بررسی آزمایشگاهی تأثیر نوع آجر و ملات بر مشخصات مکانیکی منشورهای بنایی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 گروه زلزله - دانشکده مهندسی عمران و محیط زیست - دانشگاه صنعتی شیراز - شیراز - ایران

2 دانشکده مهندسی عمران - دانشگاه صنعتی شیراز - شیراز - ایران

3 گروه مهندسی زلزله - دانشکده مهندسی عمران و محیط زیست - دانشگاه صنعتی شیراز - شیراز - ایران

چکیده

آجر و ملات دو مصالح اصلی و تأثیرگذار بر رفتار سازه‌های بنایی هستند. امروزه، آجرهای مختلفی ازنظر جنس، هندسه و مقاومت و ملات‌ها با مشخصات مقاومتی متفاوت در ساخت‌وساز مورداستفاده قرار می‌گیرند که تنوع موجود در انتخاب نوع آجر و عیار ملات می‌تواند مهندسان را در انتخاب مناسب این دو نوع مصالح دچار سردرگمی کند. در این مطالعه آزمایشگاهی، با استفاده از دو نوع آجر رسی پخته توپر (گری) و رسی سوراخ‌دار (سه گل) مرسوم در ساخت سازه‌های بنایی ایران و دو نوع ملات ماسه سیمانی قوی و ضعیف آزمون‌های استاندارد جهت تعیین و مقایسه مشخصات مکانیکی منشورهای بنایی حاصل صورت گرفت که شامل آزمایش‌های مقاومت فشاری، مقاومت کشش قطری (برشی) و مشخصات چسبندگی اتصال آجر و ملات (مقاومت کشش خمشی و مقاومت برش مستقیم) بود. نتایج حاصل در این مطالعه بررسی شد و بر این اساس مقاومت فشاری منشورهای آجری، مقاومت کشش قطری پانل‌های آجری و مقاومت برش مستقیم منشورهای آجری حساسیت بیشتری به نوع ملات در مقایسه با شکل آجر دارند. همچنین، مشخصات چسبندگی کشش خمشی اتصال آجر و ملات در منشورهای آجری به دلیل وجود سوراخ و امکان قفل شوندگی بین آجر‌ها حساسیت بیشتری به شکل آجر در مقایسه با نوع ملات دارد. درمجموع، بین تمام حالت‌های موردبررسی نمونه‌های بنایی با آجرهای سوراخ‌دار با ملات قوی عملکرد بهتری را داشتند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Study on Effect of Brick and Mortar Types on Mechanical Properties of Masonry Prisms

نویسندگان [English]

  • Seyed Mehdi Dehghan 1
  • Vahid Baneshi 2
  • Sadollah Yousefi Kahnooj 2
  • Mohammad Amir Najafgholipuor 3
1 Civil and Environmental Engineering Department - Shiraz University of Technology - Shiraz - Iran
2 Civil and Environmental Engineering Department - Shiraz University of Technology - Shiraz - Iran
3 Civil and Environmental Engineering Department - Shiraz University of Technology - Iran - Shiraz
چکیده [English]

Brick and mortar are two main materials which have great influence on the behavior of masonry structures. Nowadays, bricks with different shapes, ingredients and strength and mortars with various strength characteristics are used in construction, where this diversity may confuse engineers to choose these two types of materials properly. In this experimental study, using two conventional types of solid and hollow burnt clay bricks in masonry construction of Iran and two types of strong and weak cement-sand mortars, standard tests were performed to determine and to compare the mechanical properties of masonry prisms, including compressive strength and diagonal-tensile (shear) strength and brick-mortar bond properties including flexural tensile and direct shear strengths. The results showed that the compressive strength of brick prism, the diagonal-tensile strength of brick panel, and direct shear strength of brick prism are more sensitive to the type of mortar compared to the shape of brick. Moreover, the flexural tensile bonding properties of brick prisms, due to presence of holes in the bricks and the possible interlocking, is more sensitive to the shape of brick compared to the mortar type. In general, among all the studied cases masonry specimens with hollow bricks and strong mortar have better performance.

کلیدواژه‌ها [English]

  • Brick-mortar bond
  • Burnt clay Brick
  • Masonry wall
  • Mechanical Properties
  • Mode of Failure
  • Strong and Weak Mortar

مراجع

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سابقه مقاله

  • تاریخ دریافت: 21 مهر 1399
  • تاریخ بازنگری: 14 آذر 1399
  • تاریخ پذیرش: 17 بهمن 1399

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