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مشخصات مکانیکی نمونه‌های خاک-سیمان با ساختار پایه ماسه‌ای و دوغاب ساخته‌شده با آب دریا در شرایط محیطی دریایی | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 4، دوره 53، شماره 6، شهریور 1400، صفحه 2277-2296 اصل مقاله (2.08 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2020.17372.6540 | ||
| نویسندگان | ||
| مژگان گراوند1؛ حامد بایسته* 2؛ مهدی شریفی3 | ||
| 1گروه مهندسی عمران دانشگاه قم | ||
| 2مهندسی عمران، دانشگاه قم | ||
| 3استادیار گروه عمران، دانشگاه قم، قم، ایران | ||
| چکیده | ||
| اجرای ستون‌های خاک-سیمان با استفاده از روش‌های اختلاط عمیق و تزریق پرفشار، راهکاری مؤثر جهت مقابله با مشکلات ناشی از مقاومت کم خاک‌های مسئله‌دار ساحلی است. آنچه در اجرایی این ستون‌ها در جامعه مهندسی متداول است، الزام استفاده از آب شیرین در ساخت دوغاب مورد استفاده در این ستون‌ها است. این موضوع هم از منظر محل تأمین و هزینه‌های حمل آن و هم از منظر نبود آب شیرین در بسیاری از نواحی، سبب تحمیل هزینه‌های زیاد به پروژه‌ها و تاخیرات زمانی اجرای آن‌ها می‌گردد. این در حالی است که قبل از گیرش نهایی سیمان، آب شور موجود در محیط اجرای ستون‌ها با آب شیرین موجود در دوغاب حین ساخت آن‌ها در اعماق خاک آمیخته می‌گردد. بررسی امکان‌پذیری استفاده از آب شور در طرح اختلاط این ستون‌ها و ارزیابی رفتار نمونه‌های خاک- سیمان در شرایط دریایی کمتر مورد توجه محققین قرار گرفته است. در این تحقیق سعی شده است عوامل مؤثر در طرح اختلاط دوغاب شامل میزان شوری آب مصرفی، درصد سیمان، نسبت آب به سیمان و زمان عمل‌آوری بر مقاومت فشاری تک‌محوری و کششی ماسه-سیمان بررسی شود. همچنین با استفاده از تصاویر میکروسکوپ الکترونی روبشی (SEM) به صورت ریزساختاری رفتار نمونه‌ها ارزیابی شده است. نتایج نشان می‌دهد در بازه سیمان مصرفی 15 تا 25 درصد وزن ماسه خشک، استفاده از آب شور در ساخت دوغاب، سبب کاهش مقاومت نمونه‌های ماسه-سیمان در شرایط محیطی دریایی نمی‌شود. بازه مقاومت فشاری حاصل‌شده برای نمونه‌های ماسه-سیمان ساخته‌شده با آب دریا حدود (5/1 تا 6) مگاپاسکال و نسبت مقاومت کششی به فشاری این نمونه‌ها در محدوده (15/0 تا 3/0) قرار دارد. | ||
| کلیدواژه‌ها | ||
| خاک-سیمان؛ آب‌شور؛ ماسه ساحلی؛ مقاومت تک‌محوری؛ دوغاب | ||
| موضوعات | ||
| بهسازی خاک ها | ||
| عنوان مقاله [English] | ||
| Effect of seawater in grout on the mechanical behavior of cement stabilized marine sand | ||
| نویسندگان [English] | ||
| mojgan geravand1؛ hamed bayesteh2؛ mahdi sharifi3 | ||
| 1Department of civil engineering, university of Qom | ||
| 2Department of civil engineering, university of Qom | ||
| 3Department of civil engineering, university of Qom | ||
| چکیده [English] | ||
| One of the challenges in the field of geotechnical engineering is the sustainable development of soil improvement methods in marine environments due to severe environmental conditions such as high salinity. Implementation of soil-cement columns using deep mixing method and jet-grouting methods is an effective way to deal with problems caused by low resistance of coastal problematic soils. What is common in the implementation of these columns in the engineering community is the need to use fresh water to make the grout used in these columns. This, both from the point of view of its supply and transportation costs and from the lack of fresh water in many areas, imposes high costs on projects and time delays. However, prior to the final cement retention, the saline water present in the environments of the columns was mixed with the fresh water in the grout as they were built deep in the soil. Investigating the feasibility of using seawater in mixing these columns and evaluating the behavior of soil-cement samples in marine conditions has received little attention. In this study, it has been attempted to investigate the effective factors in the grout mixing scheme, including water salinity, cement percentage, water-cement ratio and processing time on uniaxial compressive strength and sand-cement tensile strength. SEM images were also microstructurally evaluated for sample behavior. The results show that in the 15% to 25% cement content, the use of seawater in grout production does not decrease the strength of sand-cement samples in the marine environment. The obtained compressive strength range for sand-cement samples made with seawater is approximately (1.5 to 6) MPa and the tensile to compressive strength ratio of these samples is in the range (0.15 to 0.3). | ||
| کلیدواژه‌ها [English] | ||
| Soilcrete, Seawater, Marine sand, UCS, Grout | ||
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| مراجع | ||
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