مدول برشی کرنش کوچک ماسه های تزریق شده با دوغاب زئولیت-سیمان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه ژئوتکنیک، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی، قزوین، ایران

2 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران

3 گروه شیمی، دانشکده ی علوم پایه، دانشگاه بین المللی امام خمینی، قزوین

چکیده

تولید سیمان یکی از مهمترین منابع انتشار گاز دی‌اکسید‌کربن در جهان است و انرژی زیادی نیز مصرف می‌کند. بنابراین، جایگزین نمودن بخشی از آن با مصالح ارزان‌تر و مطلوب محیط‌زیست از قبیل زئولیت از اهمیت بالایی برخوردار است. مدول برشی کرنش کوچک (G0) خاک پارامتری مهم در بسیاری از زمینه‌های مهندسی ژئوتکنیک می‌باشد. در این تحقیق، یک‌سری آزمایش المان خمشی بر روی نمونه‌های ماسه‌ی تزریق‌شده با دوغاب زئولیت-سیمان انجام شد تا اثر سمانتاسیون بر G0 ماسه‌های تزریق‌شده مورد بررسی قرار گیرد. نتایج نشان داد که G0 نمونه‌های تزریق‌شده با افزایش مقدار جایگزینی سیمان با زئولیت (Z) تا 30% زیاد می‌شود. پس از این مقدار (Z30)، افزایش در میزان زئولیت سبب کاهش G0 می‌شود. همچنین، در همه‌ی نسبت‌های آب به مصالح سیمانی (W/CM) و Z در دوغاب، با افزایش اندازه‌ی ذرات ماسه، G0 کاهش می‌یابد. مقدار G0 متناظر با Z30 در ماسه‌یD11 (کوچک‌ترین ذرات) تزریق‌شده با دوغاب حاوی نسبت آب به مصالح سیمانی 3، 5 و 7 به ترتیب 7/21، 7/16 و 5/12 برابر ماسه‌ی خالص شده است. کمترین G0، در نمونه‌های تزریق‌شده با دوغاب حاوی Z90 و W/CM برابر با 7 مشاهده شده است که این مقدار برای ماسه‌هایD11 ،D1 وD2 به ترتیب 16/2، 2/1 و 19/1 برابر G0 ماسه‌ی متناظر در حالت تثبیت‌نشده‌ است. با جایگزینی 60%-50 سیمان با زئولیت در دوغاب تزریق، کاهش نسبی در G0 نمونه‌های تزریق‌شده با سیمان تنها ایجاد نمی‌شود. بنابراین، از نظر اقتصادی و زیست‌محیطی، جایگزین نمودن این مقدار سیمان با زئولیت حائز اهمیت می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Small Strain Shear Modulus of Sands Grouted with Zeolite-cement Suspension

نویسندگان [English]

  • Afshin Kordnaeij 1
  • Reza Ziaie Moayed 2
  • Majid Soleimani 3
1 Department of civil engineering, Imam Khomeini International University, Qazvin, Iran
2 Civil Engineering Department, Imam Khomeini International University
3 Department of Chemistry, Imam Khomeini International University, Qazvin, Iran
چکیده [English]

Cement production is one of the most important sources of CO2 emission in the world and an energetically demanding process. Therefore, the replacement of a part of it with cheaper and environmentally friendly materials such as zeolite is of great importance. In the present study, a series of bender element tests on loose sandy soils grouted with zeolite and cement was conducted to investigate the effects of cementation on the small strain shear modulus (G0 ) of them. The results showed that the G0 of grouted samples increased with an increase in zeolite content (Z) up to 30% (Z30). After that, a further increase in the amount of zeolite results in a decrease in the G0 . Also, in all Z and W/CM, the G0 decreased with increase in the sand grain size. The G0 corresponding to Z30 for D11 sand (the smallest particles) samples grouted with suspension having W/CM of 3, 5 and 7 is, respectively, 21.7, 16.7 and 12.5 times that of pore (unstabilized) sand. The minimum G0 is observed in samples grouted with Z90 and W/CM of 7, which is 2.16, 1.2 and 1.19 times the G0 of corresponding pore sands for D11, D1 and D2 sands, respectively

کلیدواژه‌ها [English]

  • Cement
  • zeolite
  • Bnder element test
  • Grouting
  • Small strain shear modulus
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