ارزیابی مقاومت فشاری محدود نشده و دوام ماسه کربناته و سیلیکاته بهسازی شده با بایوپلیمر صمغ فارسی و عامل پیوندساز کلرید کلسیم

ﻣﺤﺪودﯾﺖﻫﺎﯾﯽ ﻧﻈﯿﺮ ﺗﻐﯿﯿﺮ اﺳﯿﺪﯾﺘﻪ ﺧﺎک و ﻧﮕﺮاﻧﯽﻫﺎی زﯾﺴﺖﻣﺤﯿﻄﯽ ﻧﺎﺷﯽ از اﺳﺘﻔﺎده از ﻣﻮاد ﺳﻨﺘﯽ ﺗﺜﺒﯿﺖﮐﻨﻨﺪه ﺧﺎک ﻫﻤﭽﻮن ﺳﯿﻤﺎن، ﺑﺮرﺳﯽ اﺳﺘﻔﺎده از ﻣﻮاد دوﺳﺖدار ﻣﺤﯿﻂزﯾﺴﺖ و ارزان، ﺑﺎ ﺧﻄﺮات ﺛﺎﻧﻮﯾﻪ ﮐﻤﺘﺮ، ﻫﻤﭽﻮن ﺑﯿﻮﭘﻠﯿﻤﺮﻫﺎ را ﺗﻮﺟﯿﻪﭘﺬﯾﺮ ﺳﺎﺧﺘﻪ اﺳﺖ. در اﯾﻦ ﻣﻄﺎﻟﻌﻪ، ﺑﻪ ﺑﺮرﺳﯽ اﺛﺮ اﻓﺰودن ﺻﻤﻎ ﻓﺎرﺳﯽ و ﮐﻠﺴﯿﻢ ﮐﻠﺮﯾﺪ ﺑﻪ دو ﺧﺎک ﻣﺎﺳﻪای ﺳﯿﻠﯿﮑﺎﺗﻪ ﻓﯿﺮوزﮐﻮه و ﮐﺮﺑﻨﺎﺗﻪ ﻫﺮﻣﺰ ﭘﺮداﺧﺘﻪ ﺷﺪه اﺳﺖ. ﺑﺪﯾﻦ ﻣﻨﻈﻮر، ﺗﻮﺳﻂ آزﻣﺎﯾﺶ ﻣﻘﺎوﻣﺖ ﻓﺸﺎری ﻣﺤﺪود ﻧﺸﺪه ﭘﺎراﻣﺘﺮﻫﺎی اوﻟﯿﻪ ﻫﻤﭽﻮن درﺻﺪ وزﻧﯽ ﺻﻤﻎ ﻓﺎرﺳﯽ، ﻣﻮﻻرﯾﺘﻪ ﮐﻠﺴﯿﻢ ﮐﻠﺮﯾﺪ ﻣﻮرد ارزﯾﺎﺑﯽ و درﺻﺪﻫﺎی ﺑﻬﯿﻨﻪ ﻣﻮاد اﻓﺰودﻧﯽ ﺷﻨﺎﺳﺎﯾﯽ ﮔﺮدﯾﺪ. ﺳﭙﺲ، ﺗﺄﺛﯿﺮ ﭘﺎراﻣﺘﺮﻫﺎی ﻣﺤﻞ و ﻣﺪت ﮔﯿﺮش و ﭼﺮﺧﻪﻫﺎی ﻣﺘﻮاﻟﯽ ﺧﯿﺲ و ﺧﺸﮏ ﺑﺮ ﻣﻘﺎوﻣﺖ ﻓﺸﺎری و دوام ﻧﻤﻮﻧﻪﻫﺎی ﺑﻬﺴﺎزیﺷﺪه ﺑﻬﯿﻨﻪ ﺻﻮرت ﮔﺮﻓﺖ. ﻧﺘﺎﯾﺞ اﯾﻦ ﭘﮋوﻫﺶ ﻧﺸﺎن داد ﮐﻪ ﻣﻘﺎوﻣﺖ ﻓﺸﺎری ﻣﺎﺳﻪ ﻓﯿﺮوزﮐﻮه و ﻫﺮﻣﺰ ﺑﻬﺴﺎزیﺷﺪه ﺑﺎ درﺻﺪ ﺑﻬﯿﻨﻪ ﺻﻤﻎ ﻓﺎرﺳﯽ )2/5 و 3 درﺻﺪ( ﺑﻪ ﺗﺮﺗﯿﺐ ﺗﺎ 2/75 و 3 ﻣﮕﺎﭘﺎﺳﮑﺎل ﭘﺲ از ﮔﯿﺮش 28 روزه در ﮔﺮﻣﮑﻦ 40 درﺟﻪ اﻓﺰاﯾﺶ ﭘﯿﺪا ﻣﯽﮐﻨﺪ. در ﺷﺮاﯾﻂ ﺧﺸﮏ، ﻣﺎﺳﻪ ﻓﯿﺮوزﮐﻮه و ﻫﺮﻣﺰ ﺑﻬﺴﺎزیﺷﺪه ﺑﺎ ﺻﻤﻎ ﻓﺎرﺳﯽ و ﮐﻠﺴﯿﻢ ﮐﻠﺮﯾﺪ در درﺻﺪ ﺑﻬﯿﻨﻪ )1/5 درﺻﺪ ﺻﻤﻎ و 3 ﻣﻮﻻر ﺑﺮای ﻓﯿﺮوزﮐﻮه و 2/5 درﺻﺪ و 2 ﻣﻮﻻر ﺑﺮای ﻫﺮﻣﺰ(، ﻣﻘﺎوﻣﺖ 28 روزه ﺑﻪ ﺗﺮﺗﯿﺐ 6/2 و5/1 ﻣﮕﺎﭘﺎﺳﮑﺎل ﮐﺴﺐ ﻣﯽﮐﻨﻨﺪ ﮐﻪ ﻧﺴﺒﺖ ﺑﻪ ﻧﻤﻮﻧﻪ ﺑﻬﺴﺎزیﺷﺪه ﺑﺎ ﺻﻤﻎ ﻓﺎرﺳﯽ، 125 درﺻﺪ و 70 درﺻﺪ اﻓﺰاﯾﺶ داﺷﺘﻪ اﺳﺖ. ﺻﻤﻎ ﻓﺎرﺳﯽ دوام ﻗﺎﺑﻞ ﻗﺒﻮﻟﯽ در ﺑﺮاﺑﺮ ﭼﺮﺧﻪﻫﺎی ﻣﺘﻮاﻟﯽ ﺧﯿﺲ و ﺧﺸﮏ از ﺧﻮد ﻧﺸﺎن داد. ﺑﻪﻃﻮری ﮐﻪ ﻣﻘﺎوﻣﺖ ﻓﺸﺎری ﺗﮏﻣﺤﻮری ﺧﺸﮏ و ﺧﯿﺲ )ﭘﺲ از ﻏﺮﻗﺎب ﺷﺪن در آب( ﻣﺎﺳﻪ ﻓﯿﺮوزﮐﻮه و ﻫﺮﻣﺰ ﺑﻬﺴﺎزیﺷﺪه ﺑﺎ ﺻﻤﻎ ﻓﺎرﺳﯽ، اﺑﺘﺪا ﺑﻪ ﺗﺮﺗﯿﺐ 2200، 2250 ،200 و 240 ﮐﯿﻠﻮﭘﺎﺳﮑﺎل ﺑﻮده ﮐﻪ ﭘﺲ از 10 ﭼﺮﺧﻪ ﻣﺘﻮاﻟﯽ ﺧﯿﺲ و ﺧﺸﮏ ﺑﻪﺗﺮﺗﯿﺐ ﺑﻪ ﻣﻘﺎدﯾﺮ 750، 600 ،110 و 80 ﮐﯿﻠﻮﭘﺎﺳﮑﺎل ﻣﯿﻞ ﮐﺮده و اﯾﻦ ﻣﻘﺎوﻣﺖ را در ﭼﺮﺧﻪﻫﺎی ﺑﻌﺪی ﺣﻔﻆ ﺧﻮاﻫﺪ ﮐﺮد.

evaluation of unconfined compressive strength and durability of carbonate and silicate sands treated with persian gum biopolymer and calcium chloride binding agent

the constraints such as altering soil acidity and environmental concerns stemming from the use of traditional soil stabilizers, like cement, have justified the exploration of environmentally friendly, cost-effective materials with fewer secondary risks, such as biopolymers. this study focuses on examining the effect of adding persian gum and calcium chloride to two types of soils, silicate sand from firouzkooh and carbonate sand from hormuz. for this purpose, initial parameters such as weight percentage of persian gum and molarity of calcium chloride were evaluated through an unconfined compressive strength test, identifying optimal additive percentages. then, the impact of factors such as curing time, curing place, and wetting-drying cycles on the compressive strength and durability of the optimized treated specimens was investigated. results of this research indicate that compressive strength of persian gum-treated firouzkooh and hormuz sands increases up to 2.75 mpa and 3 mpa, respectively, after a 28-day curing period at 40 °c with the optimal persian gum percentage (2.5% and 3%). under dry conditions, persian gum and calcium chloride-treated firouzkooh and hormuz sands at the optimal percentage (1.5% persian gum and 3 molar calcium chloride for firouzkooh sand and 2.5% persian gum and 2 molar calcium chloride for hormuz sand) achieve compressive strengths of 6.2 mpa and 5.1 mpa, respectively, after 28 days, representing a 125% and 70% improvement compared to specimens treated with persian gum. persian gum exhibits acceptable durability against wetting and drying cycles, demonstrating initial dry and wet uniaxial compressive strengths (after immersion in the water) for firouzkooh and hormuz sands treated with persian gum, which were initially 2200 and 200, 2250 and 240 kpa, respectively. after undergoing 10 wetting and drying cycles, these strengths decreased to 750 and 110, 600 and 80 kpa, respectively, and will maintain this resistance in subsequent cycles.