درﻣﻌﺮض آبﻫﺎیﮐﻠﺮدار ﭘﺮداﺧﺘﻪ ﺷﺪه اﺳﺖ. ﻃﺮحﻫﺎی اﯾﻦ ﻣﻄﺎﻟﻌﻪ ﺑﻪ دو ﺑﺨﺶ ﺑﺘﻦﻫﺎی ﻣﻌﻤﻮﻟﯽ و ﺑﺘﻦﻫﺎی دارای ﻣﺎده ﭘﻮزوﻻﻧﯽ ﺗﻘﺴﯿﻢ ﺷﺪهاﻧﺪ ﮐﻪ ﻃﺮحﻫﺎی اﺧﺘﻼط ﺑﺘﻦﻫﺎ درﻣﺤﯿﻂﮐﻠﺮﯾﺪی در11 ﮔﺮوه اﺻﻠﯽ دﺳﺘﻪﺑﻨﺪی ﺷﺪهاﺳﺖ و ﻫﺮ ﮔﺮوه ﺷﺎﻣﻞ 8 ﻃﺮح ﺑﺎ ﺟﺎﯾﮕﺰﯾﻨﯽ ﭘﻮدرﻫﺎی ﻣﯿﮑﺮوﺳﯿﻠﯿﺲ و ﺧﺎﮐﺴﺘﺮﺑﺎدی ﺑﺎ درﺻﺪﻫﺎی ﻣﺘﻔﺎوت ﺑﻪ ﺟﺎی ﺳﯿﻤﺎن ﺷﺪه و ﻓﻘﻂ ﮔﺮوه اول ﺑﺪون ﻫﯿﭻ ﮔﻮﻧﻪ ﻣﻮاد اﻓﺰودﻧﯽ ﺟﺎﯾﮕﺰﯾﻦ ﺳﯿﻤﺎن، ﺷﺎﻣﻞ ﯾﮏ ﻃﺮح ﺑﻪ ﻋﻨﻮان ﻃﺮح ﻣﺒﻨﺎ ﺷﺪ. ﺑﻨﺎﺑﺮاﯾﻦ 81 ﻃﺮح ﮐﻪ ﻫﺮ ﮐﺪام ﺷﺎﻣﻞ 4 ﻧﻤﻮﻧﻪ ﺑﺮای آزﻣﻮنﻫﺎی ﻣﻘﺎوﻣﺖ ﻓﺸﺎری در ﺳﻨﯿﻦ 28 ،14 ،7 و 42 روزه ﺑﺎ ﺟﻤﻊﮐﻞ 324 ﻃﺮح ﺳﺎﺧﺘﻪ ﺷﺪه و ﺑﺮرﺳﯽ ﺷﺪﻧﺪ. ﻧﺘﺎﯾﺞ ﺗﺤﻘﯿﻖ ﻧﺸﺎن داد در ﻣﺤﯿﻂﮐﻠﺮﯾﺪی، ﺑﺘﻦ ﺑﺎ ﺳﻨﮕﺪاﻧﻪ اﺳﺘﺎﻧﺪاردﮐﻪ ﺑﺎﭘﻮزوﻻنﻫﺎی ﺧﺎﮐﺴﺘﺮﺑﺎدی و ﻣﯿﮑﺮوﺳﯿﻠﯿﺲ ﺗﻘﻮﯾﺖ ﺷﺪه ﻃﺮح اﺧﺘﻼط ﺑﻬﯿﻨﻪای را اراﺋﻪ ﻧﻤﻮدﮐﻪ ﻣﻘﺎوﻣﺖﺑﺎﻻو دوام-ﺧﻮب و ﺑﺎ ﺻﺮف ﻫﺰﯾﻨﻪﮐﻢ، راداﺷﺘﻪ اﺳﺖ. ﺑﻪ ﮔﻮﻧﻪای ﮐﻪ ﺑﯿﺶﺗﺮﯾﻦ وﮐﻢﺗﺮﯾﻦدوام ﺑﺮای ﻧﻤﻮﻧﻪﻫﺎی ﻃﺮح 13از ﮔﺮوه3 ﺑﺎ 10% ﻣﯿﮑﺮوﺳﯿﻠﯿﺲ و ﻃﺮح 33 ازﮔﺮوه 5 ﺑﺎ20% ﺧﺎﮐﺴﺘﺮﺑﺎدی و5% ﻣﯿﮑﺮوﺳﯿﻠﯿﺲ ﺑﻪ ﺗﺮﺗﯿﺐ ﺷﺎﻫﺪ 6% اﻓﺰاﯾﺶ ﻣﻘﺎوﻣﺖ و32% ﮐﺎﻫﺶ ﻣﻘﺎوﻣﺖ ﺑﻮد و ﻣﻘﺎوﻣﺖ-اﻟﮑﺘﺮﯾﮑﯽ ﺑﺎ ﺟﺎﯾﮕﺰﯾﻨﯽ20% ﻣﯿﮑﺮوﺳﯿﻠﯿﺲ در ﺳﻨﯿﻦ90روزه در ﻣﻘﺎﯾﺴﻪ ﺑﺎ ﺳﻨﯿﻦ 28 روزه، 2/46ﺑﺮاﺑﺮ اﻓﺰاﯾﺶ ﯾﺎﻓﺖ.

comparative evaluation of effect of fly ash and microsilica on the development, compressive strength and electrical resistance of concretes exposed chlorinated waters

chloride ions cause the most common corrosion, so chloride ions can enter the concrete through contaminated aggregates and additive materials or infiltration from external sources, such as seawater. if the concrete is exposed to the aforementioned ions, there will be severe loss of durability and expansion of corrosion. in this case, there will be a tangible effect on the development process of resistance reducing the concrete’s strength. therefore, the extant study was conducted to compare the effect of fly ash and micro silica on the development, compressive strength, and electrical resistance of concretes exposed to chlorinated waters. the plans of this study included two types of ordinary concretes and concretes containing pozzolanic material. concrete mixing plans in chloride medium were divided into 11 groups, which included 8 plans with substitution of micro silica and fly ash powders with different percentages in exchange for cement. the first group included no additive material as a cement substitute and included one plan as the base plan. accordingly, 81 plans that each consisted of 4 samples were constructed and examined to test compressive strength in 7, 14, 28, and 42-days ages (n=324 plans). according to the results of laboratory samples in chloride medium, there was an increase in the development process of compressive strength, and electrical resistance of concrete while using concrete with standard aggregates reinforced with micro silica and fly ash by selecting the optimal mixing plan and lower cost. the above mentioned case was cost-effective for project implementation.