نشریه مهندسی عمران امیرکبیر

نشریه مهندسی عمران امیرکبیر

رفتار تثبیت ماسه با سیمان و زئولیت تحت بارهای ضربه ای

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه مهندسی عمران، دانشگاه صنعتی قم، قم، ایران
چکیده
یکی از راه های مقاوم سازی ماسه تثبیت آن با سیمان و آهک بوده است که با توجه به ایجاد آلودگی های زیست محیطی، عدم مقرون به صرفه بودن، ایجاد مشکلات ساختاری و عدم وجود مقاومت پایدار این مصالح، محققین بر آن هستند که مصالح جایگزین را بیابند. برای این منظور، راه های گوناگونی موضوع تحقیقات بوده است. از جمله این تحقیقات، پژوهش هایی هستند که اثر افزودن گردهای آتشفشانی- معدنی به مصالح خاکی را بررسی می‌کنند. از زیر مجموعه های این گردها، گرد زئولیت است. گرد زئولیت نسبتا ارزان و در دسترس است. تحقیقات پیشین نشان می‌دهد که این گرد، مقاومت دراز مدت ماسه را در برابر بار معمولی افزایش می‌دهد. اما تحقیقی برای بار ضربه ای انجام نشده است. در این تحقیق اثر افزودنی زئولیت بر مقاومت ماسه در برابر بار ضربه‌ای بررسی می‌شود. آزمایشی برای بررسی اثر زئولیت روی مقاومت ضربه ای ماسه طراحی شده است. تعداد 25 نمونه در آزمایشگاه آماده شده و آزمایش روی این نمونه ها انجام شده است. نمونه ها دارای درصدهای سیمان به مقدار 4، 6، 8، 10 درصد وزنی ماسه خشک هستند. سیمان در هر نمونه با درصدی از زئولیت جایگزین شده است. درصدهای جایگزینی برابر 10، 30، 50، 70 و 90 درصد وزنی سیمان است. نتایج آزمایش نشان می‌دهد که مقدار جایگزینی بهینه برای همه‌ی نمونه ها بین 30 تا 50 % است. برای همه‌ی نمونه ها، جایگزینی بیش از 65 % تاثیر معکوس روی مقاومت دارد. برای بیشتر نمونه ها، جایگزینی تا 10 % تاثیر چشمگیری روی مقاومت ندارد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Stabilized Sand with Zeolite under Impact Load

نویسندگان English

Alireza Nasiri
Morteza Jiryaei Sharahi
ali attarzadeh
M.S. student Qom university of technology
چکیده English

Cement production has numerous environmental side effects, and it is desirable to reduce the pollutants during cement production. One way of alleviating cement production pollution is by reducing its consumption. Demand for cement can be reduced by introducing alternative materials with the same benefits but are less detrimental to the environment. A natural substitute for cement in infrastructure civil projects is a pozzolan, which is naturally found and is a side product of some industrial processes. One type of pozzolan that has wide availability in Middle Eastern countries is zeolite. Zeolite has been investigated by previous researchers as a replacement for cement for specific types of civil infrastructure development. However, no previous study has investigated zeolite as a substitute for cement for stabilizing sandy soils under impact loading. The feasibility of replacing a percentage of cement with zeolite for stabilizing the sand soil under impact loads is being assessed. Different percentages of cement are replaced with zeolite, and samples are tested under impact loads. Tests indicate that there is an optimum percentage of replacement at which the soil strength under impact loads shows the greatest increase. The optimal replacement percentage is found to be between 30% to 50%. Any replacement below or above that optimal range would hurt the impact strength of the soil samples. The positive effect at optimum replacement percentages can be attributed to the reaction of Calcium Hydroxide and silicate-aluminum structures. Calcium Hydroxide is generated by cement hydration, and silicate-aluminum structures come from the introduction of zeolite into the mix. dealing with any aspect of engineering from fundamental sciences to applications in engineering systems.

کلیدواژه‌ها English

Sand
Cement
Zeolite
Strength
Impact
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