مطالعه آزمایشگاهی تاثیر به‌کارگیری پودر ضایعات سنگ تراورتن در عملکرد آسفالت حفاظتی لایه‌نازک

اﻣﺮوزه، آﺳﻔﺎﻟﺖﻫﺎی ﺣﻔﺎﻇﺘﯽ در ﺗﻌﻤﯿﺮ و ﻧﮕﻬﺪاری روﺳﺎزیﻫﺎ در ﺳﺮاﺳﺮ ﺟﻬﺎن ﺑﻪ ﺷﮑﻞ ﻗﺎﺑﻞ ﭼﺸﻤﮕﯿﺮی رواج ﯾﺎﻓﺘﻪ اﺳﺖ. در ﻋﺼﺮ ﺣﺎﺿﺮ، ﯾﮑﯽ از ﻣﺸﮑﻼت ﺑﺰرگ زﯾﺴﺖﻣﺤﯿﻄﯽ اﯾﺠﺎد ﺷﺪه، ﺗﻮﻟﯿﺪ ﻗﺎﺑﻞ ﺗﻮﺟﻪ ﺿﺎﯾﻌﺎت ﺳﺎﺧﺘﻤﺎﻧﯽ ﻣﯽﺑﺎﺷﺪ. اﺳﺘﻔﺎده از ﺿﺎﯾﻌﺎت ﺳﺎﺧﺘﻤﺎﻧﯽ ﻗﺎﺑﻞ ﺑﺎزﯾﺎﻓﺖ در روﺳﺎزیﻫﺎ ﻣﯽﺗﻮاﻧﺪ ﺑﻪ ﺣﻔﻆ ﻣﻮاد ﺗﺠﺪﯾﺪﻧﺎﭘﺬﯾﺮ و در ﻋﯿﻦ ﺣﺎل ﮐﺎﻫﺶ ﻣﺸﮑﻼت زﯾﺴﺖﻣﺤﯿﻄﯽ ﮐﻤﮏ ﮐﻨﺪ. ﻫﺪف از اﯾﻦ ﭘﮋوﻫﺶ، ﺑﺮرﺳﯽ ﺟﺎﯾﮕﺰﯾﻨﯽ ﭘﻮدر ﺳﻨﮓ ﺗﺮاورﺗﻦ ﺑﺎزﯾﺎﻓﺘﯽ ﺿﺎﯾﻌﺎﺗﯽ )rwtsp( در ﻃﺮح اﺧﺘﻼط آﺳﻔﺎﻟﺖ ﺣﻔﺎﻇﺘﯽ ﻻﯾﻪﻧﺎزک )اﺳﻼری ﺳﯿﻞ( در ﻣﻘﺎﯾﺴﻪ ﺑﺎ ﻓﯿﻠﺮ ﻣﻌﺪﻧﯽ )mf( اﺳﺖ. ﺑﺮای اﯾﻦ ﻣﻨﻈﻮر، آزﻣﺎﯾﺶﻫﺎی ﭼﺴﺒﻨﺪﮔﯽ ﻣﺮﻃﻮب، ﺳﺎﯾﺶ در ﺷﺮاﯾﻂ ﻣﺮﻃﻮب، ﺑﺎرﮔﺬاری ﭼﺮخ- ﺟﺎﺑﻪﺟﺎﯾﯽ و ﺑﺎرﮔﺬاری ﭼﺮخ- ﭼﺴﺒﻨﺪﮔﯽ ﻣﺎﺳﻪ در ﭘﻨﺞ ﺗﺮﮐﯿﺐ ﻣﺨﺘﻠﻒ ﺷﺎﻣﻞ ﺻﻔﺮ، 75 ،50 ،25 و 100 درﺻﺪ ﺑﺮ اﺳﺎس وزن ﮐﻞ ﻓﯿﻠﺮ اﻧﺠﺎم ﺷﺪ و ﺳﭙﺲ ﺟﻬﺖ ﺑﺮرﺳﯽ ﺷﮑﻞ ذرات و آﻧﺎﻟﯿﺰ ﺳﻄﺢ ﻣﻮاد، ﺗﻌﯿﯿﻦ اﺟﺰای ﺗﺸﮑﯿﻞدﻫﻨﺪه، و ﻫﻤﭽﻨﯿﻦ ﺗﻌﯿﯿﻦ ﺳﺎﺧﺘﺎر و ﺷﻨﺎﺳﺎﯾﯽ ﺗﺮﮐﯿﺒﺎت آﻟﯽ، ﭘﯿﻮﻧﺪﻫﺎی ﺷﯿﻤﯿﺎﯾﯽ و ﺷﻨﺎﺳﺎﯾﯽ ﮔﺮوهﻫﺎی ﻋﺎﻣﻠﯽ و ﺳﺎﺧﺘﺎر ﻣﻮﻟﮑﻮﻟﯽ آن از آزﻣﺎﯾﺶﻫﺎی xrf ،fesem-eds و ftir ﺑﻬﺮه ﮔﺮﻓﺘﻪ ﺷﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ ﻣﺨﻠﻮط ﺣﺎوی 100 درﺻﺪ ﻓﯿﻠﺮ ﭘﻮدر ﺳﻨﮓ ﺗﺮاورﺗﻦ ﺑﺎزﯾﺎﻓﺘﯽ ﺿﺎﯾﻌﺎﺗﯽ ﺑﺎ ﻗﯿﺮ ﺑﺎﻗﯿﻤﺎﻧﺪه 9 درﺻﺪ، ﭼﺴﺒﻨﺪﮔﯽ ﻣﺮﻃﻮب، ﺳﺎﯾﺶ، ﺟﺎﺑﻪﺟﺎﯾﯽ ﻋﻤﻮدی و ﺟﺎﻧﺒﯽ را ﺑﻪ ﺗﺮﺗﯿﺐ در ﺣﺪود 27/9 ،23 ،27/3 و 19/5 درﺻﺪ ﺑﻬﺒﻮد داده اﺳﺖ. ﺟﺎﯾﮕﺰﯾﻨﯽ ﻓﯿﻠﺮِ ﭘﻮدر ﺳﻨﮓ ﺗﺮاورﺗﻦ ﺑﺎزﯾﺎﻓﺘﯽ ﺿﺎﯾﻌﺎﺗﯽ، ﺑﻪ دﻟﯿﻞ دارا ﺑﻮدن ﺷﮑﻞﻫﺎی ﻧﺎﻣﻨﻈﻢ و ﺳﻄﻮح ﻧﺎﻫﻤﻮار و ﺧﺸﻦﺗﺮ و درﺻﺪ زﯾﺎد ﮐﻠﺴﯿﻢ اﮐﺴﯿﺪ و ﺳﯿﻠﯿﺲ، ﻣﻮﺟﺐ ﺑﻬﺒﻮد ﻋﻤﻠﮑﺮد آﺳﻔﺎﻟﺖ ﺣﻔﺎﻇﺘﯽ ﻻﯾﻪﻧﺎزک ﻣﯽﺷﻮد.

experimental study of the effect of recycled waste travertine stone powder on the performance of thin-layer surface treatment

today, surface treatments have become extensively popular for pavement maintenance and repair around the globe. a major environmental problem of the present age is the ever-increasing generation of construction wastes (cws). application of recycled cw in pavements can contribute to preservation of non-renewable materials while reducing the environmental problems. the present research seeks to investigate possible usage of recycled waste travertine stone powder (rwtsp) as an alternative to mineral filler (mf) in thin-layer surface treatment mixtures (slurry seal). for this purpose, wet cohesion test, wet abrasion test, loaded wheel – displacement test, and loaded wheel – sand cohesion test were performed on mixtures in which the mf was replaced by the rwtsp at 0, 25, 75, and 100 wt.% (by total weight of filler). then, fesem-eds, xrf, and ftir analyses were performed to check for the particle geometry and surface analysis, chemical composition, identification of organic compounds and their structures, chemical bonds, and recognition of functional groups and their molecular structure. results showed that the mixture containing rwtsp at 100 wt.% with a residual bitumen content of 9% provided for improved wet cohesion, abrasion, and vertical and lateral displacements by about 27.3, 23, 27.9, and 19.5%, respectively. indeed, thanks to irregular particle geometry with uneven and rough surfaces coupled with higher contents of cao and sio2, the rwtsp filler replacement enhances the performance of the thin-layer surface treatment.