بررسی پارامترهای موثر برمقاومت فشاری، مقاومت الکتریکی ویژه و جذب آب بتن متخلخل سبک
محورهای موضوعی : آنالیز سازه - زلزلهشهریار غلامین نوویرسر 1 , مرتضی جمشیدی 2 , رحمت مدندوست 3
1 - گروه مهندسی عمران، واحدچالوس، دانشگاه آزاد اسلامی، چالوس، ایران
2 - گروه عمران دانشگاه آزاد چالوس
3 - دانشکده فنی و مهندسی گروه عمران دانشگاه گیلان
کلید واژه: بتن متخلخل سبک, مقاومت الکتریکی ویژه, مقاومت فشاری, جذب آب ,
چکیده مقاله :
بتن متخلخل نوعی ویژه از بتن سبک با اسلامپ کم یا حتی صفر شناخته می¬شود که از سیمان، درشت دانه، درصد محدودی از ریز دانه (یا فاقد ریزدانه)، افزودنی¬های مختلف شیمیایی و پوزولانی تشکیل شده است. در¬این مقاله ¬از لیکای ¬سازه¬ای ¬با¬ وزن¬حجمی m3¬¬¬kg/ 750¬ و نسبت آب به سیمان ثابت (3/0W / C =) ، ¬برای ساخت بتن متخلخل سبک استفاده شد و ¬اثر ¬نسبتها¬ی مختلف سبکدانه به سیمان ( A/C ) شامل 3 ، 7/2 ، 4/2 ، 1/2 ، 8/1 ، 5/1 ، تخلخل کل ¬و درصدحجمی خمیر سیمان بر روی مقاومت فشاری ، مقاومت الکتریکی ویژه و درصد جذب آب بتن متخلخل سبک درسن 28 روز مورد بررسی قرار گرفت. با افزایش نسبت A/C از 5/1 تا 3¬، حجم خمیر سیمان از 873/30 % به 436/15 % در نمونه¬ها کاهش و تخلخل کل از64/21 % به 08/38 % افزایش یافت که منجر به کاهش مقاومت الکتریکی ویژه از 45/11 به 841/6 ، کاهش مقاومت فشاری از Mpa 27/13 به MPa 37/4 و افزایش جذب آب از 185/11 % به 695/12 % در نمونه‌های بتن متخلخل سبک شد. نتایج این پژوهش بهبود ویژگیهای فیزیکی و افت ویژگیهای مکانیکی و دوام بتن متخلخل سبک حاوی لیکا را نشان دادند.
Pervious concrete is a special type of lightweight concrete with low or even zero slump, which consists of cement, coarse aggregate, a limited percentage of fine aggregate (or no fine aggregate), various chemical and pozzolanic additives. In this article, structural LECA with a volumetric weight of 750 kg/m3 and a fixed water-to-cement ratio (W/C = 0.3) was used to make lightweight pervious concrete and the effect of different ratios of lightweight aggregate to cement (A/C) including 1.5, 1.8, 2.1, 2.4, 2.7, 3, total porosity and volume percentage of cement paste on compressive strength , specific electrical resistance and percentage of water absorption of lightweight pervious concrete aged 28 days were investigated. With the increase of A/C ratio from 1.5 to 3, the volume of cement paste decreased from 30.873% to 15.436% in the samples and the total porosity increased from 21.64% to 38.08%, which led to a decrease Specific electrical resistance decreased from 11.45 to 6.841 , compressive strength decreased from 13.27 MPa to 4.37 MPa, and water absorption increased from 11.185% to 12.695% in lightweight pervious concrete samples. The results of this research showed the improvement of physical properties and the decrease of mechanical properties and durability of lightweight pervious concrete containing LECA.
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