تأثیر نسبت محلول قلیایی به سرباره بر نفوذپذیری بتن قلیا‌فعال سربارهای

نوع مقاله : پژوهشی

نویسندگان

1 دانشگاه صنعتی اصفهان

2 صنعتی اصفهان

چکیده

در این تحقیق، تأثیر نسبت محلول قلیایی به سرباره بر نفوذپذیری بتن قلیا‌فعال سرباره‌ای با آزمایش‌های مختلف مورد تحلیل و بررسی قرار گرفت. امروزه نقش بتن به‌عنوان پرمصرف‌ترین مصالح ساختمانی، در توسعۀ زیرساخت‌های عمرانی و اقتصادی جوامع امری انکارناپذیر است. یکی از راهکارهای تولید بتنی سازگار با محیط زیست و کاهش اثرات مخرب مرتبط با تولید سیمان پرتلند، استفاده از بتن قلیافعال سرباره‌ای می‌باشد که از طریق فعال‌سازی خاصیت چسبندگی سربارۀ کورۀ بلند در یک محلول قلیایی تولید می‌شود. ازآنجاکه نفوذپذیر بودن بتن در پایایی و دوام آن نقش مؤثری دارد، در این تحقیق با متغیر در‌نظر گرفتن نسبت محلول قلیایی به سرباره، پارامترهای نفوذ یون کلر به‌روش RCPT، عمق نفوذ آب، جذب آب کوتاه‌مدت و نهایی و مقاومت فشاری به‌دست می‌آید. مقادیری که برای نسبت محلول قلیایی به سرباره در‌نظر گرفته شد، 4/0 ، 45/0، 5/0 و 55/0 می‌باشد؛ یک طرح با سیمان پرتلند معمولی به‌عنوان طرح کنترل برای مقایسه و ارزیابی با بتن قلیا‌فعال سرباره‌ای ساخته شد. همچنین بااستفاده از عکس‌برداری با میکروسکوپ الکترونی روبشی (تست SEM) مقایسه‌ای ساختاری بین بتن قلیا‌فعال سرباره‌ای و بتن با سیمان پرتلند معمولی انجام شد. نتایج نشان داد که نسبت محلول قلیایی به سرباره 45/0 و 5/0 برای تولید بتن قلیا‌فعال سرباره‌ای از لحاظ دوام و نفوذپذیری مقادیر بهینه‌ای می‌باشند.

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Alkaline Solution-to-Slag Ratio on Permeability of Alkali Activated Slag Concrete

نویسندگان [English]

  • Kiachehr Behfarnia 1
  • Majid Rostami 2
1 Isfahan University of Technology
2 IUT
چکیده [English]

This study investigated the effect of alkaline solution-to-slag ratio on permeability of Alkali-Activated Slag Concrete (AASC). Concrete, as the most widely used building material, has an undeniably important role in development of economic and civic infrastructure. Alkali activated slag cement is an environmentally friendly alternative to Portland cement, which can be produced by using an alkaline solution to activate the binding effect of the blast furnace slag. Permeability of concrete has a direct impact on its durability, so in this study a series of tests were arranged to examine the effect of alkaline solution-to-slag ratio on water impermeability, chloride permeability, short-term and total water absorption and compressive strength of AASC specimens. In experimental study four concrete mixes with alkaline solution-to-slag ratios of 0.4, 0.45, 0.50, and 0.55 were considered. One mix made by ordinary Portland cement were also considered for comparison of results. In addition, The images taken from samples AASC and Ordinary Portland Cement Concrete (OPCC) by means of scanning electron microscopy (SEM) were used to study the comparison of microstructure. The results showed that the alkaline solution/slag ratios of 0.45 and 0.50 are the optimum values for AASC production from the durability and permeability point of view.

کلیدواژه‌ها [English]

  • Alkali Activated
  • Slag
  • alkaline solution
  • permeability

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