BEHAVIOR OF CONCRETE STRENGTHENED WITH CARBON FIBER REINFORCED POLYMER LAMINATE AT HIGH TEMPERATURE

Abstract

In this paper the effect of high temperature on plain concrete strengthened with Carbon Fiber Reinforced Polymer (CFRP) sheets and behavior of concrete strengthened after heating were studied for flexure and compression properties. For this purpose a total of 44 prismatic specimens of 100x100x350 mm dimensions were tested. Results indicate that due to high temperature there is a continuous reduction in flexural strength of concrete strengthened with CFRP sheet. Deflection corresponding to flexural strength also reduced for exposure temperature higher than 350 o C. The effect of finishing CFRP layers with cement mortar for controlling the reduction of flexural and compressive strengths due to high temperature was found to be not important. According to the obtained results , plain concrete damage by high temperature can be repaired using CFRP sheets for compressive strength of about 74% of that of plain concrete , and flexural strength of about 69% of that of strengthened concrete before heating. ‫ﻋﺎﻟ‬ ‫ﺣﺮﺍﺭﺓ‬ ‫ﺍﱃ‬ ‫ﺍﳌﻌﺮﺿﺔ‬ ‫ﺍﻟﻜﺎﺭﺑﻮﻥ‬ ‫ﺑﺼﻔﺎﺋﺢ‬ ‫ﺍﳌﻘﻮﺍﺓ‬ ‫ﺍﳋﺮﺳﺎﻧﺔ‬ ‫ﺳﻠﻮﻙ‬ ‫ﻴ‬ ‫ﺔ‬ ‫ﺩ‬. ‫ﳏﻤﺪ‬ ‫ﻋﺒﺪﺍﻟﻘﺎﺩﺭ‬ ‫ﺍﺯﺍﺩ‬ ‫ﺳﻠ‬ ‫ﻋﺒﺪﺍﳉﻠﻴﻞ‬ ‫ﻴ‬ ‫ﺍﲪﺪ‬ ‫ﻤﺎﻥ‬ ‫ﺍﳍﻨﺪﺳﺔ‬ ‫ﻛﻠﻴﺔ‬ / ‫ﺩﻫﻮﻙ‬ ‫ﺟﺎﻣﻌﺔ‬ ‫ﺍﳍﻨﺪﺳﺔ‬ ‫ﻛﻠﻴﺔ‬ / ‫ﺩﻫﻮﻙ‬ ‫ﺟﺎﻣﻌﺔ‬ ‫ﺍﳋﻼﺻﺔ‬ ‫ﰎ‬ ‫ﺍﳊﺎﱄ‬ ‫ﺍﻟﺒﺤﺚ‬ ‫ﰲ‬ ‫ﺍﳌﻘﻮ‬ ‫ﻟﻠﺨﺮﺳﺎﻧﺔ‬ ‫ﻭﺍﻻﻧﻀﻐﺎﻁ‬ ‫ﺍﻻﳓﻨﺎﺀ‬ ‫ﺧﻮﺍﺹ‬ ‫ﻋﻠﻰ‬ ‫ﺍﻟﻌﺎﻟﻴﺔ‬ ‫ﺍﳊﺮﺍﺭﺓ‬ ‫ﺗﺄﺛﲑ‬ ‫ﺩﺭﺍﺳﺔ‬ ‫ﺍ‬ ‫ﺍﳋﺮﺳﺎﻧﺔ‬ ‫ﻋﻠﻰ‬ ‫ﺍﻟﺘﻘﻮﻳﺔ‬ ‫ﺗﺄﺛﲑ‬ ‫ﻭﺩﺭﺍﺳﺔ‬ ‫ﺍﻟﻜﺎﺭﺑﻮﻥ‬ ‫ﺑﺼﻔﺎﺋﺢ‬ ‫ﺓ‬ ‫ﺍﻟﻌﺎﻟﻴﺔ‬ ‫ﺍﳊﺮﺍﺭﺓ‬ ‫ﺑﺴﺒﺐ‬ ‫ﺍﳌﺘﻀﺮﺭﺓ‬. ‫ﻓﺤﺺ‬ ‫ﻭ‬ ‫ﻴﺌﺔ‬ ‫ﰎ‬ ‫ﺍﻟﻐﺮﺽ‬ ‫ﳍﺬﺍ‬ 44 ‫ﺑﺎﺑﻌﺎﺩ‬ ‫ﻣﻮﺷﻮﺭﻳﺎ‬ ‫ﳕﻮﺫﺟﺎ‬ 100 х 100 х 350 ‫ﻣﻠﻢ‬. ‫ﺑﺄﻥ‬ ‫ﺗﺆﻛﺪ‬ ‫ﺍﳊﺎﺻﻠﺔ‬ ‫ﺍﻟﻨﺘﺎﺋﺞ‬ ‫ﻫﻨ‬ ‫ﺍﳌﻘﻮ‬ ‫ﻟﻠﺨﺮﺳﺎﻧﺔ‬ ‫ﺍﻻﳓﻨﺎﺀ‬ ‫ﻣﻘﺎﻭﻣﺔ‬ ‫ﰲ‬ ‫ﻣﺴﺘﻤﺮ‬ ‫ﻧﻘﺼﺎﻥ‬ ‫ﺎﻙ‬ ‫ﺍ‬ ‫ﺍﳊﺮﺍﺭﺓ‬ ‫ﺩﺭﺟﺔ‬ ‫ﺯﻳﺎﺩﺓ‬ ‫ﻣﻊ‬ ‫ﺍﻟﻜﺎﺭﺑﻮﻥ‬ ‫ﺑﺼﻔﺎﺋﺢ‬ ‫ﺓ‬. ‫ﺍﳌﺼﺎﺣﺐ‬ ‫ﺍﻻﻭﺩ‬ ‫ﳌ‬ ‫ﺑﺴﺒﺐ‬ ‫ﺗﺄﺛﺮ‬ ‫ﺍﻳﻀﺎ‬ ‫ﺍﻻﳓﻨﺎﺀ‬ ‫ﻘﺎﻭﻣﺔ‬ ‫ﻣﻦ‬ ‫ﺍﻗﻞ‬ ‫ﺍﳊﺮﺍﺭﺓ‬ ‫ﻟﺪﺭﺟﺎﺕ‬ ‫ﻗﻠﻴﻠﺔ‬ ‫ﺑﻨﺴﺒﺔ‬ ‫ﻟﻜﻦ‬ ‫ﺍﳊﺮﺍﺭﺓ‬ 350 ‫ﻣﺌﻮﻳﺔ‬ ‫ﺩﺭﺟﺔ‬. ‫ﻣﻘﺎﻭ‬ ‫ﻧﻘﺼﺎﻥ‬ ‫ﻋﻠﻰ‬ ‫ﻟﻠﺴﻴﻄﺮﺓ‬ ‫ﺍﻟﺴﻤﻨﺖ‬ ‫ﻣﻮﻧﺔ‬ ‫ﺑﻮﺍﺳﻄﺔ‬ ‫ﺎﺀ‬‫ﺍﻻ‬ ‫ﺗﺄﺛﲑ‬ ‫ﺍﻻﳓﻨﺎﺀ‬ ‫ﻣﺔ‬ ‫ﻗﻠﻴﻼ‬ ‫ﻛﺎﻥ‬ ‫ﻭﺍﻻﻧﻀﻐﺎﻁ‬. ‫ﺍﳊﺎﺻﻠﺔ‬ ‫ﺍﻟﻨﺘﺎﺋﺞ‬ ‫ﺣﺴﺐ‬ , ‫ﺻﻴﺎﻧﺘﻬ‬ ‫ﳝﻜﻦ‬ ‫ﺍﻟﻌﺎﻟﻴﺔ‬ ‫ﺑﺎﳊﺮﺍﺭﺓ‬ ‫ﺍﳌﺘﻀﺮﺭﺓ‬ ‫ﺍﳋﺮﺳﺎﻧﺔ‬ ‫ﺎ‬ ‫ﻣﻘﺎﻭﻣﺔ‬ ‫ﻋﻠﻰ‬ ‫ﻟﻠﺤﺼﻮﻝ‬ ‫ﺍﻟﻜﺎﺭﺑﻮﻥ‬ ‫ﺍﻟﻴﺎﻑ‬ ‫ﺑﻮﺍﺳﻄﺔ‬ ‫ﺑﻨﺴﺒﺔ‬ ‫ﺍﻧﻀﻐﺎﻁ‬ % 74 ‫ﺑﻨﺴﺒﺔ‬ ‫ﻭ‬ ‫ﺍﻻﺻﻠﻴﺔ‬ ‫ﺍﳌﻘﺎﻭﻣﺔ‬ ‫ﻣﻦ‬ % 69 ‫ﻟﻠﺨﺮﺳﺎﻧﺔ‬ ‫ﺍﻻﳓﻨﺎﺀ‬ ‫ﻣﻘﺎﻭﻣﺔ‬ ‫ﻣﻊ‬ ‫ﻣﻘﺎﺭﻧﺔ‬ ‫ﺍﻻﳓﻨﺎﺀ‬ ‫ﻣﻘﺎﻭﻣﺔ‬ ‫ﻣﻦ‬ ‫ﺍﳌﻘﻮ‬ ‫ﺍ‬ ‫ﺓ‬ ‫ﻗ‬ ‫ﺍﻟﺘﻌﺮﺽ‬ ‫ﺒﻞ‬ .