سیدمرتضی مرندی

[ 1 ] - اعتبارسنجی آزمایش‌های واگرایی در خاک‌های با خواص خمیری و پتانسیل واگرایی کم (مطالعه موردی بخشی از مناطق ایران)

خاک­های واگرا بخش­های وسیعی از سطح زمین را به خود اختصاص داده و یکی از عوامل مهم در گسیختگی در شالوده­های سطحی و عمیق و نیز خرابی در دیگر سازه­های عمرانی همچون سدهای خاکی می­باشند. بخش قابل توجهی از این نوع خاک­ها دارای خواص خمیری و پتانسیل واگرایی کم هستند. تحقیقات گسترده­ای در خصوص شناخت و تعیین میزان واگرایی خاک­ها انجام شده، اما تاکنون اتفاق نظر کلی و جامع در خصوص معیارهای ارزیابی آزمایش­ها...

[ 2 ] - Performance Improvement of Porous Asphalt Mixtures using Crumb Rubber and Steel Slag Powder

In recent decades, porous asphalt has been extended for surface drainage in various regions throughout the world. The permeability of porous asphalt has an important role in the performance of asphalt pavements in the rainy weather. The most remarkable problem related to the porous asphalt is its short service time. Considerable efforts have been made to enhance the mechanical properties of por...

[ 3 ] - Engineering Properties of SMA Mixtures/Polymer/RGP Blends

In this research, the efficiency of Recycled Glass Powder (RGP) is evaluated for improvement of polymer-modified bitumen and asphalt mixture performance. An extensive laboratory programm was undertaken for polymer-modified bitumen including Crumb Rubber (CR), Styrene Butadiene Styrene (SBS) and Styrene Butadiene Rubber (SBR). Rheological and mechanical proper...

[ 4 ] - تأثیر شرایط مختلف عمل‌آوری بر دوام خاک‌های رسی تثبیت‌شده با آهک (مطالعه‌ی ریز‌ساختاری و درشت‌ساختاری)

خاک­های رسی عموماً در حالت خشک، سختی و مقاومت مناسب دارند. اما در حضور آب، دچار افت سختی و مقاومت زیاد شده، که موجب کاهش ظرفیت باربری و افزایش نشست و تراکم­پذیری خاک می­گردد. در پروژه­های عمرانی، خاک­های رسی، بخصوص رس­های نرم، با استفاده از آهک تثبیت می‏شوند. در پژوهش حاضر، نمونه­های خاک رسی کائولینیت، با 10، 15 و 20 درصد آهک تثبیت و در دمای 27 درجه سلسیوس و رطوبت نسبی 2±98 درصد عمل­آوری...

[ 5 ] - Effects of Partial Substitution of Styrene-butadiene-styrene with Granulated Blast-furnace Slag on the Strength Properties of Porous Asphalt

The present experimental research investigates the feasibility of partial substitution of styrene-butadiene-styrene (SBS) with ground granulated blast-furnace slag (GGBS) for the modification of bitumen and porous asphalt mixtures. The control asphalt mixture and the seven modified porous asphalt mixtures have been analyzed separately and their performance was compared. Modified bitumen and asp...

[ 6 ] - Assessment of Lateral Displacements using Neuro-Fuzzy Group Method of Data Handling Systems

Lateral spreading is one of the most destructive effects of liquefaction. Liquefaction is known as one of the major causes of ground failure related to earthquake. This phenomenon is likely to occur when the rate of earthquake-induced excess pore water pressure buildup exceeds the rate of drainage. Estimation of the hazard of lateral spreading requires characterization of subsurface conditions....

[ 7 ] - Laboratory Studies of the Effect of Recycled Glass Powder Additive on the Properties of Polymer Modified Asphalt Binders

In this paper, the effect of adding recycled glass powder (RGP) as a third component in polymer modified bitumen is studied. RGP and styrene butadiene rubber (SBR) is added to the base bitumen in order to prepare modified binders and mixtures. The initial study is performed to determine physical properties of unmodified, SBR modified and RGP-SBR modified asphalt binders which prove RGP's compat...

[ 8 ] - Parameters Analysis of the Covering Soil of Tunnels Constructed In Liquefiable Soils

Earthquake and its catastrophic failures has been one of the disturbance worry of Civil Engineers. In geotechnical science, liquefaction is one of the most important phenomenons induced by earthquake. A change in pore water pressure follows a change in effective stress, and in a critical state in which pore water pressure equals the total stress in soil particles, soil strength is suddenly lost...

[ 9 ] - Reducing the Forces Caused by Earthquake on Retaining Walls Using Granulated Rubber-Soil Mixture

In recent years, various studies have been undertaken on how to use waste materials in civil engineering projects. Among waste materials, waste rubber has been highlighted to be used for different purposes such as reinforcing of soil and making of reinforced slopes. To investigate the properties of granulated rubber-soil mixture and its application in making of slopes behind retaining walls, so...

[ 10 ] - Laboratory Studies on the Effect of Vertical Gravel Column Drains on Liquefaction Potential

Abstract: In recent years deadly earthquakes in seismic areas have caused special concerns regarding liquefaction phenomenon by researchers and specialists. Excess pore water pressure in loose sediments may cause phenomena such as boiling, shearing strength and dynamic stiffness reduction and lateral movements cause difficulties. Many remedial methods such as soil replacement with proper materi...

[ 11 ] - Two and Three-Dimensional Seepage Analysis of Earth Dams Considering Horizontal Filter Blanket Effects (RESEARCH NOTE)

[ 12 ] - تأثیر میزان نوع و درصد کانی رسی در خواص خاک‌های رسی تثبیت‌شده با آهک

یکی از پارامترهای مهم در نتایج تثبیت خاک‌های رسی، درصد و نوع کانی‌های رسی موجود در خاک است که در روش‌های متداول تثبیت با آهک، به آن توجه کمتری شده است و بنابراین، نتایج روش‌های مذکور مغایرت‌های قابل توجهی با یکدیگر دارند. در همین راستا، در پژوهش حاضر به منظور انجام مطالعات ریزساختاری و درشت‌ساختاری فرایند تثبیت، ترکیب‌های مختلف بنتونیت و کائولینیت که حاوی انواع و درصدهای مختلف کانی‌های رسی هستن...